1 example problem 378 & 410 gss. 2 training objectives be able to flood route a 378 pond and...
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EXAMPLE EXAMPLE PROBLEMPROBLEM
378 & 410 GSS378 & 410 GSS
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TRAINING OBJECTIVESTRAINING OBJECTIVES
• Be able to flood route a 378 pond and design a pond without and with a pipe.
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Slide 3
PERM,POOL
TAILWATER ELEV
EXIT CHANNEL
INLET CHANNEL
CREST AUX.. TOP DAM
TAIL-WATER
TOP DAM-FBH +FreeboardCREST AUX.
PERM. POOL
FBH SDH PSH
CONDUIT
CREST PS
DESIGN FLOW (SDH)
TAIL-WATER
AUX. SPLWY.
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SITES 378 PROBLEM
A. GIVEN:
Drainage Area = 103 acres. Hazard Class = A1 RCN = 72 W/S length = 987’ with a slope of 2% Auxiliary Spillway Crest=Permanent Pool @ Elev. 103.6feet. No principal spillway Valley Floor Elevation - 88 feet
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Structure Data
Elev. (ft) Surface Area (Ac.)85.5 089.5 0.396.4 1.2100 4.8104.3 10.8106 11.8
107 12.4
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Rainfall: Design FBH = 8.95”
Rain distribution: Read in a 24-hr duration, rain table
No Principal Spillway Auxiliary Spillway located at 103.6 EL.
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T = Total Hydraulic Stress – lb/ft2T = Vegetal Stress + Effective Soil StressT = Tve +Te
Auxiliary Spillway has a CL material with PI=15
Allowable effective soil stress=0.05 lb/ft2
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8 DAM CENTERLINE Centerline Dam Valley Profile Data:
Station (ft.) /Elev. (ft.)
0/107 26/106 69/104.3
99/103 133/100.8 163/99.6
193/98.4 223/96.9 253/96.4
283/93.6 321/89.5 371/94
401/95.2 421/95.8 451/96.9
491/103.3 521/107
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Embankment Data:
Top Width = 12’Upstream side slope = 4:1Downstream side slope =
4:1No Wave Berm WidthNo Stability BermsCrown = 0
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10Auxiliary Spillway Data: We want to do a Stability & Integrity Analysis of the Spillway. You set the crest at 103.6
Station at DS end of Crest = 620Inlet length of the auxiliary spillway is about 230 ft.Profile or spillway inlet template data
(x,y) (distance, drop): 50’/0’; 280’/3.0’Bottom Width: 30 feetSpillway sideslope = 3:1Spillway slope 3% (constructed exit
channel)
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50’
280’
3’
Inlet Spillway Template
Z = 3:1
BW = 30’
Tie-in Station 6+20
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Spillway Geology and Vegetation Spillway Geology and Vegetation Data:Data:
Material in spillway - Clay (CL)PI or (lw) = 18The representative soil particle size D75 = 0.0024 inchesPercent Clay = 28% (in material in spillway)Dry Density of the clay = 92 pcfHeadcut Erodability Index = 0.1Vegetative Retardance Curve Index = 5.6 (Inlet)Vegetative Retardance Curve Index = 5.6 (Outlet)
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13Assume 2 foot (2’) of rooting depth in spillwayOne foot (1’) of topsoil will be installed in the constructed channel. CL-PI=15The topsoil D75 is 0.02”.Cover Factor (assume good) bromegrass = 0.7 - 0.8Maintenance Code (assume good in constructed ) = 1Maintenance Code (assume minor irr. in natural ) = 2
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Coordinates of top of material: Sta. (ft.)/ Elev. (ft.)
100/85; 310/95; 410/106; 500/107; 700/106; 750/100; 930/95; 960/90; 1000/84
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Erosion resistant soil @ 3% exit slope.Allowable velocity = 7.0 fps.
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Smooth Bromegrass is a cool-season grass introduced into the United States from Hungary in 1884 -This leafy and sod-forming perennial spreads aggressively through both seeds and rhizomes. It grows 15 to 30 inches high and flowers during late spring and early summer in an open panicle.
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T = Total Hydraulic Stress – lb/ft2T = Vegetal Stress + Effective Soil StressT = Tve +Te
Allowable Vegetal Stress=Tva = 0.75 CiCi = Retardance Index@ Ci = 5.6Tva = 4.2 lbs/ft2 - Allowable vegetal stressTa= Allowable Total Hydraulic Stress=4.2 + .05= 4.25
lb/ft2
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18PART A
FIND: Save Separate Files
1. Is this an acceptable pond design without a pipe? Y / N
A. Top of Dam= _________ EL.B. Settled Volume= ____________ CY
2. Remove all vegetation. (HINT-n=.0156. For fine-grained, cohesive soils, the value of n is taken as 0.0156) Is this an acceptable pond design without a pipe? Y / N
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PART B: Use PART A input as a start.
This pond has gullies in the upstream area of the pool. Need to design a GSS for this site. Permanent Pool @ Elev. 100.0 ft. This will cover headcuts with 2.0 ft. of water. Crest of principal spillway = 100.0 ft EL. Volume of sediment between principal and aux spw = 0.0 AF. Rainfall: PSH=1 day = 7.5”Principal Spillway Data: (Single Stage Circular Conduit)
Number of Conduits = 1Length of Conduit = 114 feetDiameter of Conduit = 12”Conduit “n” = 0.013Ke = 1.0HGL at outlet of conduit = 89.5 feet.Riser weir length = 6.28 feet. (24 inch dia.)
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No Wave Berm WidthNo stability BermsCrown = 1.0’
Auxiliary Spillway Data: We want to do a Stability & Integrity Analysis of the
Spillway. Let the program set the crest of the auxiliary spillway.
1. What is the Auxiliary Spillway Crest (ASC) _________EL.2. What is the Top of Dam (TOD) ____________EL.3. What is estimated construction volume ________CY.4. What is effective soil stress_____________lb/ft2. 5. What is the integrity distance for the spillway
analyzed.
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Part C Use Part B file as a start
Rainfall: PSH=1 day = 7.5”Use a Hood Inlet with same diameter and pipe length as
the pipe drop.Distance to bend 100’ and bend to outlet 14’.The elevation of the bend is 90 and the outlet is 89.Say the Mannings “n” = 0.013Circular weir coeff. -- 0.6Entrance coeff. -- 1.0
1. What is the Auxiliary Spillway Crest (ASC) _________EL.2. What is the Top of Dam (TOD) ____________EL.3. What is estimated construction volume ________CY.
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Part D Use Part B input file as a start
Add stability berm on the down stream side at 5’ with 25’ top width. Add a wave berm width =20’ on the front slope.
1. What is estimated construction CY?.
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Right Click on the Start button, and Select Explore.
Management of files
FOLLOW ALONG
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Highlight Local Drive (C:)
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Click - File/New/Folder
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2. Exit Explore
1. Type “SITESWorkshop” and enter
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1. Left Click the Start button/All Programs/Engineering
Applications/SITES/SITES 2005
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File / New File / New ProjectProject
Locate SITESWorkshop
and Double Click
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File / New File / New ProjectProject
Click OKTYPE EX1
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File / New FileFile / New File
File/New File
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File / Save AsFile / Save As
File/Save As
Click Save
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HOME SCREEN
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Navigating in SITES
• Home Screen
• Schematic
• Input Screens
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Schematic
• Editing File
• Dbl-click element to edit
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Input Screen -Typical• Editing data
element on schematic
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File / ContinueFile / Continue
File/Continue
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Enter Data /Next Screen
4. Class (a) dams that have a product of storage times the effective height of the dam of 3,000 or more, those more than 35 ft in effective height, and all class (b) and class (c) dams shall meet or exceed the requirements specified in Technical Release No. 60 (TR-60).
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Watershed SchematicWatershed Schematic
Click to Add Structure
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Watershed SchematicWatershed Schematic
Double Click to Add Data
For This Structure
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Watershed InformationWatershed Information
Input Data and Click
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Structure Data TableStructure Data Table
InPut Data and Click
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Watershed DataWatershed Data
Input Data and Click
NRCS Curve Number Method
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Rainfall DataRainfall Data
Input Data and Click
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Rainfall Distribution Rainfall Distribution TableTable
Click Open
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Rainfall Distribution Rainfall Distribution TableTable
Input Data and Click
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Pool DataPool Data
Include planned aerated sediment, for life of structure. (optional)
Include planned submerged sediment, for life of structure.
Start Routing is required.
Input Data and Click
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Principal Spillway TypePrincipal Spillway Type
Input Data and Click
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Valley ElevationsValley Elevations
Input Data and Click
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Valley ElevationsValley Elevations
Input Data and Click
Enter
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Valley ElevationsValley Elevations
Input Data and Click
Enter
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Valley ElevationsValley Elevations
Input Data and Click
Enter
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Valley ElevationsValley Elevations
Input Data and Click
Enter
Click Next Screen
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Embankment TemplateEmbankment Template
Input Data and Click
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Auxiliary Spillway (AS) CrestAuxiliary Spillway (AS) Crest
Click
Click
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Auxiliary Spillway (AS) Auxiliary Spillway (AS) CrestCrest
Input Data and Click
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Tie Station Definition
• Downstream end of the level crest section of auxiliary spillway
• Ties station together for:– Auxiliary spillway inlet template – Geologic materials in auxiliary spillway exit
channel
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50’
280’
3’
Inlet Spillway Template
Z = 3:1
BW = 30’
Tie-in Station 6+20
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63Auxiliary Spillway Inlet Auxiliary Spillway Inlet TemplateTemplate
Click
Tie-in Station 6+20
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64Auxiliary Spillway Exit Auxiliary Spillway Exit TemplateTemplate
Input Data and Click
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65Auxiliary Spillway Exit Auxiliary Spillway Exit TemplateTemplate
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66Auxiliary Spillway Exit Auxiliary Spillway Exit TemplateTemplate
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67Auxiliary Spillway Cross Auxiliary Spillway Cross SectionSection
Input Data and Click
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Auxiliary Spillway Auxiliary Spillway MaterialMaterial
Input Data
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Auxiliary Spillway Auxiliary Spillway MaterialMaterial
Input Data and Click
Next Screen
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Topsoil Fill And General Topsoil Fill And General FillFill
Input Data
Click
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Topsoil Fill And General Topsoil Fill And General FillFill
Input Data and Click
Next Screen
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Output OptionsOutput Options
Input Data and Click
Next Screen
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Watershed SchematicWatershed Schematic
File / Home Screen
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Home ScreenHome Screen
File / Save As Save
Yes
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Home ScreenHome Screen
Build / Check FIle
Click
Build / Build File
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Home ScreenHome Screen
View / Summary Table
Click to Highlight
View Text
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Output TextOutput Text
Edit/Find
Click
Click
Adjust Side Bar
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Output TextOutput TextMaximize
Ta=.05 lb/ft2.OK
Velocity < Va=7.0 fps.OK
Tve=T-Te=1.66 lb/ft2.Less than allowable of 4.2 lb/ft2
OK
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Output TextOutput TextFile/Exit
ASC=103.6 El.TOD=106.4 El.
Volume=8435 CY
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Output TextOutput Text
File/Exit
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Home ScreenHome Screen
File/Save AsA2EX1nopipe.d2c
Finish EX1
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The End
• “The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable sex, marital status, family status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual’s income is derived from public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at 202-720-2600 (voice and TDD).
• “To file a complaint of discrimination write USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) 202-720-6382 (TDD). USDA is an equal opportunity provider and employer.”