WinTR55 Modeling Multiple Subarea Watersheds

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WinTR-55 Modeling Multiple Sub-area Watersheds
WinTR-55 Development Team
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Sub-Area and Reach Concepts
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Sub-area/Reach Concepts

• Watershed - system of sub-areas and reaches
• Sub-areas - watersheds that generate runoff
• Reaches - represent watershed flow paths (stream
  channels) or structures

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Sub-area/Reach Concepts

• Watershed - system of sub-areas and reaches
• Sub-areas - generate runoff
• feed into the upstream end of reaches
• Reaches or Routing Elements- represent watershed
  stream flow paths or structures
• Channel Routing elements - Stream Reaches
• Structure Routing elements - Reservoir/Structure
  Reaches
• Watershed Outlet - downstream end of the
  watershed (required for all watersheds)

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Schematics
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Data Requirements

• Identification Data - User, State, and County
• Dimensionless Unit Hydrograph
• Storm Data for specific County/State
• Sub-area Data - Name, flows to reach/outlet,
  area, runoff curve number, time of
  concentration
• Reach Data -Name, receiving reach/outlet, reach
  length, Mannings n, friction slope, bottom
  width, average side slopes

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Adding Sub-areas
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Adding Sub-areas
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Adding Stream ReachesandDeveloping Stream Reach
Data
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Adding Stream Reaches

• WinTR-55 Main Window
• Reach Data Window
• Reach Flow Path Window

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Watershed Schematic
MainStem1
EastReach
WestReach
MainStem2
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WinTR-55 Main Window
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Adding Stream Reaches

• WinTR-55 Main Window
• Reach Data Window
• Reach Flow Path Window

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Stream Reach Data

• Data compiled prior to input
• Reach Name
• Name of receiving (or downstream) reach (could be
  Outlet)
• Cross-section data
• Mannings n
• Friction slope
• Bottom Width
• Average side slopes

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Reach Data Window
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Reach Data Window
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Plotted Channel Rating
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Computing Stream Reach Ratings

• Mannings Equation for Channel Flow
• Q discharge (cu ft/s) r hydraulic radius
  A/pw
• A cross-sectional flow area (sq ft) pw wetted
  perimeter (ft)
• s slope of hydraulic grade line (channel slope,
  ft/ft)
• n Mannings roughness coefficient for open
  channel flow

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Trapezoidal Cross-Section
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Reach Data Window
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Adding Stream Reaches

• WinTR-55 Main Window
• Reach Data Window
• Reach Flow Path Window

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Reach Flow Path Window
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Capabilities Limitations

• Number of sub-areas 1 - 10
• Number of reaches 0-10
• Types of reaches Channel or Structure
• Channel Reach
• Routing Procedure Muskingum-Cunge

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Sub-area and Reach Concepts
Modeling Watersheds with Structures
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Sub-area / Reach Concepts
Sub-area A

• Watershed - system of sub-areas and reaches
• Sub-areas - watersheds that generate runoff
• Reaches - represent watershed flow paths (stream
  channels) or structures

Stream Reach 2c
Stream Reach 1b
Outlet
Structure Reach Pond
Sub-area B
Sub-area C
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Sub-area/Reach Concepts

• Watershed - system of sub-areas and reaches
• Sub-areas - generate runoff
• feed into the upstream end of reaches
• Reaches or Routing Elements- represent watershed
  stream flow paths or structures
• Channel Routing elements - Stream Reaches
• Structure Routing elements - Reservoir/Structure
  Reaches
• Watershed Outlet - downstream end of the
  watershed (required for all watersheds)

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Schematics
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Adding Structure ReachesandDeveloping Structure
Data
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Adding Structure Reaches

• WinTR-55 Main Window
• Reach Data Window
• Structure Data Window
• Reach Flow Path Window

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WinTR-55 Main Window
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Adding Structure Reaches

• WinTR-55 Main Window
• Reach Data Window
• Structure Data Window
• Reach Flow Path Window

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Reach Data Window
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Naming Reaches
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Adding Structure Reaches

• WinTR-55 Main Window
• Reach Data Window
• Structure Data Window
• Reach Flow Path Window

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Structure Data Window
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Spillway Types

• Pipe
• Weir

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Pipe Spillway
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Straight Pipe
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Drop Inlet Pipe
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Pipe Flow Equations
where g gravity cd 0.6 Height,
feet Headpipe,feet Stage, feet Dpipe
,inches Apipe,square feet Flowpipe,cfs
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Pipe Flow Assumptions

• Short-tube approximation assumes orifice flow
  through the pipe at all stages
• Reasonable for drop inlet configuration
• May be unreasonable for large straight pipes
• If not appropriate, use other routing models
• SITES
• WinTR-20

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Pipe Flow Assumptions
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Spillway Types

• Pipe
• Weir

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Weir Spillway
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Weir Configuration
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Weir Flow Equations

• where Lweir weir length, feet
• Stage, feet
• Flowweir, cfs

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Weir Flow Assumptions

• Entry of a zero weir length indicates a 90
  v-notch weir
• Other entry for weir length indicates a
  rectangular having vertical sides -
  broad-crested weir

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Plotting Structure Ratings
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Structure Reach Routing
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Storage-Indication Routing Method

• Estimates how the hydrograph changes as it flows
  through a structure
• DStorage (inflow - outflow) Dt

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Structure Reach Routing
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Structure Routing Plot
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Adding Structure Reaches

• WinTR-55 Main Window
• Reach Data Window
• Structure Data Window
• Reach Flow Path Window

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Reach Flow Path
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Capabilities Limitations

• Structure Routing Storage-Indication
• Structure Types Pipe or Weir
• Structure Trial Sizes 1-3

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WinTR-55 Web Site

• Download latest WinTR-55 version
• http//wsi.nrcs.usda.gov/products/W2Q/HH/Tools_Mo
  dels/WinTR55.html
• Update notes
• WinTR-55 User Manual
• WinTR-55 Support Team e-mail address
• ug-orportlan-4-TR55

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Development Team

• Claudia Hoeft NRCS, Washington DC
• Laurel Foreman NRCS, Iowa
• William Merkel NRCS-WNTSC, Maryland
• Helen Fox Moody NRCS-WNTSC, Maryland
• Quan D. Quan NRCS-WNTSC, Maryland
• Ralph Roberts ARS, Maryland
• John McClung NRCS-NWMC, Arkansas
• Al McNeill NRCS, South Carolina
• Jolyne Lee NRCS-NWCC, Oregon
• Don Woodward NRCS-retired
• Jon Werner NRCS-retired
• Roger Cronshey NRCS-retired