Transcript WinTR-55 Modeling Multiple Sub-area Watersheds WinTR-55 Development Team

WinTR-55
Modeling Multiple Sub-area
Watersheds
WinTR-55 Development Team
Sub-Area and Reach
Concepts
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
B
A
C
Reach 2e
D
E
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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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Sub-area C
Schematics
Legend:
Storage Area
Outlet
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Sub-Area Inflow Points
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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, Manning’s “n”, friction slope, bottom width,
average side slopes
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Adding Sub-areas
Adding Sub-areas
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Adding Stream Reaches
and
Developing Stream Reach
Data
Adding Stream Reaches
1. WinTR-55 Main Window
2. Reach Data Window
3. Reach Flow Path Window
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Watershed Schematic
Upper Main
County Road
Upper West
Upper East
Middle Main
Lower West
MainStem1
WestReach
Lower East
EastReach
Lower Main
MainStem2
Outlet
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WinTR-55 Main Window
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Adding Stream Reaches
1. WinTR-55 Main Window
2. Reach Data Window
3. 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:
Manning’s “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
Manning’s Equation for Channel Flow:
1.49 2 / 3
Q
Ar
s
n
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 = Manning’s roughness coefficient for open channel flow
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Trapezoidal CrossSection
TW
1
D
z
1
z
BW
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Reach Data Window
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Adding Stream Reaches
1. WinTR-55 Main Window
2. Reach Data Window
3. 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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Modeling Watersheds
with Structures
Sub-area and Reach
Concepts
Sub-area / Reach Concepts
 Watershed system of subareas and
reaches
 Sub-areas watersheds that
generate runoff
 Reaches represent
watershed flow
paths (stream
channels) or
structures
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Sub-area A
N
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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Sub-area C
Schematics
Legend:
Storage Area
Outlet
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Sub-Area Inflow Points
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Adding Structure Reaches
and
Developing Structure Data
Adding Structure Reaches
1.
2.
3.
4.
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
1.
2.
3.
4.
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
Reach and Structure could
be the same Name.
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Adding Structure Reaches
1.
2.
3.
4.
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
Pipe Spillway
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Straight Pipe
P ip e
Height
P ond Sur fa ce @ Spillwa y Cr est
Pipe Head

Stage
Distance
P ond Surfac e @ dista nce abo ve spil lway
C
L
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Drop Inlet Pipe

Height
Pipe Head
Pond Surface @ Spillway Crest
Stage
Distance
Pond Surface @ distance above spillway
Riser and Pipe
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L
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Pipe Flow Equations
where:
g = gravity
Head pipe  Height Stage 
D pipe
24
cd =0.6
Height, feet
Headpipe,feet
Stage, feet
Apipe   (
D pipe
24
Dpipe ,inches
Apipe,square feet
)2
Flowpipe,cfs
Flow pipe  Apipecd 2 gHead pipe  4.8 Apipe Head pipe
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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
Weir Spillway
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Weir Configuration

P on d Su rface @ Sp illw ay C rest
Stage
Distance
Pond S urface @ d istance ab ove spillway
Weir Cre st
Weir
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Weir Flow Equations
Flowbroadcrested  weir  2.8Lweir Stage
1.5
Flowv notch weir  2.5Stage
2.5
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
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
1.
2.
3.
4.
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
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WinTR-55 Web Site
Download latest WinTR-55 version
http://wsi.nrcs.usda.gov/products/W2Q/H&H/Tools_Models
/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
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Claudia Hoeft
Laurel Foreman
William Merkel
Helen Fox Moody
Quan D. Quan
Ralph Roberts
John McClung
Al McNeill
Jolyne Lee
Don Woodward
Jon Werner
Roger Cronshey
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NRCS, Washington DC
NRCS, Iowa
NRCS-WNTSC, Maryland
NRCS-WNTSC, Maryland
NRCS-WNTSC, Maryland
ARS, Maryland
NRCS-NWMC, Arkansas
NRCS, South Carolina
NRCS-NWCC, Oregon
NRCS-retired
NRCS-retired
NRCS-retired
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