immediate flood report #1 - april 17-18 2016 (1)

8/18/2019 Immediate Flood Report #1 - April 17-18 2016 (1)

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MEMORANDUM

DATE: April 25, 2016

TO: HCFCD Flood Watch/Partners

FROM: Jeff LindnerMeteorologist / Flood Watch Coordinator

RE: Immediate Report – # 1 April 17-18, 2016 Storm and Flood Information

This is the first report summarizing the historic flooding from rainfall that occurredacross Harris County late on the evening of the 17 th into the 18 th .

GENERAL FLOODING STATEMENT

A slow moving and powerful upper level storm system over the southwest US combinedwith near record moisture levels for mid-April producing a devastating flood event overthe northern and western portions of Harris County from the evening hours of April 17 th into the day of April 18 th. Rainfall began during the early evening hours in southeast tonorthwest bands across extreme southwest and western Harris County westward intoFort Bend and Waller Counties. Between 8:00 p.m. and 9:00 p.m. thunderstorms beganto greatly intensify and slow their northward movement over Waller County and by lateevening had stalled and began to shift eastward into western Harris County. Excessiverainfall spread across northwest Harris County during the late evening hours of the 17 th

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9900 Northwest FreewayHouston, TX 77092

713-684-4000


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White Oak Bayous for the 6-hr and 12-hr time period. Rainfall over upper Brays Bayouaveraged 7.5-9.5 inches in 12-hr and 6.0-6.5 inches in 2-hr. Along middle and upper

Buffalo Bayou west of the 610 Loop rainfall averaged 6.5-7.0 inches in 6-hr and 7.0-7.5inches in 12-hr.

The largest rainfall amounts measured in Harris County for various durations are shownbelow.

Duration Max Rainfall (in) Duration Max Rainfall (in)5-min 1.0 3-hr 8.315-min 2.2 6-hr 13.930-min 3.4 12-hr 16.71-hr 4.7 24-hr 17.42-hr 7.3 48-hr 17.5

Total Amounts – Total rainfall amounts averaged 12.0-16.0 inches over northwest

Harris County from Katy to Addicks to Waller and over 10.0 inches west of a line fromSpring to Greenspoint to Stafford. Rainfall totals east of US 59 averaged generally lessthan 4.0-6.0 inches.

An average of 7.75 inches of rainfall occurred across Harris County equating to over240 billion gallons of water compared to an average of 5.3 inches and 162 billiongallons of water from the Memorial Day flood of 2015. 80 billion gallons more water fellacross Harris County with the April 2016 event compared to Memorial Day 2015.

Additional rainfall data was obtained from residents in Waller County both within andoutside the upper Cypress Creek watershed who collect rainfall with personal weatherstations. The following totals were reported.


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Willow Creek: at or above the 1% (100-yr) along the entire channelGreens Bayou: above the 1% (100-yr) west of I-45; between the 50% (2-yr) and 10%

(10-yr) east of I-45Halls Bayou: between the 20% (5-yr) and 4% (25-yr) west of Airline; less than the 50%(2-yr) east of AirlineWhite Oak Bayou: above the 1% (100-yr) west of Beltway 8; between the 20% (5-yr)and 4% (25-yr) east of Beltway 8Brays Bayou: 4% (25-yr) to 2% (50-yr) west of Gessner; less than 10% (10-yr) east ofGessnerKeegans Bayou: 4% (25-yr) along the entire channelBuffalo Bayou: 4% (25-yr) west of Beltway 8; 10% (10-yr) east of Beltway 8West Fork of San Jacinto River: 10% (10-yr) along the entire channel

The rainfall totals over the headwaters of Cypress Creek in Waller County and extremewestern Harris County far exceeded the 0.2% (500-yr) rainfall frequency for the 6 and12 hour time periods. These rainfall amounts were simply “off the charts” and there islittle skill in attempting to place a return frequency on such large rainfall in such a shortperiod of time. The following table provides the best estimates to quantify the incrediblerainfall amounts.

Location Rainfall Duration ExtrapolatedReturn FrequencyPattison (Waller County) 23.50 in 14.5-hr ~ 10,000 yr (0.01%)Pattison (Waller County) 21.93 in 24-hr ~ 2,000 yr (0.05%)Monaville (Waller County) 19.30 in 10-hr ~ 2,500 yr (0.04%)

Mound Creek at Mathis 16.70 in 12-hr ~ 1,000 yr (0.1%)Langham Creek at W Little York 16.60 in 12-hr ~ 900-yr (0.11%Cypress Creek at Sharp Rd 16.10 in 12-hr ~ 900-yr (0.11%Langham Creek at Longenbaugh 15.70 in 12-hr ~ 700-yr (0.14%)


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RAINFALL COMPARISON TO OCTOBER 1994/1998 and APRIL 2009 FLOODS

Until April 17-18, 2016, the floods of record for much of the Cypress and Little CypressCreek watershed was the October 1994 and October 1998 floods, while for Addicks itwas the April 2009 flood. The April 17-18 event exceeded all the previous rainfall eventsfor this portion of the county by several inches. For example the 16.7 inches in 12-hr atMound Creek and Mathis Rd surpassed the October 1994 rainfall by 7.4 inches. The

April 17-18 event is by far one of the most significant rainfall events over the northwestand western portion of Harris County in modern times.

The following rainfall comparison is for the maximum amount during a 12-hr time periodin inches

Location April 16 April 09 October 98 October 94Mound Creek at Mathis 16.7 3.1 8.6 9.3Langham Creek at W Little York 16.6 7.5 3.2 3.4Cypress Creek at Katy Hockley 15.1 7.0 7.9 3.0Spring Creek at Hegar 10.8 3.2 3.9 N/AWillow Creek at SH 249 12.2 N/A 7.6 3.8Bear Creek at FM 529 14.4 10.4 4.3 N/ASouth Mayde Creek at Greenhouse 12.4 7.6 3.1 2.5

CHANNEL FLOODING

Major overbank and structural flooding occurred along the following channels:

Cypress Creek and major tributariesLittle Cypress CreekWillow CreekS i C k


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The following selected locations recorded new record flood levels based on historicalhigh water marks at that location based on gage data (this will be confirmed with high

water marks obtained at the site once complete.)

Watershed Bridge GageElevationFlood

FrequencyPreviousRecord

PreviousRecord Date

Cypress Creek Huffmeister 132.79 ~0.2%(500-yr) 131.63 Oct. 1998Cypress Creek Eldridge 128.71 ~0.2%(500-yr) 126.10 Oct. 1994Cypress Creek Grant 127.52 ~0.2%(500-yr 125.40 Oct. 1994Cypress Creek SH 249 120.51 ~1%(100-yr) 120.50 June 2001Cypress Creek Stuebner-Airline 110.02 ~1%(100-yr) 109.70 June 2001Cypress Creek Kuykendahl 101.35 ~2%(50-yr) 101.30 May 1989Langham Creek W Little York 112.84 ~0.2%(500-yr) 110.70 April 2009Lt Cypress Creek Becker 197.62 ~1%(100-yr) 197.20 July 2012Lt Cypress Creek Cypress Rosehill 161.62 ~0.2%(500-yr) 160.40 July 2012Lt Cypress Creek Kluge 136.84 ~0.2%(500-yr) 136.30 Oct. 1994S Mayde Creek Peek 141.36 ~10%(10-yr) 142.90 Oct. 1998S Mayde Creek Morton 123.74 ~2%(50-yr) 118.62 Sept. 2008Bear Creek Clay 114.86 ~0.2%(500-yr) 114.40 April 2009Horsepen Creek Trailside 118.50 ~1%(100-yr) 112.80 Oct. 2009Cane Island Hwy 90 137.88 ~1%(100-yr) 134.30 April 2009Mason Creek Prince Creek 106.30 ~1%(100-yr) 106.10 April 2009

CYPRESS CREEK OVERFLOWThe incredible rainfall amounts across much of Waller County into western HarrisCounty resulted in widespread and massive overland flows across a large part ofwestern Harris County extending from near US 290 and Cypress Creek westward to the


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ADDICKS AND BARKER RESERVOIRS

Historic rainfall across the Addicks and Barker Reservoir watersheds resulted intremendous inflows into the reservoirs. Peak inflows into Addicks Reservoir between5:30 a.m. and 6:00 a.m. on the 18 th were on the order of 49,150 cfs. In comparison thepeak inflows into Addicks Reservoir in April 2009 were on the order of 40,900 cfs or8,250 cfs lower than April 2016. The peak inflow into Barker Reservoir of 5,360 cfsoccurred around 10:00 a.m. on the 18 th and surpassed the April 2009 peak inflow of2,910 by 2,450 cfs. All 3 of the creeks feeding inflow into Addicks Reservoir appear tohave set new inflow records. House flooding occurred on all the tributaries adjacent to

the reservoir due to these high flows and overwhelmed internal drainage systems priorto the reservoir levels rising.

The following table summarizes the inflows into Addicks and Barker Reservoirs for the April 2009 and April 2016 events in cfs.

Location April 2016 Apri l 2009 Record Flow (year)Bear Creek at Clay Rd 25,500 24,110 25,500 (2016)

Langham Creek at W Lt York 19,100 12,800 19,100 (2016)South Mayde Creek at Groeschke 4,550 ~ 4,000 4,550 (2016)Upper Buffalo Bayou (Barker) 5,360 2,910 11,200 (1945)

Note: Flows are not available from Horsepen Creek (Addicks) or Mason Creek (Barker)

ADDICKS RESERVOIR Addicks Reservoir reached a peak pool elevation of 102.63 ft at 11:45 a.m. on April 23,2016 impounding 122,900 acre-ft of water. The previous record pool elevation of 97.46ft was surpassed by 5.17 ft. At its peak pool elevation, Addicks Reservoir occupied 93%of its government owned land and 60% of its total reservoir capacity. HWY 6 went underwater on April 18 th around 11:45 a.m. and remains under several feet of water at this


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HOUSE FLOODING ESTIMATES

House flooding occurred at many locations across north and western unincorporatedHarris County as well as the City of Houston. As of April 25 th, a total of 5,890 homeshave flood damage with an additional 1,066 apartment units.

Harris County: 3,514City of Houston: 1,685City of Waller: 15Jersey Village: 380

City of Katy: ~ 100City of Tomball: 170West University Place: 7City of Baytown: 3Bellaire: 8Hedwig Village: 6Spring Valley: 4

Damage assessment teams continue to assess areas that were impacted and thesenumbers will continue to change.

HIGH WATER MARKSHCFCD is conducting high water marks along the following channels: Cypress Creekand tributaries, Little Cypress Creek, Willow Creek, Spring Creek, Bear Creek,Langham Creek, Horsepen Creek, South Mayde Creek, Mason Creek, Upper BuffaloBayou/Cane Island Branch, Buffalo Bayou, Brays Bayou, Keegans Bayou, WillowWaterhole, Greens Bayou, Halls Bayou, White Oak Bayou and tributaries, San JacintoRiver.

High water marks are also being conducted at detention basins along the following 4


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experienced excessive rainfall of at or above 1 inch in 15 minutes during theevent.

• 3 HCFCD Flood Warning System gages were inundated by the extreme flowsand destroyed during the flooding.

o Spring Creek at Hegar Rd.o Cypress Creek at Sharp Rdo West Fork San Jacinto at Kingwood Country Clubo White Oak Bayou at Jones Rd (water inundated the PT tube)

HARRIS COUNTY FLOOD CONTROL DISTRICT FACILITIES CONDITIONS

All channels and detention basins were in good conditions prior to the start of the rainfalland flooding, and no blockages had been reported or were observed. The first HCFCDmowing cycle of 2016 will begin in early May, but grass growth along the channels didnot impede storm water flows. HCFCD staff are checking channels and detention basinsfor blockages, erosion, bank failures, and other storm-related problems.

The HCFCD channels and detention basins functioned as designed and helped toreduce flood levels. Where rainfall amounts were near or exceeded the 1%(100-yr)frequency in the county’s northern, northwestern, and western areas, the HCFCDchannels and basins were overwhelmed especially where rainfall amounts were in the0.2% (500-yr) or above frequency range.


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ADDICKSRESERVOIR

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12 HOUR PEAK RAINFALL ISOHYETALS & FLOOD INFORMATIONFOR APRIL 17 - 19, 2016

HARRIS COUNTY FLOOD CONTROL DISTRICTAPRIL 25, 2016

LEGENDPEAK 12 HOUR RAINFALL TOTAL(FROM HCFCD GAGE DATA)

MAJOR FLOODING / HOUSE FLOODING AREAS

OVERBANK FLOODING

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Rainfall Intensity Report4-17-16 2:30 PM through 4-21-16 2:30 PM

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Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site100 0.2 0.6 0.9 1.4 2.6 3.4 4.1 4.1 4.2 4.2 5.3 A100 Clear Lake 2nd Outlet @ SH 146105 0.4 1.0 1.6 2.6 3.6 4.3 4.5 4.6 4.6 4.6 5.2 Mary's Creek @ Melodywood Drive110 0.4 0.9 1.6 2.4 3.5 4.4 4.6 4.6 4.6 4.7 6.0 A100 Clear Creek @ I-45115 0.3 0.8 1.3 2.0 3.0 3.5 3.7 3.8 3.9 3.9 4.7 Cowart Creek @ Baker Road120 0.3 0.8 1.6 2.6 4.0 4.6 4.8 4.9 5.0 5.0 5.6 A100 Clear Creek @ FM 528

125 0.4 0.8 1.3 2.0 2.9 3.6 3.8 3.8 4.0 4.0 5.2 Chigger Creek @ Windsong Lane130 0.4 0.9 1.8 2.9 4.1 4.8 5.0 5.0 5.2 5.2 6.3 A100 Clear Creek @ Bay Area Boulevard135 0.3 0.8 1.4 2.3 3.4 4.1 4.4 4.4 4.6 4.6 5.2 A100 Clear Creek @ FM 2351140 0.4 1.0 1.6 2.6 3.6 4.5 4.8 4.9 5.0 5.0 5.5 A119 Turkey Creek @ FM 1959150 0.3 0.9 1.4 2.3 3.1 3.9 4.2 4.4 4.4 4.4 5.0 A100 Clear Creek @ Country Club Drive160 0.3 0.8 1.2 1.9 2.7 3.3 3.7 3.8 3.9 3.9 4.5 A120 Beamer Ditch @ Hughes Road170 0.4 1.0 1.8 2.5 3.4 4.4 4.9 5.0 5.0 5.0 6.4 A100 Clear Creek @ Nassau Bay180 0.4 0.8 1.4 2.3 3.5 4.2 4.6 4.8 4.9 5.1 5.7 A100 Clear Creek @ Mykawa Road190 0.4 0.7 1.4 2.1 2.8 3.6 4.0 4.1 4.4 4.5 5.8 A100 Clear Creek @ SH 288200 0.3 0.6 1.0 1.7 2.6 3.5 4.4 4.5 4.5 4.5 5.8 A104 Taylor Lake @ Nasa Road 1

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site

210 0.3 0.7 1.3 2.0 2.8 3.6 4.5 4.5 4.6 4.6 5.8 B100 Armand Bayou @ Pasadena Lake (Nasa Road 1)220 0.2 0.7 1.0 1.4 2.5 3.3 4.2 4.4 4.5 4.5 5.3 B100 Armand Bayou @ Genoa-Red Bluff Road230 0.3 0.7 1.1 1.6 2.8 3.8 4.6 4.8 4.9 5.0 6.0 B106 Big Island Slough @ Fairmont Parkway240 0.2 0.6 1.1 1.7 3.2 4.2 5.1 5.3 5.4 5.4 6.4 B100 Armand Bayou @ Beltway 8250 0.5 1.1 1.5 2.0 3.0 3.8 4.4 4.5 4.6 4.6 5.3 B104 Horsepen Creek @ Bay Area Boulevard270 0.2 0.5 0.7 1.1 2.0 2.8 3.7 4.0 4.0 4.0 4.7 B112 Willow Spring Bayou @ Fairmont Parkway

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site310 0.3 0.8 1.3 2.0 3.7 4.4 5.3 5.5 5.6 5.6 6.8 C106 Berry Bayou @ Nevada Avenue320 0.4 0.8 1.3 2.2 3.8 5.3 6.2 6.4 6.5 6.6 8.2 C106 Berry Bayou @ Forest Oaks Boulevard340 0.3 0.6 1.1 1.9 3.6 5.0 5.9 6.1 6.2 6.6 7.3 C100 Sims Bayou @ Telephone Road360 0.3 0.6 0.9 1.5 2.9 3.4 4.2 4.6 4.6 4.7 5.2 C100 Sims Bayou @ Martin Luther King Road

370 0.3 0.6 1.1 1.8 2.6 3.3 4.1 4.3 4.7 5.2 6.1 C100 Sims Bayou @ SH 288380 0.4 1.0 1.4 2.1 3.0 4.0 4.9 5.2 5.6 5.9 6.9 C100 Sims Bayou @ Hiram-Clarke Road

Clear Creek, A100

Armand Bayou, B100

Sims Bayou, C100


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Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1020 0.4 0.7 1.3 2.5 4.1 5.4 6.5 6.9 7.5 7.9 9.4 NRG Park400 0.4 1.0 1.6 3.0 4.6 5.6 6.6 7.0 7.4 7.8 9.5 D109 Harris Gully @ South McGregor Way410 0.4 1.1 1.6 2.5 4.2 4.9 5.6 6.0 6.0 8.3 9.0 D100 Brays Bayou @ Lawndale Street420 0.3 0.8 1.4 2.5 4.0 5.0 6.0 6.4 6.8 7.3 8.7 D100 Brays Bayou @ South Main Street430 0.3 0.9 1.5 2.8 4.6 5.8 6.9 7.4 7.7 8.3 9.0 D100 Brays Bayou @ Stella Link Road435 0.4 0.8 1.3 2.3 4.0 4.8 6.1 6.5 7.2 7.5 8.6 D112 Willow Water Hole @ Willowbend Boulevard440 0.4 0.8 1.4 2.8 4.2 5.4 6.5 6.8 7.6 8.5 9.2 D100 Brays Bayou @ Rice Avenue445 0.3 0.7 1.2 1.9 3.7 4.3 5.6 5.9 6.8 7.2 7.6 D112 Willow Water Hole @ Landsdowne Drive460 0.6 1.5 2.2 3.7 5.3 6.6 7.7 8.1 9.1 9.3 10.6 D100 Brays Bayou @ Gessner Road465 0.8 1.7 2.9 4.4 6.4 7.9 8.9 9.3 10.4 10.5 11.9 D100 Brays Bayou @ Beltway 8470 0.6 1.5 2.4 4.2 6.3 7.6 8.4 9.0 10.3 10.4 11.3 D100 Brays Bayou @ Belle Park Drive475 0.8 1.7 3.0 4.5 6.6 7.8 8.7 9.0 9.9 10.1 11.2 D100 Brays Bayou @ Bellaire Boulevard480 0.4 0.9 1.8 2.9 5.0 6.1 7.4 7.8 9.6 9.6 10.6 D118 Keegans Bayou @ Roark Road485 0.5 1.0 1.9 2.7 4.2 5.3 6.0 7.1 8.3 8.5 9.1 D100 Brays Bayou @ SH 6490 0.4 1.0 1.8 3.4 5.0 6.3 7.3 7.8 9.2 9.3 10.3 D118 Keegans Bayou @ Keegan Road495 0.6 1.6 2.7 3.5 5.8 6.9 7.6 8.7 10.0 10.0 11.6 D118 Keegans Bayou @ Rocky Valley

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site510 0.6 1.2 2.0 3.0 4.4 5.2 6.0 6.6 7.1 7.2 7.6 Harris County Flood Control @ Brookhollow520 0.6 1.2 2.0 3.1 4.5 5.0 5.8 6.3 6.6 6.6 7.1 E100 White Oak Bayou @ Heights Boulevard530 0.5 1.2 1.9 2.8 3.9 4.5 5.4 6.0 6.1 6.2 6.6 E100 White Oak Bayou @ Ella Boulevard535 0.4 1.3 2.0 2.8 3.9 4.4 5.3 6.3 6.8 6.8 7.6 E100 White Oak Bayou @ Pinemont Drive540 0.4 1.1 1.9 2.7 3.8 4.4 6.2 7.8 8.5 8.5 9.5 E100 White Oak Bayou @ Alabonson Road545 0.4 0.9 1.7 2.8 3.6 4.2 7.0 9.1 9.9 10.0 10.5 E100 White Oak Bayou @ Fairbanks North Houston Road550 0.5 1.3 2.4 3.9 4.8 5.4 9.4 11.5 12.3 12.3 13.0 E100 White Oak Bayou @ Lakeview Drive555 0.6 1.6 2.8 4.5 6.1 6.5 10.7 12.1 12.8 12.8 13.9 E100 White Oak Bayou @ Jones Road560 0.4 1.1 1.8 2.6 3.6 3.9 4.6 5.0 5.3 5.4 6.1 E101 Little White Oak Bayou @ Trimble Street570 0.7 1.8 2.2 2.7 3.4 3.8 4.5 5.3 5.7 5.7 6.8 E101 Little White Oak Bayou @ Tidwell Road575 0.4 1.0 1.5 2.2 3.2 3.8 4.6 5.8 6.4 6.4 6.9 E100 White Oak Bayou @ Tidwell Road580 0.5 1.2 1.8 2.7 4.0 4.5 5.3 6.1 6.6 6.8 7.7 E115 Brickhouse Gully @ Costa Rica Road

585 0.5 1.2 1.9 2.6 3.7 4.2 5.9 7.4 8.0 8.0 9.0 E121 Vogel Creek @ Victory Drive590 0.5 1.2 2.1 3.0 3.8 4.4 5.4 6.9 7.6 7.7 8.7 E117 Cole Creek @ Deihl Road595 0.4 1.3 2.1 2.8 4.0 4.4 6.8 8.0 8.6 8.7 9.5 E121 Vogel Creek @ Gulf Bank Road

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site610 0.4 0.8 1.2 1.7 3.0 3.8 4.8 5.0 5.0 5.1 7.2 A104 Taylor's Bayou @ Shoreacres Boulevard620 0.3 0.6 1.2 1.9 3.4 4.5 5.5 5.7 5.8 5.8 6.8 F216 Little Cedar Bayou @ 8th Street640 0.4 1.1 1.6 2.4 4.1 5.0 5.7 5.9 6.0 6.0 7.0 F101 Lateral @ Sens Road

Brays Bayou, D100

White Oak Bayou, E100

Little Cedar Bayou, F216


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Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site710 0.6 1.6 2.1 2.8 3.2 3.5 4.1 4.4 4.6 4.6 5.2 G103 San Jacinto River @ Banana Bend Street720 0.5 1.3 1.8 2.2 2.4 2.5 3.0 3.4 3.5 3.5 3.8 G103 San Jacinto River @ US 90750 0.4 0.8 1.0 1.4 1.4 1.6 2.0 2.5 2.7 2.7 3.5 G103 Lake Houston Dam Spillway755 0.6 1.5 2.6 3.5 3.6 3.7 4.3 5.2 7.3 7.4 7.4 G103 San Jacinto River @ Kingwood Country Club760 0.6 1.4 2.4 3.3 3.4 3.4 5.8 6.6 6.7 6.7 7.4 G103 San Jacinto River @ US 59790 0.6 1.6 2.3 2.6 2.7 2.8 5.4 6.4 6.5 6.5 7.5 G103 East Fork San Jacinto @ FM 1485

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site820 0.6 1.4 2.4 3.2 4.2 4.9 5.6 5.8 5.9 6.0 6.6 H100 Hunting Bayou @ I-10830 0.6 1.3 1.8 2.6 3.7 4.3 5.0 5.3 5.4 5.5 6.5 H100 Hunting Bayou @ Loop 610 East840 0.4 1.1 1.8 2.8 3.6 3.9 4.5 4.9 5.0 5.0 5.8 H100 Hunting Bayou @ Lockwood Drive

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site920 0.4 1.2 1.9 2.6 4.6 5.7 6.6 6.8 6.8 6.8 8.0 I100 Vince Bayou @ West Ellaine Down Stream940 0.5 1.2 2.1 2.8 4.7 5.7 6.7 6.9 7.0 7.0 8.1 I101 Little Vince Bayou @ Jackson Avenue

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1040 0.6 1.6 2.9 3.9 4.6 5.6 9.5 10.6 11.0 11.0 12.1 J100 Spring Creek @ FM 29781050 0.7 1.7 2.4 3.2 4.4 5.3 8.3 9.2 9.4 9.4 11.0 J100 Spring Creek @ I-451060 0.5 1.2 2.1 3.1 4.7 5.5 9.1 10.2 10.5 10.5 11.4 J100 Spring Creek @ Kuykendahl Road1070 0.4 1.1 1.7 2.8 3.9 4.7 8.4 9.7 10.1 10.1 11.7 J100 Spring Creek @ SH 2491090 0.6 1.7 2.7 3.4 5.4 7.1 10.5 10.8 10.8 10.8 11.8 J100 Spring Creek @ Hegar Road

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1110 0.7 2.0 3.4 4.7 4.9 5.0 9.8 10.6 10.8 10.8 12.6 K100 Cypress Creek @ Cypresswood Drive1115 0.6 1.8 2.8 4.5 5.2 5.6 9.1 10.0 10.2 10.4 12.5 K600 Cypress Creek @ Inverness Forest1120 0.7 1.8 2.6 4.3 5.3 5.7 9.2 10.2 10.3 10.3 13.3 K100 Cypress Creek @ I-451130 0.6 1.6 2.7 3.5 4.8 5.1 7.6 8.7 8.9 9.0 11.0 K100 Cypress Creek @ Kuykendahl Road1140 0.8 2.0 3.1 4.0 5.1 5.4 8.2 9.2 9.7 9.8 11.8 K100 Cypress Creek @ Stuebner-Airline Road1160 0.6 1.6 3.1 4.2 5.6 6.2 10.2 12.0 12.6 12.7 14.0 K100 Cypress Creek @ Grant Road1165 0.7 1.7 3.0 4.1 5.6 6.3 11.3 12.7 13.4 13.6 15.1 K100 Cypress Creek @ Eldridge Parkway N.1170 0.6 1.6 2.8 4.2 5.8 7.1 11.8 13.6 14.1 14.5 16.3 K100 Cypress Creek @ Huffmeister Road1180 0.7 1.7 2.8 3.8 6.9 7.2 11.7 15.1 15.7 15.7 17.0 K100 Cypress Creek @ Katy-Hockley Road1185 0.7 1.7 3.0 4.4 6.7 6.9 12.1 16.1 16.5 16.5 16.5 K100 Cypress creek @ Sharp Road1190 0.9 1.8 2.7 4.2 7.1 8.3 13.9 16.7 17.6 17.6 19.0 K166 Little Mound Creek @ Mathis Road1210 0.8 1.8 3.0 4.4 5.8 6.8 10.5 12.2 12.8 13.0 14.7 L100 Little Cypress Creek @ Kluge Road1220 0.6 1.5 2.2 3.2 4.3 4.7 8.0 10.7 11.2 11.2 12.6 L100 Little Cypress Creek @ Cypress Rosehill Road1230 0.6 1.5 2.2 3.2 4.5 5.4 9.1 12.2 12.7 12.7 14.7 L100 Little Cypress Creek @ Becker Road

San Jacinto River, G103

Hunting Bayou, H100

Vince Bayou, I100

Spring Creek, J100

Cypress Creek, K100


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Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1320 0.6 1.6 2.7 3.5 4.3 5.1 8.6 10.0 10.3 10.4 11.4 M100 Willow Creek @ Kuykendahl Road1340 0.7 1.8 2.9 3.7 4.8 5.6 10.7 12.2 12.6 12.6 14.2 M100 Willow Creek @ SH 249

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1420 0.6 1.4 2.2 3.4 4.1 4.6 5.3 5.6 5.6 6.0 6.9 N100 Carpenters Bayou @ I-101440 0.4 1.1 1.8 2.6 3.0 3.4 4.0 4.2 4.3 4.3 5.6 N100 Carpenters Bayou @ Wallisville Road1460 0.6 1.5 2.1 2.8 3.1 3.4 3.9 4.3 4.3 4.3 5.6 N100 Carpenters Bayou @ US 90

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1520 0.6 1.5 2.4 3.0 4.1 5.0 5.6 5.8 5.9 5.9 6.6 O100 Goose Creek @ SH 1461540 0.6 1.4 2.6 3.5 4.4 5.1 5.6 5.8 5.9 5.9 6.6 O100 Goose Creek @ Baker Road

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1600 0.6 1.1 1.3 1.6 1.8 2.1 2.6 3.0 3.0 3.0 3.5 P100 Greens Bayou @ Mount Houston Parkway1610 0.6 1.4 2.2 3.1 4.1 4.6 5.3 5.6 5.6 5.7 6.2 P100 Greens Bayou @ Normandy Street

1620 0.6 1.5 2.0 2.8 3.3 3.7 4.3 4.6 4.7 4.7 5.3 P100 Greens Bayou @ Ley Road1630 0.6 1.4 1.6 1.8 2.0 2.1 2.6 3.0 3.0 3.0 3.4 P130 Garners Bayou @ Beltway 81640 0.5 1.0 1.2 1.4 1.7 1.8 2.5 3.4 3.5 3.5 4.4 P100 Greens Bayou @ US 591645 0.8 2.1 2.7 3.0 3.2 3.3 5.2 6.2 6.4 6.4 7.5 P100 Greens Bayou @ Beltway 81650 0.8 2.0 2.5 2.7 2.8 2.9 3.4 4.3 4.4 4.4 5.3 P130 Garners Bayou @ Rankin Road1660 0.6 1.8 3.3 4.7 5.0 5.2 10.1 11.1 11.2 11.3 12.2 P100 Greens Bayou @ Knobcrest Drive1665 0.8 1.9 3.1 4.5 5.3 5.3 10.3 11.6 12.0 12.0 12.9 P100 Greens Bayou @ Bammel N Houston Road1670 0.6 1.6 3.0 4.4 5.4 5.5 9.5 11.0 11.6 11.6 12.4 P100 Greens Bayou @ Cutten Road1685 0.6 1.6 2.1 2.8 3.2 3.5 4.1 4.4 4.5 4.5 5.4 P100 Greens Bayou @ Tidwell Road1695 0.6 1.5 2.0 2.2 2.5 2.6 4.1 5.2 5.4 5.4 6.1 P138 @ Aldine Westfield Road

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site

1675 0.5 1.2 1.7 2.3 2.8 3.2 3.7 4.2 4.2 4.2 5.2 P118 Halls Bayou @ Tidwell Road1680 0.4 0.8 1.2 1.8 2.3 2.5 3.1 3.6 3.8 3.8 4.6 P118 Halls Bayou @ Jensen Drive1690 0.4 1.2 1.8 2.2 2.6 2.9 4.0 5.4 5.8 5.9 6.8 P118 Halls Bayou @ Airline Drive

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1720 0.5 1.0 1.6 2.6 3.3 3.8 4.4 4.6 4.6 4.8 6.4 Q100 Cedar Bayou @ SH 1461730 0.7 1.5 2.1 2.8 3.3 3.5 4.0 4.2 4.2 4.2 5.3 Q100 Cedar Bayou @ FM 19421740 0.6 1.0 1.4 1.8 2.0 2.0 2.6 3.3 3.4 3.4 4.8 Q100 Cedar Bayou @ US 90

Halls Bayou, P118

Cedar Bayou, Q100

Greens Bayou, P100

Willow Creek, M100

Carpenters Bayou, N100

Goose Creek, O100


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Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1840 0.6 1.1 1.4 1.7 1.9 2.0 2.5 3.0 3.1 3.1 3.5 R102 Gum Gully @ Diamond Head Boulevard

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1940 0.5 1.4 2.2 2.6 2.7 2.8 3.3 4.1 4.2 4.2 5.2 S100 Luce Bayou @ FM 2100

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site2010 0.6 1.4 2.6 4.3 5.4 6.2 7.0 9.4 10.6 10.7 11.2 Barker Dam2020 0.4 1.2 2.2 3.3 4.4 5.2 7.0 11.8 12.7 12.8 13.3 T101 Mason Creek @ Prince Creek Drive2040 0.4 0.8 1.4 2.2 3.5 5.0 7.0 10.4 11.3 11.4 12.0 T100 Buffalo Bayou @ US 90

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site2110 0.6 1.6 2.5 4.2 5.2 5.9 6.9 8.8 10.0 10.1 10.4 Addicks Dam2120 0.7 1.6 2.5 4.2 7.1 7.5 13.6 16.6 17.4 17.5 19.1 U100 Langham Creek @ West Little York Road2130 0.6 1.4 2.3 3.9 6.2 7.3 12.5 14.9 15.7 15.8 16.9 U106 Horsepen @ Trailside Drive2140 0.6 1.6 2.8 4.4 7.3 7.7 12.4 15.7 16.3 16.4 17.2 U100 Langham Creek @ Longenbaugh Road

2150 0.6 1.5 2.8 4.1 5.1 5.8 9.9 14.1 15.1 15.3 15.9 U101 South Mayde @ Greenhouse Road2160 0.5 1.3 2.5 3.9 6.0 6.4 10.9 14.3 15.2 15.2 16.0 U102 Bear Creek @ Clay Road2170 0.6 1.7 2.6 4.5 6.2 6.8 9.8 13.8 14.6 14.7 15.4 U101 South Mayde @ Morton Road2180 0.5 1.3 2.4 3.7 7.1 7.5 10.4 14.4 15.0 15.0 15.7 U102 Bear Creek @ FM 5292190 0.5 1.1 2.0 3.4 6.4 7.0 9.2 13.7 14.4 14.5 14.9 U101 South Mayde Creek @ Peek Road

Sensor ID 5-min 15-min 30-min 1-hour 2-hour 3-hour 6-hour 12-hour 1-day 2-day 4-day Site1000 0.4 1.0 1.9 2.8 4.4 5.2 6.1 6.6 7.0 7.1 7.5 Houston Transtar2210 0.5 1.2 1.9 2.7 4.3 5.4 6.1 6.4 6.5 8.3 9.2 W100 Buffalo Bayou @ Turning Basin2220 0.5 1.4 2.3 3.2 4.6 5.1 5.6 6.1 6.3 6.4 8.6 W100 Buffalo Bayou @ Milam Street2240 0.4 0.8 1.6 2.9 4.5 5.2 6.0 6.5 6.8 6.8 7.6 W100 Buffalo Bayou @ Shepherd Drive2250 0.7 1.4 2.8 4.0 5.4 6.0 6.8 7.5 8.3 8.4 9.0 W140 Spring Branch @ Bingle Road

2255 0.7 1.5 2.8 4.1 5.4 6.2 6.9 7.5 8.3 8.4 9.1 W140-01 Briar Branch @ Campbell Road2260 0.5 1.3 1.9 3.0 4.8 5.7 6.4 6.9 7.8 7.8 8.6 W100 Buffalo Bayou @ San Felipe Drive2270 0.8 1.7 2.9 4.4 6.5 7.6 8.3 8.8 9.8 10.0 10.5 W100 Buffalo Bayou @ West Beltway 82290 0.6 1.5 2.5 4.0 5.6 6.3 7.2 8.3 9.6 9.7 10.2 W100 Buffalo Bayou @ Dairy Ashford Road

Jackson Bayou, R100

Luce Bayou, S100

Barker Reservoir, T100

Addicks Reservoir, U100

Buffalo Bayou, W100


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immediate flood report #1 - april 17-18 2016 (1)

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