U.S. Department of the Interior U.S. Geological Survey

Estimating the Magnitude of Annual Peak Discharges with Recurrence Intervals between 1.1 and 3.0 Years for Rural, Unregulated Streams in West Virginia

By JEFFREY B. WILEY, JOHN T. ATKINS, JR., and DAWN A. NEWELL

Water-Resources Investigations Report 02-4164

In cooperation with the WEST VIRGINIA DEPARTMENT OF TRANSPORTATION, DIVISION OF HIGHWAYS; WEST VIRGINIA SOIL CONSERVATION AGENCY; and the WEST VIRGINIA GEOLOGICAL AND ECONOMIC SURVEY

Charleston, West Virginia 2002

U.S. DEPARTMENT OF THE INTERIOR GALE A. NORTON, Secretary

U.S. GEOLOGICAL SURVEY Charles G. Groat, Director

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

For additional information write to: Copies of this report can be purchased from: District Chief U.S. Geological Survey U.S. Geological Survey Branch of Information Services 11 Dunbar Street Box 25286 Charleston, WV 25301 Denver, CO 80225-0286

CONTENTS

Abstract ................................................................................................................................................................................. 1Introduction ........................................................................................................................................................................... 1

Description of Study Area........................................................................................................................................... 2Physiographic Provinces ................................................................................................................................... 2Climate .............................................................................................................................................................. 2Background ....................................................................................................................................................... 4

Acknowledgments ....................................................................................................................................................... 5Development of Low-Recurrence-Interval Peak-Discharge Estimating Equations .............................................................. 6

Peak-Discharge Data ................................................................................................................................................... 6Basin-Characteristics Data .......................................................................................................................................... 6Magnitude and Frequency Analysis ............................................................................................................................ 8Data Correlation .......................................................................................................................................................... 10Regional Regression Analysis..................................................................................................................................... 11

Estimating Discharges for Gaged and Ungaged Locations................................................................................................... 13Accuracy of Low-Recurrence-Interval Peak-Discharge Estimating Equations .................................................................... 15Limitations of Low-Recurrence-Interval Peak-Discharge Estimating Equations ................................................................. 17Summary ............................................................................................................................................................................... 17References Cited ................................................................................................................................................................... 18Appendix 1. Fortran Program for Calculating Frequency Factors ........................................................................................ 63Appendix 2. Accuracy of Estimating Equations ................................................................................................................... 67

PLATE (Plate is in pocket)

1. Map showing low-recurrence-interval peak-discharge regions in West Virginia and locations of streamflow-gaging stations.

FIGURES

1, 2. Maps showing 1. Physiographic provinces and Climatic Divide in West Virginia ................................................................... 32. Regional boundaries for the low-recurrence-interval peak-discharge estimating equations for

rural, unregulated streams ............................................................................................................................. 133. Graph showing range of differences for the indicated drainage areas (shaded) of the individual standard

errors of prediction from the average prediction errors ......................................................................................... 16

TABLE

1. Equations and regression statistics determined in the regional regression analysis of peak discharges................. 122. Basin-characteristics data used in the regression analysis to develop low-recurrence-interval

peak-discharge estimating equations for rural, unregulated streams in West Virginia ........................................... 233. Peak-discharge statistics from the frequency analysis of the gaging station systematic and historical

record used to develop low-recurrence-interval peak-discharge estimating equations for rural, unregulated streams .................................................................................................................................................................... 34

4. Magnitude and frequency of peak discharges for gaging stations in West Virginia and surrounding States ......... 44

Contents III

CONVERSION FACTORS AND VERTICAL DATUM

CONVERSION FACTORS

Temperature in degrees Fahrenheit (°F) can be converted to degrees Celsius (°C) as follows:°C = (°F –32) / 1.8

VERTICAL DATUM

Vertical Datum: In this report “sea level” refers to the National Geodetic Vertical Datum of 1929 (NDVD of 1929)—a geodetic datum derived from a general adjustment for the first-order level nets of the United States and Canada, formerly called Sea Level Datum of 1929.

Multiply By To Obtain

acre-foot (acre-ft) 1,233 cubic meters (m3)cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)

cubic foot per second per square mile [(ft3/s)/mi2]

0.01093 cubic meter per second per square kilometer [(m3/s)/km2]

foot (ft) 0.3048 meter (m)inch (in.) 25.4 millimeter (mm)mile (mi) 1.609 kilometer (km)

square mile (mi2) 2.590 square kilometer (km2)

IV Contents

Estimating the Magnitude of Annual Peak Discharges with Recurrence Intervals between 1.1 and 3.0 Years for Rural, Unregulated Streams in West Virginia

By Jeffrey B. Wiley, John T. Atkins, Jr., and Dawn A. Newell

Abstract

Multiple and simple least-squares regression models for the log10-transformed 1.5- and 2-year recurrence intervals of peak discharges with inde-pendent variables describing the basin characteris-tics (log10-transformed and untransformed) for 236 streamflow-gaging stations were evaluated, and the regression residuals were plotted as areal distributions that defined three regions in West Virginia designated as East, North, and South. Regional equations for the 1.1-, 1.2-, 1.3-, 1.4-, 1.5-, 1.6-, 1.7-, 1.8-, 1.9-, 2.0-, 2.5-, and 3-year recurrence intervals of peak discharges were deter-mined by generalized least-squares regression. Log10-transformed drainage area was the most significant independent variable for all regions.

Equations developed in this study are appli-cable only to rural, unregulated streams within the boundaries of West Virginia. The accuracies of estimating equations are quantified by measuring the average prediction error (from 27.4 to 52.4 percent) and equivalent years of record (from 1.1 to 3.4 years).

INTRODUCTION

Engineers commonly use low-recurrence-interval (between 1.1 and 3.0 years) peak discharges as design components for developing stream-restoration plans. Stream restoration is the moving or stabilizing of the stream channel as a result of pre-existing or antici-pated disturbance. Streams may be restored at locations where the stream is not in equilibrium because of natu-ral processes, such as catastrophic flooding and land-slides, that affect stream-channel stability. Determining discharge frequencies at locations where streamflow-gaging stations have been present for more than 10 years can be accomplished by analyzing the stream-flow record. Determining discharge frequencies at stream locations where gaging stations are not present can be more difficult. Generally, discharge frequencies at an ungaged location are estimated from the stream-flow records at nearby gaging stations. This estimating procedure can become time-consuming and expensive. A less expensive method for determining the discharge frequencies at ungaged locations is using regionalized equations. If desirable accuracies are not achievable from regionalized equations, at least cursory estimates are possible.

Introduction 1

The U.S. Geological Survey (USGS), in coopera-tion with the West Virginia Department of Transporta-tion, Division of Highways, the West Virginia Soil Conservation Agency, and the West Virginia Geologi-cal and Economic Survey, developed equations for esti-mating low-recurrence-interval peak discharges for rural, unregulated streams in West Virginia. This report presents peak discharges at gaging stations and equa-tions for estimating the peak discharges at ungaged locations for the 1.1-, 1.2-, 1.3-, 1.4-, 1.5-, 1.6-, 1.7-, 1.8-, 1.9-, 2-, 2.5-, and 3-year recurrence intervals. The statistical methods used in the analyses and the result-ing uncertainties in peak discharges are described to support the reliability of the application of the resulting equations to West Virginia streams. This report uses the same data as Wiley and others (2000), where equations were determined for estimating the 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak discharges.

The equations should not be applied to urban areas with paved surfaces, concrete channels, or cul-verts. The equations should not be applied to streams regulated by dams, or large lakes and ponds. Equations are not applicable to heavily mined areas if excessive runoff is diverted into or outside the basin, retained along strip benches, or retained underground. Equa-tions are not applicable to karst areas if excessive runoff is diverted into, outside, or within the basin through solution channels or other cavities in carbonate (limestone and dolomite) rocks.

Description of Study Area

West Virginia is in the mid-Atlantic region of the eastern United States (fig. 1), and can be differentiated by three physiographic provinces and two climatic regions. The three physiographic provinces are the Appalachian Plateaus, Valley and Ridge, and Blue Ridge. Air masses move across the State such that a line defined in this report as the Climatic Divide can identify two climatic regions.

Physiographic Provinces

Generally, the part of the State west of the Climatic Divide is in the Appalachian Plateaus Province, where elevations decrease northwestward from about 3,000–4,860 ft (Spruce Knob) along the Climatic Divide to about 500–700 ft along the Ohio

River. The part of West Virginia east of the Climatic Divide is in the Valley and Ridge Province, except for the extreme eastern tip of the State, which is in the Blue Ridge Province. Elevations decrease from the Climatic Divide to about 250 ft (at Harpers Ferry) in the eastern panhandle (U.S. Geological Survey, 1990).

The Appalachian Plateaus Province consists of consolidated, mostly noncarbonate sedimentary rocks that have a gentle slope from southeast to northwest near the Climatic Divide and are nearly flat-lying along the Ohio River. The one exception to this rock type is the northeastern area of the Province (west of the Climatic Divide), where the rocks are gently folded and some carbonate rock crops out (Fenneman, 1938). The rocks in the Appalachian Plateaus Province have been eroded by streams to form steep hills and deeply incised valleys in dendritic patterns.

The Valley and Ridge Province in West Virginia consists of consolidated carbonate and noncarbonate sedimentary rocks that are folded sharply and exten-sively faulted (Fenneman, 1938). Northeast-trending valleys and ridges parallel the Climatic Divide in a trellis pattern.

The Blue Ridge Province consists of metamor-phic rocks. The Province has high relief between mountains and wide valleys that parallel the Climatic Divide. The rocks are predominantly metamorphosed sandstone and shale within West Virginia (Fenneman, 1938).

Climate

The climate of West Virginia is primarily conti-nental, with mild summers and cold winters. Major weather systems generally approach from the west and southwest, although polar continental air masses of cold, dry air that approach from the north and north-west are not unusual throughout the State. Air masses from the Atlantic Ocean sometimes affect the area east of the Climatic Divide. Generally, tropical continental masses of hot, dry air from the southwest affect the cli-mate west of the Climatic Divide. Tropical maritime masses of warm, moist air from the Gulf of Mexico affect the climate east of the Climatic Divide. Land-recycled moisture through evaporation from local and-upwind land surfaces, lakes, and reservoirs also affects the climate of the State (U.S. Geological Survey, 1991).

2 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

Figure 1. Physiographic provinces and Climatic Divide in West Virginia.

38o

40o

82o

39o

80o

78o

Modified from Fenneman, 1946,and U.S. Geological Survey, 1991

20

20

40 MILES

40 KILOMETERS

0

0

Harpers Ferry

BLUERIDGE

PROVINCE

VALLEY AND

RIDGEPROVINCE

APPALACHIANPLATEAUSPROVINCE

SpruceKnob

OHIO

RIVER

Climat

ic

Divide

40o

84o

Ohio

Maryland

Pennsylvania

Kentucky

WESTVIRGINIA

Virginia

82o 80o 78o

38o

37o

41o

39o

76o

Introduction 3

Precipitation: Annual precipitation averages 42 in. statewide with about 60 percent received from March through August. July is the wettest month, and the months from September through November are the driest. Annual precipitation in the State generally decreases northwestward from about 50–60 in. along the Climatic Divide to about 40 in. along the Ohio River, and is about 40 in. east of the Climatic Divide. Greater precipitation along and immediately west of the Climatic Divide is a consequence of the higher ele-vations along the Divide and the general movement of weather systems approaching from the west and south-west. Annual snowfall follows the general pattern of annual precipitation, decreasing northwestward from about 36–100 in. along the Climatic Divide to about 20–30 in. along the Ohio River. Annual snowfall is about 24–36 in. east of the Climatic Divide (U.S. Geological Survey, 1991; U.S. Department of Commerce, 1960, 1968).

Background

The low-recurrence-interval peak discharges used as design components for making stream-restoration plans can be related to bankfull discharges. There are various definitions of “bankfull” related to both processes and field indicators, and there are many estimates for the recurrence interval for bankfull dis-charge. Every definition of bankfull can describe a different elevation at each stream cross section (Williams, 1978). Some definitions of bankfull related to processes and field indicators follow.

1. Wolman and Leopold (1957): bankfull is at the elevation of the active floodplain, and is the average elevation of the highest surface of the channel bars;

2. Nixon (1959): bankfull is at the highest elevation of a river that can be contained within the chan-nel without spilling water on the floodplain or washlands;

3. Schumm (1960): bankfull is at the height of the lower limit of perennial vegetation (primarily trees), or is at the height of the low bench;

4. Wolman and Miller (1960): the bankfull discharge represents the upper level of the range of chan-nel-forming flows, which transport the bulk of the available sediment over time;

5. Woodyer (1968): bankfull is at the elevation of the middle bench for rivers with various overflow surfaces;

6. Pickup and Warner (1976): bankfull is at the ele-vation at which the width/depth ratio becomes a minimum;

7. Dunne and Leopold (1978): bankfull stage corre-sponds to the discharge at which channel main-tenance is the most effective, that is, the discharge at which moving sediment, forming or removing bars, forming or changing bends and meanders, and generally doing the work that results in the average morphological char-acteristics of channels. Bankfull discharge is associated with a momentary maximum flow, which on the average has a recurrence interval of 1.5 years;

8. Leopold (1994): bankfull discharge is considered to be the channel-forming or effective dis-charge, with a recurrence interval of about 1.5 years, and occurs on 1 or 2 days each year. Bankfull discharge forms and maintains the channel, and over time, carries the most sedi-ment. Little bedload is moved at discharges less than bankfull. Bankfull stage can be indicated by changes in channel cross-section slopes (particularly at the back of a point bar), by changes in vegetation types, by the highest scour line, or by the top of the bank;

9. Rosgen (1996): bankfull stage originally was used to describe incipient elevation on the bank where flooding begins, and applies primarily to stream types that have an observable flood-plain feature. Often, this stage is associated with the flow that just fills the channel to the top of its banks and at a point where water begins to overflow onto a floodplain. Bankfull stage and discharge serve as consistent mor-phological indices, which can be related to the

4 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

formation, maintenance, and dimensions of the channel under the modern climatic regime. Dimension, pattern, and bed features generally are a function of channel width measured at bankfull stage. Bankfull is synonymous with “ordinary high water,” a term used by the U.S. Army Corp of Engineers, and is expressed as momentary maximum or instantaneous peak flow rather than a mean daily discharge;

10. The Federal Interagency Stream Restoration Working Group (1998): bankfull discharge is that which fills a stable alluvial channel up to the elevation of the active floodplain. The bankfull discharge is important morphologi-cally because it represents the breakpoint between the processes of channel and flood-plain formation. In stable alluvial channels, bankfull discharge corresponds closely with effective discharge and channel-forming discharge. There is no universally accepted def-inition that can be consistently applied, has general application, and integrates the pro-cesses that create the bankfull dimensions of the river, so spell out a clear definition of indicators used to define bankfull for every project;

11. Brunner (1999): bankfull discharge is the funda-mental flow in any river that controls the evolu-tion and stability of the dimension, pattern and profile of the stream. This is the discharge that, over time, transports the most sediment throughout a stream, and is sometimes referred to as the effective discharge or dominant dis-charge. This discharge determines the cross-sectional profile of a stream and could be considered the morphologically forming flow; and,

12. Harman and others (2001): bankfull is at the level corresponding to the top of the channel banks and at the level of the flat, frequently inundated surface adjacent to the channel built under the current hydrologic regime. For example, the

most consistent bankfull indicators in North Carolina are the highest scour line and the back of the point bar (it is rarely the top of the bank or the lowest scour or bench).

The recurrence interval of bankfull discharge can have a wide range of values partially because of the different definitions of bankfull related to processes and field indicators. Some of these values are: 1-to-2-year frequency (Wolman and Leopold, 1957); 97 per-cent of the 1.58-year frequency (Dury, 1973); 1.5-year frequency (Hey, 1975); 4-to-10-year frequency (Pickup and Warner, 1976); 1-year frequency (Richards, 1982); 1.4-to-2.0-year frequency (corresponding to flood-plain levels in northern VA streams; Osterkamp and Hupp, 1984); 1.5-to-1.7-year frequency (from 47 rivers in Ontario, Canada; Annable, 1994); 1.0-to-2.5-year frequency, and 1.5-year frequency is a reasonable aver-age (Leopold, 1994; Dunne and Leopold, 1978); 1.01-to-32-year frequency (Williams, 1978); 1.4-to-1.6-year frequency (North American gaging stations with 10 years of record and related to field-determined bank-full; Rosgen, 1996); 1.1-to-4.8-year frequency, and an average of 2.0-year frequency (from 23 headwater gravel-bed streams in snowmelt-dominated parts of central and northern Idaho; Whiting and others, 1999); and, 1.1-to-1.9-year frequency, and a mean of 1.4-year frequency (for rural North Carolina gaging stations; Harman and others, 2001).

Acknowledgments

The USGS; West Virginia Department of Transportation, Division of Highways; West Virginia Soil Conservation Agency; and West Virginia Geological and Economic Survey would like to recog-nize others that have contributed to the success of this study. The Canaan Valley Institute (CVI) facilitated cooperation for this project through stream-restoration workshops and meetings, and creation of the West Virginia Natural Stream Work Group. The West Virginia Natural Stream Work Group is an association of Federal and State agencies, academic institutions, and others (including private consultants) that share an interest in preserving and restoring stream-channel

Introduction 5

stability and stream habitats in West Virginia. Members of the West Virginia Natural Stream Work Group, par-ticularly the CVI; U.S. Department of Agriculture, Natural Resource Conservation Service; and, the West Virginia Department of Natural Resources contributed to the development of the project objectives.

DEVELOPMENT OF LOW-RECURRENCE-INTERVAL PEAK-DISCHARGE ESTIMATING EQUATIONS

Annual peak-discharge data and basin-characteristics data for streamflow-gaging stations in West Virginia were analyzed to determine the magni-tude of low-recurrence-interval peak discharges. The equations for the 2-year discharges were regionalized by plotting the areal distribution of residuals from application of multiple and simple least-squares regres-sion models. Independent variables described basin characteristics for each station location. Magnitudes for the 2-year discharges at stations operated by surround-ing States (Virginia, Maryland, Pennsylvania, Ohio, and Kentucky) were incorporated into the modeling and regionalization procedure. The low-recurrence-interval peak-discharge estimating equations for all recurrence intervals were computed from a generalized least-squares regression model on the basis of the regions and independent variables determined from the analysis of the multiple and simple least-squares regression models of the 2-year-frequency data.

Peak-Discharge Data

Peak discharges for 160 rural, unregulated West Virginia streamflow-gaging stations with a minimum of 10 years of record through the 1997 water year (the period from October 1 of the previous year through September 30 of the indicated year) were used for this study. The peak data used in this study are identical to those used by Wiley and others (2000), and additional

details about the generation and processing of these data, such as quality assurance and peak estimates, can be found in that report.

Annual peak-discharge data are maintained in the USGS’s “Peak File” database available on the World Wide Web from the USGS NWIS-WEB Data Retrieval at http://waterdata.usgs.gov/. Multiple years of peak data were published in USGS Water-Supply Papers through the 1960 water year. Peak data have been published annually in the “U.S. Geological Survey Water Resources Data - West Virginia” series of reports since the 1961 water year (series title has changed several times since 1961).

Basin-Characteristics Data

Eleven basin characteristics for 160 rural, unreg-ulated West Virginia streamflow-gaging stations with a minimum of 10 years of record through the 1997 water year were used for this study (plate 1). Information for stations operated by surrounding States was acquired to augment West Virginia data. The basin-characteristics data used in this study are identical to those used by Wiley and others (2000), and additional details about the generation and processing of these data, such as quality assurance, can be found in that report.

The U.S. Geological Survey “Streamflow/Basin Characteristics” database generally contains variables that (1) quantify statistical summaries of daily-mean discharges and peak discharges, and (2) describe the basin at and upstream from a gaging station by quanti-fying topographic map features and interpreting clima-tological maps. These are variables that intuitively can be assumed to affect streamflow (Thomas and Benson, 1969). This database is not maintained on an annual basis and is not available on the World Wide Web. Contents from this database for 160 gaging stations in West Virginia and 113 gaging stations from surround-ing States are presented in tables 2, 3, and 4 located at the end of this report.

6 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

Eleven basin characteristics were used to describe the basins at and upstream from West Virginia gaging stations. The following 11 basin characteristics are listed in table 2 and were considered for the correla-tion and regression analyses:

1. Drainage area, in square miles (mi2), deter- mined by tracing basin boundaries on a U.S. Geological Survey 1:24,000-scale topographic map and measuring the enclosed area, or by reading from a report of tabulated drainage areas (Mathes, 1977; Wilson, 1979; Mathes and others, 1982; Preston and Mathes, 1984; Stewart and Mathes, 1995; Wiley and Hunt, 1995; Wiley, 1997);

2. Main-channel slope, in feet per mile (ft/mi), determined from a U.S. Geological Survey 1:24,000- or 1:62,500-scale topographic map as the slope between the points along the main stream channel at 10 and 85 percent of the distance from the gaging station to the basin divide;

3. Stream length, in miles (mi), determined from a U.S. Geological Survey 1:24,000- or 1:62,500-scale topographic map as the length of the main stream channel from the gaging station to the basin divide;

4. Mean basin elevation, in feet above sea level, determined by averaging elevations read from a U.S. Geological Survey 1:24,000- or 1:62,500-scale topographic map at 20 to 80 grid cross-ings selected from the placement of a square grid superimposed on a delineated basin;

5. Forested area, in percent, determined by dividing the number of grid crossings at forests (area shaded with green) shown on a U.S. Geological Survey 1:24,000- or 1:62,500-scale topo-graphic map by the total number of grid cross-ings (20 to 80) selected from a square grid superimposed on a delineated basin, then multiplying by 100;

6. Mean annual precipitation, in inches, deter-mined by visual integration of an isohyetal map published by the U.S. Department of Com-

merce (1960) over the area of a delineated basin (this map was reproduced by Wiley and others, 2000, fig. 3, page 8);

7. Precipitation intensity, in inches per 24 hours occurring on an average of once every 2 years, determined by visual integration of an isohyetal map modified from that published by the U.S. Department of Commerce (1961) over the area of a delineated basin. (This isohyetal map was modified by interpolating isohyets for 2.6, 2.7, 2.8, and 2.9 in., and the modified map was published by Wiley and others, 2000, fig. 4, page 9.);

8. Mean annual snowfall, in inches, determined by visually integrating an isohyetal map published by the U.S. Department of Commerce (1968) over the area of a delineated basin (this map was reproduced by Wiley and others, 2000, fig. 5, page 10);

9. Mean minimum January temperature, in degrees Fahrenheit (°F), determined by visually integrating an isothermal map published by the U.S. Department of Commerce (1960) over the area of a delineated basin (this map was reproduced by Wiley and others, 2000, fig. 6, page 11);

10. Local station slope, in feet per mile (ft/mi), determined by measuring the distance between topographic contour-line crossings along the main channel upstream and downstream from a gaging station located on a U.S. Geological Survey 1:24,000-scale topographic map, and dividing the difference in elevations between the contour lines by that distance; and,

11. Streamflow variability index, determined either (1) as the standard deviation of the log10 trans-formations of the 5-, 15-, 25-, 35-, 45-, 55-, 65-, 75-, 85-, and 95-percent flow durations for gaging stations where daily mean discharges already were computed, or (2) by visual inte-gration of a variability-index boundary map published by Friel and others (1989) over the area of a delineated basin for gaging stations with unknown daily mean discharges.

Development of Low-Recurrence-Interval Peak-Discharge Estimating Equations 7

Basin-characteristics data for stations operated by surrounding States (table 2) were obtained from the most recent U.S. Geological Survey flood-frequency studies in these States (Bisese, 1995; Choquette, 1988; Dillow, 1996; Flippo, 1982; and Koltun and Roberts, 1990), from the USGS “Streamflow/Basin Characteristics” database, and other sources (K.J. Ruhl, U.S. Geological Survey, Louisville, Kentucky, written commun., 1997; J.A. Dillow, U.S. Geological Survey, Baltimore, Maryland, written commun., 1997). Not all selected basin-characteristics data were readily avail-able for stations operated by surrounding States, and these data were not determined for the correlation and regression analyses.

Magnitude and Frequency Analysis

The magnitudes and frequencies of peak dis-charges at 160 streamflow-gaging stations on rural, unregulated streams in West Virginia, for which a minimum of 10 years of record through 1997 was available (pl. 1 in pocket), were determined in accor-dance with the guidelines (Bulletin 17B) established by the Interagency Advisory Committee on Water Data, Water Resources Council (1982). Discharges at stations operated by surrounding States (85 out of an original 113 stations) were determined as representative of dis-charges expected in West Virginia by Wiley and others (2000), and were used to augment the West Virginia data in this study. Additional details about the generating and processing of the data from West Virginia and surrounding States, including discussion of stations omitted from consideration here, can be found in Wiley and others (2000).

Recurrence intervals of peak discharges were determined by fitting the Pearson Type III probability curve to the log10 transformed systematic annual-peak

series for a given gaging station. General skew for the region was obtained from the national skew map pro-vided in Bulletin 17B. General skew for the region was weighted with station skew to adjust the probability curve. Additionally, high-outlier, low-outlier, and his-torical peak assessments were made to adjust the annual-peak series. Mixed populations of annual peaks, such as peaks from floods caused by snowmelt and peaks caused by tropical storms or hurricanes, were not analyzed separately.

The PEAKFQ computer program (Thomas, W.O., Jr., Lumb, A.M., Flynn, K.M., and Kirby, W.H., 1998, User's manual for program PEAKFQ, annual flood-frequency analysis using Bulletin 17B guide-lines, written commun., 89 p.) used by Wiley and others (2000), does not output peak discharges for all the recurrence intervals needed for this study. Sub-routines within PEAKFQ (the HARTIV subroutine with related subroutines and functions, originally developed by Kirby, 1980), however, are used to calcu-late all the peak discharges for the recurrence intervals needed for this study. The identified subroutines within PEAKFQ do not calculate discharge directly, but deter-mine a frequency factor (K-value) that is used to calcu-late the discharge. A short Fortran computer program (listed in appendix 1) was used to calculate all the frequency factors (the Bulletin-17B weighted skew was input into the program for all stations used in this study). The short computer program uses the current versions of computer subroutines contained in a library of USGS water-resources application programs (U.S. Geological Survey, 2001), and the subroutines are iden-tical to those used in PEAKFQ (version 4.0, revised December 1, 2000). The frequency factors are used to determine discharge by computing the antilog of

8 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

discharge from the following equation (Interagency Advisory Committee on Water Data, 1976, equation 1, p. 9–10) given as

Log10 Q = Xmean + KS,

where Xmean is the mean of the log10 of annual peak flows

(Bulletin-17B adjusted), in cubic feet per second = ∑ X/N, where X is the log10 of the annual peak flow, in cubic feet per second; and N is the number of items in the data set;

K is the frequency factor; and S is the standard deviation of the log10 of annual

peak flows (Bulletin-17B adjusted), in cubic feet per second = [∑(X-Xmean)2 / (N-1)]0.5.

The 2-year peak discharges calculated using PEAKFQ for this study at stations 01596000, 01600000, 01632000, 01632900, 01634000, 02014000, 03072000, and 03176500 operated by sur-rounding States were not equal to the published 2-year discharges (Bisese, 1995; Dillow, 1996; Flippo, 1982) or revised 2-year discharges for stations 01596000 and 01600000 (J.A. Dillow, U.S. Geological Survey, written commun., 1997). The inequality of the 2-year discharges for these stations operated by surrounding States is because insufficient information about the sta-tion frequency computations was available from the particular State report or basin-characteristics file to exactly reproduce the 2-year discharge. The published and revised 2-year discharges for these stations oper-ated by surrounding States were accepted because the discharges were less than 6 percent different than the values calculated using PEAKFQ for this study. The accepted 2-year discharges for these stations are identical to those published by Wiley and others (2000).

The 2-year discharge, 3,550 ft3/s, calculated using PEAKFQ for this study at the station South Fork South Branch Potomac River near Brandywine

(01607500) was not equal to the 2-year discharge pub-lished by Wiley and others (2000), 5,550 ft3/s, because of a typographical error in Wiley and others (2000).

Selected statistics from the magnitude and fre-quency analyses for the 160 gaging stations in West Virginia and 82 of the 113 gaging stations operated by surrounding States are listed in table 3 (at the end of this report). The 1.1-, 1.2-, 1.3-, 1.4-, 1.5-, 1.6-, 1.7-, 1.8-, 1.9-, 2-, 2.5-, and 3-year peak discharges for the 160 gaging stations in West Virginia are listed in table 4 (also at the end of this report). Only the 2-year peak discharges for 82 of the 113 gaging stations operated by surrounding States are presented so as not to estab-lish or supersede other values for discharges that may be determined for those locations (all discharges for the 82 stations were used to develop equations applicable to West Virginia).

The randomness of the systematic annual-peak series (excluding historical peaks) was tested statisti-cally to detect a trend by means of Kendall’s test for correlation (Kendall, 1975; Hirsch and others, 1982). The computer program SWSTAT (Surface Water STATistics), version 3.2, dated April 3, 1998 (Lumb and others, 1990; A.M. Lumb, W.O. Thomas, Jr., and K.M. Flynn, “Users manual for SWSTAT, a computer program for interactive computation of surface-water statistics,” written commun., 1995) was used to calcu-late Kendall’s tau and the level of significance (the probability or “p-value”). The hypothesis is that there is no trend for the Kendall’s test for correlation. The hypothesis of no trend is rejected if the hypothesis fails to attain a particular level of significance. The particu-lar level of significance was selected as 0.05 for this study, so a trend is determined for an annual-peak series if the level of significance is less than 0.05. Kendall’s tau and the level of significance were deter-mined for the annual-peak series for 160 gaging sta-tions in West Virginia (table 3). The peak series for 10 gaging stations (6.25 percent of the 160 stations) indi-cated a trend. By chance, 8 stations would be expected to indicate a trend (5 percent of the 160 stations), so there is little difference between the number of stations

Development of Low-Recurrence-Interval Peak-Discharge Estimating Equations 9

analyzed as having a trend and the number of stations expected to show a trend by chance. Thus, no signifi-cance could be determined for the trend indicated at the 10 gages, and all 10 gages were retained for consider-ation in the data-correlation and regional regression analysis.

Data Correlation

The 160 rural, unregulated West Virginia stream-flow-gaging stations having a minimum of 10 years of record through the 1997 water year were reduced to 154 for correlation and regional regression analysis. Data from the following six gaging stations were not used for correlation and regional regression analysis: Elk River at Centralia (03195000) because the peak record for this station was used to lengthen the record for Elk River below Webster Springs (03194700); Twelvepole Creek at Wayne (03207000) because the peak record here was used to lengthen the record for Twelvepole Creek below Wayne (03207020); Tug Fork near Kermit (03214000) because the peak record here was used to lengthen the record for Tug Fork at Kermit (03214500); New River at Caperton (03185500) because the peak record here was used to lengthen the record for New River at Fayette (03186000); Cheat River near Morgantown (03071500) because the peak record for this station was used to lengthen the record for Cheat River near Pisgah (03071000); and Tuscarora Creek above Martinsburg (01617000) because the

station is located in a karst area of the State. Available data for 113 gaging stations operated by surrounding States augmented West Virginia data.

In order to identify correlated values, 11 basin characteristics describing the basin at and upstream from gaging stations (see Basin-Characteristics Data section of this report) were log10 transformed. Trans-formed and untransformed data were evaluated for col-linearity using a Pearson Coefficient correlation matrix. Additionally, a shape factor, defined as the drainage area divided by the squared basin length, was log10 transformed, and then transformed and untrans-formed values were evaluated for collinearity. High correlations (absolute value of Pearson correlation coefficient greater than 0.80) were detected among log10 transformed drainage area, main-channel slope, and stream length. High correlations also were detected among log10 transformed main-channel slope, stream length, and local station slope. Additionally, high cor-relations were detected between the untransformed values of drainage area and main-channel slope, and main-channel slope and local station slope. No high correlations were determined between any log10 trans-formed and any untransformed value. Should a pair of highly correlated values become part of a regression equation in the regional regression analysis, consider-ation will be given to eliminate one of the values from the equation. (No pair of highly correlated values became part of a regression equation.)

10 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

Regional Regression Analysis

Multiple and simple least-squares regression models for the log10-transformed 2-year recurrence-interval discharge with independent variables that describe the basin characteristics (both log10 trans-formed and untransformed values) for each gaging station were evaluated, and residuals were plotted as areal distributions to determine regional boundaries. The final regional regression equations for the 1.1-, 1.2-, 1.3-, 1.4-, 1.5-, 1.6-, 1.7-, 1.8-, 1.9-, 2-, 2.5-, and 3-year peak discharges (table 1) were determined by executing a generalized least-squares regression model (Stedinger and Tasker, 1985; Tasker and Stedinger, 1989) (version 2.5) that used the independent variables determined from application of the multiple least-squares regression model.

Regional regression procedures for the 2-year discharge were completed for the entire data set and three regions (fig. 2) were delineated as East, North, and South. A multiple least-squares regression model for the log10-transformed 2-year discharge that used basin characteristics (both log10 transformed and untransformed values) as the independent variables was evaluated. The most significant independent vari-able was determined as log10-transformed drainage area. Inclusion of additional independent variables did not significantly increase the ability of the model to account for the variation of the dependent variable (R2) and did not decrease the standard error by more than 5

percent. A simple least-squares regression model was evaluated for the log10-transformed 2-year discharge with log10-transformed drainage area as the only inde-pendent variable. Residuals from the simple least-squares regression analysis were plotted by latitude and longitude of the gaging station. The residual plots indi-cated areas of West Virginia with similar magnitudes of residuals. The multiple and simple regression proce-dures were repeated for each group of stations with a similar magnitude of residuals (log10-transformed drainage area was the most significant independent variable in all cases), and plots were analyzed until no additional regional boundaries could be identified. Regional analysis in the East Region indicated that four stations with large drainage areas (greater than 2,000 mi2) leveraged the regression analysis. One of the four stations was in West Virginia, Shenandoah River at Millville (01636500), and the other three sta-tions were in surrounding States (see Wiley and others, 2000, p.15). On the basis of these analyses, three regions were delineated. These three regions are identi-cal to those determined by Wiley and others (2000), for which the 100-year discharges were used in the regional regression procedures.

Regional regression procedures were conducted for the 1.5-year discharge to determine if different regional boundaries would be determined at a lower discharge than the 2-year discharge. The same three regions were delineated, and log10-transformed drain-age area remained the most significant independent variable.

Development of Low-Recurrence-Interval Peak-Discharge Estimating Equations 11

Table 1. Equations and regression statistics determined in the regional regression analysis of peak discharges

[Q(n) is the discharge in cubic feet per second for the (n)-year recurrence interval; A is the drainage area in square miles]

Regressionequation

Standard error of the

model,in percent

Averagestandard errorof sampling,

in percent

Averageprediction

error,in percent

Equivalentyears ofrecord

Number ofstreamflow

stations

Range ofdrainage area, in square miles

East Region

Q(1.1) = 31.7 A 0.834 51.1 10.1 52.4 1.3Q(1.2) = 37.9 A 0.835 47.0 9.5 48.2 1.5Q(1.3) = 42.6 A 0.836 44.7 9.2 45.9 1.7Q(1.4) = 46.5 A 0.837 43.1 8.9 44.2 1.8Q(1.5) = 49.9 A 0.838 41.9 8.9 43.0 1.9

Q(1.6) = 53.0 A 0.838 40.9 8.9 42.0 2.0 74 0.22–1,486Q(1.7) = 55.8 A 0.839 40.2 8.6 41.2 2.0Q(1.8) = 58.4 A 0.839 39.5 8.6 40.5 2.1Q(1.9) = 60.9 A 0.840 38.9 8.6 40.0 2.2Q(2) = 62.6 A 0.842 37.7 8.3 38.8 2.3

Q(2.5) = 72.9 A 0.842 36.8 8.3 37.8 2.4Q(3) = 80.2 A 0.843 35.8 8.3 36.8 2.5

North Region

Q(1.1) = 57.7 A 0.789 30.8 7.6 31.8 2.6Q(1.2) = 73.2 A 0.771 28.8 7.3 29.8 3.0Q(1.3) = 85.3 A 0.759 27.8 7.3 28.8 3.1Q(1.4) = 95.5 A 0.751 27.2 6.9 28.2 3.3Q(1.5) = 105 A 0.744 26.9 6.9 27.9 3.3

Q(1.6) = 113 A 0.738 26.7 6.9 27.7 3.4 62 0.13–1,516Q(1.7) = 120 A 0.733 26.6 6.9 27.6 3.4Q(1.8) = 127 A 0.728 26.5 6.9 27.4 3.4Q(1.9) = 134 A 0.725 26.5 6.9 27.4 3.4Q(2) = 138 A 0.724 27.0 6.9 28.0 3.3

Q(2.5) = 166 A 0.708 26.6 6.9 27.6 3.4Q(3) = 188 A 0.698 26.9 6.9 27.9 3.3

South Region

Q(1.1) = 46.9 A 0.804 47.4 8.0 48.3 1.1Q(1.2) = 56.9 A 0.799 44.0 7.6 44.8 1.3Q(1.3) = 64.4 A 0.795 42.3 7.6 43.1 1.4Q(1.4) = 70.5 A 0.792 41.1 7.6 41.9 1.4Q(1.5) = 75.8 A 0.790 40.3 7.3 41.1 1.5

Q(1.6) = 80.6 A 0.789 39.7 7.3 40.5 1.5 100 0.10–8,371Q(1.7) = 84.8 A 0.787 39.2 7.3 40.0 1.5Q(1.8) = 88.8 A 0.786 38.8 7.3 39.6 1.6Q(1.9) = 92.4 A 0.785 38.5 7.3 39.3 1.6Q(2) = 95.4 A 0.785 38.4 7.3 39.2 1.6

Q(2.5) = 110 A 0.781 37.6 7.3 38.4 1.7Q(3) = 121 A 0.778 37.2 6.9 38.0 1.7

12 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

Figure 2. Regional boundaries for the low-recurrence-interval peak-discharge estimating equations for rural, unregulated streams in West Virginia.

38o

82o

39o

80o

40o

78o

EXPLANATION

REGIONAL BOUNDARY

COUNTY BOUNDARY

20

20

40 MILES

40 KILOMETERS

0

0

Han

coc

k B

roo

ke

Ohio

Marshall

Wetzel

Marion

Taylor

Tyler

RitchieWood

Wirt

Jackson

Mason

Cabell

Wayne

Boone Fayette

Greenbrier

MonroeSummers

Mercer

Raleigh

Wyoming

McDowell

Logan

Mingo

Nicholas Pocahontas

Lincoln

Putnam

Kanawha

ClayWebster

Braxton

Roane

Calhoun GilmerLewis

Upshur

BarbourTucker

Randolph

Pendleton

Hardy

Grant

MineralHampshire

Morgan

Berkeley

Jeffe

rson

HarrisonPleasants

Doddri

dge

Monongalia

Preston

NORTHREGION

SOUTHREGION

EASTREGION

ESTIMATING DISCHARGES FOR GAGED AND UNGAGED LOCATIONS

How discharge estimates are made depends on whether the stream location of interest is at a stream-flow-gaging station, on an ungaged stream, or on the same stream as a nearby gaging station (where “nearby” means that the drainage area for that location is between 50 and 150 percent of the drainage area at the gaged location). The estimating procedure is not applicable on urbanized and regulated streams, and caution should be used if the stream is heavily affected by mining or located in a karst area.

Discharges at a gaging station are read directly from table 4 (the appropriate equation and weighting factors have been applied). No weighted value is pre-sented in table 4 for one of the two stations on the same stream that were combined into a single time-series record. For this case, the station location listed without a weighted value should be analyzed as “on the same stream as a nearby gaging station.” Discharges on the same stream as a nearby gaging station are determined at the ungaged location from the desired regional regression equation and then adjusted by a factor that related differences between the ungaged and gaged locations. No weighted value is presented in table 4 for Tuscarora Creek above Martinsburg (01617000).

Estimating Discharges for Gaged and Ungaged Locations 13

The frequency of the systematic record for Tuscarora Creek (S) should be used directly because the station is located in a karst area of the State. Discharge on an ungaged stream is determined from the desired regression equation for the appropriate region.

At a streamflow-gaging station. A discharge at a gaging station is determined by reading the weighted (W) value directly from table 4. For example, the weighted 2-year discharge at the gaging station Greenbrier River at Alderson (03183500) is given as 34,000 ft3/s. This discharge was calculated by weight-ing (1) the discharge determined from the systematic and historical record (S), on the basis of the guidelines established by the Interagency Advisory Committee on Water Data, Water Resources Council (1976; table 3), and (2) the discharge determined by the appropriate regional (R) regression equation (table 4). The weight-ing technique considered (1) the number of years of peak-discharge record (summation of the number of years of systematic record, the number of historical peaks, and the number of high-outlier peaks from table 3 located at the end of this report), and (2) the number of equivalent years of record (an estimate given in table 1 of the number of systematic years of record needed to calculate discharges with an accuracy equal to that of the regional regression equation). The following equation was used:

Qw = (QsN + QrE) / (N + E),

where Qw is the weighted discharge in cubic feet per

second; Qs is the discharge in cubic feet per second

determined from the systematic and historical record on the basis of the guidelines established by the Water Resources Council;

Qr is the discharge in cubic feet per second determined by the regional regression equation;

N is the number of years of peak-discharge record; and

E is the equivalent years of record.

On an ungaged stream. A discharge on an ungaged stream is determined by applying the desired regional regression equation for the appropriate region (table 1). For example, the 1.5-year discharge for Fishing Creek just downstream from the confluence of North and South Forks of Fishing Creek in Wetzel County (Pine Grove 71/2-minute U.S. Geological Survey topographic map) can be calculated as follows:

1. The stream is located in the North Region as determined from figure 2;

2. The 1.5-year regression equation for the North Region is selected from table 1 as

Q(1.5) = 105 A 0.744,

where Q(1.5) is the 1.5-year discharge in cubic feet

per second, and A is the drainage area in square miles.

3. The drainage area is determined by measuring the area on a topographic map or from the U.S. Geological Survey drainage-area report (Wiley, 1997, page 30) as 113.92 mi2; and

4. The 1.5-year regression equation for the North Region is evaluated as 3,560 ft3/s.

On the same stream as a nearby gaging station. A discharge on the same stream as a nearby gaging station is determined by adjusting the discharge determined from the regional equation by a factor relat-ing (1) drainage areas, and (2) weighted and regional regression discharges (Hannum, 1976; Glatfelter, 1984). For example, the 3-year discharge for a site on Coal River just downstream from the confluence of the Little Coal and Big Coal Rivers in Kanawha County (Alum Creek 71/2-minute U.S. Geological Survey topographic map) can be calculated as follows:

1. The drainage area is determined by measuring the area on a topographic map or by reading from the U.S. Geological Survey drainage-area report (Mathes and others, 1982, page 196) as 830.02 mi2, which is 96 percent (between 50 and 150 percent) of the drainage area given in table 3 (862 mi2) for the gaging station Coal River at Tornado (03200500);

14 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

2. The weighted 3-year discharge for Coal River at Tornado (03200500) is read directly from table 4 as 24,400 ft3/s (see discussion above for cal-culations at a gaging station), and the regional 3-year discharge is read directly from table 4 as 23,300 ft3/s;

3. The 3-year discharge for the Coal River just downstream from the confluence of the Little Coal and Big Coal Rivers is determined from the equation given in table 1 as 22,600 ft3/s (South Region, drainage area of 830.02 mi2: see discussion above for an ungaged stream);

4. The correction factor for the gaged location is determined as 1.047 from the following equation:

Cg = Qw / Qr ,

where Cg is the correction factor for the gaging-

station location; Qw is the weighted frequency discharge in

cubic feet per second read from table 4; and

Qr is the regional regression discharge in cubic feet per second read from table 4;

5. The correction factor for the ungaged location is determined as 1.044 from the following equation:

Cu = Cg - [(2 |Ag - Au|) / Ag] (Cg - 1),

where Cu is the correction factor for the

ungaged location; Cg is the correction factor for the

gaging station location (see previous equation);

Ag is the drainage area in square miles at the gaging station location read from table 2;

Au is the drainage area in square miles at the ungaged location; and

|Ag - Au| is the absolute value of the difference between the drainage area in square miles (mi2) at the gaging station location and the drainage area in square miles (mi2) at the ungaged location;

6. The adjusted 3-year discharge for the Coal River just downstream from the confluence of the Little Coal and Big Coal Rivers is determined as 23,600 ft3/s from the following equation:

Qa = CuQu ,

where Qa is the adjusted discharge in cubic feet

per second; Cu is the correction factor for the

ungaged location (see previous equation); and

Qu is the regional regression discharge at the ungaged location in cubic feet per second.

ACCURACY OF LOW-RECURRENCE-INTERVAL PEAK-DISCHARGE ESTIMATING EQUATIONS

The accuracy of the estimating equations is quantified by measuring the average prediction error and equivalent years of record (Hardison, 1969, 1971). The average prediction error ranged from 27.4 to 52.4 percent, and the equivalent years of record ranged from 1.1 to 3.4. These accuracy measurements are included with the regression statistics summarized in table 1.

Average prediction error. Average prediction error is the square root of the sum of the squared stan-dard error of the model (the portion of the total error due to an imperfect model) and average squared stan-dard error of sampling (the portion of the total error due to estimating model parameters from a sample) in log units. The calculations involved in estimating the average prediction error are explained in Tasker and Stedinger (1989) and in appendix 2 of this report. The average prediction error is within 1.3 percentage points of the standard error of the model for all regression equations presented in table 1. The near equivalence of the average prediction error and the standard error of the model indicate that addition of the average standard error of sampling to the standard error of the model accounts for very little additional unexplained variance of the discharge estimate.

Accuracy of Low-Recurrence-Interval Peak-Discharge Estimating Equations 15

The average prediction error is the square root of the average of individual squared standard errors of prediction. Individual standard errors of prediction for the regression equations can be determined as described in appendix 2 (Koltun and Roberts, 1990, appendix A; and Hodge and Tasker, 1995, p. 37–42). This method was applied to each regression equation shown in table 1 to investigate the variation of the individual standard errors of prediction and to compare the individual standard errors of prediction to the aver-age prediction error. The differences between the indi-vidual standard errors of prediction and the average prediction error were insignificant. Thus, computation of individual standard errors of prediction is not neces-sary when applying the equations.

The variation of the individual standard errors of prediction over the range of drainage areas for the regression equations was compared to the average pre-diction error (fig. 3). The individual standard errors of prediction increase for drainage areas less than and greater than about 100 mi2 (where the individual stan-dard errors are less than 1.0 percentage points less than average prediction error) for all regression equations. The maximum individual standard errors of prediction for the maximum drainage areas are within 0.5 percent-

age points of the average standard error of prediction for all regression equations. The maximum individual standard errors of prediction for the minimum drainage areas are 5.4 percentage points greater than the average prediction error for all regression equations. The indi-vidual standard errors of prediction are less than 0.8 percentage points less than the average prediction error for a drainage area of 10 mi2 for all regression equa-tions. In summary, the individual standard errors of prediction are within 1.0 percentage point of the aver-age prediction error for drainage areas greater than 10 mi2, and the individual standard errors of prediction increase to a maximum of 2.7 percentage points greater than the average standard error of prediction at the minimum drainage areas.

Equivalent years of record. Equivalent years of record (table 1) is an estimate of the number of system-atic years of record needed to calculate discharges with an accuracy equal to that of the regional regression equation. Equivalent years of record is a weighting factor that is applied when determining discharges at gaging stations (see Estimating Procedure section of this report).

16 Est

Figure 3. Range of differences for the indicated drainage areas (shaded) of the individual standard errors of prediction from the average prediction errors; graph represents all regional regression equations.

10 100-6

6

-5

-4

-3

-2

-1

0

1

2

3

4

5

DRAINAGE AREA, IN SQUARE MILES

DIF

FE

RE

NC

ES

OF

TH

E IN

DIV

IDU

AL

ST

AN

DA

RD

ER

RO

RS

OF

PR

ED

ICT

ION

FR

OM

T

HE

AV

ER

AG

E P

RE

DIC

TIO

N E

RR

OR

S, I

N

PE

RC

EN

TA

GE

PO

INT

S

RegionalMinimum

RegionalMaximum

Not to scale

imating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

LIMITATIONS OF LOW- RECURRENCE-INTERVAL PEAK-DISCHARGE ESTIMATING EQUATIONS

Equations developed in this study are only appli-cable to rural, unregulated streams within the bound-aries of West Virginia. The equations should not be applied to urban areas with paved surfaces, concrete channels, culverts, and other control structures. The equations should not be applied to streams regulated by dams, or large lakes and ponds. Equations are not applicable to heavily mined areas if excessive runoff is diverted into or outside the basin, retained along strip benches, or retained underground. Equations are not applicable to karst areas if excessive runoff is diverted into, outside, or within the basin through solution channels or other cavities in carbonate (lime-stone and dolomite) rocks. Jones (1997) describes the locations of karst areas in eastern counties of West Virginia including Monongalia, Preston, Barbour, Tucker, Grant, Mineral, Hardy, Hampshire, Morgan, Berkeley, Jefferson, Randolph, Pendleton, Pocahontas, Greenbrier, Summers, Monroe, and Mercer Counties (counties are presented in fig. 2).

Equations developed in this study should not be applied to stream locations with drainage areas outside the range of values used in equation development (table 1). The Potomac River, downstream from the confluence of the North Branch and South Branch, and the Shenandoah River have drainage areas outside the range of values used to develop the East Region equations. The equations should not be applied to these stream locations, but gaging-station discharges (table 4) may be used in making discharge estimates on these rivers.

SUMMARY

Engineers commonly use low-recurrence-interval (between 1.1 and 3.0 years) peak discharges as design components for developing stream-restoration plans. Determining discharges for various recurrence

intervals at stream locations where gaging stations are not present using regional equations can be less expen-sive and less difficult than determining discharge fre-quencies by individually studying nearby streamflow-gaging stations for each and every ungaged location. Therefore, the U.S. Geological Survey (USGS), in cooperation with the: West Virginia Department of Transportation, Division of Highways; West Virginia Soil Conservation Agency; and West Virginia Geologi-cal and Economic Survey; developed equations for estimating low-recurrence-interval peak discharges for rural, unregulated streams in West Virginia.

The magnitudes of peak discharges with frequen-cies of exceedences between 1 and 3 years were deter-mined for 160 rural, unregulated West Virginia streamflow-gaging stations with a minimum record of 10 years through the 1997 water year. The randomness of the systematic annual-peak series was tested statisti-cally by means of Kendall’s tau to detect monotonic trends.

The 160 rural, unregulated West Virginia gaging stations were reduced to 154 for correlation and regional regression analysis; five gaging stations were excluded from the analysis because peak data were used to lengthen records for other nearby gaging sta-tions, and one gaging station was excluded because it was in a karst area.

Eleven basin characteristics, a shape factor, and flood frequencies from 154 West Virginia gaging sta-tions were considered for regression analysis. West Virginia data were augmented with available basin characteristics and flood-frequency data for 85 stations operated by surrounding States.

Multiple and simple least-squares regression models for the log10-transformed 1.5- and 2-year discharges with independent variables that describe the basin characteristics (log10-transformed and untrans-formed) were evaluated for 236 streamflow-gaging stations, and the regression residuals were plotted as areal distributions that defined three regions, desig-nated East, North, and South. Four stations with drain-age areas greater than 200 mi2 leveraged the East Region equations and were eliminated from consider-ation for the final equations. Regional equations for the

Limitations of Low-Recurrence-Interval Peak-Discharge Estimating Equations 17

1.1-, 1.2-, 1.3-, 1.4-, 1.5-, 1.6-, 1.7-, 1.8-, 1.9-, 2.0-, 2.5-, and 3-year peak discharges were determined by generalized least-squares regression. Log10-transformed drainage area was the most significant independent variable for all regions.

Examples of application of the regional regres-sion equations were presented for three situations: at a gaging station, on an ungaged stream, and on the same stream as a nearby gaging station (where “nearby” means that the drainage area for that location is between 50 and 150 percent of the drainage area at the gaged location).

Accuracies of estimating equations were quanti-fied by measuring the average standard error of predic-tion and equivalent years of record. The average standard error of prediction ranged from 27.4 to 52.4 percent, and the equivalent years of record ranged from 1.1 to 3.4 years. Equations developed in this study are applicable only to rural, unregulated streams within the boundaries of West Virginia. Caution should be used if equations are applied to heavily mined or karst areas in the State.

REFERENCES CITED

Andrews, E.D., 1980, Effective and bankfull discharges of streams in the Yampa River Basin, Colorado and Wyoming: Journal of Hydrology, v. 46, p. 311–330.

Annable, W.K., 1994, Morphological relations of rural water courses in southeastern Ontario for use in natural channel design: Guelph, Ontario, Canada, M.S. thesis, University of Guelph, School of Engineering.

Bisese, J.A., 1995, Methods for estimating magnitude and frequency of peak discharges of rural, unregulated streams in Virginia: U.S. Geological Survey Water-Resources Investigations Report 94-4148, 70 p.

Brunner, D.S., 1999, Methods for estimating bankfull discharge in gauged and ungauged urban streams: Waterloo, Ontario, Canada, B.S. thesis, University of Waterloo, 28 p.

Choquette, A.F., 1988, Regionalization of peak discharges for streams in Kentucky: U.S. Geological Survey Water-Resources Investigations Report 87-4209, 105 p.

Dillow, J.A., 1996, Technique for estimating magnitude and frequency of peak flows in Maryland: U.S. Geological Survey Water-Resources Investigations Report 95-4154, 55 p.

Dunne, Thomas, and Leopold, L.B., 1978, Water in Environmental Planning: San Francisco, Calif., W.H. Freeman and Co., 818 p.

Dury, G.H., 1973, Magnitude-frequency analysis and channel morphology, in Morisawa, M., ed., Geomorphology: Binghamton, State University of New York, Publications in Geomorphology, Fourth Annual Geomorphology Symposia Series Proceedings Volume, p. 91–122.

Federal Interagency Stream Restoration Working Group, 1998, Stream corridor restoration: principles, processes, and practices: accessed February 9, 2001, at URL http://www.usda.gov/ stream_restoration/.

Fenneman, N.M., 1938, Physiography of Eastern United States: New York, McGraw-Hill, 714 p.

_____1946, Physical divisions of the United States: Washington, D.C., U.S. Geological Survey special map, scale 1:7,000,000.

Flippo, H.N., Jr., 1982, Evaluation of the streamflow-data program in Pennsylvania: U.S. Geological Survey Water-Resources Investigations Report 82-21, 56 p.

Friel, E.A., Embree, W.N., Jack, A.R., and Atkins, J.T., Jr., 1989, Low-flow characteristics of streams in West Virginia: U.S. Geological Survey Water-Resources Investigations Report 88-4072, 34 p.

Glatfelter, D.R., 1984, Techniques for estimating magnitude and frequency of floods in Indiana: U.S. Geological Survey Water-Resources Investigations Report 84-4134, 110 p.

Hannum, C.H., 1976, Techniques for estimating magnitude and frequency of floods in Kentucky: U.S. Geological Survey Water-Resources Investigations Report 76-62, 70 p.

Hardison, C.H., 1969, Accuracy of streamflow characteristics: U.S. Geological Survey Professional Paper 650-D, p. 210–214.

_____1971, Predictive error of streamflow characteristics at ungaged sites: U.S. Geological Survey Professional Paper 750-C, p. 228–236.

18 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

Harman, W.A., Wise, D.E., Walker, M.A., Morris, R., Cantrell, M.A., Clemmons, M., Jennings, G.D., Clinton, D., and Patterson, J., Bankfull regional curves for North Carolina mountain streams: accessed February 2001, at URL http://www5.bae.ncsu.edu/bae/programs/ extension/wqg/sri/mtnpaper.html/.

Hey, R.D., 1975, Design discharge for natural channels, in Hey, R.D., and Davies, T.D., eds., Science, Technology and Environmental Management: Farnborough, U.K., Saxxon House, p. 73–88.

Hirsch, R.M., Slack, J.R., and Smith, R.A., 1982, Techniques of trend analysis for monthly water quality data: Water Resources Research, v. 18, no. 1, p. 107–121.

Hodge, S.A., and Tasker, G.D., 1995, Magnitude and frequency of floods in Arkansas: U.S. Geological Survey Water-Resources Investigations Report 95-4224, 52 p.

Interagency Advisory Committee on Water Data, 1976, Guidelines for determining flood flow frequency: Water Resources Council Bulletin 17, 26 p.

_____1982, Guidelines for determining flood flow frequency: Water Resources Council Bulletin 17B, 28 p.

Jones, W. K., 1997, Karst Hydrology of West Virginia: Charles Town, W.V., Karst Waters Institute, Inc., Special Publication 4, 111 p.

Kendall, M.G., 1975, Rank correlation methods (4th ed.): London, Charles Griffin, 202 p.

Kirby, W., 1980, Computer routines for probability distributions, random numbers, and related functions: U.S. Geological Survey Open-File Report 80-448, 61 p.

Koltun, G.F., and Roberts, J.W., 1990, Techniques for estimating flood-peak discharges of rural, unregulated streams in Ohio: U.S. Geological Survey Water-Resources Investigations Report 89-4126, 68 p.

Leopold, L.B., 1994, A view of the river: Cambridge, Mass., Harvard University Press, 298 p.

Leopold, L.B., and Wolman, M.G., 1957, River channel patterns—braided, meandering and straight: U.S. Geological Survey Professional Paper 282-B, p. 39–85.

Lumb, A.M., Kittle, J.L., Jr., and Flynn, K.M., 1990, Users manual for ANNIE, computer program for interactive hydrologic analysis and data management: U.S. Geological Survey Water-Resources Investigations Report 89-4080, 236 p.

Mathes, M.V., Jr., 1977, Drainage areas of the Guyandotte River Basin, West Virginia: U.S. Geological Survey Open-File Report 77-801, 56 p.

Mathes, M.V., Kirby, J.R., Payne, D.D., and Shultz, R.A., 1982, Drainage areas of the Kanawha River Basin, West Virginia: U.S. Geological Survey Open-File Report 82-351, 222 p.

Nixon, M., 1959, A study of bankfull discharges of rivers in England and Wales, in Proceedings of the Institution of Civil Engineers: v. 12, p. 157–175.

Osterkamp, W.R., and Hupp, C.R., 1984, Geomorphic and vegetative characteristics along three northern Virginia streams: Geological Society of America Bulletin, v. 95, p. 1093–1101.

Pickup, G., and Warner, R.F., 1976, Effects of hydrologic regime on the magnitude and frequency of dominant discharge: Journal of Hydrology, v. 29, p. 51–75.

Preston, J.S., and Mathes, M.V., 1984, Stream drainage areas for the Little Kanawha River Basin, West Virginia: U.S. Geological Survey Open-File Report 84-861, 171 p.

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Schumm, S.A., 1960, The shape of alluvial channels in relation to sediment type: U.S. Geological Survey Professional Paper 352-B, p. 17–30.

Stedinger, J.R., and Tasker, G.D., 1985, Regional hydrologic analysis 1—ordinary, weighted, and generalized least squares compared: Water Resources Research, v. 21, no. 9, p. 1421–1432.

Stewart, D.K., and Mathes, M.V., 1995, Drainage areas of the Monongahela River Basin, West Virginia: U.S. Geological Survey Open-File Report 95-170, 79 p.

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References Cited 19

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Whiting, P.J., Stamm, J.F., Moog, D.B., and Orndorff, R.L., 1999, Sediment transporting flows in headwater streams: Geological Society of America Bulletin, v. 111, no. 3, p. 450–466.

Wiley, J.B., 1997, Drainage areas of West Virginia streams tributary to the Ohio River: U.S. Geological Survey Open-File Report 97-231, 70 p.

Wiley, J.B., Atkins, J.T., and Tasker, G.D., 2000, Estimating magnitude and frequency of peak discharges for rural, unregulated, streams in West Virginia: U.S. Geological Survey Water-Resources Investigations Report 00-4080, 93 p.

Wiley, J.B., and Hunt, M.L., 1995, Drainage areas of the Potomac River Basin, West Virginia: U.S. Geological Survey Open-File Report 95-292, 60 p.

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Wilson, M.W., 1979, Drainage areas of the Twelvepole Creek Basin, West Virginia; Big Sandy River Basin, West Virginia; Tug Fork Basin, Virginia, Kentucky, West Virginia: U.S. Geological Survey Open-File Report 79-746, 49 p.

Wolman, M.G., and Leopold, L.B., 1957, River floodplains: some observations on their formation: U.S. Geological Survey Professional Paper 282-C, 86 p.

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20 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

TABLES 2–4

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

0159

5000

MD

39.2

6079

.390

73.1

30.5

17.5

2,45

078

482.

7577

18.5

- -

- -

0159

5300

WV

39.3

6779

.179

42.6

70.6

16.8

2,67

075

412.

960

2084

.50.

560

0159

9500

WV

39.4

1079

.001

46.5

62.4

14.5

1,83

075

372.

950

2129

.3.5

7401

5955

00M

D39

.390

79.1

8022

548

.726

.92,

820

7346

2.75

7020

- -

- -

0159

6000

MD

39.4

8079

.070

287

47.6

43.1

2,67

077

45.5

2.75

6022

- -

- -

0159

6500

MD

39.5

7079

.100

49.1

65.1

19.1

2,51

081

442.

7557

20.5

- -

- -

0159

7000

MD

39.5

0079

.160

16.7

137

9.3

2,51

079

462.

7560

21-

--

-01

5980

00M

D39

.480

79.0

7011

569

.824

.82,

407

8344

.52.

7556

.721

- -

- -

0159

9000

MD

39.4

9079

.040

72.4

62.7

17.0

2,16

692

41.5

2.75

49.8

24-

--

-

0160

0000

MD

39.5

7078

.840

596

36.3

65.6

2,26

574

432.

7555

22-

--

-01

6015

00M

D39

.670

78.7

9024

755

.034

.71,

875

7036

2.75

44.4

23-

--

-01

6030

00M

D39

.620

78.7

7087

739

.182

.12,

155

7342

2.75

52.5

21-

--

-01

6045

00W

V39

.443

78.8

2221

117

.034

.51,

280

7436

2.9

3522

6.72

.565

0160

5500

WV

38.6

3679

.338

179

46.9

25.7

2,94

080

402.

940

2226

.7.3

79

0160

5700

WV

38.6

9679

.388

.45

1,07

01.

03,

700

9036

2.9

3522

502

.550

0160

6000

WV

38.9

8579

.236

335

39.1

47.7

3,12

080

442.

950

2229

.3.5

3601

6065

00W

V38

.991

79.1

7667

627

.262

.82,

910

8040

2.9

5022

16.2

.433

0160

6800

WV

38.8

0679

.214

1.43

280

2.5

2,04

075

322.

940

2213

2.4

5001

6075

00W

V38

.631

79.2

4410

330

.123

.52,

470

8038

2.9

3222

16.1

.522

0160

8000

WV

39.0

1278

.956

277

20.5

61.2

2,18

080

332.

932

2214

.7.4

7701

6081

00W

V39

.089

78.8

99.2

478

0.6

1,77

099

322.

930

2223

5.4

5001

6085

00W

V39

.447

78.6

541,

486

14.4

122.

02,

250

7535

2.9

3523

4.83

.453

0160

9000

MD

39.5

5078

.560

148

13.5

40.3

1,31

079

362.

85-

-23

.5-

--

-01

6095

00M

D39

.550

78.5

605.

0861

.25.

481

890

36.5

2.85

2923

- -

- -

Table 2 23

0160

9800

WV

39.4

9978

.489

108

35.4

27.0

1,22

070

342.

930

2314

.10.

797

0161

0000

MD

39.5

4078

.460

3,12

910

.515

81,

920

7638

2.6

4023

- -

- -

0161

0150

MD

39.7

0078

.320

10.4

46.3

8.8

1,06

062

.437

2.9

3023

- -

- -

0161

0155

MD

39.6

5078

.340

102

17.5

34.3

1,12

073

.438

2.85

- -

24-

--

-01

6105

00W

V39

.182

78.5

0730

618

.849

.72,

040

7535

2.9

2423

6.68

.436

0161

1500

WV

39.5

8278

.310

675

10.4

105.

11,

700

7536

2.9

2624

6.43

.463

0161

2500

MD

39.7

1078

.230

16.9

93.6

5.8

851

7437

.52.

923

21-

--

-01

6130

00M

D39

.700

78.1

804,

090

7.93

196

1,80

377

35.5

2.85

36.9

22-

--

-01

6131

50M

D39

.692

78.1

324.

8047

.56.

572

027

.837

.52.

935

24-

--

-01

6131

60M

D39

.691

78.1

271.

2013

22.

868

340

37.5

2.9

2624

- -

- -

0161

3900

VA

39.2

1078

.290

15.0

167

7.9

1,20

070

37.0

2.80

23.4

24.2

- -

- -

0161

4000

WV

39.5

1278

.038

235

9.20

41.9

890

7039

3.0

2624

3.88

.570

0161

5000

VA

39.1

8078

.070

57.4

17.4

20.2

760

3838

.43.

0422

.524

.8-

--

-01

6160

00V

A39

.180

78.0

9016

.537

.89.

980

042

38.3

2.93

22.9

25.1

- -

- -

0161

6500

WV

39.4

2477

.939

273

5.90

50.9

630

3040

3.0

2424

3.39

.320

0161

7000

WV

39.4

6977

.972

11.3

34.5

7.8

740

3038

3.0

2624

17.8

.380

0161

7800

MD

39.5

1077

.780

18.9

23.8

9.6

509

11.7

39.5

3.1

- -

26-

--

-01

6180

00M

D39

.430

77.8

005,

936

5.98

248.

51,

524

6837

2.59

36.1

23-

--

-01

6194

75M

D39

.470

77.6

60.1

040

1.5

451

226

39.5

3.15

2526

- -

- -

0161

9500

MD

39.4

5077

.730

281

10.8

51.8

781

29.8

403.

130

.626

- -

- -

0162

0500

VA

38.3

4079

.240

17.2

148

9.6

3,33

098

42.1

3.65

24.7

22.0

- -

- -

0162

1000

VA

38.5

0079

.050

72.6

107

15.0

2,87

010

039

.12.

8024

.521

.5-

--

-01

6212

00V

A38

.470

78.9

909.

4588

.24.

61,

830

7435

.52.

8025

.222

.2-

--

-01

6214

00V

A38

.430

78.8

805.

5237

.94.

41,

350

238

.53.

0028

.022

.8-

--

-01

6214

50V

A38

.390

78.9

20.7

217

61.

41,

290

837

.42.

8327

.123

.4-

--

-

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

24 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0162

2000

VA

38.3

4078

.910

379

43.2

38.9

2,04

052

39.0

3.09

25.4

22.2

- -

- -

0162

2100

VA

38.3

3078

.940

1.55

100

2.9

1,25

025

39.0

3.24

27.0

24.0

- -

- -

0162

2300

VA

38.1

6079

.270

.55

973

1.5

2,00

095

39.5

2.95

24.3

24.7

- -

- -

0162

2400

VA

38.2

0079

.220

.49

950

1.0

1,80

063

37.8

2.88

24.6

25.0

- -

- -

0163

2000

VA

38.6

4078

.850

210

44.3

25.8

2,02

089

35.8

3.09

24.0

21.0

- -

- -

0163

2300

VA

38.5

8078

.760

8.15

48.8

5.4

1,26

015

37.4

2.90

24.5

24.2

- -

- -

0163

2900

VA

38.6

9078

.640

93.2

20.5

25.1

1,40

050

38.0

3.58

23.8

24.2

- -

- -

0163

2950

VA

38.8

0078

.720

.31

500

1.0

1,45

098

35.2

2.87

23.3

23.8

- -

- -

0163

2970

VA

38.7

6078

.690

6.49

61.8

4.5

1,20

045

35.2

2.78

23.3

23.8

- -

- -

0163

3000

VA

38.7

5078

.640

506

24.3

45.9

1,67

053

37.0

3.14

24.6

22.4

- -

- -

0163

3500

VA

38.8

7078

.630

79.4

28.6

20.4

2,03

086

34.0

2.80

23.2

23.4

- -

- -

0163

3650

VA

38.9

3078

.550

3.66

292.

12.

51,

510

6035

.22.

5222

.523

.9-

--

-01

6340

00V

A38

.980

78.3

4076

89.

8610

31,

430

5036

.53.

0323

.923

.0-

--

-01

6345

00V

A39

.080

78.3

3010

333

23.4

1,35

086

34.6

2.87

22.6

23.8

- -

- -

0163

6500

WV

39.2

8277

.789

3,02

26.

7018

3.8

1,54

050

423.

024

255.

700.

334

0163

7000

MD

39.4

8077

.540

8.83

210

5.1

1,01

048

423.

234

24-

--

-01

6375

00M

D39

.430

77.5

6066

.947

.523

.91,

110

3742

.53.

1535

23.5

- -

- -

0163

8480

VA

39.2

5077

.580

89.6

14.1

27.5

600

3041

.33.

1920

.223

.5-

--

-01

6385

00M

D39

.270

77.5

409,

651

5.56

270.

91,

356

5939

.53.

0530

.623

- -

- -

0164

3700

VA

38.9

9077

.800

123

16.8

22.9

700

4039

.83.

1820

.324

.3-

--

-

0164

4000

VA

39.0

2077

.580

332

8.25

40.6

660

3540

.03.

1820

.423

.8-

--

-01

6441

00V

A39

.070

77.6

102.

0571

.73.

156

017

39.9

3.00

20.5

24.4

- -

- -

0200

9500

VA

38.2

7079

.670

.74

800

2.0

2,38

070

40.8

2.80

24.2

20.7

- -

- -

0201

1400

VA

38.0

4279

.882

158

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

0201

1460

VA

38.2

4579

.769

60.1

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

Table 2 25

0201

1480

VA

38.1

3579

.866

85.8

27.0

5.3

- -

- -

- -

- -

- -

- -

- -

- -

0201

1500

VA

38.0

7079

.900

134

44.4

33.4

2,89

090

40.9

2.86

24.0

20.8

- -

- -

0201

2500

VA

37.8

8079

.980

411

25.3

57.6

2,48

080

40.8

2.74

23.4

21.2

- -

- -

0201

2950

VA

37.6

6080

.240

.66

592

1.7

2,33

068

37.8

2.55

19.6

24.0

- -

- -

0201

3000

VA

37.8

0080

.050

164

40.5

27.3

2,23

087

38.5

2.56

20.8

23.4

- -

- -

0201

4000

VA

37.7

3080

.040

153

27.3

39.8

2,32

085

38.6

2.62

19.6

24.4

- -

- -

0305

0000

WV

38.8

0979

.882

185

24.5

37.6

3,11

080

562.

890

219.

440.

582

0305

0500

WV

38.9

2479

.879

271

13.8

55.0

2,94

080

502.

890

211.

65.5

7703

0506

50W

V38

.976

79.8

38.3

811

01.

32,

025

8048

2.8

8023

101

.650

0305

1000

WV

39.0

2979

.936

406

11.2

71.8

2,69

080

482.

890

224.

46.5

96

0305

1500

WV

38.9

3980

.090

122

43.0

26.6

2,60

080

542.

810

024

4.29

.567

0305

2000

WV

39.0

3980

.068

148

25.7

37.9

2,48

080

532.

810

024

47.4

.607

0305

2340

WV

39.0

0580

.256

2.33

38.6

2.9

1,55

060

482.

780

256.

99.5

5003

0525

00W

V38

.964

80.1

5314

.354

.012

.61,

870

6048

2.7

9025

46.5

.642

0305

3500

WV

39.0

5180

.115

277

22.5

54.0

2,11

060

522.

790

2513

.0.5

58

0305

4500

WV

39.1

5080

.039

914

11.2

88.4

2,41

075

502.

790

248.

29.5

5903

0550

20W

V39

.125

79.9

97.6

026

5.8

1,79

020

472.

770

2540

.6.7

5003

0550

40W

V39

.153

79.9

793.

1542

.33.

51,

780

3547

2.7

7025

50.3

.750

0305

6250

WV

39.3

3679

.994

96.8

28.3

23.0

1,68

060

462.

760

259.

96.6

3103

0565

00W

V39

.350

80.0

421,

304

12.0

114.

82,

220

7549

2.7

7024

2.52

.564

0305

6600

WV

39.3

7979

.963

2.33

107

2.0

1,47

030

462.

640

2596

.0.6

5003

0573

00W

V38

.869

80.4

5828

.851

.011

.91,

380

5048

2.7

8025

3.94

.943

0305

7500

WV

38.9

7580

.444

25.7

19.7

9.5

1,35

050

482.

760

255.

56.9

2703

0580

00W

V39

.003

80.4

7410

113

.230

.41,

340

5547

2.7

7026

2.69

.718

0305

8500

WV

39.0

9180

.468

181

5.40

39.4

1,34

055

482.

770

252.

48.6

94

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

26 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0305

9000

WV

39.2

7180

.356

384

3.60

71.4

1,25

030

482.

755

252.

310.

758

0305

9500

WV

39.2

2880

.297

84.6

8.90

16.4

1,35

030

482.

755

246.

03.6

1803

0605

00W

V39

.286

80.5

438.

3242

.33.

51,

220

4048

2.7

4024

10.6

.988

0306

1000

WV

39.4

2280

.276

759

2.50

89.3

1,26

050

462.

750

252.

18.5

7703

0615

00W

V39

.504

80.1

7211

67.

4023

.51,

300

6546

2.7

3024

6.62

.660

0306

2400

WV

39.6

0879

.955

11.0

132

8.4

1,42

075

442.

740

2626

.0.7

3203

0625

00W

V39

.629

79.9

5363

.246

.023

.41,

770

6544

2.7

5026

28.6

.605

0306

3950

WV

38.8

8279

.596

1.08

265

1.3

3,10

060

572.

870

2219

2.3

7003

0650

00W

V39

.072

79.6

2334

941

.837

.63,

310

8052

2.8

8022

11.8

.500

0306

6000

WV

39.1

2779

.469

85.9

8.10

21.4

3,25

050

522.

870

2111

.6.4

30

0306

8610

WV

38.9

0779

.697

5.06

451

3.1

3,25

090

522.

880

2212

6.4

3003

0690

00W

V39

.096

79.6

7721

329

.584

.73,

300

9046

2.8

8022

8.59

.440

0306

9500

WV

39.1

2379

.681

722

29.3

87.7

3,25

085

492.

870

2221

.3.4

6903

0698

50W

V39

.259

79.7

22.9

530

51.

12,

105

6050

2.9

8023

282

.650

0306

9880

WV

39.2

8979

.704

12.2

105

8.1

2,29

060

522.

770

2448

.2.5

60

0307

0000

WV

39.3

4679

.666

974

24.0

118.

42,

950

8051

2.8

7023

10.3

.481

0307

0500

WV

39.6

1679

.705

200

10.4

24.4

2,07

010

492.

755

2249

.8.5

9303

0710

00W

V39

.607

79.7

781,

354

21.5

145.

02,

700

8050

2.8

7022

12.8

.502

0307

1500

WV

39.6

6779

.862

1,38

021

.415

1.7

2690

8050

2.8

7022

12.8

.490

0307

2000

PA39

.760

79.9

7022

93.

9442

.94

1100

4441

.62.

345

24-

--

-

0307

2590

PA39

.800

79.8

0016

.313

56.

6113

4045

41.9

2.45

- -

26-

--

-03

0754

50M

D39

.410

79.3

50.5

799

.41.

12,

520

7947

.52.

75-

-20

- -

- -

0307

5500

MD

39.4

2079

.430

134

6.09

20.0

2,61

064

502.

774

18-

--

-03

0756

00M

D39

.490

79.4

20.5

320

41.

12,

470

6349

.52.

7-

-20

- -

- -

0307

6505

MD

39.6

6079

.430

.22

415

.76

1,93

045

482.

65-

-20

- -

- -

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

Table 2 27

0307

6600

MD

39.6

4079

.320

48.9

65.6

15.9

2,46

044

482.

7-

-20

- -

- -

0310

8000

PA40

.630

80.3

4017

88.

3642

.61

1100

3838

.02.

347

22-

--

-03

1090

00O

H40

.780

80.7

606.

1955

.65.

231,

188

1539

2.5

3420

- -

- -

0310

9500

OH

40.6

8080

.540

496

8.29

52.0

1,11

215

37.5

2.5

3222

- -

- -

0311

0000

OH

40.5

4080

.730

147

9.81

28.9

1,08

944

402.

536

22-

--

-

0311

0980

OH

40.3

3280

.812

.04

500

.27

1,25

011

392.

5-

-22

- -

- -

0311

1150

PA40

.200

80.4

1010

.334

.46.

3611

9012

39.2

2.4

- -

22-

--

-03

1114

50O

H40

.207

80.9

231.

3195

.22.

241,

110

8.2

39.5

2.5

- -

21-

--

-03

1114

55O

H40

.208

80.9

2010

.937

.95.

981,

150

1139

.52.

5-

-21

.5-

--

-03

1114

70O

H40

.302

80.8

491.

5778

.82.

201,

220

11.5

392.

5-

-22

.5-

--

-

0311

1490

OH

40.2

7280

.847

.44

130

1.63

1,13

014

.839

2.5

- -

22.5

- -

- -

0311

1500

OH

40.1

9080

.730

123

14.4

25.8

1,10

615

392.

538

23-

--

-03

1115

40O

H40

.152

80.8

83.3

425

4.8

71,

160

20.6

39.5

2.5

- -

22-

--

-03

1120

00W

V40

.044

80.6

6128

111

.134

.81,

230

5040

2.5

3024

10.1

0.69

803

1137

00W

V39

.961

80.7

014.

9514

02.

81,

200

6042

2.5

3024

59.8

.584

0311

4000

OH

39.9

1080

.920

134

16.0

26.2

1,14

28.

341

2.5

3523

- -

- -

0311

4240

OH

39.7

8281

.056

.53

246

1.63

1,12

036

.841

.52.

5-

-24

- -

- -

0311

4500

WV

39.4

7580

.997

458

3.90

72.0

1,06

060

462.

632

242.

33.7

4803

1145

50W

V39

.506

81.0

28.8

812

01.

492

090

432.

528

2475

.4.6

5003

1146

00W

V39

.503

81.0

161.

2211

01.

896

070

432.

528

2444

.0.6

50

0311

4650

WV

39.4

8781

.007

4.19

62.7

1.6

900

4043

2.5

2824

30.3

.671

0311

5280

OH

39.6

2581

.048

5.45

90.3

3.03

985

61.1

422.

5-

-25

- -

- -

0311

5400

OH

39.5

6381

.204

210

7.0

42.3

4597

450

41.5

2.5

- -

25-

--

-03

1154

10O

H39

.543

81.2

09.1

328

9.6

180

552

.641

.52.

5-

-25

- -

- -

0311

5510

OH

39.4

7381

.314

1.52

114

1.97

865

53.3

40.5

2.5

- -

26-

--

-

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

28 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0311

5600

OH

39.7

7081

.370

3.46

75.5

3.64

1,03

025

.240

2.5

3223

- -

- -

0311

5710

OH

39.6

6181

.449

.19

366

.95

960

47.9

402.

5-

-23

.5-

--

-03

1506

00O

H39

.473

81.4

66.9

958

.01.

913

721

2940

2.5

- -

25-

--

-03

1514

00W

V38

.743

80.5

2611

242

.130

.61,

770

7048

2.7

9025

9.38

0.56

203

1515

00W

V38

.824

80.5

9315

533

.639

.31,

600

7048

2.7

7025

1.56

.675

0315

2000

WV

38.9

3480

.839

387

17.4

62.8

1,28

065

482.

760

251.

11.6

7603

1522

00W

V39

.124

80.6

912.

9113

32.

51,

090

5048

2.6

4024

43.7

.740

0315

2500

WV

38.9

6280

.867

144

6.70

27.8

1,05

055

482.

640

243.

27.6

9903

1530

00W

V38

.862

81.0

3516

210

.228

.71,

110

7548

2.6

4025

3.26

.810

0315

3500

WV

38.9

2281

.098

913

11.1

86.2

1,17

065

482.

745

251.

33.6

98

0315

4000

WV

38.8

4481

.223

205

5.50

29.1

1,03

050

472.

632

255.

27.8

0803

1542

50W

V38

.803

81.3

662.

8261

.92.

888

040

452.

626

2432

.9.7

4203

1545

00W

V38

.961

81.3

9079

.46.

5022

.691

045

442.

624

254.

46.8

5303

1550

00W

V39

.059

81.3

901,

516

3.10

138.

31,

090

6048

2.6

3525

.914

.651

0315

5200

WV

39.0

7881

.190

210

5.60

43.1

1,02

045

462.

634

2428

.2.7

13

0315

5450

WV

39.0

8381

.261

3.52

89.0

2.6

890

8043

2.6

2425

55.6

.850

0315

5500

WV

39.1

1981

.278

453

4.30

53.2

990

5545

2.6

3024

3.53

.752

0315

9540

OH

39.0

6481

.882

1.56

4.00

29.8

749

4240

.52.

6-

-26

- -

- -

0315

9700

WV

38.7

6581

.678

.70

80.0

1.3

885

3042

2.6

2325

48.0

.850

0317

1500

VA

37.2

9080

.620

2,94

18.

0319

92,

740

5143

.52.

8818

.824

.7-

--

-

0317

3000

VA

37.2

7080

.710

305

20.1

53.7

2,59

064

37.4

2.56

17.9

25.8

- -

- -

0317

5500

VA

37.3

1080

.850

223

35.9

45.0

2,81

071

40.6

2.57

26.2

25.4

- -

- -

0317

6500

VA

37.3

7080

.860

3,76

86.

7222

52,

700

5342

.32.

8019

.524

.8-

--

-03

1770

00W

V37

.400

80.8

0650

.637

.912

.32,

400

5038

2.9

2426

41.7

.490

0317

7500

WV

37.5

3280

.819

189

15.3

40.0

2,31

060

382.

930

2615

.8.5

32

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

Table 2 29

0317

7700

VA

37.2

6081

.280

39.8

31.6

15.2

2,80

090

43.2

2.50

31.1

25.0

- -

- -

0317

8500

WV

37.5

0481

.128

32.0

87.3

9.5

2,71

090

442.

840

2584

.10.

772

0317

9000

WV

37.5

4481

.011

395

5.90

100.

02,

570

6040

2.8

4026

12.2

.522

0317

9500

WV

37.5

8580

.965

438

8.00

103.

02,

560

6040

2.8

4026

16.6

.568

0318

0000

WV

37.6

4580

.884

4,60

25.

4026

2.3

2,69

060

402.

924

2511

.7.2

87

0318

0350

WV

38.5

5879

.831

1.13

740

1.8

3,53

595

422.

880

2026

4.5

5003

1805

00W

V38

.544

79.8

3313

323

.819

.13,

620

8042

2.8

7021

15.4

.535

0318

0530

WV

38.5

0879

.784

1.28

109

3.1

3,12

070

422.

870

2148

.0.5

5003

1806

80W

V38

.409

79.8

121.

5248

83.

23,

350

9042

2.8

6021

48.0

.550

0318

1900

WV

38.2

3679

.974

.10

528

.62,

620

9940

2.9

4522

111

.550

0318

2000

WV

38.2

1180

.075

108

28.3

25.4

2,91

080

402.

940

2211

.1.5

1403

1825

00W

V38

.186

80.1

3154

016

.166

.13,

180

8042

2.8

5521

6.93

.549

0318

2700

WV

37.9

0880

.291

144

19.9

27.5

2,48

095

402.

940

2318

.3.5

3503

1830

00W

V37

.685

80.4

5780

.837

.519

.22,

630

7038

2.9

3524

20.2

.524

0318

3500

WV

37.7

2480

.642

1,36

49.

2014

0.8

2,84

080

412.

850

225.

78.5

27

0318

3550

WV

37.7

3880

.710

3.84

544

3.5

2,70

595

362.

945

2519

2.6

5003

1835

70W

V37

.684

80.7

172.

7128

02.

51,

950

6036

2.9

4525

35.2

.650

0318

4000

WV

37.6

4080

.805

1,61

99.

0016

4.0

2,77

075

402.

850

234.

91.5

3803

1845

00W

V37

.670

80.8

936,

256

7.80

264.

02,

670

6040

2.9

3024

11.7

.308

0318

5000

WV

37.7

6181

.162

52.7

12.3

20.6

2,57

080

442.

845

2436

.8.5

50

0318

5020

WV

37.7

2581

.101

.62

350

1.0

2,68

060

432.

850

2446

.9.6

5003

1855

00W

V38

.022

81.0

296,

826

6.60

309.

92,

700

6540

2.9

3524

16.8

.350

0318

6000

WV

38.0

6581

.078

6,85

06.

6031

4.9

2,70

065

402.

935

2417

.2.3

2903

1865

00W

V38

.379

80.4

8412

841

.931

.43,

410

9952

2.8

100

2113

.5.5

4203

1870

00W

V38

.366

80.6

0123

627

.737

.03,

180

9550

2.8

100

228.

33.5

41

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

30 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0318

7300

WV

38.2

5880

.324

9.78

126

6.5

3,95

099

532.

880

2193

.30.

408

0318

7500

WV

38.2

9580

.527

80.4

52.5

27.2

3,27

099

492.

890

2245

.8.4

8603

1890

00W

V38

.229

80.5

8315

076

.620

.63,

320

9549

2.8

8022

37.7

.624

0318

9100

WV

38.2

9180

.641

529

21.9

46.6

3,05

092

492.

880

2323

.8.4

8503

1895

00W

V38

.271

80.8

1968

018

.062

.82,

960

9049

2.8

8024

19.3

.557

0318

9650

WV

38.1

7680

.869

2.78

143

2.8

2,08

095

492.

770

2331

.0.7

0703

1900

00W

V38

.112

80.8

7628

715

.144

.92,

880

7548

2.8

7022

17.4

.629

0319

0400

WV

38.1

9080

.947

365

17.3

55.7

2,70

080

482.

870

2349

.2.5

1303

1905

00W

V38

.225

80.9

324.

2235

.03.

81,

750

2548

2.7

6024

18.3

.650

0319

1400

WV

38.2

5880

.990

4.28

110

3.5

1,50

060

482.

760

2411

1.6

50

0319

1500

WV

38.2

6281

.023

40.2

53.1

13.1

1,70

080

482.

755

2518

.7.6

0703

1920

00W

V38

.233

81.1

811,

317

19.2

99.9

2,69

085

482.

870

244.

41.5

9903

1925

00W

V38

.225

81.1

921,

402

19.2

100.

92,

690

8548

2.8

7024

4.41

.507

0319

3000

WV

38.1

3881

.214

8,37

16.

3032

9.0

2,69

065

422.

835

244.

41.3

6103

1937

25W

V37

.981

81.2

74.4

253

31.

01,

800

6544

2.7

4025

151

.450

0319

4700

WV

38.5

9780

.491

266

45.0

54.1

3,00

088

542.

810

022

11.4

.476

0319

5000

WV

38.6

1780

.556

281

34.8

65.4

2,90

090

522.

810

022

11.4

.540

0319

5100

WV

38.6

3580

.466

51.9

67.5

16.8

2,09

089

502.

710

024

23.2

.557

0319

5250

WV

38.6

8980

.432

46.5

125

15.2

2,24

081

502.

710

024

55.3

.550

0319

5500

WV

38.6

6380

.710

542

29.2

81.6

2,43

090

502.

890

243.

30.5

71

0319

5600

WV

38.6

7780

.713

6.98

71.0

4.7

1,18

050

482.

760

2522

.9.6

2903

1970

00W

V38

.471

81.2

841,

145

12.6

155.

91,

840

8547

2.7

6025

2.26

.600

0319

7150

WV

38.6

2681

.234

2.01

100

2.0

1,01

060

442.

730

2648

.0.9

5003

1979

00W

V38

.354

81.5

23.4

924

21.

11,

015

7044

2.7

2426

88.0

.850

0319

8450

WV

38.1

2581

.692

7.75

49.0

4.8

1,23

050

432.

724

2628

.1.9

47

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

Table 2 31

0319

8500

WV

38.1

8081

.712

391

28.1

63.0

1,75

095

432.

728

263.

210.

600

0319

8780

WV

38.0

0681

.815

1.97

330

2.5

1,41

095

442.

724

2611

7.6

5003

1988

00W

V38

.028

81.8

341.

2816

72.

01,

130

9044

2.7

2426

132

.650

0319

9000

WV

38.0

8081

.836

269

19.7

32.3

1,63

095

442.

726

265.

13.6

0903

1994

00W

V38

.155

81.8

5231

815

.540

.41,

540

9544

2.7

2426

3.25

.485

0320

0500

WV

38.3

3981

.842

862

10.5

106.

91,

450

9044

2.7

2426

1.72

.493

0320

0600

WV

38.4

5181

.854

.87

180

1.5

835

5042

2.7

2326

70.4

.850

0320

1000

WV

38.5

2681

.631

238

3.90

44.5

940

4545

2.6

2425

2.19

.875

0320

1410

WV

38.4

5081

.932

8.47

25.0

5.9

820

2542

2.7

2226

16.4

.602

0320

1420

WV

38.4

7981

.930

2.05

93.0

2.0

820

5042

2.7

2226

40.6

.850

0320

1440

WV

38.6

4482

.048

1.04

108

1.6

810

6042

2.6

2228

42.2

.850

0320

1480

WV

38.8

3882

.095

.70

128

1.3

710

9040

2.6

2227

52.8

.850

0320

2000

OH

38.8

7082

.360

585

2.81

71.6

829

21.9

402.

621

26-

--

-03

2024

00W

V37

.604

81.6

4530

635

.237

.52,

080

9146

2.8

3525

4.60

.398

0320

2480

WV

37.5

6381

.652

7.34

94.3

4.9

1,71

085

452.

832

2740

.8.5

92

0320

2750

WV

37.6

2381

.707

126

32.0

25.8

1,15

080

462.

832

268.

40.5

1203

2030

00W

V37

.740

81.8

7775

812

.986

.91,

950

9045

2.8

3426

5.44

.586

0320

3600

WV

37.8

4281

.976

833

10.4

99.2

1,90

090

452.

830

265.

83.4

8003

2040

00W

V38

.221

82.2

031,

224

7.70

144.

71,

790

9044

2.8

2626

1.17

.566

0320

4500

WV

38.3

8882

.113

256

4.10

48.5

950

8043

2.7

2326

1.55

.819

0320

5995

OH

38.4

1882

.510

.73

124

1.52

740

84.9

42.5

2.7

- -

28-

--

-03

2066

00W

V38

.017

82.2

9638

.521

.717

.21,

080

9243

2.7

2227

8.84

.694

0320

6800

WV

38.1

5482

.385

139

8.14

39.3

1,04

085

432.

722

274.

041.

029

0320

7000

WV

38.2

1782

.449

291

6.57

48.3

1,02

080

432.

722

272.

51.8

0603

2070

20W

V38

.249

82.4

3430

05.

7052

.31,

020

8043

2.7

2227

2.51

.873

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

32 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0320

7400

VA

37.2

2082

.100

19.8

119

6.3

1,70

095

40.5

2.78

20.5

29.2

- -

- -

0320

7500

VA

37.3

0082

.130

235

36.6

23.5

2,04

092

41.6

2.71

21.8

27.6

- -

- -

0320

7800

VA

37.3

5082

.200

297

26.5

31.8

2,00

090

43.5

2.60

22.2

26.6

- -

- -

0320

7962

KY

37.4

4982

.338

.82

510

1.46

- -

8244

2.8

2228

- -

- -

0320

8000

KY

37.4

1682

.421

392

16.9

52.7

1,90

0-

-44

2.8

2228

- -

- -

0320

8500

VA

37.2

1082

.300

286

19.3

23.5

2,12

097

42.6

2.82

19.2

28.7

- -

- -

0320

8950

VA

37.1

2082

.440

66.5

42.5

17.0

2,09

095

46.0

2.84

19.6

28.0

- -

- -

0320

9000

VA

37.2

3082

.340

221

10.2

41.3

2,00

092

46.9

2.82

19.3

27.6

- -

- -

0320

9575

KY

37.3

1182

.816

3.17

181

2.59

- -

- -

422.

822

28-

--

-03

2100

00K

Y37

.567

82.4

5856

.324

.321

.51,

400

8244

2.8

2228

- -

- -

0321

1500

KY

37.7

4482

.724

206

6.4

55.1

1,20

082

442.

822

28-

--

-03

2120

00K

Y37

.835

82.8

7110

38.

321

.01,

000

7945

2.8

2028

- -

- -

0321

2750

WV

37.4

4181

.600

174

24.5

23.9

2,12

075

432.

840

269.

780.

349

0321

2980

WV

37.3

9581

.803

209

24.1

39.3

2,07

085

432.

835

2725

.1.4

3903

2130

00W

V37

.486

81.8

4450

416

.849

.22,

030

9043

2.8

3227

4.98

.470

0321

3500

WV

37.4

4581

.871

31.0

61.4

11.7

1,83

090

442.

826

2732

.2.6

5203

2137

00W

V37

.673

82.2

8093

610

.299

.61,

800

9043

2.8

2827

2.37

.436

0321

4000

WV

37.8

1882

.389

1,18

88.

5011

7.1

1,70

090

432.

826

281.

60.5

1203

2145

00W

V37

.837

82.4

091,

280

8.00

125.

61,

660

9043

2.8

2628

1.60

.531

0321

4900

WV

38.0

0682

.515

1,50

76.

5014

4.6

1,55

090

432.

824

281.

32.4

32

0321

5500

KY

38.1

4482

.685

217

3.5

40.1

800

7544

2.7

2028

- -

- -

0321

6500

KY

38.3

3082

.939

400

3.7

47.2

900

6844

2.8

2028

- -

- -

0321

6540

KY

38.2

3482

.709

12.2

18.3

8.73

- -

- -

412.

720

29-

--

-03

2165

63K

Y38

.364

82.7

96.9

485

.01.

57-

--

-42

- -

20-

--

--

-

Tab

le 2

. Bas

in-c

hara

cter

istic

s da

ta u

sed

in th

e re

gres

sion

ana

lysi

s to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia—

Con

tinue

d [M

D, M

aryl

and;

OH

, Ohi

o; P

A, P

enns

ylva

nia;

VA

, Vir

gini

a; W

V, W

est V

irgi

nia;

--,

info

rmat

ion

not a

vaila

ble]

Sta

tio

nN

o.

Sta

teL

atit

ud

e,in

dec

imal

d

egre

es

Lo

ng

itu

de,

in d

ecim

al

deg

rees

Bas

in c

har

acte

rist

ics

Dra

inag

e ar

ea,

in s

qu

are

mile

s

Mai

n

chan

nel

sl

op

e,in

fee

tp

er m

ile

Str

eam

le

ng

th,

in m

iles

Mea

n

bas

inel

evat

ion

,in

fee

t ab

ove

sea

leve

l

Fo

rest

ed

area

,in

per

-ce

nt

Mea

nan

nu

al

pre

cip

i-ta

tio

n,

in in

ches

Two

-yea

r24

-ho

ur

pre

cip

i-ta

tio

nin

ten

sity

,in

inch

es

Mea

n

ann

ual

sn

owfa

ll,in

inch

es

Mea

nm

inim

um

Ja

nu

ary

tem

-p

erat

ure

,in

deg

rees

Fa

hre

nh

eit

Lo

cal

stat

ion

sl

op

e,in

fee

t p

er m

ile

Str

eam

-fl

ow

vari

a-b

ility

ind

ex

Table 2 33

T

able

3. P

eak-

disc

harg

e st

atis

tics

from

the

freq

uenc

y an

alys

is o

f the

gag

ing

stat

ion’

s sy

stem

atic

and

his

toric

al r

ecor

d us

ed to

dev

elop

low

-rec

urre

nce-

inte

rval

pea

k-di

scha

rge

estim

atin

g eq

uatio

ns fo

r ru

ral,

unre

gula

ted

stre

ams

in W

est V

irgin

ia

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

0159

5000

MD

1955

–199

036

00

- -

- -

- -

0.40

00.

377

- -

- -

0159

5300

WV

1955

–198

227

731

10

0.34

8.3

551.

090

-0.2

390.

083

0159

5500

MD

1950

–199

041

00

- -

- -

- -

1.63

3.8

77-

--

-01

5960

00M

D19

24–1

950

2532

1-

--

--

-.3

78.4

34-

--

-01

5965

00M

D19

49–1

990

420

0-

--

--

-.6

10.5

11-

--

-

0159

7000

MD

1949

–198

133

00

- -

- -

- -

.925

.659

- -

- -

0159

8000

MD

1925

–195

024

00

- -

- -

- -

.723

.545

- -

- -

0159

9000

MD

1931

–199

060

00

- -

- -

- -

.492

.453

- -

- -

0159

9500

WV

1948

–196

921

00

00

.371

-.46

3-.

064

-.10

0.5

4601

6000

00M

D19

36–1

950

1527

1-

--

--

-.4

72.4

33-

--

-

0160

1500

MD

1930

–199

061

00

- -

- -

- -

.983

.756

- -

- -

0160

3000

MD

1930

–198

152

102

2-

--

--

-.8

23.7

56-

--

-01

6045

00W

V19

39–1

997

590

00

0.3

83-.

264

-.09

8-.

196

.028

0160

5500

WV

1936

–199

751

120

01

0.4

19.6

04.4

36.1

29.1

8501

6057

00W

V19

65–1

977

130

00

0.4

04.3

60.3

85.4

61.0

33

0160

6000

WV

1940

–198

041

120

21

0.3

89.4

66.7

77.1

63.1

3501

6065

00W

V19

24–1

997

7012

01

30

.396

.961

.703

.063

.447

0160

6800

WV

1965

–197

713

00

00

.415

.305

.367

.308

.161

0160

7500

WV

1944

–199

754

120

22

0.4

33.7

77.6

78-.

117

.213

0160

8000

WV

1924

–199

768

120

01

0.4

23.8

98.6

40-.

054

.512

0160

8100

WV

1965

–197

713

00

00

.419

-.35

8.0

84.1

53.0

1701

6085

00W

V19

00–1

997

7412

01

30

.398

.667

.533

.091

.253

0160

9000

MD

1928

–198

122

00

- -

- -

- -

.165

.265

- -

- -

0160

9500

MD

1948

–197

625

00

- -

- -

- -

-.76

0.5

83-

--

-01

6098

00W

V19

67–1

977

110

00

0.4

06.3

28.3

75.3

09.2

13

0161

0000

MD

1936

–198

143

101

1-

--

--

--.

413

.010

- -

- -

0161

0150

MD

1965

–198

318

00

- -

- -

- -

-.09

1.1

41-

--

-01

6101

55M

D19

68–1

977

100

0-

--

--

-.1

01.2

83-

--

-01

6105

00W

V19

36–1

951

1467

0a 1

0.4

46.0

49.1

15-.

142

.511

0161

1500

WV

1923

–199

774

109

11

0.4

11-.

074

-.01

9.0

41.6

04

34 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0161

2500

MD

1948

–196

417

00

- -

- -

- -

0.19

60.

298

- -

- -

0161

3000

MD

1929

–199

463

00

- -

- -

- -

.502

.475

- -

- -

0161

3150

MD

1965

–198

622

00

- -

- -

- -

.244

.319

- -

- -

0161

3160

MD

1965

–197

612

00

- -

- -

- -

.643

.504

- -

- -

0161

3900

VA

1961

–199

131

00

- -

- -

- -

- -

- -

- -

- -

0161

4000

WV

1929

–199

746

00

01

0.44

5-.

531

.467

0.04

30.

683

0161

5000

VA

1944

–199

148

00

- -

- -

- -

- -

- -

- -

- -

0161

6000

VA

1950

–199

124

00

- -

- -

- -

- -

- -

- -

- -

0161

6500

WV

1948

–199

750

621

10

.470

.176

.244

.300

.002

0161

7000

WV

1949

–197

724

00

01

.459

-1.0

46.3

34.1

97.1

75

0161

7800

MD

1964

–199

027

00

- -

- -

- -

.584

.538

- -

- -

0161

8000

MD

1929

–199

062

00

- -

- -

- -

.288

.349

- -

- -

0161

9475

MD

1966

–197

611

00

- -

- -

- -

.628

.553

- -

- -

0161

9500

MD

1928

–199

063

00

- -

- -

- -

.323

.367

- -

- -

0162

0500

VA

1947

–199

145

00

- -

- -

- -

- -

- -

- -

- -

0162

1000

VA

- -

- -

55-

--

--

--

--

--

--

--

-01

6212

00V

A19

49–1

976

270

0-

--

--

--

--

--

--

-01

6214

00V

A-

--

-40

- -

- -

- -

- -

- -

- -

- -

- -

0162

1450

VA

- -

- -

25-

--

--

--

--

--

--

--

-01

6220

00V

A-

--

-13

0-

--

--

--

--

--

--

--

-

0162

2100

VA

1966

–197

510

00

- -

- -

- -

- -

- -

- -

- -

0162

2300

VA

1967

–197

610

00

- -

- -

- -

- -

- -

- -

- -

0162

2400

VA

1967

–199

121

00

- -

- -

- -

- -

- -

- -

- -

0163

2000

VA

- -

- -

155

- -

- -

- -

- -

- -

- -

- -

- -

0163

2300

VA

1950

–197

724

00

- -

- -

- -

- -

- -

- -

- -

0163

2900

VA

1961

–199

130

00

- -

- -

- -

- -

- -

- -

- -

0163

2950

VA

1966

–197

510

00

- -

- -

- -

- -

- -

- -

- -

0163

2970

VA

1972

–199

119

00

- -

- -

- -

- -

- -

- -

- -

0163

3000

VA

- -

- -

155

- -

- -

- -

- -

- -

- -

- -

- -

0163

3500

VA

- -

- -

63-

--

--

--

--

--

--

--

-

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

Table 3 35

0163

3650

VA

1971

–199

121

00

- -

- -

- -

- -

- -

- -

- -

0163

4000

VA

- -

- -

120

- -

- -

- -

- -

- -

- -

- -

- -

0163

4500

VA

1936

–199

155

00

- -

- -

- -

- -

- -

- -

- -

0163

6500

WV

1896

–199

780

128

24

00.

515

0.14

60.

134

0.03

30.

662

0163

7000

MD

1948

–197

730

00

- -

- -

- -

.355

.422

- -

- -

0163

7500

MD

1948

–199

043

00

- -

- -

- -

.664

.615

- -

- -

0163

8480

VA

- -

- -

40-

--

--

--

--

--

--

--

-01

6385

00M

D18

95–1

990

9610

21

- -

- -

- -

.187

.326

- -

- -

0164

3700

VA

- -

- -

100

- -

- -

- -

- -

- -

- -

- -

- -

0164

4000

VA

1889

–199

165

00

- -

- -

- -

- -

- -

- -

- -

0164

4100

VA

- -

- -

25-

--

--

--

--

--

--

--

-02

0095

00V

A19

66–1

975

100

0-

--

--

--

--

--

--

-02

0114

00V

A-

--

-75

- -

- -

- -

- -

- -

- -

- -

- -

0201

1460

VA

- -

- -

75-

--

--

--

--

--

--

--

-02

0114

80V

A19

74–1

984

110

0-

--

--

--

--

--

--

-

0201

1500

VA

- -

- -

75-

--

--

--

--

--

--

--

-02

0125

00V

A-

--

-75

- -

- -

- -

- -

- -

- -

- -

- -

0201

2950

VA

- -

- -

25-

--

--

--

--

--

--

--

-02

0130

00V

A-

--

-75

- -

- -

- -

- -

- -

- -

- -

- -

0201

4000

VA

- -

- -

122

- -

- -

- -

- -

- -

- -

- -

- -

0305

0000

WV

1916

–199

770

110

10

0.3

20.3

34.4

36.1

30.1

1303

0505

00W

V19

45–1

997

5311

00

10

.306

.715

.469

.104

.275

0305

0650

WV

1964

–197

714

00

00

.306

-.09

4.1

20-.

274

.189

0305

1000

WV

1908

–199

790

110

12

0.2

84.2

89.2

69.0

27.7

0903

0515

00W

V19

16–1

942

2711

02

00

.276

.176

.251

.157

.260

0305

2000

WV

1943

–199

746

110

10

0.2

65.2

27.2

76.1

66.1

0503

0523

40W

V19

66–1

975

100

01

0.2

46.7

88.4

40-.

222

.418

0305

2500

WV

1947

–199

751

00

00

.265

.402

.361

.121

.211

0305

3500

WV

1908

–199

783

00

00

.257

-.34

9-.

219

-.00

2.9

7803

0545

00W

V19

41–1

997

5711

00

b 10

.251

.352

.261

.143

.118

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

36 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0305

5020

WV

1966

–199

712

00

00

0.26

0-0

.516

-0.0

54-0

.091

0.73

003

0550

40W

V19

64–1

977

140

00

0.2

59.3

34.2

92-.

121

.584

0305

6250

WV

1985

–199

713

00

00

.227

.313

.265

-.05

1.8

5503

0565

00W

V19

08–1

938

310

00

0.2

19.2

51.2

39-.

026

.852

0305

6600

WV

1965

–197

713

00

00

.225

-.28

0.0

05.0

77.7

60

0305

7300

WV

1985

–199

713

00

00

.238

-.01

3.1

25.2

05.3

6003

0575

00W

V19

46–1

985

400

00

0.2

26-.

295

-.12

3-.

072

.521

0305

8000

WV

1947

–198

943

102

01

0.2

18.3

37.1

62-.

128

.229

0305

8500

WV

1916

–198

974

102

0c 1

0.2

05-.

085

-.07

4-.

123

.124

0305

9000

WV

1924

–198

360

102

10

0.1

91-.

488

-.28

6-.

016

.858

0305

9500

WV

1944

–197

027

00

00

.206

-.06

2.0

41-.

078

.588

0306

0500

WV

1952

–196

918

00

00

.165

-.34

7-.

091

.013

.970

0306

1000

WV

1908

–198

965

102

0d 1

0.1

78-.

183

-.14

0-.

002

.986

0306

1500

WV

1916

–199

773

901

00

.178

-.17

8-.

041

-.02

4.7

6803

0624

00W

V19

66–1

997

320

01

0.1

90.8

54.5

62-.

123

.330

0306

2500

WV

1947

–199

730

511

00

.187

.324

.368

-.17

2.1

8703

0639

50W

V19

65–1

977

120

01

0.3

511.

487

.674

.030

.945

0306

5000

WV

1941

–199

757

110

01

0.3

221.

310

.859

.167

.068

0306

6000

WV

1922

–199

776

110

01

0.3

37.7

46.5

96.1

81.0

2103

0686

10W

V19

74–1

997

150

00

0.3

34-.

032

.157

.162

.428

0306

9000

WV

1911

–199

672

110

21

0.3

11.9

92.7

21.0

64.4

2803

0695

00W

V19

14–1

997

8415

42

40

.307

1.14

4.7

91.1

34.0

7103

0698

50W

V19

66–1

977

120

01

0.2

80.6

09.4

12-.

030

.945

0306

9880

WV

1968

–199

714

301

00

.279

-.46

4.6

42-.

253

.227

0307

0000

WV

1921

–199

674

154

22

0.2

76.7

96.5

27.1

78.0

24

0307

0500

WV

1910

–199

783

110

10

0.2

30.6

92.7

11-.

066

.376

0307

1000

WV

1903

–195

847

142

10

0.2

91.1

30.2

10-.

004

.978

0307

1500

WV

1903

–192

616

142

10

0.1

96-.

284

-.09

1.0

17.9

6403

0720

00PA

1941

–197

535

00

- -

- -

- -

-.27

7.0

93-

--

-03

0725

90PA

1964

–197

815

00

- -

- -

- -

.132

.161

- -

- -

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

Table 3 37

0307

5450

MD

1965

–197

612

00

- -

- -

- -

-1.0

24-0

.164

- -

- -

0307

5500

MD

1942

–199

049

00

- -

- -

- -

.095

.151

- -

- -

0307

5600

MD

1965

–198

622

00

- -

- -

- -

.599

.452

- -

- -

0307

6505

MD

1965

–197

612

00

- -

- -

- -

-.47

5-.

034

- -

- -

0307

6600

MD

1965

–199

026

00

- -

- -

- -

.214

.239

- -

- -

0310

8000

PA19

16–1

975

500

0-

--

--

--.

216

-.07

2-

--

-03

1090

00O

H19

47–1

981

350

0-

--

--

-.4

41.2

56-

--

-03

1095

00O

H19

16–1

987

720

0-

--

--

-.2

14.1

62-

--

-03

1100

00O

H19

41–1

987

470

0-

--

--

-.2

96.2

00-

--

-03

1109

80O

H19

78–1

987

100

0-

--

--

--.

105

-.04

8-

--

-

0311

1150

PA19

61–1

975

150

0-

--

--

--.

135

.050

- -

- -

0311

1450

OH

1978

–198

710

00

- -

- -

- -

-.03

1-.

019

- -

- -

0311

1455

OH

1978

–198

710

00

- -

- -

- -

-.76

9-.

284

- -

- -

0311

1470

OH

1978

–198

710

00

- -

- -

- -

.400

.142

- -

- -

0311

1490

OH

1978

–198

710

00

- -

- -

- -

1.56

8.3

24-

--

-

0311

1500

OH

1942

–198

746

00

----

---.

735

-.26

1--

--03

1115

40O

H19

78–1

987

100

0--

----

-.11

8-.

047

----

0311

2000

WV

1941

–198

646

00

00

0.03

6-.

031

-.01

3-0

.014

0.90

203

1137

00W

V19

70–1

996

120

00

0.0

42-.

143

-.03

7-.

182

.451

0311

4000

OH

1927

–198

738

00

- -

- -

- -

.061

.049

- -

- -

0311

4240

OH

1978

–198

710

00

- -

- -

- -

-.25

4-.

080

- -

- -

0311

4500

WV

1916

–199

778

123

10

0.0

79.1

57.1

99.0

95.2

1903

1145

50W

V19

66–1

977

120

00

0.0

71-.

547

-.17

9.2

12.3

7303

1146

00W

V19

67–1

977

110

00

0.0

73-.

362

-.10

0-.

018

1.00

003

1146

50W

V19

69–1

997

130

00

0.0

76.0

05.0

44.2

56.2

46

0311

5280

OH

1978

–198

710

00

- -

- -

- -

1.25

7.4

04-

--

-03

1154

00O

H19

59–1

981

2375

01

- -

- -

.188

-.20

4-

--

-03

1154

10O

H19

78–1

987

100

0-

--

--

--.

667

-.21

6-

--

-03

1155

10O

H19

78–1

987

100

0-

--

--

-.9

37.3

48-

--

-03

1156

00O

H19

47–1

979

330

0-

--

--

-.1

21.0

76-

--

-

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

38 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0311

5710

OH

1978

–198

710

00

- -

- -

- -

1.18

00.

361

- -

- -

0315

0600

OH

1966

–198

015

00

- -

- -

- -

.567

.264

- -

- -

0315

1400

WV

1975

–199

721

800

e 10

0.24

7.5

21.2

730.

247

0.12

403

1515

00W

V19

39–1

973

3579

10

0.2

27-.

427

-.22

4.0

45.7

1203

1520

00W

V19

29–1

978

500

00

0.1

81-.

008

.040

-.05

0.6

16

0315

2200

WV

1970

–199

712

00

00

.171

-.15

3.0

33.1

51.5

3703

1525

00W

V19

38–1

951

140

00

0.1

73-.

597

-.15

8.4

61.0

2503

1530

00W

V19

39–1

975

370

00

1.1

66-.

878

-.20

7.0

87.4

5603

1535

00W

V19

29–1

978

500

00

0.1

47-.

354

-.20

5.0

38.7

0703

1540

00W

V19

29–1

997

630

00

0.1

41-.

200

-.11

9-.

124

.151

0315

4250

WV

1970

–199

712

00

00

.127

.044

.091

.182

.451

0315

4500

WV

1952

–197

827

00

00

.098

-.59

6-.

290

.168

.227

0315

5000

WV

1939

–197

840

00

01

.084

-.73

8-.

134

.024

.834

0315

5200

WV

1938

–195

114

00

00

.111

-.54

8-.

175

.330

.111

0315

5450

WV

1965

–199

716

00

00

.099

-.33

1-.

106

.117

.558

0315

5500

WV

1930

–199

759

00

00

.092

-.09

2-.

049

-.04

3.6

3803

1595

40O

H19

66–1

987

220

0-

--

--

-.9

82.4

63-

--

-03

1597

00W

V19

65–1

977

130

01

0.0

881.

189

.465

-.14

1.5

4103

1715

00V

A-

--

-15

0-

--

--

--

--

--

--

--

-03

1730

00V

A-

--

-11

5-

--

--

--

--

--

--

--

-

0317

5500

VA

1909

–199

162

00

- -

- -

- -

- -

- -

- -

- -

0317

6500

VA

- -

- -

150

- -

- -

- -

- -

- -

- -

- -

- -

0317

7000

WV

1942

–195

110

00

00

.381

-.40

8.0

85.1

56.5

8803

1775

00W

V19

42–1

951

100

00

1.3

66-1

.599

-.08

1.1

78.5

3003

1777

00V

A19

66–1

980

150

0--

----

----

----

0317

8500

WV

1947

–199

728

51

0f 1

0.3

35-.

122

-.05

8-.

020

.895

0317

9000

WV

1951

–199

747

00

02

.344

-1.0

00.0

35.0

92.3

6903

1795

00W

V19

09–1

948

270

00

0.3

45-.

191

.022

.217

.118

0318

0000

WV

1924

–194

825

711

10

.347

1.21

8.8

00.1

00.4

9803

1803

50W

V19

66–1

977

120

00

0.3

57.3

91.3

71.1

67.4

92

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

Table 3 39

0318

0500

WV

1944

–199

754

102

02

00.

359

1.62

40.

972

0.18

80.

046

0318

0530

WV

1966

–197

711

00

00

.370

-.15

5.1

57.2

36.3

5003

1806

80W

V19

65–1

977

130

00

0.3

78-.

134

.151

.205

.360

0318

1900

WV

1965

–197

713

00

01

.376

-.76

8.0

86-.

167

.459

0318

2000

WV

1946

–199

718

801

10

.367

1.49

9.9

01.1

24.4

95

0318

2500

WV

1930

–199

768

102

01

0.3

64.6

09.4

73.1

44.0

8403

1827

00W

V19

72–1

982

1180

10

0.3

81.7

75.6

54-.

309

.213

0318

3000

WV

1946

–199

729

00

00

.388

.107

.212

.121

.367

0318

3500

WV

1896

–199

710

20

00

0.3

64-.

223

-.12

2-.

014

.842

0318

3550

WV

1966

–197

712

00

01

.356

-1.1

36-.

089

.136

.582

0318

3570

WV

1966

–197

712

00

00

.361

.436

.392

.076

.783

0318

4000

WV

1936

–199

762

00

00

.356

.139

.190

.103

.241

0318

4500

WV

1937

–194

812

410

10

.344

.602

.041

.000

1.00

003

1850

00W

V19

52–1

982

310

00

0.3

05.3

40.3

26-.

075

.563

0318

5020

WV

1966

–197

712

00

00

.316

-.70

3-.

086

.167

.492

0318

5500

WV

1929

–194

820

00

00

.293

-.16

7.0

45-.

032

.871

0318

6000

WV

1896

–194

835

711

00

.281

-.43

4-.

128

-.04

0.7

4403

1865

00W

V19

30–1

997

680

00

0.3

01.5

22.4

63.0

58.4

8503

1870

00W

V19

30–1

997

660

00

0.2

89.2

27.2

41-.

008

.925

0318

7300

WV

1969

–199

718

00

00

.334

.637

.478

.241

.173

0318

7500

WV

1945

–199

739

661

00

.307

.436

.411

.096

.397

0318

9000

WV

1930

–198

243

710

10

.310

1.07

7.7

69.1

71.1

0903

1891

00W

V19

65–1

997

3166

21

0.2

95-.

035

.047

-.01

9.8

9203

1895

00W

V19

29–1

965

370

01

0.2

79.9

12.6

41-.

117

.314

0318

9650

WV

1966

–197

712

00

00

.287

-.51

9-.

039

.000

1.00

0

0319

0000

WV

1909

–197

151

00

00

.296

.029

.097

.073

.455

0319

0400

WV

1967

–199

729

00

00

.277

-.02

8.0

83.1

13.3

9803

1905

00W

V19

66–1

976

110

00

0.2

73-.

731

-.10

6.2

91.2

4103

1914

00W

V19

66–1

997

1652

0g 1

0.2

62.3

84.1

09.2

83.1

3703

1915

00W

V19

46–1

997

3152

0h 1

0.2

58.4

00.2

87-.

071

.586

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

40 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0319

2000

WV

1929

–196

436

551

00

0.24

20.

444

0.45

1-0

.081

0.49

603

1925

00W

V19

09–1

930

1456

21

0.2

42.4

10.0

30.3

41.0

9803

1930

00W

V18

78–1

948

710

00

0.2

53-.

075

-.00

8-.

108

.183

0319

3725

WV

1966

–197

712

00

01

.269

-.47

8.3

50.2

42.3

0103

1947

00W

V19

30–1

997

6610

20

10

.270

.769

.615

.107

.205

0319

5000

WV

1935

–196

329

00

00

.260

-.04

3.0

68.1

21.3

6703

1951

00W

V19

75–1

987

100

01

0.2

681.

062

.526

.022

1.00

003

1952

50W

V19

75–1

997

200

00

0.2

65.5

60.4

13.3

37.0

4103

1955

00W

V19

39–1

960

220

00

0.2

35-.

127

.031

.056

.735

0319

5600

WV

1966

–199

716

00

00

.233

.271

.251

.200

.300

0319

7000

WV

1929

–196

032

430

10

.191

.654

.451

-.18

1.1

4903

1971

50W

V19

66–1

977

120

00

1.1

74-1

.608

.044

-.15

2.5

3703

1979

00W

V19

64–1

975

120

00

0.1

79.3

26.2

40.0

30.9

4503

1984

50W

V19

65–1

997

170

00

0.1

96.9

49.5

19.1

47.4

3403

1985

00W

V19

09–1

997

750

00

0.1

84.1

24.1

36.0

59.4

53

0319

8780

WV

1966

–197

712

00

00

.201

-.08

7.0

77-.

152

.537

0319

8800

WV

1963

–197

714

00

00

.195

-.40

8-.

072

-.02

2.9

5603

1990

00W

V19

31–1

984

540

00

0.1

86-.

028

.024

-.02

0.8

3503

1994

00W

V19

75–1

984

100

00

0.1

71.7

28.3

72.0

67.8

5803

2005

00W

V19

09–1

997

420

00

0.1

40-.

471

-.26

2-.

082

.448

0320

0600

WV

1966

–197

712

00

01

.118

-.54

1.1

73.2

58.2

7103

2010

00W

V19

09–1

997

520

00

0.1

35-.

223

-.12

5-.

038

.693

0320

1410

WV

1967

–199

718

00

00

.108

-.06

0.0

20-.

203

.256

0320

1420

WV

1965

–197

713

00

01

.103

-1.3

07-.

270

-.34

6.1

1203

2014

40W

V19

65–1

977

130

00

0.0

58.9

95.4

02-.

026

.951

0320

1480

WV

1965

–197

713

00

00

.019

-.76

8-.

300

-.43

6.0

4403

2020

00O

H19

16–1

985

680

0-

--

--

-.3

14.2

35-

--

-03

2024

00W

V19

69–1

997

290

00

0.2

65-.

156

.003

-.15

0.2

6003

2024

80W

V19

70–1

997

120

00

0.2

68.0

86.1

90-.

061

.837

0320

2750

WV

1975

–199

723

00

01

.255

-1.1

11.2

06-.

107

.492

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

Table 3 41

0320

3000

WV

1929

–197

951

00

00

0.22

3-0

.413

-0.2

220.

064

0.51

603

2036

00W

V19

61–1

979

190

00

0.2

00-.

641

-.20

8.0

94.6

0003

2040

00W

V19

16–1

979

5873

11

0.1

07-.

637

-.43

0.0

65.4

7703

2045

00W

V19

38–1

980

4370

12

0.0

93.4

62.3

45.0

78.4

7003

2059

95O

H19

78–1

987

100

0-

--

--

-.7

45.2

88-

--

-

0320

6600

WV

1965

–199

733

00

01

.124

-.15

6.2

82.1

82.1

4103

2068

00W

V19

62–1

971

1059

11

0.0

88.7

34.2

48-.

156

.591

0320

7000

WV

1916

–196

631

591

00

.068

-.13

8.0

12-.

138

.284

0320

7020

WV

1916

–197

136

591

00

.066

-.18

5-.

010

-.10

8.3

6103

2074

00V

A-

--

-40

- -

- -

- -

- -

- -

- -

- -

- -

0320

7500

VA

1929

–199

142

00

- -

- -

- -

- -

- -

- -

- -

0320

7800

VA

- -

- -

63-

--

--

--

--

--

--

--

-03

2079

62K

Y19

75–1

984

100

0-

--

--

--.

442

-.04

8-

--

-03

2080

00K

Y19

38–1

968

3010

70

i 1--

---.

134

-.17

7--

--03

2085

00V

A19

27–1

991

650

0--

----

----

----

0320

8950

VA

--65

----

----

----

----

--03

2090

00V

A-

--

-75

- -

- -

- -

- -

- -

- -

- -

- -

0320

9575

KY

1976

–198

510

00

- -

- -

- -

1.46

0.4

78-

--

-03

2100

00K

Y19

38–1

985

460

0-

--

--

--.

541

-.30

8-

--

-03

2115

00K

Y19

38–1

949

1232

2-

--

--

--1

.027

-.13

0-

--

-

0321

2000

KY

1950

–198

132

00

- -

- -

- -

-.61

5-.

343

- -

- -

0321

2750

WV

1986

–199

712

00

01

.287

-.72

7.1

22.1

82.4

5103

2129

80W

V19

86–1

997

120

00

1.2

69-2

.111

-.13

5.2

73.2

4403

2130

00W

V19

31–1

986

560

00

0.2

55-.

276

-.13

4.0

62.5

0603

2135

00W

V19

47–1

985

390

00

0.2

56-.

353

-.14

5.1

62.1

50

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

42 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

a H

igh-

outli

er th

resh

old

was

set t

o 36

,000

cub

ic fe

et p

er se

cond

.b

Hig

h-ou

tlier

thre

shol

d w

as se

t to

60,0

00 c

ubic

feet

per

seco

nd.

c H

igh-

outli

er th

resh

old

was

set t

o 17

,000

cub

ic fe

et p

er se

cond

.d

Hig

h-ou

tlier

thre

shol

d w

as se

t to

41,0

00 c

ubic

feet

per

seco

nd.

e H

igh-

outli

er th

resh

old

was

set t

o 19

,000

cub

ic fe

et p

er se

cond

.f H

igh-

outli

er th

resh

old

was

set t

o 5,

600

cubi

c fe

et p

er se

cond

.g

Hig

h-ou

tlier

thre

shol

d w

as se

t to

1,90

0 cu

bic

feet

per

seco

nd.

h H

igh-

outli

er th

resh

old

was

set t

o 11

,000

cub

ic fe

et p

er se

cond

.i H

igh-

outli

er th

resh

old

was

set t

o 32

,000

cub

ic fe

et p

er se

cond

.j H

igh-

outli

er th

resh

old

was

set t

o 24

,000

cub

ic fe

et p

er se

cond

.

0321

3700

WV

1968

–199

730

00

01

0.16

9-0

.328

0.24

7-0

.060

0.65

603

2140

00W

V19

35–1

985

510

00

0.1

33.0

06.0

38.1

23.2

0503

2145

00W

V19

16–1

997

710

00

1.1

27-.

145

.126

-.01

2.8

8903

2149

00W

V19

77–1

995

120

00

0.0

87.2

04.1

36-.

182

.451

0321

5500

KY

1916

–198

452

00

- -

- -

- -

.140

.113

- -

- -

0321

6500

KY

1937

–196

730

840

j 1-

--

--.

523

.065

- -

- -

0321

6540

KY

1973

–198

513

00

- -

- -

- -

.726

.310

- -

- -

0321

6563

KY

1976

–198

510

00

- -

- -

- -

-1.1

44.1

81-

--

-

Tab

le 3

. Pea

k-di

scha

rge

stat

istic

s fr

om th

e fr

eque

ncy

anal

ysis

of t

he g

agin

g st

atio

n’s

syst

emat

ic a

nd h

isto

rical

rec

ord

used

to d

evel

op lo

w-r

ecur

renc

e-in

terv

al p

eak-

disc

harg

e es

timat

ing

equa

tions

for

rura

l, un

regu

late

d st

ream

s in

Wes

t Virg

inia

—C

ontin

ued

[MD

, Mar

ylan

d; O

H, O

hio;

PA

, Pen

nsyl

vani

a; V

A, V

irgi

nia;

WV

, Wes

t Vir

gini

a; -

-, in

form

atio

n no

t ava

ilabl

e]

Sta

tio

nN

o.

Sta

te

Wat

er y

ears

b

ou

nd

ing

syst

emat

icp

eaks

Nu

mb

er o

f ye

ars

of

reco

rdN

um

ber

of

pea

ksS

kew

Tren

d a

nal

ysis

Sys

tem

atic

His

tori

cal

His

tori

cal

Hig

ho

utl

ier

Low

ou

tlie

rG

ener

al-

ized

Sys

tem

atic

Wei

gh

ted

Ken

dal

l’s

tau

Sig

nif

ican

cele

vel

Table 3 43

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

0159

5000

Nor

th B

ranc

h Po

tom

ac

Riv

er a

t Ste

yer,

MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

3,32

0-

--

-

0159

5300

Abr

am C

reek

at O

akm

ont,

WV

Eas

t S

R W

800

724

797

882

871

881

944

981

946

998

1,07

01,

000

1,05

01,

160

1,05

0

1,09

01,

230

1,10

0

1,13

01,

300

1,14

0

1,17

01,

360

1,18

0

1,21

01,

420

1,22

0

1,24

01,

480

1,25

0

1,39

01,

720

1,41

0

1,49

01,

890

1,51

001

5955

00N

orth

Bra

nch

Poto

mac

R

iver

at K

itzm

iller

, MD

Eas

t S

-

--

--

--

--

--

--

--

--

-7,

470

- -

- -

0159

6000

Nor

th B

ranc

h Po

tom

ac

Riv

er a

t Blo

omin

gton

, M

D

Eas

t S

-

--

--

--

--

--

--

--

--

-8,

040

- -

- -

0159

6500

Sav

age

Riv

er n

ear

Bar

ton,

M

DE

ast

S

- -

- -

- -

- -

- -

- -

- -

- -

- -

1,46

0-

--

-

0159

7000

Cra

btre

e C

reek

nea

r

Swan

ton,

MD

Eas

t S

-

--

--

--

--

--

--

--

--

-48

4-

--

-

0159

8000

Sava

ge R

iver

at

Blo

omin

gton

, MD

Eas

t S

-

--

--

--

--

--

--

--

--

-3,

450

- -

- -

0159

9000

Geo

rges

Cre

ek a

t Fr

ankl

in, M

DE

ast

S

- -

- -

- -

- -

- -

- -

- -

- -

- -

1,86

0-

--

-

0159

9500

New

Cre

ek n

ear

Key

ser,

WV

Eas

t S

R W

405

779

421

526

937

547

620

1,06

064

4

699

1,16

072

7

769

1,25

079

9

832

1,33

086

5

889

1,40

092

5

943

1,47

098

0

992

1,53

01,

030

1,04

01,

590

1,08

0

1,24

01,

850

1,29

0

1,40

02,

040

1,46

001

6000

00N

orth

Bra

nch

Poto

mac

R

iver

at P

into

, MD

Eas

t S

-

--

--

--

--

--

--

--

--

-16

,100

- -

- -

0160

1500

Wil

ls C

reek

nea

r C

umbe

rlan

d, M

DE

ast

S

- -

- -

- -

- -

- -

- -

- -

- -

- -

5,93

0-

-- -

0160

3000

Nor

th B

ranc

h Po

tom

ac

Riv

er n

ear

Cum

berl

and,

M

D

Eas

t S

-

--

--

--

--

--

--

--

--

-17

,700

- -

- -

0160

4500

Patte

rson

Cre

ek n

ear

Hea

dsvi

lle, W

VE

ast

S

R W

1,52

02,

750

1,54

0

1,98

03,

310

2,01

0

2,34

03,

740

2,37

0

2,65

04,

100

2,68

0

2,91

04,

420

2,95

0

3,16

04,

710

3,20

0

3,38

04,

970

3,42

0

3,58

05,

220

3,63

0

3,77

05,

450

3,82

0

3,95

05,

670

4,00

0

4,71

06,

610

4,78

0

5,34

07,

300

5,42

001

6055

00So

uth

Bra

nch

Pot

omac

R

iver

at F

rank

lin,

WV

Eas

t S

R W

1,93

02,

400

1,94

0

2,40

02,

890

2,41

0

2,76

03,

260

2,77

0

3,07

03,

570

3,09

0

3,35

03,

850

3,37

0

3,61

04,

100

3,63

0

3,84

04,

330

3,86

0

4,07

04,

550

4,09

0

4,28

04,

750

4,30

0

4,48

04,

940

4,50

0

5,36

05,

750

5,38

0

6,02

06,

350

6,03

0

44 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0160

5700

Ree

ds C

reek

Tri

buta

ry

near

Fra

nklin

, WV

Eas

t S R W

10.7

17.8

11.1

12.6

21.2

13.2

14.1

23.8

14.8

15.3

26.0

16.1

16.3

27.9

17.3

17.2

29.7

18.3

18.1

31.2

19.2

18.9

32.7

20.1

19.6

34.0

20.9

20.3

35.3

21.7

23.2

40.7

25.0

25.3

44.7

27.4

0160

6000

Nor

th F

ork

Sout

h B

ranc

h Po

tom

ac R

iver

at

Cab

ins,

WV

Eas

t S

R W

4,47

04,

040

4,46

0

5,19

04,

870

5,18

0

5,74

05,

500

5,74

0

6,22

06,

040

6,21

0

6,65

06,

510

6,64

0

7,03

06,

940

7,03

0

7,39

07,

330

7,39

0

7,73

07,

690

7,73

0

8,05

08,

040

8,05

0

8,34

08,

360

8,34

0

9,67

09,

760

9,67

0

10,6

0010

,800

10,6

00

0160

6500

Sout

h B

ranc

h P

otom

ac

Riv

er n

ear

Pet

ersb

urg,

W

V

Eas

t S

R W

6,40

07,

260

6,42

0

7,59

08,

760

7,61

0

8,51

09,

900

8,54

0

9,30

010

,900

9,34

0

10,0

0011

,700

10,1

00

10,7

0012

,500

10,7

00

11,3

0013

,200

11,3

00

11,9

0013

,900

11,9

00

12,4

0014

,500

12,5

00

12,9

0015

,100

13,0

00

15,2

0017

,600

15,2

00

16,8

0019

,500

16,8

0001

6068

00B

rush

y R

un n

ear

Pete

rsbu

rg, W

VE

ast

S

R W

13.8

42.0

15.1

18.1

50.2

19.9

21.7

56.4

23.9

24.8

61.6

27.3

27.7

66.2

30.5

30.4

70.3

33.5

32.9

74.0

36.2

35.3

77.5

38.9

37.5

80.8

41.3

39.7

83.8

43.7

49.6

96.8

54.4

57.3

106.

062

.7

0160

7500

Sou

th F

ork

Sou

th B

ranc

h Po

tom

ac R

iver

at

Bra

ndyw

ine,

WV

Eas

t S

R W

1,51

01,

510

1,51

0

1,86

01,

820

1,86

0

2,14

02,

050

2,14

0

2,38

02,

250

2,38

0

2,61

02,

420

2,61

0

2,82

02,

580

2,81

0

3,01

02,

720

3,01

0

3,20

02,

860

3,19

0

3,38

02,

980

3,37

0

3,55

03,

100

3,53

0

4,32

03,

610

4,29

0

4,88

03,

990

4,84

001

6080

00S

outh

For

k S

outh

Bra

nch

Poto

mac

Riv

er n

ear

Moo

refi

eld,

WV

Eas

t S

R W

2,80

03,

450

2,81

0

3,41

04,

160

3,43

0

3,88

04,

700

3,90

0

4,30

05,

150

4,32

0

4,67

05,

550

4,70

0

5,02

05,

920

5,04

0

5,34

06,

250

5,36

0

5,64

06,

560

5,67

0

5,93

06,

850

5,96

0

6,20

07,

120

6,23

0

7,43

08,

310

7,46

0

8,31

09,

180

8,34

0

0160

8100

Wil

liam

s H

ollo

w n

ear

Moo

refi

eld,

WV

Eas

t S

R W

30.2 8.2

27.5

34.0 9.8

30.6

36.6

11.1

32.8

38.6

12.1

34.5

40.4

13.0

36.0

41.9

13.8

37.2

43.2

14.5

38.4

44.4

15.1

39.4

45.4

15.8

40.3

46.4

16.3

41.1

50.5

18.8

44.6

53.4

20.6

47.2

0160

8500

Sout

h B

ranc

h P

otom

ac

Riv

er n

ear

Spri

ngfi

eld,

W

V

Eas

t S

R W

10,4

0014

,000

10,5

00

12,7

0016

,900

12,8

00

14,5

0019

,100

14,6

00

16,1

0021

,000

16,2

00

17,5

0022

,700

17,6

00

18,8

0024

,200

18,9

00

20,0

0025

,600

20,1

00

21,1

0026

,900

21,2

00

22,1

0028

,100

22,3

00

23,1

0029

,200

23,3

00

27,6

0034

,200

27,7

00

30,8

0037

,800

31,0

00

0160

9000

Tow

n C

reek

nea

r Old

tow

n,

MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

3,80

0-

--

-

0160

9500

Saw

pit R

un n

ear

Old

tow

n,

MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

262

- -

- -

0160

9800

Litt

le C

acap

on R

iver

nea

r L

evel

s, W

VE

ast

S

R W

2,03

01,

570

1,98

0

2,39

01,

890

2,32

0

2,66

02,

140

2,58

0

2,88

02,

340

2,79

0

3,07

02,

520

2,98

0

3,24

02,

690

3,15

0

3,40

02,

830

3,30

0

3,54

02,

980

3,44

0

3,67

03,

110

3,57

0

3,80

03,

230

3,69

0

4,33

03,

760

4,22

0

4,72

04,

150

4,60

0

0161

0000

Poto

mac

Riv

er a

t Paw

Pa

w, W

VE

ast1

S-

--

--

--

--

--

--

--

--

-44

,700

- -

- -

0161

0150

Bea

r C

reek

at F

ores

t Par

k,

MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

378

- -

- -

0161

0155

Side

ling

Hill

Cre

ek a

t B

elle

grov

e, M

DE

ast

S-

--

--

--

--

--

--

--

--

-4,

450

- -

- -

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 45

0161

0500

Cac

apon

Riv

er a

t Yel

low

Sp

ring

, WV

Eas

t S

R W

2,50

03,

750

2,60

0

3,35

04,

520

3,46

0

4,04

05,

100

4,15

0

4,64

05,

600

4,74

0

5,18

06,

040

5,28

0

5,68

06,

430

5,77

0

6,14

06,

790

6,23

0

6,58

07,

130

6,65

0

6,99

07,

450

7,06

0

7,39

07,

740

7,44

0

9,13

09,

040

9,12

0

10,6

009,

980

10,5

0001

6115

00C

acap

on R

iver

nea

r G

reat

C

acap

on, W

VE

ast

S

R W

5,06

07,

250

5,09

0

6,64

08,

750

6,68

0

7,88

09,

890

7,92

0

8,94

010

,900

8,98

0

9,88

011

,700

9,92

0

10,7

0012

,500

10,8

00

11,5

0013

,200

11,6

00

12,2

0013

,900

12,3

00

12,9

0014

,500

13,0

00

13,6

0015

,100

13,6

00

16,3

0017

,600

16,4

00

18,6

0019

,500

18,6

00

0161

2500

Litt

le T

onol

oway

Cre

ek

near

Han

cock

, MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

520

- -

- -

0161

3000

Poto

mac

Riv

er a

t H

anco

ck, M

DE

ast

S-

--

--

--

--

--

--

--

--

-55

,500

- -

- -

0161

3150

Dit

ch R

un n

ear

Han

cock

, M

DE

ast

S-

--

--

--

--

--

--

--

--

-23

8-

--

-

0161

3160

Poto

mac

Riv

er T

ribu

tary

ne

ar H

anco

ck, M

DE

ast

S-

--

--

--

--

--

--

--

--

-10

5-

--

-

0161

3900

Hog

ue C

reek

nea

r H

ayfi

eld,

VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

838

- -

- -

0161

4000

Bac

k C

reek

nea

r Jo

nes

Spri

ngs,

WV

Eas

t S

R W

2,80

03,

010

2,81

0

3,34

03,

620

3,35

0

3,74

04,

090

3,76

0

4,09

04,

490

4,10

0

4,39

04,

840

4,41

0

4,66

05,

150

4,68

0

4,91

05,

440

4,93

0

5,14

05,

710

5,17

0

5,36

05,

970

5,39

0

5,57

06,

200

5,60

0

6,45

07,

240

6,49

0

7,10

07,

990

7,15

001

6150

00O

pequ

on C

reek

nea

r B

erry

ville

, VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

2,20

0-

--

-

0161

6000

Abr

ams

Cre

ek n

ear

Win

ches

ter,

VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

483

- -

- -

0161

6500

Ope

quon

Cre

ek n

ear

Mar

tins

burg

, WV

Eas

t S

R W

1,86

03,

410

1,89

0

2,38

04,

110

2,42

0

2,78

04,

640

2,82

0

3,12

05,

090

3,17

0

3,43

05,

490

3,49

0

3,71

05,

840

3,78

0

3,97

06,

170

4,04

0

4,21

06,

480

4,29

0

4,44

06,

770

4,52

0

4,65

07,

040

4,74

0

5,60

08,

210

5,70

0

6,34

09,

070

6,46

0

0161

7000

Tus

caro

ra C

reek

abo

ve

Mar

tins

burg

, WV

Eas

t2 S

8098

110

121

131

140

148

155

162

168

197

217

0161

8000

Poto

mac

Riv

er a

t Sh

ephe

rdst

own,

MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

72,2

00-

--

-

0161

9500

Ant

ieta

m C

reek

nea

r Sh

arps

burg

, MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

2,56

0-

--

-

0162

0500

Nor

th R

iver

nea

r St

okes

ville

, VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

668

- -

- -

0162

1000

Dry

Riv

er a

t Raw

ley

Spri

ngs,

VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

2,26

0-

--

-

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

46 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0162

1200

War

Bra

nch

near

Hin

ton,

V

AE

ast

S-

--

--

--

--

--

--

--

--

-55

0-

--

-

0162

1400

Bla

cks

Run

at

Har

riso

nbur

g, V

AE

ast

S-

--

--

--

--

--

--

--

--

-46

9-

--

-

0162

1450

Bla

cks

Run

Tri

buta

ry n

ear

Har

riso

nbur

g, V

AE

ast

S-

--

--

--

--

--

--

--

--

-40

.8-

--

-

0162

2000

Nor

th R

iver

nea

r B

urke

tow

n, V

AE

ast

S-

--

--

--

--

--

--

--

--

-7,

020

- -

- -

0162

2100

Nor

th R

iver

Tri

buta

ry a

t M

ount

Cra

wfo

rd, V

AE

ast

S-

--

--

--

--

--

--

--

--

-58

.5-

--

-

0162

2300

Buf

falo

Bra

nch

Tri

buta

ry

near

Aug

usta

Spr

ings

, V

A

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

54.7

- -

- -

0162

2400

Buf

falo

Bra

nch

Tri

buta

ry

near

Chr

istia

n, V

AE

ast

S-

--

--

--

--

--

--

--

--

-51

.3-

--

-

0163

2000

Nor

th F

ork

Shen

ando

ah

Riv

er a

t Coo

tes

Stor

e,

VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

8,21

0-

--

-

0163

2300

Lon

g M

eado

w n

ear

Bro

adw

ay, V

AE

ast

S-

--

--

--

--

--

--

--

--

-13

2-

--

-

0163

2900

Smith

Cre

ek n

ear

New

M

arke

t, V

AE

ast

S-

--

--

--

--

--

--

--

--

-2,

160

- -

- -

0163

2950

Cro

oked

Run

Tri

buta

ry

near

Con

icvi

lle, V

AE

ast

S-

--

--

--

--

--

--

--

--

-22

.7-

--

-

0163

2970

Cro

oked

Run

nea

r M

ount

Ja

ckso

n, V

AE

ast

S-

--

--

--

--

--

--

--

--

-73

5-

--

-

0163

3000

Nor

th F

ork

Shen

ando

ah

Riv

er a

t Mou

nt J

acks

on,

VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

10,3

00-

--

-

0163

3500

Ston

y C

reek

at C

olum

bia

Furn

ace,

VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

2,05

0-

--

-

0163

3650

Pugh

s R

un n

ear

Woo

dsto

ck, V

AE

ast

S-

--

--

--

--

--

--

--

--

-11

4-

--

-

0163

4000

Nor

th F

ork

Shen

ando

ah

Riv

er n

ear

Stra

sbur

g,

VA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

11,2

00-

--

-

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 47

0163

4500

Ced

ar C

reek

nea

r W

inch

este

r, V

AE

ast

S-

--

--

--

--

--

--

--

--

-3,

110

- -

- -

0163

6500

Shen

ando

ah R

iver

at

Mil

lvill

e, W

VE

ast2

S13

,700

17,4

0020

,400

22,8

0025

,000

27,0

0028

,800

30,5

0032

,100

33,6

0040

,100

45,2

00

0201

1480

Bac

k C

reek

at R

oute

600

ne

ar M

ount

ain

Gro

ve,

VA

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

4,37

0-

--

-

0201

1500

Bac

k C

reek

nea

r Mou

ntai

n G

rove

, VA

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

5,94

0-

--

-

0201

2500

Jack

son

Riv

er a

t Fal

ling

Spri

ng, V

ASo

uth

S-

--

--

--

--

--

--

--

--

-10

,300

- -

- -

0201

3000

Dun

lap

Cre

ek n

ear

Cov

ingt

on, V

ASo

uth

S-

--

--

--

--

--

--

--

--

-5,

060

- -

- -

0201

4000

Potts

Cre

ek n

ear

Cov

ingt

on, V

ASo

uth

S-

--

--

--

--

--

--

--

--

-3,

800

- -

- -

0305

0000

Tyga

rt V

alle

y R

iver

nea

r D

aile

y, W

VN

orth

S

R W

4,16

03,

550

4,14

0

4,69

04,

100

4,67

0

5,07

04,

490

5,06

0

5,38

04,

800

5,37

0

5,65

05,

070

5,64

0

5,89

05,

310

5,87

0

6,10

05,

510

6,08

0

6,30

05,

700

6,28

0

6,48

05,

880

6,46

0

6,64

06,

040

6,62

0

7,34

06,

690

7,32

0

7,83

07,

190

7,82

0

0305

0500

Tyga

rt V

alle

y R

iver

nea

r E

lkin

s, W

VN

orth

S

R W

4,91

04,

790

4,91

0

5,42

05,

500

5,43

0

5,79

06,

000

5,79

0

6,08

06,

400

6,09

0

6,33

06,

740

6,35

0

6,55

07,

030

6,57

0

6,75

07,

290

6,77

0

6,93

07,

530

6,95

0

7,09

07,

750

7,11

0

7,24

07,

950

7,27

0

7,87

08,

770

7,91

0

8,31

09,

390

8,35

003

0506

50L

eadi

ng C

reek

Tri

buta

ry

near

Gilm

an, W

VN

orth

S

R W

13.4

28.0

16.4

18.7

36.1

22.8

23.0

42.5

27.9

26.9

48.0

32.4

30.5

52.9

36.5

33.8

57.3

40.3

37.0

61.4

43.7

40.0

65.3

47.0

42.8

68.8

50.2

45.6

72.2

53.1

57.9

87.0

66.3

68.3

98.9

77.0

0305

1000

Tyga

rt V

alle

y R

iver

at

Bel

ingt

on, W

VN

orth

S

R W

6,79

06,

590

6,78

0

7,55

07,

510

7,55

0

8,09

08,

150

8,09

0

8,52

08,

670

8,52

0

8,88

09,

100

8,89

0

9,20

09,

480

9,20

0

9,48

09,

810

9,48

0

9,73

010

,100

9,74

0

9,96

010

,400

9,97

0

10,2

0010

,600

10,2

00

11,0

0011

,700

11,1

00

11,7

0012

,400

11,7

0003

0515

00M

iddl

e Fo

rk R

iver

at

Mid

vale

, WV

Nor

thS

R W

2,73

02,

550

2,72

0

3,18

02,

970

3,17

0

3,51

03,

270

3,50

0

3,78

03,

510

3,77

0

4,01

03,

720

4,00

0

4,22

03,

900

4,20

0

4,40

04,

060

4,38

0

4,57

04,

210

4,55

0

4,72

04,

350

4,70

0

4,87

04,

470

4,84

0

5,47

04,

990

5,44

0

5,92

05,

380

5,89

0

0305

2000

Mid

dle

Fork

Riv

er a

t A

udra

, WV

Nor

thS

R W

3,52

02,

970

3,50

0

4,04

03,

450

4,01

0

4,42

03,

790

4,39

0

4,72

04,

060

4,69

0

4,99

04,

300

4,96

0

5,22

04,

500

5,19

0

5,43

04,

680

5,39

0

5,62

04,

850

5,58

0

5,79

05,

000

5,75

0

5,95

05,

140

5,91

0

6,63

05,

720

6,59

0

7,12

06,

150

7,08

0

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

48 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0305

2340

Mud

Lic

k R

un n

ear

Buc

khan

non,

WV

Nor

thS

R W

118

111

116

126

139

130

132

160

141

136

178

149

140

194

157

144

208

163

147

221

169

149

233

174

152

245

179

154

255

183

163

300

201

169

336

213

0305

2500

San

d R

un n

ear

Buc

khan

non,

WV

Nor

thS

R W

395

470

398

470

569

475

526

643

533

573

703

581

615

756

623

652

802

661

685

845

695

716

883

727

745

919

756

772

953

784

889

1,09

090

2

975

1,20

098

9

0305

3500

Buc

khan

non

Riv

er n

ear

Hal

l, W

VN

orth

S

R W

4,72

04,

880

4,73

0

5,39

05,

590

5,39

0

5,84

06,

100

5,85

0

6,19

06,

500

6,20

0

6,49

06,

850

6,50

0

6,74

07,

150

6,75

0

6,96

07,

410

6,97

0

7,15

07,

650

7,17

0

7,33

07,

870

7,34

0

7,49

08,

070

7,50

0

8,14

08,

910

8,15

0

8,64

09,

530

8,66

003

0545

00Ty

gart

Val

ley

Riv

er a

t Ph

illip

i, W

VN

orth

S

R W

14,0

0012

,500

13,9

00

15,7

0014

,000

15,7

00

17,0

0015

,100

16,9

00

18,0

0015

,900

17,9

00

18,8

0016

,600

18,8

00

19,6

0017

,200

19,5

00

20,3

0017

,800

20,2

00

20,9

0018

,300

20,8

00

21,4

0018

,700

21,3

00

21,9

0019

,100

21,8

00

24,0

0020

,700

23,9

00

25,5

0021

,900

25,4

00

0305

5020

Bon

ica

Run

on

U.S

. 250

ne

ar P

hilli

pi, W

VN

orth

S

R W

29.9

38.5

32.2

37.5

49.4

40.9

43.2

57.9

47.6

47.9

65.1

53.2

52.1

71.5

58.1

55.8

77.3

62.5

59.1

82.7

66.5

62.2

87.7

70.2

65.0

92.4

73.6

67.6

96.8

76.8

78.8

116.

090

.3

87.8

131.

010

1.0

0305

5040

Bon

ica

Run

on

Rou

te 3

8 ne

ar P

hilli

pi, W

VN

orth

S

R W

96 144

105

118

180

130

134

206

149

148

229

166

161

248

180

172

266

193

182

282

204

192

297

215

201

311

225

209

324

234

245

379

275

272

423

305

0305

6250

Thr

ee F

ork

Cre

ek n

ear

Gra

fton

, WV

Nor

thS

R W

2,59

02,

130

2,52

0

3,02

02,

490

2,94

0

3,34

02,

750

3,24

0

3,60

02,

950

3,49

0

3,82

03,

130

3,70

0

4,02

03,

290

3,89

0

4,20

03,

430

4,06

0

4,36

03,

560

4,22

0

4,52

03,

670

4,36

0

4,66

03,

780

4,49

0

5,25

04,

230

5,06

0

5,68

04,

570

5,48

003

0565

00Ty

gart

Val

ley

Riv

er a

t Fe

tterm

an, W

VN

orth

S

R W

19,8

0016

,600

19,7

00

22,3

0018

,500

22,2

00

24,1

0019

,800

23,9

00

25,5

0020

,800

25,3

00

26,7

0021

,700

26,5

00

27,8

0022

,400

27,5

00

28,7

0023

,100

28,4

00

29,6

0023

,700

29,3

00

30,3

0024

,200

30,0

00

31,0

0024

,700

30,7

00

34,0

0026

,700

33,6

00

36,1

0028

,100

35,7

00

0305

6600

Rig

ht F

ork

Wic

kwir

e R

un

near

Gra

fton

, WV

Nor

thS

R W

100

112

103

122

141

127

138

162

144

151

180

159

162

196

171

172

210

182

181

223

192

189

236

202

197

247

210

204

257

218

233

303

251

256

339

277

0305

7300

Wes

t For

k R

iver

at

Wal

kers

ville

, WV

Nor

thS

R W

842

817

838

999

977

995

1,11

01,

090

1,11

0

1,21

01,

190

1,20

0

1,29

01,

270

1,29

0

1,36

01,

350

1,36

0

1,42

01,

410

1,42

0

1,48

01,

470

1,48

0

1,54

01,

530

1,53

0

1,59

01,

580

1,59

0

1,80

01,

790

1,80

0

1,96

01,

960

1,96

003

0575

00Sk

in C

reek

nea

r B

row

nsvi

lle, W

VN

orth

S

R W

854

747

847

958

895

954

1,03

01,

000

1,03

0

1,09

01,

090

1,09

0

1,13

01,

170

1,13

0

1,17

01,

240

1,18

0

1,20

01,

300

1,21

0

1,24

01,

350

1,24

0

1,26

01,

410

1,27

0

1,29

01,

450

1,30

0

1,39

01,

660

1,41

0

1,47

01,

810

1,49

0

0305

8000

Wes

t For

k R

iver

at

Bro

wns

ville

, WV

Nor

thS

R W

1,91

02,

200

1,92

0

2,19

02,

570

2,21

0

2,39

02,

840

2,41

0

2,55

03,

050

2,58

0

2,69

03,

230

2,72

0

2,81

03,

390

2,84

0

2,92

03,

540

2,95

0

3,01

03,

670

3,05

0

3,10

03,

790

3,14

0

3,18

03,

900

3,22

0

3,52

04,

360

3,56

0

3,77

04,

710

3,81

003

0585

00W

est F

ork

Riv

er a

t B

utch

ervi

lle, W

VN

orth

S

R W

3,44

03,

490

3,44

0

4,03

04,

030

4,03

0

4,44

04,

420

4,44

0

4,78

04,

730

4,77

0

5,05

04,

990

5,05

0

5,30

05,

220

5,30

0

5,51

05,

430

5,51

0

5,71

05,

610

5,71

0

5,89

05,

780

5,88

0

6,05

05,

940

6,05

0

6,72

06,

590

6,71

0

7,23

07,

080

7,23

0

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 49

0305

9000

Wes

t For

k R

iver

at

Cla

rksb

urg,

WV

Nor

thS

R W

6,20

06,

310

6,20

0

7,11

07,

190

7,11

0

7,74

07,

820

7,74

0

8,22

08,

310

8,23

0

8,62

08,

730

8,63

0

8,97

09,

090

8,97

0

9,27

09,

420

9,28

0

9,54

09,

710

9,54

0

9,78

09,

970

9,79

0

10,0

0010

,200

10,0

00

10,9

0011

,200

10,9

00

11,6

0012

,000

11,6

0003

0595

00E

lk C

reek

at Q

uiet

Del

l, W

VN

orth

S

R W

1,19

01,

910

1,23

0

1,48

02,

240

1,53

0

1,70

02,

480

1,75

0

1,88

02,

670

1,94

0

2,04

02,

830

2,10

0

2,18

02,

980

2,24

0

2,31

03,

110

2,37

0

2,43

03,

230

2,49

0

2,54

03,

330

2,60

0

2,64

03,

430

2,70

0

3,07

03,

850

3,14

0

3,42

04,

160

3,48

0

0306

0500

Sale

m F

ork

at S

alem

, WV

Nor

thS

R W

318

306

316

414

374

407

488

425

476

551

467

534

605

504

585

655

537

631

700

567

673

742

594

711

780

620

747

817

643

781

973

744

925

1,10

082

21,

040

0306

1000

Wes

t For

k R

iver

at

Ent

erpr

ise,

WV

Nor

thS

R W

10,0

0010

,800

10,1

00

11,8

0012

,200

11,8

00

13,0

0013

,100

13,0

00

13,9

0013

,900

13,9

00

14,7

0014

,500

14,7

00

15,4

0015

,000

15,4

00

16,1

0015

,500

16,0

00

16,6

0015

,900

16,6

00

17,1

0016

,300

17,1

00

17,6

0016

,700

17,6

00

19,5

0018

,200

19,5

00

21,0

0019

,300

20,9

00

0306

1500

Buf

falo

Cre

ek a

t B

arra

ckvi

lle,

WV

Nor

thS

R W

3,31

02,

450

3,28

0

3,76

02,

860

3,73

0

4,06

03,

150

4,03

0

4,31

03,

380

4,28

0

4,51

03,

580

4,48

0

4,69

03,

760

4,65

0

4,84

03,

920

4,81

0

4,98

04,

060

4,95

0

5,11

04,

190

5,07

0

5,22

04,

310

5,19

0

5,69

04,

810

5,66

0

6,04

05,

190

6,01

003

0624

00C

obun

Cre

ek a

t M

orga

ntow

n, W

VN

orth

S

R W

246

382

256

294

465

307

330

527

346

360

578

379

388

622

408

413

661

435

436

697

459

457

730

482

477

760

503

496

788

523

580

908

609

639

1,00

067

1

0306

2500

Dec

kers

Cre

ek a

t M

orga

ntow

n, W

VN

orth

S

R W

754

1,52

078

6

914

1,79

095

7

1,04

01,

990

1,09

0

1,14

02,

150

1,19

0

1,23

02,

280

1,29

0

1,31

02,

400

1,38

0

1,39

02,

510

1,45

0

1,46

02,

610

1,53

0

1,52

02,

700

1,59

0

1,59

02,

780

1,66

0

1,85

03,

130

1,93

0

2,05

03,

400

2,13

003

0639

50Jo

b R

un n

ear

Wym

er, W

VE

ast

S

R W

28.0

34.3

28.5

34.1

41.0

34.8

39.0

46.1

39.7

43.3

50.3

44.0

47.2

54.1

47.9

50.7

57.4

51.5

54.1

60.5

54.8

57.3

63.3

58.0

60.3

65.9

61.0

63.1

68.4

63.8

76.1

79.0

76.5

85.3

86.9

85.6

0306

5000

Dry

For

k at

Hen

dric

ks,

WV

Eas

t S

R W

7,61

04,

190

7,50

0

8,59

05,

040

8,46

0

9,32

05,

700

9,18

0

9,95

06,

250

9,80

0

10,5

006,

740

10,4

00

11,0

007,

180

10,8

00

11,5

007,

580

11,3

00

11,9

007,

960

11,7

00

12,3

008,

320

12,1

00

12,7

008,

650

12,5

00

14,4

0010

,100

14,2

00

15,5

0011

,200

15,3

0003

0660

00B

lack

wat

er R

iver

at D

avis

, W

VE

ast

S

R W

1,49

01,

300

1,48

0

1,69

01,

560

1,69

0

1,84

01,

760

1,84

0

1,97

01,

930

1,97

0

2,08

02,

080

2,08

0

2,18

02,

220

2,18

0

2,27

02,

340

2,27

0

2,35

02,

450

2,35

0

2,43

02,

560

2,43

0

2,50

02,

660

2,50

0

2,81

03,

100

2,82

0

3,02

03,

420

3,03

0

0306

8610

Tayl

or R

un a

t Bow

den,

W

VE

ast

S

R W

128

123

127

151

148

150

168

166

167

181

182

181

193

195

194

204

208

204

213

219

214

222

229

223

230

239

231

237

248

239

268

288

271

292

317

295

0306

9000

Shav

ers

Fork

at P

arso

ns,

WV

Eas

t S

R W

5,82

02,

770

5,74

0

6,43

03,

340

6,34

0

6,88

03,

770

6,78

0

7,25

04,

130

7,15

0

7,57

04,

460

7,47

0

7,86

04,

750

7,76

0

8,12

05,

010

8,01

0

8,36

05,

260

8,25

0

8,58

05,

490

8,48

0

8,79

05,

710

8,68

0

9,68

06,

660

9,56

0

10,3

007,

360

10,1

00

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

50 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0306

9500

Che

at R

iver

nea

r Pa

rson

s,

WV

Eas

t S

R W

15,3

007,

670

15,2

00

17,1

009,

260

16,9

00

18,5

0010

,500

18,3

00

19,6

0011

,500

19,4

00

20,6

0012

,400

20,4

00

21,5

0013

,200

21,2

00

22,3

0014

,000

22,0

00

23,0

0014

,700

22,8

00

23,8

0015

,300

23,5

00

24,4

0015

,900

24,1

00

27,3

0018

,600

27,0

00

29,1

0020

,600

28,8

0003

0698

50L

ong

Run

nea

r Pa

rson

s,

WV

Eas

t S

R W

46.8

31.7

45.2

53.4

37.9

51.6

58.2

42.6

56.3

62.1

46.5

60.1

65.5

49.9

63.5

68.6

53.0

66.4

71.2

55.8

69.1

73.7

58.4

71.5

76.0

60.9

73.8

78.2

63.1

75.9

87.2

72.9

84.9

93.5

80.2

91.4

0306

9880

Buf

falo

Cre

ek n

ear

Row

lesb

urg,

WV

Eas

t S

R W

716

255

669

831

306

770

917

345

846

990

377

910

1,06

040

696

7

1,11

043

21,

020

1,17

045

51,

060

1,22

047

71,

110

1,26

049

81,

150

1,31

051

71,

190

1,50

059

91,

350

1,63

066

01,

470

0307

0000

Che

at R

iver

at

Row

lesb

urg,

WV

Eas

t S

R W

20,1

009,

550

19,9

00

22,9

0011

,500

22,6

00

24,9

0013

,000

24,6

00

26,6

0014

,300

26,2

00

28,1

0015

,400

27,7

00

29,4

0016

,500

28,9

00

30,5

0017

,400

30,1

00

31,6

0018

,300

31,2

00

32,6

0019

,100

32,1

00

33,5

0019

,900

33,1

00

37,5

0023

,200

37,0

00

40,3

0025

,700

39,7

00

0307

0500

Big

San

dy C

reek

nea

r R

ockv

ille,

WV

Eas

t S

R W

4,55

02,

630

4,51

0

5,08

03,

170

5,03

0

5,46

03,

580

5,42

0

5,78

03,

920

5,73

0

6,06

04,

230

6,01

0

6,31

04,

500

6,26

0

6,54

04,

750

6,49

0

6,75

04,

990

6,70

0

6,95

05,

210

6,89

0

7,13

05,

420

7,07

0

7,90

06,

320

7,85

0

8,42

06,

980

8,37

003

0710

00C

heat

Riv

er n

ear

Pisg

ah,

WV

Eas

t S

R W

24,1

0013

,000

23,7

00

28,2

0015

,700

27,7

00

31,2

0017

,700

30,6

00

33,6

0019

,400

32,9

00

35,6

0021

,000

34,9

00

37,5

0022

,400

36,7

00

39,1

0023

,600

38,3

00

40,6

0024

,800

39,8

00

42,0

0026

,000

41,2

00

43,3

0027

,000

42,4

00

48,7

0031

,600

47,7

00

52,7

0035

,000

51,6

00

0307

1500

Che

at R

iver

nea

r M

orga

ntow

n, W

VE

ast2

S25

,700

30,3

0033

,600

36,3

0038

,500

40,5

0042

,200

43,8

0045

,200

46,6

0052

,000

56,2

00

0307

2000

Dun

kard

Cre

ek a

t S

hann

opin

, PA

Nor

thS

- -

- -

- -

- -

- -

- -

- -

- -

- -

6,89

0-

--

-

0307

2590

Geo

rges

Cre

ek a

t Sm

ithfi

eld,

PA

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

662

- -

- -

0307

5450

Lit

tle

You

ghio

ghen

y R

iver

T

ribu

tary

at D

eer

Park

, M

D

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

23.7

- -

- -

0307

5500

You

ghio

ghen

y R

iver

nea

r O

akla

nd, M

DE

ast

S-

--

--

--

--

--

--

--

--

-4,

200

- -

- -

0307

5600

Toliv

er R

un T

ribu

tary

nea

r H

oyes

Run

, MD

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

28.8

- -

- -

0307

6505

You

ghio

ghen

y R

iver

T

ribu

tary

nea

r Fr

iend

svill

e, M

D

Eas

t S

- -

- -

- -

- -

- -

- -

- -

- -

- -

12.1

- -

- -

0307

6600

Bea

r Cre

ek a

t Fri

ends

ville

, M

DE

ast

S-

--

--

--

--

--

--

--

--

-1,

570

- -

- -

0310

8000

Rac

coon

Cre

ek a

t Mof

fatts

M

ill,

PAN

orth

S-

--

--

--

--

--

--

--

--

-3,

910

- -

- -

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 51

0310

9000

Lis

bon

Cre

ek a

t Lis

bon,

O

HN

orth

S-

--

--

--

--

--

--

--

--

-38

2-

--

-

0310

9500

Litt

le B

eave

r C

reek

nea

r E

ast L

iver

pool

, OH

Nor

thS

- -

- -

- -

- -

- -

- -

- -

- -

- -

9,31

0-

--

-

0311

0000

Yel

low

Cre

ek n

ear

Ham

mon

dsvi

lle,

OH

Nor

thS

- -

- -

- -

- -

- -

- -

- -

- -

- -

3,19

0-

--

-

0311

1150

Bru

sh R

un n

ear

Buf

falo

, PA

Nor

thS

- -

- -

- -

- -

- -

- -

- -

- -

- -

508

- -

- -

0311

1500

Shor

t Cre

ek n

ear

Dill

onva

le, O

HN

orth

S-

--

--

--

--

--

--

--

--

-2,

940

- -

- -

0311

2000

Whe

elin

g C

reek

at E

lm

Gro

ve, W

VN

orth

S

R W

4,79

04,

930

4,80

0

5,72

05,

650

5,72

0

6,40

06,

170

6,39

0

6,95

06,

570

6,93

0

7,41

06,

920

7,39

0

7,82

07,

220

7,80

0

8,19

07,

490

8,16

0

8,53

07,

730

8,49

0

8,83

07,

950

8,79

0

9,12

08,

160

9,07

0

10,3

009,

000

10,2

00

11,2

009,

630

11,1

00

0311

3700

Litt

le G

rave

Cre

ek n

ear

Gle

ndal

e, W

VN

orth

S

R W

176

204

182

235

251

239

281

287

282

320

317

319

356

343

352

388

367

382

417

388

409

445

408

434

471

426

458

495

443

480

601

516

576

689

573

655

0311

4000

Cap

tina

Cre

ek a

t A

rmst

rong

s M

ills,

OH

Nor

thS

- -

- -

- -

- -

- -

- -

- -

- -

- -

6,30

0-

--

-

0311

4240

Woo

d R

un n

ear

Woo

dsfi

eld,

OH

Nor

thS

- -

- -

- -

- -

- -

- -

- -

- -

- -

69.6

- -

- -

0311

4500

Mid

dle

Isla

nd C

reek

at

Litt

le, W

VN

orth

S

R W

9,09

07,

250

9,06

0

10,1

008,

240

10,1

00

10,8

008,

930

10,8

00

11,4

009,

490

11,3

00

11,8

009,

950

11,8

00

12,2

0010

,400

12,2

00

12,6

0010

,700

12,6

00

12,9

0011

,000

12,9

00

13,2

0011

,300

13,2

00

13,5

0011

,600

13,4

00

14,6

0012

,700

14,6

00

15,4

0013

,500

15,4

0003

1145

50B

uffa

lo R

un n

ear

Fri

endl

y,

WV

Nor

thS

R W

78 53 70

103 68 90

122 79 106

138 88 119

152 97 131

165

104

142

177

111

151

188

118

160

198

124

169

207

130

177

247

154

211

281

174

240

0311

4600

Litt

le B

uffa

lo R

un n

ear

Frie

ndly

, WV

Nor

thS

R W

113 67 97

142 84 120

163 98 138

181

109

153

197

120

166

210

129

178

223

137

188

234

145

198

244

153

208

254

160

216

295

189

253

328

213

283

0311

4650

Buf

falo

Run

nea

r L

ittle

, W

VN

orth

S

R W

327

179

287

422

221

362

496

253

419

559

280

468

614

303

511

664

324

550

711

344

585

753

361

619

794

378

650

831

393

680

994

459

809

1,13

051

091

5

0311

5280

Tra

il R

un n

ear

Ant

ioch

, O

HN

orth

S-

--

--

--

--

--

--

--

--

-62

9-

--

-

0311

5400

Litt

le M

uski

ngum

Riv

er a

t B

loom

fiel

d, O

HN

orth

S-

--

--

--

--

--

--

--

--

-7,

110

- -

- -

0311

5410

Gra

ham

Run

nea

r B

loom

fiel

d, O

HN

orth

S-

--

--

--

--

--

--

--

--

-19

.8-

--

-

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

52 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0311

5510

Mos

s R

un n

ear

Win

gott,

O

HN

orth

S-

--

--

--

--

--

--

--

--

-22

1-

--

-

0311

5600

Bar

ns R

un n

ear

Sum

mer

fiel

d, O

HN

orth

S-

--

--

--

--

--

--

--

--

-54

0-

--

-

0315

1400

Litt

le K

anaw

ha R

iver

nea

r W

ildc

at, W

VN

orth

S

R W

2,67

02,

390

2,65

0

3,14

02,

780

3,11

0

3,49

03,

070

3,44

0

3,77

03,

300

3,72

0

4,02

03,

490

3,96

0

4,24

03,

660

4,17

0

4,44

03,

820

4,37

0

4,62

03,

960

4,54

0

4,79

04,

080

4,71

0

4,94

04,

200

4,86

0

5,61

04,

690

5,50

0

6,10

05,

060

5,98

0

0315

1500

Litt

le K

anaw

ha R

iver

nea

r B

urns

vill

e, W

VN

orth

S

R W

3,38

03,

080

3,36

0

3,83

03,

570

3,82

0

4,14

03,

920

4,13

0

4,38

04,

210

4,37

0

4,58

04,

450

4,57

0

4,75

04,

660

4,74

0

4,89

04,

840

4,89

0

5,03

05,

010

5,02

0

5,14

05,

170

5,14

0

5,25

05,

310

5,26

0

5,68

05,

910

5,70

0

6,02

06,

350

6,04

003

1520

00L

ittle

Kan

awha

Riv

er a

t G

lenv

ille,

WV

Nor

thS

R W

6,10

06,

350

6,10

0

6,91

07,

240

6,92

0

7,48

07,

860

7,49

0

7,93

08,

360

7,94

0

8,31

08,

780

8,32

0

8,64

09,

150

8,65

0

8,92

09,

470

8,94

0

9,18

09,

760

9,20

0

9,42

010

,000

9,44

0

9,64

010

,300

9,66

0

10,5

0011

,300

10,5

00

11,2

0012

,000

11,2

00

0315

2200

Buc

k R

un n

ear

Leo

pold

, W

VN

orth

S

R W

217

134

193

244

166

220

261

191

240

276

212

256

287

231

270

298

247

282

306

262

293

314

276

303

322

289

312

328

301

320

355

354

355

375

395

381

0315

2500

Lea

ding

Cre

ek n

ear

Gle

nvill

e, W

VN

orth

S

R W

3,31

02,

910

3,26

0

3,94

03,

380

3,86

0

4,39

03,

710

4,29

0

4,75

03,

980

4,63

0

5,05

04,

210

4,92

0

5,32

04,

410

5,17

0

5,55

04,

590

5,40

0

5,76

04,

750

5,60

0

5,96

04,

900

5,79

0

6,14

05,

040

5,96

0

6,87

05,

610

6,66

0

7,44

06,

040

7,22

0

0315

3000

Stee

r C

reek

nea

r G

rant

svill

e, W

VN

orth

S

R W

3,92

03,

190

3,89

0

4,62

03,

700

4,57

0

5,11

04,

060

5,05

0

5,50

04,

350

5,43

0

5,83

04,

590

5,75

0

6,11

04,

810

6,03

0

6,36

05,

000

6,27

0

6,59

05,

180

6,50

0

6,79

05,

340

6,70

0

6,98

05,

480

6,88

0

7,74

06,

090

7,63

0

8,34

06,

550

8,23

003

1535

00 L

ittle

Kan

awha

Riv

er a

t G

rant

svill

e, W

VN

orth

S

R W

13,7

0012

,500

13,7

00

15,3

0014

,000

15,2

00

16,3

0015

,100

16,3

00

17,1

0015

,900

17,1

00

17,8

0016

,600

17,8

00

18,4

0017

,200

18,3

00

18,9

0017

,800

18,8

00

19,3

0018

,200

19,3

00

19,7

0018

,700

19,7

00

20,1

0019

,100

20,0

00

21,5

0020

,700

21,5

00

22,6

0021

,900

22,6

00

0315

4000

Wes

t For

k L

ittle

Kan

awha

R

iver

at R

ocks

dale

, WV

Nor

thS

R W

4,46

03,

850

4,44

0

5,21

04,

430

5,19

0

5,75

04,

850

5,72

0

6,18

05,

190

6,14

0

6,53

05,

470

6,50

0

6,85

05,

720

6,80

0

7,12

05,

940

7,08

0

7,37

06,

150

7,32

0

7,59

06,

330

7,55

0

7,80

06,

500

7,75

0

8,65

07,

200

8,59

0

9,31

07,

720

9,25

003

1542

50Ta

nner

Run

at S

penc

er,

WV

Nor

thS

R W

345

130

272

411

162

320

459

186

357

498

207

387

532

225

413

561

241

437

588

256

459

612

269

479

635

282

498

655

294

516

742

345

591

808

385

651

0315

4500

Ree

dy C

reek

nea

r R

eedy

, W

VN

orth

S

R W

2,33

01,

820

2,29

0

2,65

02,

130

2,61

0

2,87

02,

360

2,82

0

3,04

02,

550

2,99

0

3,17

02,

700

3,13

0

3,29

02,

840

3,25

0

3,40

02,

970

3,35

0

3,49

03,

080

3,45

0

3,57

03,

180

3,53

0

3,64

03,

280

3,61

0

3,94

03,

680

3,92

0

4,17

03,

980

4,16

003

1550

00 L

ittle

Kan

awha

Riv

er a

t Pa

lest

ine,

WV

Nor

thS

R W

18,7

0018

,600

18,7

00

21,2

0020

,700

21,2

00

22,9

0022

,200

22,9

00

24,3

0023

,300

24,2

00

25,4

0024

,200

25,3

00

26,3

0025

,000

26,3

00

27,1

0025

,800

27,1

00

27,9

0026

,400

27,8

00

28,6

0027

,000

28,5

00

29,2

0027

,500

29,1

00

31,7

0029

,700

31,6

00

33,5

0031

,200

33,5

00

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 53

0315

5200

Sou

th F

ork

Hug

hes

Riv

er

at M

acfa

rlan

, WV

Nor

thS

R W

5,63

03,

920

5,41

0

6,26

04,

520

6,02

0

6,69

04,

940

6,44

0

7,02

05,

280

6,76

0

7,30

05,

570

7,04

0

7,53

05,

830

7,27

0

7,73

06,

050

7,47

0

7,91

06,

250

7,66

0

8,07

06,

440

7,82

0

8,22

06,

610

7,97

0

8,80

07,

320

8,58

0

9,24

07,

860

9,04

003

1554

50B

ig I

slan

d R

un n

ear

Eliz

abet

h, W

VN

orth

S

R W

333

155

288

411

192

351

468

221

397

516

244

436

556

265

469

592

284

499

624

301

527

654

317

552

681

331

575

706

345

597

811

404

689

895

450

765

0315

5500

Hug

hes

Riv

er a

t Cis

co,

WV

Nor

thS

R W

8,69

07,

190

8,65

0

9,98

08,

170

9,93

0

10,9

008,

860

10,8

00

11,6

009,

410

11,5

00

12,2

009,

870

12,1

00

12,7

0010

,300

12,6

00

13,2

0010

,600

13,1

00

13,6

0011

,000

13,5

00

14,0

0011

,200

13,9

00

14,3

0011

,500

14,2

00

15,7

0012

,600

15,6

00

16,8

0013

,400

16,7

0003

1595

40Sh

ade

Riv

er n

ear

Che

ster

, O

HN

orth

S-

--

--

--

--

--

--

--

--

-3,

490

- -

- -

0315

9700

Gra

sslic

k R

un n

ear R

iple

y,

WV

Nor

thS

R W

77 44 66

91 56 79

102 65 89

111 73 97

119 80 105

126 87 111

132 93 117

138 98 123

144

103

129

149

108

134

171

129

156

187

146

173

0317

1500

New

Riv

er a

t Egg

lest

on,

VA

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

32,2

00-

--

-

0317

3000

Wal

ker

Cre

ek a

t Ban

e, V

ASo

uth

S-

--

--

--

--

--

--

--

--

-6,

620

- -

- -

0317

5500

Wol

f C

reek

nea

r N

arro

ws,

V

ASo

uth

S-

--

--

--

--

--

--

--

--

-5,

400

- -

- -

0317

6500

New

Riv

er a

t Gle

n Ly

n,

VA

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

37,9

00-

--

-

0317

7000

Ric

h C

reek

nea

r Pe

ters

tow

n, W

VSo

uth

S

R W

928

1,10

094

5

1,05

01,

310

1,07

0

1,13

01,

460

1,17

0

1,20

01,

580

1,24

0

1,25

01,

690

1,30

0

1,30

01,

780

1,35

0

1,34

01,

860

1,40

0

1,38

01,

940

1,45

0

1,41

02,

010

1,48

0

1,44

02,

080

1,52

0

1,57

02,

360

1,67

0

1,67

02,

560

1,78

0

0317

7500

Indi

an C

reek

at I

ndia

n M

ills

, WV

Sout

hS

R W

3,03

03,

180

3,04

0

3,26

03,

740

3,30

0

3,41

04,

150

3,49

0

3,52

04,

490

3,63

0

3,62

04,

780

3,74

0

3,69

05,

030

3,84

0

3,76

05,

260

3,93

0

3,82

05,

470

4,01

0

3,88

05,

660

4,08

0

3,93

05,

840

4,14

0

4,12

06,

590

4,40

0

4,26

07,

150

4,59

003

1777

00B

lues

tone

Riv

er a

t B

luef

ield

, VA

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

704

- -

- -

0317

8500

Cam

p C

reek

nea

r C

amp

Cre

ek, W

VSo

uth

S

R W

609

762

614

769

906

774

890

1,01

089

5

990

1,10

099

5

1,08

01,

170

1,08

0

1,16

01,

240

1,16

0

1,23

01,

300

1,23

0

1,29

01,

350

1,30

0

1,35

01,

400

1,36

0

1,41

01,

450

1,41

0

1,65

01,

650

1,65

0

1,84

01,

800

1,84

003

1790

00B

lues

tone

Riv

er n

ear

Pipe

stem

, WV

Sout

hS

R W

4,74

05,

750

4,76

0

5,51

06,

740

5,53

0

6,05

07,

470

6,08

0

6,49

08,

050

6,52

0

6,85

08,

560

6,90

0

7,18

09,

000

7,22

0

7,46

09,

400

7,51

0

7,72

09,

770

7,78

0

7,96

010

,100

8,02

0

8,18

010

,400

8,24

0

9,08

011

,700

9,15

0

9,76

012

,700

9,84

0

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

54 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0317

9500

Blu

esto

ne R

iver

at L

illy,

W

VSo

uth

S

R W

5,52

06,

250

5,54

0

6,27

07,

320

6,31

0

6,79

08,

100

6,84

0

7,21

08,

740

7,27

0

7,55

09,

290

7,63

0

7,85

09,

770

7,94

0

8,12

010

,200

8,21

0

8,36

010

,600

8,46

0

8,57

011

,000

8,68

0

8,77

011

,300

8,89

0

9,59

012

,700

9,73

0

10,2

0013

,700

10,4

0003

1800

00N

ew R

iver

at B

lues

tone

D

am, W

VSo

uth

S

R W

28,1

0041

,400

28,4

00

31,5

0047

,900

31,9

00

34,1

0052

,600

34,6

00

36,2

0056

,400

36,8

00

38,2

0059

,600

38,8

00

39,9

0062

,400

40,6

00

41,5

0065

,000

42,2

00

42,9

0067

,300

43,7

00

44,3

0069

,400

45,1

00

45,6

0071

,400

46,4

00

51,2

0079

,600

52,1

00

54,9

0085

,700

55,9

00

0318

0350

Wes

t For

k G

reen

brie

r R

iver

Tri

buta

ry a

t D

urbi

n, W

V

Sout

hS

R W

31.4

50.6

32.9

36.1

61.4

38.2

39.5

69.4

42.2

42.3

76.0

45.4

44.7

81.8

48.2

46.8

86.9

50.7

48.7

91.4

52.9

50.5

95.7

55.0

52.1

99.6

56.9

53.7

103.

058

.6

60.0

119.

066

.0

64.6

130.

071

.403

1805

00G

reen

brie

r R

iver

at

Dur

bin,

WV

Sout

hS

R W

2,77

02,

400

2,76

0

3,10

02,

830

3,09

0

3,35

03,

140

3,35

0

3,57

03,

400

3,56

0

3,77

03,

620

3,76

0

3,94

03,

810

3,94

0

4,10

03,

990

4,10

0

4,26

04,

150

4,26

0

4,41

04,

300

4,40

0

4,54

04,

430

4,54

0

5,15

05,

010

5,14

0

5,53

05,

440

5,53

0

0318

0530

Bru

sh R

un n

ear

Bar

tow

, W

VSo

uth

S

R W

26.8

57.9

29.0

34.9

70.2

37.8

41.2

79.3

44.7

46.7

86.8

50.6

51.6

93.3

55.9

56.1

99.1

60.7

60.3

104.

065

.1

64.1

109.

069

.2

67.8

114.

073

.0

71.3

118.

076

.7

86.5

135.

092

.5

98.7

149.

010

5.0

0318

0680

Coo

per

Run

nea

r G

reen

B

ank,

WV

Sout

hS

R W

43.9

65.0

45.5

54.3

78.7

56.4

62.2

88.8

64.6

68.8

97.2

71.5

74.6

104.

077

.5

79.8

111.

082

.9

84.5

117.

087

.8

88.8

122.

092

.4

92.9

127.

096

.6

96.7

132.

010

1.0

113.

015

1.0

117.

0

126.

016

6.0

130.

0

0318

1900

Mac

k B

utte

rbal

l Hol

low

ne

ar H

unte

rsvi

lle, W

VSo

uth

S

R W

6.5

7.3

6.6

7.4

9.0

7.6

8.0

10.3 8.2

8.5

11.4 8.8

8.9

12.3 9.3

9.3

13.1 9.7

9.6

13.8

10.1

9.9

14.5

10.4

10.2

15.2

10.7

10.4

15.7

11.0

11.4

18.3

12.1

12.1

20.2

13.0

0318

2000

Kna

pp C

reek

at M

arlin

ton,

W

VSo

uth

S

R W

3,17

02,

030

3,12

0

3,51

02,

390

3,44

0

3,76

02,

660

3,69

0

3,96

02,

880

3,90

0

4,15

03,

070

4,08

0

4,32

03,

240

4,25

0

4,47

03,

390

4,40

0

4,61

03,

520

4,54

0

4,75

03,

650

4,67

0

4,87

03,

770

4,80

0

5,41

04,

260

5,33

0

5,76

04,

630

5,68

0

0318

2500

Gre

enbr

ier

Riv

er a

t B

ucke

ye, W

VSo

uth

S

R W

10,8

007,

390

10,8

00

12,3

008,

660

12,2

00

13,4

009,

570

13,3

00

14,3

0010

,300

14,2

00

15,1

0011

,000

15,0

00

15,8

0011

,500

15,7

00

16,4

0012

,000

16,3

00

17,0

0012

,500

16,9

00

17,5

0012

,900

17,4

00

18,0

0013

,300

17,9

00

20,1

0015

,000

19,9

00

21,5

0016

,200

21,4

0003

1827

00A

ntho

ny C

reek

nea

r A

ntho

ny, W

VSo

uth

S

R W

5,98

02,

550

5,71

0

6,64

03,

010

6,33

0

7,13

03,

350

6,79

0

7,53

03,

620

7,16

0

7,88

03,

850

7,49

0

8,18

04,

060

7,78

0

8,46

04,

250

8,04

0

8,72

04,

420

8,29

0

8,96

04,

570

8,51

0

9,18

04,

720

8,72

0

10,1

005,

330

9,62

0

10,8

005,

790

10,2

00

0318

3000

Seco

nd C

reek

nea

r Sec

ond

Cre

ek, W

VSo

uth

S

R W

1,25

01,

600

1,26

0

1,50

01,

900

1,52

0

1,69

02,

110

1,70

0

1,84

02,

290

1,86

0

1,98

02,

440

2,00

0

2,09

02,

570

2,12

0

2,20

02,

690

2,22

0

2,30

02,

800

2,32

0

2,39

02,

910

2,42

0

2,48

03,

000

2,50

0

2,84

03,

390

2,87

0

3,12

03,

690

3,15

003

1835

00G

reen

brie

r R

iver

at

Ald

erso

n, W

VSo

uth

S

R W

19,8

0015

,600

19,7

00

23,0

0018

,100

23,0

00

25,3

0020

,000

25,3

00

27,2

0021

,500

27,1

00

28,7

0022

,800

28,6

00

30,0

0023

,900

29,9

00

31,2

0024

,900

31,1

00

32,2

0025

,900

32,2

00

33,2

0026

,700

33,1

00

34,1

0027

,500

34,0

00

37,7

0030

,800

37,6

00

40,5

0033

,300

40,3

00

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 55

0318

3550

Gri

ffith

Cre

ek n

ear

Ald

erso

n, W

VSo

uth

S

R W

185

137

180

207

165

202

222

186

218

234

203

230

244

218

240

252

231

249

260

243

257

266

254

264

272

264

271

277

273

277

299

312

301

316

342

319

0318

3570

Bug

gar

Lic

k at

Pen

ce

Spri

ngs,

WV

Sout

hS

R W

55 104 59

68 126 73

78 142 84

87 155 93

95 166

101

102

176

109

108

185

116

114

194

123

120

202

129

126

209

134

150

239

159

167

262

178

0318

4000

Gre

enbr

ier

Riv

er a

t H

illda

le, W

VSo

uth

S

R W

23,7

0017

,900

23,6

00

26,7

0020

,800

26,6

00

28,8

0022

,900

28,7

00

30,5

0024

,600

30,4

00

31,9

0026

,100

31,8

00

33,1

0027

,400

33,0

00

34,2

0028

,500

34,1

00

35,2

0029

,600

35,1

00

36,1

0030

,600

36,0

00

37,0

0031

,500

36,8

00

40,4

0035

,200

40,3

00

42,9

0038

,000

42,8

0003

1845

00N

ew R

iver

at H

into

n, W

VSo

uth

S

R W

44,0

0053

,000

44,1

00

50,6

0061

,200

50,8

00

55,3

0067

,100

55,4

00

59,0

0071

,900

59,2

00

62,1

0076

,000

62,3

00

64,8

0079

,600

65,1

00

67,3

0082

,800

67,5

00

69,4

0085

,700

69,7

00

71,4

0088

,400

71,7

00

73,3

0090

,800

73,6

00

80,8

0010

1,00

081

,200

86,5

0010

9,00

086

,900

0318

5000

Pin

ey C

reek

at R

alei

gh,

WV

Sout

hS

R W

594

1,14

060

8

706

1,35

072

4

789

1,51

081

0

857

1,63

088

2

918

1,74

094

5

972

1,84

01,

000

1,02

01,

920

1,05

0

1,07

02,

000

1,10

0

1,11

02,

080

1,14

0

1,15

02,

150

1,18

0

1,31

02,

430

1,36

0

1,44

02,

650

1,49

003

1850

20L

ittle

Bea

ver

Cre

ek

Tri

buta

ry n

ear

Shad

y Sp

ring

s, W

V

Sout

hS

R W

10.7

31.1

11.9

14.3

37.9

15.9

17.1

42.9

19.0

19.5

47.0

21.7

21.6

50.6

24.1

23.5

53.8

26.2

25.3

56.7

28.2

27.0

59.4

30.0

28.5

61.9

31.7

30.0

64.2

33.3

36.3

73.9

40.1

41.5

81.4

45.7

0318

5500

New

Riv

er a

t Cap

erto

n,

WV

Sout

h2S

50,8

0059

,400

65,6

0070

,600

74,9

0078

,600

81,9

0084

,900

87,6

0090

,200

101,

000

109,

000

0318

6000

New

Riv

er a

t Fay

ette

, WV

Sout

hS

R W

49,2

0057

,000

49,4

00

59,3

0065

,800

59,4

00

66,5

0072

,100

66,6

00

72,3

0077

,300

72,5

00

77,3

0081

,600

77,4

00

81,6

0085

,500

81,7

00

85,5

0088

,900

85,6

00

89,0

0092

,000

89,1

00

92,2

0094

,900

92,3

00

95,2

0097

,500

95,3

00

107,

000

109,

000

107,

000

117,

000

117,

000

117,

000

0318

6500

Wil

liam

s R

iver

at D

yer,

WV

Sout

hS

R W

4,60

02,

320

4,56

0

5,25

02,

740

5,19

0

5,72

03,

050

5,65

0

6,11

03,

300

6,03

0

6,44

03,

510

6,36

0

6,74

03,

700

6,66

0

7,01

03,

870

6,92

0

7,26

04,

030

7,16

0

7,49

04,

170

7,39

0

7,70

04,

300

7,60

0

8,60

04,

860

8,49

0

9,23

05,

280

9,11

003

1870

00G

aule

y R

iver

at C

amde

n on

Gau

ley,

WV

Sout

hS

R W

6,46

03,

800

6,41

0

7,54

04,

470

7,47

0

8,32

04,

960

8,24

0

8,96

05,

350

8,87

0

9,51

05,

700

9,41

0

9,99

06,

000

9,89

0

10,4

006,

270

10,3

00

10,8

006,

510

10,7

00

11,2

006,

740

11,1

00

11,5

006,

950

11,4

00

13,0

007,

840

12,8

00

14,0

008,

500

13,9

00

0318

7300

Nor

th F

ork

Cra

nber

ry

Riv

er n

ear

Hill

sbor

o,

WV

Sout

hS

R W

403

293

395

473

352

463

526

394

514

570

430

557

608

460

595

643

487

628

675

511

659

704

533

688

732

554

714

758

573

739

869

653

846

948

714

923

0318

7500

Cra

nber

ry R

iver

nea

r R

ichw

ood,

WV

Sout

hS

R W

2,75

01,

600

2,72

0

3,15

01,

890

3,11

0

3,44

02,

110

3,39

0

3,68

02,

280

3,63

0

3,89

02,

430

3,83

0

4,07

02,

560

4,01

0

4,23

02,

680

4,17

0

4,38

02,

790

4,32

0

4,52

02,

890

4,45

0

4,65

02,

990

4,58

0

5,20

03,

380

5,12

0

5,59

03,

680

5,50

0

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

56 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0318

9000

Che

rry

Riv

er a

t Fen

wic

k,

WV

Sout

hS

R W

5,00

02,

640

4,92

0

5,64

03,

110

5,55

0

6,13

03,

460

6,02

0

6,53

03,

740

6,42

0

6,89

03,

980

6,77

0

7,22

04,

190

7,09

0

7,51

04,

390

7,37

0

7,79

04,

560

7,64

0

8,04

04,

720

7,90

0

8,28

04,

870

8,13

0

9,33

05,

500

9,15

0

10,0

005,

970

9,84

003

1891

00G

aule

y R

iver

nea

r C

raig

svill

e, W

VSo

uth

S

R W

13,9

007,

270

13,7

00

16,4

008,

520

16,1

00

18,2

009,

420

17,9

00

19,7

0010

,200

19,3

00

20,9

0010

,800

20,5

00

22,0

0011

,300

21,5

00

23,0

0011

,800

22,4

00

23,9

0012

,300

23,3

00

24,7

0012

,700

24,1

00

25,4

0013

,100

24,8

00

28,5

0014

,700

27,8

00

30,9

0015

,900

30,1

00

0318

9500

Gau

ley

Riv

er n

ear

Sum

mer

svill

e, W

VSo

uth

S

R W

16,7

008,

900

16,5

00

18,6

0010

,400

18,3

00

20,0

0011

,500

19,6

00

21,1

0012

,400

20,7

00

22,1

0013

,100

21,7

00

22,9

0013

,800

22,5

00

23,7

0014

,400

23,3

00

24,4

0015

,000

24,0

00

25,1

0015

,500

24,6

00

25,7

0015

,900

25,2

00

28,3

0017

,900

27,8

00

30,1

0019

,400

29,6

0003

1896

50C

olli

son

Cre

ek n

ear

Nal

len,

WV

Sout

hS

R W

84 107 86

102

130

105

116

146

119

127

159

131

137

171

140

145

181

149

153

191

157

160

199

164

166

207

171

172

215

177

197

246

203

216

270

223

0319

0000

Mea

dow

Riv

er a

t Nal

len,

W

VSo

uth

S

R W

3,82

04,

450

3,83

0

4,31

05,

230

4,33

0

4,66

05,

790

4,68

0

4,93

06,

250

4,96

0

5,17

06,

650

5,20

0

5,37

07,

000

5,40

0

5,54

07,

310

5,59

0

5,70

07,

600

5,75

0

5,85

07,

860

5,90

0

5,98

08,

100

6,03

0

6,53

09,

130

6,59

0

6,93

09,

900

7,01

003

1904

00M

eado

w R

iver

nea

r Mou

nt

Loo

kout

, WV

Sout

hS

R W

5,41

05,

390

5,41

0

6,22

06,

330

6,23

0

6,81

07,

010

6,81

0

7,27

07,

560

7,28

0

7,66

08,

040

7,68

0

8,01

08,

460

8,03

0

8,31

08,

830

8,34

0

8,59

09,

180

8,62

0

8,84

09,

490

8,87

0

9,08

09,

790

9,11

0

10,0

0011

,000

10,1

00

10,8

0011

,900

10,8

00

0319

0500

Mea

dow

Cre

ek n

ear

Sum

mer

svill

e, W

VSo

uth

S

R W

198

149

193

227

179

221

247

201

241

263

220

257

277

236

271

288

250

283

298

263

293

307

274

302

315

285

311

323

295

319

353

338

351

377

370

376

0319

1400

Lau

rel C

reek

nea

r Su

mm

ersv

ille,

WV

Sout

hS

R W

81 152 84

106

182

111

127

205

132

144

224

150

160

240

166

175

255

181

188

268

194

200

279

207

212

290

219

224

301

230

273

344

279

313

377

319

0319

1500

Pete

rs C

reek

nea

r L

ockw

ood,

WV

Sout

hS

R W

1,23

091

51,

210

1,47

01,

090

1,46

0

1,66

01,

210

1,64

0

1,81

01,

320

1,79

0

1,95

01,

410

1,92

0

2,07

01,

480

2,04

0

2,18

01,

560

2,14

0

2,28

01,

620

2,24

0

2,38

01,

680

2,34

0

2,47

01,

740

2,42

0

2,85

01,

970

2,79

0

3,13

02,

140

3,07

003

1920

00G

aule

y R

iver

abo

ve B

elva

, W

VSo

uth

S

R W

26,4

0015

,100

26,2

00

29,7

0017

,600

29,4

00

32,0

0019

,400

31,8

00

33,9

0020

,900

33,6

00

35,6

0022

,200

35,3

00

37,0

0023

,300

36,7

00

38,3

0024

,300

38,0

00

39,5

0025

,200

39,2

00

40,6

0026

,000

40,3

00

41,7

0026

,800

41,3

00

45,9

0030

,000

45,5

00

48,9

0032

,400

48,5

00

0319

2500

Gau

ley

Riv

er a

t Bel

va,

WV

Sout

hS

R W

21,5

0015

,900

21,3

00

24,9

0018

,500

24,5

00

27,2

0020

,400

26,9

00

29,1

0022

,000

28,7

00

30,7

0023

,300

30,3

00

32,1

0024

,500

31,7

00

33,4

0025

,500

32,9

00

34,5

0026

,400

34,0

00

35,5

0027

,300

35,0

00

36,5

0028

,100

35,9

00

40,3

0031

,500

39,8

00

43,3

0034

,000

42,7

0003

1930

00K

anaw

ha R

iver

at

Kan

awha

Fal

ls, W

VSo

uth

S

R W

70,9

0067

,000

70,8

00

82,5

0077

,300

82,4

00

90,7

0084

,600

90,7

00

97,3

0090

,600

97,3

00

103,

000

95,6

0010

3,00

0

108,

000

100,

000

108,

000

112,

000

104,

000

112,

000

116,

000

108,

000

116,

000

120,

000

111,

000

119,

000

123,

000

114,

000

123,

000

136,

000

127,

000

136,

000

147,

000

137,

000

146,

000

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 57

0319

3725

Litt

le F

ork

at M

ossy

, WV

Sout

hS

R W

10.1

22.4

11.0

11.8

27.4

12.9

13.0

31.1

14.4

13.9

34.1

15.6

14.8

36.8

16.6

15.6

39.1

17.5

16.2

41.2

18.4

16.9

43.2

19.1

17.4

45.0

19.9

18.0

46.7

20.5

20.3

53.9

23.3

21.9

59.4

25.3

0319

4700

Elk

Riv

er b

elow

Web

ster

Sp

ring

s, W

VSo

uth

S

R W

7,08

04,

180

7,02

0

7,92

04,

920

7,86

0

8,54

05,

450

8,46

0

9,04

05,

890

8,97

0

9,49

06,

260

9,41

0

9,88

06,

590

9,80

0

10,2

006,

890

10,1

00

10,6

007,

160

10,5

00

10,9

007,

410

10,8

00

11,1

007,

640

11,0

00

12,3

008,

600

12,2

00

13,2

009,

330

13,0

0003

1950

00E

lk R

iver

at C

entr

alia

, WV

Sout

h2S

8,23

08,

940

9,43

09,

800

10,1

0010

,400

10,6

0010

,800

11,0

0011

,200

11,9

0012

,300

0319

5100

Rig

ht F

ork

Hol

ly R

iver

at

Gua

rdia

n, W

VSo

uth

S

R W

1,45

01,

120

1,41

0

1,65

01,

330

1,61

0

1,79

01,

490

1,75

0

1,91

01,

610

1,87

0

2,01

01,

720

1,97

0

2,10

01,

820

2,06

0

2,18

01,

900

2,14

0

2,26

01,

980

2,22

0

2,33

02,

050

2,29

0

2,39

02,

120

2,35

0

2,67

02,

400

2,63

0

2,86

02,

620

2,82

003

1952

50L

eft F

ork

Hol

ly R

iver

nea

r R

eple

te, W

VSo

uth

S

R W

1,41

01,

030

1,39

0

1,64

01,

220

1,61

0

1,81

01,

360

1,77

0

1,94

01,

480

1,91

0

2,06

01,

580

2,02

0

2,17

01,

670

2,13

0

2,26

01,

740

2,22

0

2,35

01,

820

2,31

0

2,44

01,

880

2,39

0

2,51

01,

940

2,46

0

2,84

02,

210

2,78

0

3,07

02,

400

3,01

0

0319

5500

Elk

Riv

er a

t Sut

ton,

WV

Sout

hS

R W

12,4

007,

410

12,3

00

14,0

008,

680

13,9

00

15,1

009,

600

15,0

00

16,0

0010

,300

15,8

00

16,7

0011

,000

16,6

00

17,3

0011

,600

17,2

00

17,9

0012

,100

17,7

00

18,4

0012

,500

18,2

00

18,8

0012

,900

18,7

00

19,2

0013

,300

19,1

00

20,9

0015

,000

20,7

00

22,2

0016

,200

22,0

0003

1956

00G

rann

y C

reek

at S

utto

n,

WV

Sout

hS

R W

578

224

541

646

269

603

695

302

647

733

330

683

766

353

713

794

374

740

819

393

764

842

410

785

863

426

805

882

441

823

962

503

900

1,02

055

095

5

0319

7000

Elk

Riv

er a

t Que

en S

hoal

s,

WV

Sout

hS

R W

17,9

0013

,500

17,9

00

19,9

0015

,800

19,8

00

21,3

0017

,400

21,2

00

22,5

0018

,700

22,4

00

23,4

0019

,800

23,4

00

24,3

0020

,800

24,2

00

25,1

0021

,700

25,0

00

25,8

0022

,500

25,7

00

26,4

0023

,300

26,3

00

27,0

0024

,000

26,9

00

29,5

0026

,900

29,4

00

31,2

0029

,000

31,2

0003

1971

50 A

shle

ycam

p R

un n

ear

Lef

t Han

d, W

VSo

uth

S

R W

140 82 133

155 99 147

165

112

158

172

122

165

179

131

172

184

139

178

189

146

183

194

153

188

198

159

192

201

165

196

216

189

212

226

208

224

0319

7900

Elk

Tw

omil

e C

reek

T

ribu

tary

nea

r C

harl

esto

n, W

V

Sout

hS

R W

32.6

26.8

32.0

39.6

32.7

38.8

44.8

37.1

43.8

49.2

40.7

48.0

53.0

43.8

51.7

56.4

46.6

55.1

59.6

49.2

58.1

62.4

51.5

60.8

65.1

53.6

63.4

67.6

55.6

65.8

78.4

64.1

76.2

86.5

70.6

84.0

0319

8450

Dra

wdy

Cre

ek n

ear

Pey

tona

, WV

Sout

hS

R W

162

245

167

196

294

202

223

330

230

245

359

253

266

385

274

284

407

294

301

428

311

317

446

327

332

464

343

346

480

357

409

547

421

455

599

467

0319

8500

Big

Coa

l Riv

er a

t A

shfo

rd, W

VSo

uth

S

R W

5,35

05,

700

5,36

0

6,42

06,

690

6,42

0

7,20

07,

410

7,20

0

7,85

07,

990

7,85

0

8,40

08,

490

8,41

0

8,90

08,

930

8,90

0

9,35

09,

330

9,35

0

9,76

09,

690

9,75

0

10,1

0010

,000

10,1

00

10,5

0010

,300

10,5

00

12,0

0011

,600

12,0

00

13,1

0012

,600

13,1

0003

1987

80H

unte

rs B

ranc

h ne

ar

Mad

ison

, WV

Sout

hS

R W

55 82 57

68 99 71

78 112 81

86 122 90

93 131 97

99 139

104

105

146

110

110

153

115

115

159

120

120

165

125

139

189

145

154

208

161

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

58 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0319

8800

Low

Gap

Cre

ek n

ear

Mad

ison

, WV

Sout

hS

R W

19.0

57.9

20.8

27.7

70.2

30.3

35.1

79.3

38.1

41.8

86.8

45.2

48.0

93.3

51.6

53.7

99.1

57.5

59.2

104.

063

.1

64.4

109.

068

.4

69.3

114.

073

.4

74.0

118.

078

.2

95.4

135.

099

.5

114.

014

9.0

118.

003

1990

00 L

ittle

Coa

l Riv

er a

t D

anvi

lle, W

VSo

uth

S

R W

4,00

04,

220

4,00

0

5,03

04,

960

5,03

0

5,81

05,

500

5,80

0

6,46

05,

940

6,45

0

7,03

06,

320

7,01

0

7,54

06,

650

7,51

0

8,00

06,

950

7,97

0

8,43

07,

220

8,40

0

8,83

07,

470

8,79

0

9,20

07,

700

9,16

0

10,8

008,

680

10,7

00

12,1

009,

410

12,0

00

0319

9400

Litt

le C

oal R

iver

at J

ulia

n,

WV

Sout

hS

R W

4,98

04,

830

4,97

0

5,93

05,

670

5,91

0

6,65

06,

280

6,61

0

7,25

06,

780

7,19

0

7,78

07,

210

7,71

0

8,25

07,

590

8,16

0

8,68

07,

920

8,58

0

9,07

08,

230

8,96

0

9,45

08,

520

9,32

0

9,79

08,

780

9,65

0

11,3

009,

890

11,1

00

12,4

0010

,700

12,1

0003

2005

00C

oal R

iver

at T

orna

do,

WV

Sout

hS

R W

11,8

0010

,800

11,8

00

13,8

0012

,600

13,8

00

15,3

0013

,900

15,2

00

16,4

0014

,900

16,3

00

17,3

0015

,900

17,3

00

18,1

0016

,700

18,1

00

18,8

0017

,400

18,8

00

19,5

0018

,000

19,4

00

20,0

0018

,600

20,0

00

20,6

0019

,200

20,5

00

22,7

0021

,500

22,7

00

24,4

0023

,300

24,4

00

0320

0600

Litt

le S

cary

Cre

ek n

ear

Nitr

o, W

VSo

uth

S

R W

42.3

43.1

42.4

50.7

52.3

50.9

56.9

59.2

57.2

62.1

64.9

62.4

66.5

69.8

66.9

70.4

74.1

70.9

74.0

78.1

74.5

77.3

81.7

77.9

80.3

85.1

80.9

83.1

88.2

83.8

95.0

101.

095

.9

104.

011

2.0

105.

003

2010

00Po

cata

lico

Riv

er a

t Si

sson

ville

, WV

Sout

hS

R W

3,77

03,

820

3,77

0

4,43

04,

500

4,43

0

4,90

04,

990

4,91

0

5,28

05,

390

5,28

0

5,60

05,

730

5,60

0

5,87

06,

040

5,88

0

6,12

06,

310

6,12

0

6,34

06,

560

6,35

0

6,54

06,

790

6,55

0

6,73

07,

000

6,73

0

7,48

07,

890

7,49

0

8,07

08,

550

8,08

0

0320

1410

Popl

ar F

ork

at T

eays

, WV

Sout

hS

R W

629

262

596

721

314

680

785

353

739

837

384

787

880

412

827

917

436

862

950

458

893

980

477

921

1,01

049

694

6

1,03

051

397

0

1,13

058

51,

070

1,21

064

01,

140

0320

1420

Lon

g B

ranc

h ne

ar T

eays

, W

VSo

uth

S

R W

156 85 148

181

103

171

197

116

187

211

127

199

221

136

209

231

145

218

239

152

226

246

159

233

253

165

240

259

171

246

283

197

270

302

216

289

0320

1440

Sixt

eenm

ile

Cre

ek n

ear

Plin

y, W

VSo

uth

S

R W

158 48 142

186 59 166

207 66 183

224 73 198

240 78 210

254 83 222

266 88 232

277 92 242

288 95 251

298 99 259

341

114

296

372

125

322

0320

1480

Thr

eem

ile C

reek

Tri

buta

ry

near

Poi

nt P

leas

ant,

WV

Sout

hS

R W

47 35 45

63 43 61

76 49 72

87 53 82

97 57 91

105 61 99

113 64 106

121 67 112

127 70 118

134 72 124

161 83 148

185 92 168

0320

2000

Rac

coon

Cre

ek a

t A

dam

svill

e, O

HSo

uth

S-

--

--

--

--

--

--

--

--

-6,

030

- -

- -

0320

2400

Guy

ando

tte

Riv

er n

ear

Bai

leys

vill

e, W

VSo

uth

S

R W

3,08

04,

680

3,12

0

4,00

05,

500

4,05

0

4,72

06,

090

4,77

0

5,33

06,

580

5,38

0

5,87

06,

990

5,92

0

6,37

07,

360

6,41

0

6,82

07,

690

6,85

0

7,23

07,

990

7,27

0

7,62

08,

270

7,65

0

7,99

08,

520

8,02

0

9,58

09,

600

9,58

0

10,9

0010

,400

10,8

0003

2024

80B

rier

Cre

ek a

t Fan

rock

, W

VSo

uth

S

R W

205

233

208

252

280

254

287

314

289

316

342

319

341

367

344

364

388

367

385

408

388

404

425

407

422

442

425

439

457

441

511

522

512

566

571

567

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 59

0320

2750

Cle

ar F

ork

at C

lear

For

k,

WV

Sout

hS

R W

2,60

02,

290

2,59

0

2,98

02,

710

2,97

0

3,26

03,

010

3,24

0

3,48

03,

260

3,46

0

3,66

03,

470

3,65

0

3,83

03,

660

3,82

0

3,98

03,

820

3,97

0

4,11

03,

980

4,10

0

4,23

04,

120

4,23

0

4,35

04,

250

4,34

0

4,82

04,

800

4,82

0

5,16

05,

220

5,17

003

2030

00G

uyan

dott

e R

iver

at M

an,

WV

Sout

hS

R W

9,97

09,

710

9,96

0

12,2

0011

,300

12,1

00

13,7

0012

,500

13,7

00

15,0

0013

,500

15,0

00

16,1

0014

,300

16,1

00

17,1

0015

,100

17,0

00

17,9

0015

,700

17,9

00

18,7

0016

,300

18,6

00

19,4

0016

,900

19,3

00

20,0

0017

,400

20,0

00

22,7

0019

,500

22,6

00

24,9

0021

,100

24,8

00

0320

3600

Guy

ando

tte

Riv

er a

t L

ogan

, WV

Sout

hS

R W

10,9

0010

,500

10,9

00

13,7

0012

,200

13,7

00

15,8

0013

,500

15,7

00

17,5

0014

,500

17,4

00

19,0

0015

,400

18,9

00

20,3

0016

,200

20,1

00

21,5

0016

,900

21,3

00

22,6

0017

,600

22,3

00

23,5

0018

,100

23,3

00

24,5

0018

,700

24,2

00

28,3

0021

,000

28,0

00

31,4

0022

,700

31,0

0003

2040

00G

uyan

dott

e R

iver

at

Bra

nchl

and,

WV

Sout

hS

R W

11,7

0014

,300

11,8

00

14,3

0016

,600

14,3

00

16,1

0018

,300

16,2

00

17,6

0019

,700

17,6

00

18,8

0020

,900

18,8

00

19,8

0022

,000

19,9

00

20,8

0022

,900

20,8

00

21,6

0023

,800

21,6

00

22,3

0024

,500

22,4

00

23,0

0025

,300

23,1

00

25,8

0028

,300

25,9

00

28,2

0030

,600

28,2

00

0320

4500

Mud

Riv

er n

ear

Mil

ton,

W

VSo

uth

S

R W

3,29

04,

060

3,31

0

3,89

04,

770

3,91

0

4,33

05,

290

4,35

0

4,69

05,

710

4,71

0

5,01

06,

070

5,04

0

5,29

06,

390

5,32

0

5,55

06,

680

5,58

0

5,78

06,

940

5,82

0

6,01

07,

190

6,04

0

6,21

07,

410

6,24

0

7,09

08,

350

7,13

0

7,73

09,

050

7,77

003

2059

95Sa

ndus

ky C

reek

nea

r B

urlin

gton

, OH

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

103

- -

- -

0320

6600

Eas

t For

k Tw

elve

pole

C

reek

nea

r D

unlo

w,

WV

Sout

hS

R W

1,10

088

41,

090

1,25

01,

050

1,24

0

1,35

01,

170

1,34

0

1,44

01,

270

1,43

0

1,51

01,

360

1,51

0

1,58

01,

430

1,57

0

1,64

01,

500

1,63

0

1,69

01,

570

1,68

0

1,74

01,

620

1,73

0

1,78

01,

680

1,78

0

1,97

01,

900

1,97

0

2,11

02,

070

2,10

003

2068

00E

ast F

ork

Twel

vepo

le

Cre

ek n

ear

Eas

t Lyn

n,

WV

Sout

hS

R W

1,99

02,

480

2,01

0

2,29

02,

930

2,33

0

2,50

03,

250

2,55

0

2,68

03,

520

2,73

0

2,83

03,

750

2,89

0

2,96

03,

950

3,03

0

3,08

04,

130

3,15

0

3,18

04,

300

3,26

0

3,28

04,

450

3,37

0

3,38

04,

590

3,46

0

3,76

05,

180

3,87

0

4,04

05,

630

4,16

0

0320

7000

Twel

vepo

le C

reek

at

Way

ne, W

VSo

uth2

S3,

210

3,89

04,

390

4,80

05,

160

5,47

05,

750

6,01

06,

240

6,46

07,

380

8,10

0

0320

7020

Twel

vepo

le C

reek

bel

ow

Way

ne, W

VSo

uth

S

R W

3,24

04,

610

3,26

0

3,92

05,

410

3,95

0

4,42

06,

000

4,45

0

4,83

06,

480

4,86

0

5,17

06,

890

5,21

0

5,48

07,

250

5,52

0

5,76

07,

570

5,80

0

6,01

07,

870

6,06

0

6,25

08,

140

6,29

0

6,46

08,

390

6,51

0

7,37

09,

450

7,42

0

8,07

010

,200

8,13

003

2079

62D

icks

For

k at

Phy

llis

, KY

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

52.4

- -

- -

0320

8000

Lev

isa

Fork

bel

ow

Fish

trap

Dam

, KY

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

12,1

00-

--

-

0320

9575

Bill

D. B

ranc

h ne

ar K

ite,

KY

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

287

- -

- -

0321

0000

John

s C

reek

nea

r M

eta,

K

YSo

uth

S-

--

--

--

--

--

--

--

--

-2,

710

- -

- -

0321

1500

John

s C

reek

nea

r Van

Lea

r, K

YSo

uth

S-

--

--

--

--

--

--

--

--

-3,

920

- -

- -

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

60 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

0321

2000

Pain

t Cre

ek a

t St

affo

rdsv

ille,

KY

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

5,28

0-

--

-

0321

2750

Tug

For

k at

Wel

ch, W

VSo

uth

S

R W

1,42

02,

970

1,50

0

1,71

03,

500

1,82

0

1,92

03,

890

2,06

0

2,10

04,

210

2,25

0

2,25

04,

480

2,42

0

2,39

04,

710

2,57

0

2,51

04,

930

2,70

0

2,62

05,

130

2,83

0

2,73

05,

310

2,94

0

2,82

05,

470

3,05

0

3,23

06,

180

3,49

0

3,54

06,

700

3,83

0

0321

2980

Dry

For

k at

Bea

rtow

n, W

VSo

uth

S

R W

2,97

03,

450

3,00

0

3,44

04,

060

3,50

0

3,78

04,

500

3,84

0

4,04

04,

860

4,12

0

4,26

05,

170

4,35

0

4,45

05,

450

4,55

0

4,62

05,

690

4,73

0

4,77

05,

920

4,89

0

4,91

06,

130

5,03

0

5,04

06,

320

5,17

0

5,55

07,

130

5,71

0

5,94

07,

730

6,13

003

2130

00T

ug F

ork

at L

itwar

, WV

Sout

hS

R W

5,35

06,

990

5,37

0

6,74

08,

190

6,77

0

7,79

09,

060

7,81

0

8,65

09,

770

8,68

0

9,40

010

,400

9,42

0

10,1

0010

,900

10,1

00

10,7

0011

,400

10,7

00

11,2

0011

,800

11,2

00

11,7

0012

,200

11,7

00

12,2

0012

,600

12,2

00

14,2

0014

,200

14,2

00

15,8

0015

,300

15,8

00

0321

3500

Pant

her

Cre

ek n

ear

Pant

her,

WV

Sout

hS

R W

572

742

576

766

884

769

918

987

920

1,05

01,

070

1,05

0

1,16

01,

140

1,16

0

1,27

01,

210

1,26

0

1,36

01,

270

1,36

0

1,45

01,

320

1,45

0

1,53

01,

370

1,53

0

1,61

01,

420

1,60

0

1,95

01,

610

1,93

0

2,23

01,

750

2,21

003

2137

00T

ug F

ork

at W

illia

mso

n,

WV

Sout

hS

R W

8,17

011

,500

8,25

0

9,98

013

,400

10,1

00

11,3

0014

,800

11,5

00

12,5

0016

,000

12,6

00

13,5

0016

,900

13,6

00

14,4

0017

,800

14,5

00

15,2

0018

,500

15,4

00

16,0

0019

,200

16,1

00

16,7

0019

,900

16,9

00

17,4

0020

,500

17,5

00

20,3

0023

,000

20,4

00

22,5

0024

,800

22,6

00

0321

4000

Tug

For

k ne

ar K

erm

it, W

VSo

uth2

S10

,100

12,8

0014

,900

16,6

0018

,100

19,4

0020

,700

21,8

0022

,900

23,9

0028

,100

31,5

0003

2145

00T

ug F

ork

at K

erm

it, W

VSo

uth

S

R W

11,4

0014

,800

11,4

00

14,0

0017

,200

14,0

00

15,9

0019

,000

15,9

00

17,5

0020

,400

17,6

00

18,9

0021

,700

19,0

00

20,2

0022

,800

20,2

00

21,3

0023

,700

21,4

00

22,4

0024

,600

22,4

00

23,4

0025

,400

23,4

00

24,3

0026

,200

24,3

00

28,2

0029

,300

28,2

00

31,2

0031

,700

31,2

0003

2149

00T

ug F

ork

at G

lenh

ayes

, W

VSo

uth

S

R W

9,08

016

,900

9,50

0

11,0

0019

,600

11,6

00

12,5

0021

,600

13,1

00

13,6

0023

,300

14,3

00

14,7

0024

,700

15,4

00

15,6

0025

,900

16,4

00

16,4

0027

,000

17,3

00

17,2

0028

,000

18,1

00

17,9

0028

,900

18,8

00

18,6

0029

,800

19,5

00

21,4

0033

,300

22,4

00

23,6

0036

,000

24,7

00

0321

5500

Bla

ine

Cre

ek a

t Yat

esvi

lle,

KY

Sout

hS

-

--

--

--

--

--

--

--

--

-6,

000

- -

- -

0321

6500

Litt

le S

andy

Riv

er a

t G

rays

on, K

YSo

uth

S-

--

--

--

--

--

--

--

--

-9,

910

- -

- -

0321

6540

Eas

t For

k L

ittle

San

dy

Riv

er n

ear

Falls

burg

, K

Y

Sout

hS

- -

- -

- -

- -

- -

- -

- -

- -

- -

815

- -

- -

0321

6563

Mil

e B

ranc

h ne

ar R

ush,

K

YSo

uth

S-

--

--

--

--

--

--

--

--

-19

9-

--

-

1 The

sta

tion

is lo

cate

d in

Wes

t Vir

gini

a bu

t is

oper

ated

by

the

U.S

. Geo

logi

cal S

urve

y in

Mar

ylan

d, a

nd is

con

side

red

as o

ne o

f th

e si

te”o

pera

ted

by a

sur

roun

ding

sta

te”

for

this

stu

dy.

2 The

sta

tion

is lo

cate

d in

the

indi

cate

d re

gion

, but

was

not

use

d in

the

regi

onal

fre

quen

cy a

naly

sis.

Tab

le 4

. Mag

nitu

de a

nd fr

eque

ncy

of p

eak

disc

harg

es fo

r ga

ging

sta

tions

in W

est V

irgin

ia a

nd s

urro

undi

ng S

tate

s—C

ontin

ued

Peak

dis

char

ges

for

the

indi

cate

d re

curr

ence

inte

rval

are

pre

sent

ed in

the

follo

win

g or

der:

fir

st li

ne (

S), f

rom

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Wat

er

Res

ourc

es C

ounc

il; s

econ

d lin

e (R

), f

rom

the

regi

onal

ized

reg

ress

ion

equa

tion;

and

, thi

rd li

ne (

W),

fro

m w

eigh

ting

(1)

the

syst

emat

ic a

nd h

isto

rica

l rec

ord

on th

e ba

sis

of th

e gu

idel

ines

est

abli

shed

by

the

Sta

tio

nN

o.

Sta

tio

n n

ame

and

Sta

te R

egio

nE

sti-

mat

ety

pe

Pea

k d

isch

arg

e fo

r th

e in

dic

ated

rec

urr

ence

inte

rval

, in

cu

bic

fee

t p

er s

eco

nd

1.1-

year

1.2-

year

1.3-

year

1.4-

year

1.5-

year

1.6-

year

1.7-

year

1.8-

year

1.9-

year

2-ye

ar2.

5-ye

ar3-

year

Table 4 61

Appendix 1. Fortran program forCalculating Frequency Factors

C 10/29/2001 MAIN written by John Atkins, Charleston, WVC remainder is from LIB3.2 rev of 6-29-98C The input is a skewC The output is a list of frequency factors

C Calls:C GAUSAB GAUSCF GAUSDY GAUSEX HARTIV HARTK HARTK1C HARTP HARTP1 HARTRG OUTKGB STUTP STUTX STVRSNC WILFRS WILFRT WILFRV

DIMENSION PROB1(31), PROB2(31), PD(31) REAL NEXPR DATA PROB2 / 0.00010, # 0.00050, 0.00100, 0.00200, 0.00500, 0.01000, 0.02000, # 0.02500, 0.04000, 0.05000, 0.10000, 0.20000, 0.30000, # 0.40000, 0.429624, 0.50000, 0.570376, 0.60000, 0.70000, # 0.80000, 0.90000, 0.95000, 0.96000, 0.97500, 0.98000, # 0.99000, 0.99500, 0.99800, 0.99900, 0.99950, 0.99990 / open (7,file='freqfactg') WRITE(6,*) ' ENTER SKEW:' READ(5,*) SKEW CALL HARTIV(SKEW,PD)c WRITE(6,*) ' K-value REF: 17-B Appendix 3: ', HARTK(NEXPR,PD) do 20 i=1,31 WRITE(7,18) (1 - PROB2(i)),PD(i) 18 format(1h ,f20.7,f15.5) 20 continue EXPR = 1/1.1 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.2 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.3 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.4 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.5 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.6 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.7 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.8 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/1.9 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

EXPR = 1/3.0 NEXPR = 1. - EXPR WRITE(7,18) EXPR,HARTK(NEXPR,PD)

END

Appendix 1 65

Appendix 2. Accuracy ofEstimating Equations

The uncertainty or error in a prediction at an ungaged site may be estimated by partitioning the mean square error into the part due to having an imperfect model, γ2, and the part due to sampling error, MSEs (Tasker and Ste-dinger, 1989). The values for the standard error of the model, γ, are calculated in log (base 10) units. The standard error of the model can be transformed from log (base 10) units to percent with the equation

SEmodel(in percent) = .

The values for SEmodel (in percent) for each regional equation are shown in table 1. The sampling mean square error, MSEs, is the mean square error for a site due to estimating the true model parameters from observed flows at gaging stations in a region. The MSEs value at a specific site can be estimated as described below. Denote the column vector of n logarithms of observed peak-discharge characteristics at n sites in a region by Y. For exam-ple,

Y = ,

where, Q50,i represents the observed 50-year peak at the ith gaging station in the region. Further, let X represent a (n by p) matrix of p-1 basin characteristics augmented by a column of ones at n gaging stations in a region, and let B represent a column vector of p regression coefficients. For example, in the North Region where drainage area, A, was the significant explanatory variable,

X = and B = .

The linear model can be written in matrix notation as

Y = XB.

100 e 5.3019γ2( ) 1–0.5

Q50 1,log

Q50 2,log

……Q50 n,log

1 A1( )log

1 A2( )log

… …… …1 An( )log

ab

Appendix 2 69

The mean square sampling error, MSEs, for an ungaged site with basin characteristics given by the row vector x0 =[1 log(A0)], for example, is calculated as

MSEs = x0{XTΛ-1X}-1x0T,

where Λ is the (n by n) covariance matrix associated with Y. The diagonal elements of Λ are model error variance, γ2, plus the time sampling error for each site i, (i=1,2,3,...n), which is estimated as a function of a regional estimate of the standard deviation of annual peaks at site i, the recurrence interval of the dependent variable, and the number of years of record at site i. The off-diagonal elements of Λ are the sample covariance of the estimated T-year peaks at sites i and j. These off-diagonal elements are estimated as a function of a regional estimate of the standard deviation of annual peaks at sites i and j, the recurrence interval of the dependent variable, and the number of concurrent years of record at sites i and j (Tasker and Stedinger, 1989). The p by p matrix {XTΛ-1X}-1, along with values of γ2 for each equation in table 1, is shown in table 2A. The mean square error of a prediction, in square log (base 10) units, at a specific ungaged site can be estimated as

MSEp = γ2 + MSEs .

To estimate the average prediction error for a region, MSEp is computed for each gage site as if it were an ungaged site. An appropriate basin characteristic for x0 is chosen, an average for all the gaged sites is computed and its square root calculated. This result, APElogs, is in log (base 10) units. The average prediction error, APE, in percent, can be calculated as

APEpercent = ,

where MSEp is (ASElogs)2. The values for APEpercent for each equation in each region are shown in table 1. Consider the process of estimating error for a particular application of one of the regional equations in

table 4. Taking the example of the 2-year recurrence-interval matrix for the North Region in table 2A,

MSEs = ,

the resulting estimate of mean square error of prediction is the scalar function of log A0 given as

MSEp = 0.013303 + 0.0020084 + 2(-0.00075628 log A0) + 0.00036696 (log A0 )2.

A value of the independent variable, A0 = 0.13 square mile, gives

MSEp = 0.0169395,

resulting in

APEpercent = 30.7.

This value differs from the average prediction error of 28.0 percent (table 1) by 2.7 percent. All prediction values fall within the shaded area shown in figure 3.

100 e5.3019MSEp( )

1–0.5

1 Alog 0 0.0020084 0.00075628–

0.00075628– 0.000366961A0log

70 Estimating Annual Peak Discharges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

Table 2A. Matrix [χΤΛ−1 χ]−1 and values of γ2 for each flood estimating equation by region and recurrence interval for rural, unregulated streams in West Virginia

North Region

1.1-year recurrence interval, γ2=0.17076E-01 0.22449E-02 -0.85898E-03 -0.85898E-03 0.42857E-03

1.2-year recurrence interval, γ2=0.14983E-01 0.21106E-02 -0.80042E-03 -0.80042E-03 0.39359E-03

1.3-year recurrence interval, γ2=0.14048E-01 0.20492E-02 -0.77365E-03 -0.77365E-03 0.37770E-03

1.4-year recurrence interval, γ2=0.13531E-01 0.20148E-02 -0.75867E-03 -0.75867E-03 0.36884E-03

1.5-year recurrence interval, γ2=0.13217E-01 0.19936E-02 -0.74947E-03 -0.74947E-03 0.36341E-03

1.6-year recurrence interval, γ2=0.13022E-01 0.19805E-02 -0.74376E-03 -0.74376E-03 0.36005E-03

1.7-year recurrence interval, γ2=0.12903E-01 0.19724E-02 -0.74026E-03 -0.74026E-03 0.35799E-03

1.8-year recurrence interval, γ2=0.12829E-01 0.19674E-02 -0.73806E-03 -0.73806E-03 0.35669E-03

1.9-year recurrence interval, γ2=0.12789E-01 0.19646E-02 -0.73686E-03 -0.73686E-03 0.35599E-03

2-year recurrence interval, γ2=0.13303E-01 0.20084E-02 -0.75628E-03 -0.75628E-03 0.36696E-03

2.5-year recurrence interval, γ2=0.12887E-01 0.19713E-02 -0.73977E-03 -0.73977E-03 0.35770E-03

3-year recurrence interval, γ2=0.13207E-01 0.19930E-02 -0.74919E-03 -0.74919E-03 0.36325E-03

Table 2A. Matrix [χΤΛ−1 χ]−1 and values of γ2 for each flood estimating equation by region and recurrence interval for rural, unregulated streams in West Virginia

[These matrices and γ2 can be used to compute the standard error of a pre-diction, MSEp, as explained in the text of this appendix. Numbers are given in scientific notation; for example, 0.20007E-02 = 0.0020007. γ2 is the model error variance]

Appendix 2 71

72 Estimating Annual Peak Disc

East Region

1.1-year recurrence interval, γ2=0.43831E-01 0.30460E-02 -0.11252E-02 -0.11252E-02 0.65451E-03

1.2-year recurrence interval, γ2=0.37710E-01 0.27721E-02 -0.10061E-02 -0.10061E-02 0.57903E-03

1.3-year recurrence interval, γ2=0.34363E-01 0.26204E-02 -0.94026E-03 -0.94026E-03 0.53743E-03

1.4-year recurrence interval, γ2=0.32125E-01 0.25179E-02 -0.89582E-03 -0.89582E-03 0.50946E-03

1.5-year recurrence interval, γ2=0.30479E-01 0.24420E-02 -0.86292E-03 -0.86292E-03 0.48879E-03

1.6-year recurrence interval, γ2=0.29203E-01 0.23827E-02 -0.83727E-03 -0.83727E-03 0.47271E-03

1.7-year recurrence interval, γ2=0.28179E-01 0.23348E-02 -0.81657E-03 -0.81657E-03 0.45976E-03

1.8-year recurrence interval, γ2=0.27330E-01 0.22950E-02 -0.79934E-03 -0.79934E-03 0.44900E-03

1.9-year recurrence interval, γ2=0.26615E-01 0.22612E-02 -0.78477E-03 -0.78477E-03 0.43990E-03

2-year recurrence interval, γ2=0.25063E-01 0.21930E-02 -0.75555E-03 -0.75555E-03 0.42133E-03

2.5-year recurrence interval, γ2=0.23905E-01 0.21320E-02 -0.72899E-03 -0.72899E-03 0.40521E-03

3-year recurrence interval, γ2=0.22712E-01 0.20742E-02 -0.70413E-03 -0.70413E-03 0.38980E-03

Table 2A. Matrix [χΤΛ−1 χ]−1 and values of γ2 for each flood estimating equation by region and recurrence interval for rural, unregulated streams in West Virginia—Continued

harges with Recurrence Intervals Between 1.1 and 3.0 Years for Rural, Unregulated Streams in WV

South Region

1.1-year recurrence interval, γ2=0.38257E-01 0.25075E-02 -0.85364E-03 -0.85364E-03 0.39760E-03

1.2-year recurrence interval, γ2=0.33422E-01 0.23192E-02 -0.78101E-03 -0.78101E-03 0.35933E-03

1.3-year recurrence interval, γ2=0.30972E-01 0.22225E-02 -0.74375E-03 -0.74375E-03 0.33977E-03

1.4-year recurrence interval, γ2=0.29435E-01 0.21612E-02 -0.72019E-03 -0.72019E-03 0.32744E-03

1.5-year recurrence interval, γ2=0.28368E-01 0.21184E-02 -0.70373E-03 -0.70373E-03 0.31884E-03

1.6-year recurrence interval, γ2=0.27583E-01 0.20867E-02 -0.69155E-03 -0.69155E-03 0.31249E-03

1.7-year recurrence interval, γ2=0.26983E-01 0.20624E-02 -0.68222E-03 -0.68222E-03 0.30763E-03

1.8-year recurrence interval, γ2=0.26509E-01 0.20431E-02 -0.67482E-03 -0.67482E-03 0.30378E-03

1.9-year recurrence interval, γ2=0.26128E-01 0.20276E-02 -0.66885E-03 -0.66885E-03 0.30068E-03

2-year recurrence interval, γ2=0.22800E-01 0.20219E-02 -0.66676E-03 -0.66676E-03 0.29941E-03

2.5-year recurrence interval, γ2=0.24886E-01 0.19767E-02 -0.64932E-03 -0.64932E-03 0.29053E-03

3-year recurrence interval, γ2=0.24533E-01 0.19621E-02 -0.64375E-03 -0.64375E-03 0.28764E-03

Table 2A. Matrix [χΤΛ−1 χ]−1 and values of γ2 for each flood estimating equation by region and recurrence interval for rural, unregulated streams in West Virginia—Continued

Appendix 2 73