USDANRCS WinTR20

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USDANRCS WinTR20

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Title: USDANRCS WinTR20

1
USDA-NRCS WinTR-20

Hydrology Model Basic Tutorial

This tutorial demonstrates the new WinTR20 model.
Using a simple example, you will learn how to
Create an Input File
Run WinTR-20
View Output

3
Example Problem

3 Sub-areas
- Sub-area 1 contains a floodwater retarding
structure.
Storm Analysis
- Determine peak flows for 5- and 100-year,
24-hour rainfalls. Assume the site is located in
a Type II Rainfall Distribution area.

4
WinTR-20 Sub-area / Reach Concepts

Stream Reaches represent the main flow paths
that the hydrographs are routed through. They
can accommodate one of two forms of routing
Storage Routing (lakes, dams, wetlands, etc.) or
Reach Routing (stream or river channels).
All WinTR20 modeled watersheds end with the final
stream reach terminating at an Outlet.

5
WinTR-20 Sub-area / Reach Concepts

WinTR20 represents the watershed as a system of
sub-areas and reaches.
Sub-areas are the separate individual drainage
areas that generate the hydrographs that feed
into the upstream end of a stream reach.

6
Schematic For Example Problem
Reach 2
Sub-area 2
Outlet
(Reach Routing)
Sub-area 3
Reach 1
(Storage Routing)
Legend
Sub-area 1
Storage Structure
Sub-Area Inflow Points
7
Data Sources

The data presented in the next 5 slides have been
gathered prior to inputting into WinTR20.
The data include
Sub-area Watershed Characteristics
Stream Reach Hydraulics
Storage Structure Hydraulics
Evaluation Storm Amounts and Distribution

8
Sub-area Parameters
9
Reach Parameters
10
Reach 1 Structure Data

Example problem assumes pool is empty (EL 2423.0)
when storm begins.

11
Reach 2 Rating Table

Data derived from HECRAS, Mannings, etc.
Reach Length 5400 feet, Bankfull Elevation
2422.5

12
Storm Data

5-Year 24-hour Rainfall Amount 3.7
100-year 24-hour Rainfall Amount 6.2
Use Type II 24-hour Rainfall Distribution
(built-in to WinTR20)

13
Getting Started - The Initial WinTR-20 Editor
Screen

Using Windows Explorer, go to the WinTR-20
Executables directory and click on
The following WinTR-20 System Controller/ Editor
Screen comes up

14
WinTR20 Controller / Editor Screen

Click on the File menu
From the drop down menu, select New WinTR-20
File

15
WinTR20 Identifier Record

The next screen to appear is the WinTR-20
Identifier Record.
Enter the units to use (English or Metric),
Minimum Hydrograph Value (when to begin and end
display of hydrograph) and a watershed
description.
Accept Changes then Close is selected to
complete this record.

16
Input Data Main Menu

The screen at right comes up next. Select data
type to be input here.
This example will require data describing
Sub-area
Stream reach
Structure rating
Stream Cross Section
Storm Analysis
Start this example by clicking on Sub-Area

17
Entering Sub-Area Data

Enter data as shown for all three Sub-Areas.
Sub-Area and Sub-Area Reach Identifier are user
defined alpha-numeric names.
Sub-Area Reach Identifier refers to the Reach
that will receive the Sub-Areas hydrograph.

18
Entering Sub-Area Data

If a built-in rainfall distribution is being used
for the whole watershed, Rain Gage Identifier
is left blank
Note output being requested for this Sub-Area
peak flow and hydrograph

19
Entering Sub-Area Data (continued)

After data for Area 1 has been entered, simply
highlight the box containing Area 1 then type
Area 2. Begin entering Area 2s data. Repeat
for Area 3. Click Accept Changes (Close)
button when finished.

20
Getting Help

To get help at any time on input parameters,
simply click on the yellow text for that input.
A screen then appears with a description of the
parameter.
To close the help window, click on the input text
line again.

21
Entering Stream Reach Data

After all the sub-area data has been entered and
accepted, the user is returned to the main input
editor menu.
Next, click on Stream Reach to enter reach
data.

22
Stream Reach Data

Use pull down menu to select the stream reach
needing input.
The names that will appear in this pull down menu
were defined during the Sub-Area data entry
section (Sub-Area Reach Identifier).

23
Stream Reach 1 Data

Reach 2 is the receiving reach for Reach 1.
Reach 1 is a structure-type routing. The
structure rating data (entered later) will be
identified as Struct 1.
Since this is a structure routing, no channel or
valley lengths are used.

24
Stream Reach 2 Data

Outlet (end of the watershed) is the receiving
reach for Reach 2.
Reach 2 is a channel-type routing. The channel
rating data (entered later) will be identified as
Xsec 2.
Channel and valley lengths are the same in this
example. No baseflow is assumed for this reach.

25
Entering Structure Data

After the Stream Data was entered and accepted,
the user is returned to the main input menu.
From here Structure Rating was entered to
bring up the screen on the right.
From the pull-down menu Struct 1 is selected.

26
Entering Structure Data

Enter data one line at time using the structure
elevation, discharge and storage entry cells on
the left.
Leave Starting Elevation blank. This has
WinTR20 start the routing at the lowest elevation
in the rating table.
Click on Accept Changes (Close) button when
finished.

27
Entering Structure Data

The user can click on Display Data for a
graphical view of the data just input.

28
Entering Stream Cross Section Data

After the Structure Data was entered and
accepted, the user is returned to the main input
menu. From here Stream Cross Section was
selected to bring up the screen on the right.
On the pull down menu, Xsec 2 is selected.

29
Entering Stream Cross Section Data

Entered the required data.
Cross Section Data entry is similar to the
Structure Data - Use entry cells to the left and
enter data one line at a time.
Click on Accept Changes (Close) button when
done.

30
Entering Stream Cross Section Data

The user can click on Display Data for a
graphical view of the data just input.

31
Entering Stream Cross Section Data

Notes on Cross Section Data
Data usually prepared ahead of time using water
surface profile programs such as HECRAS.
Bankfull Elevation represents the point at
which flow transitions from channel to
floodplain.
Low ground may be left blank.
Stream Identifier and Stream Station may be left
blank (used only for NRCS Economic Analysis)

32
Entering Storm Data

After the Cross Section data has been accepted
and closed, the user is returned to the main
input editor menu.
Select Storm Analysis to enter rainfall amounts
and distribution.

33
Entering Storm Data

Enter the 5- and 100-year rainfall amounts,
distribution type, and Antecedent Runoff
Condition (ARC - Default is 2).
The Storm Identifier can be any alpha-numeric
string.
The screen to the right shows the user selecting
the Type II Rainfall Distribution from the
pull-down menu.

34
Entering Storm Data (continued)

The screen to the right shows the Storm
Analysis window after data has been entered for
both events.
The data entry is completed by clicking Accept
Changes (Close) button.

35
Entering Storm Data (continued)

Storm Analysis Input Notes
Rain Gage Identifier is not required if TR20
is executed using the same rainfall amount and
distribution over the entire watershed.
2-Yr 24-Hr Rainfall is not required unless the
Time of Concentration computation option for any
Sub-Area is used.

36
Saving Input File

After accepting the Storm Analysis data, the user
is returned to the WinTR20 Input Editor Main
Menu.
From the File menu, select Save As to give a
file name and saving location.

37
Checking Data Prior to Running WinTR-20

Prior to running WinTR-20, it is useful to view
the watershed Schematic.
Under the View drop down menu on the
Controller/ Editor screen, click on Schematic.

38
Checking Data Prior to Running WinTR20

The Schematic shows how the sub-areas and reaches
are configured.
Make sure that Legend and Labels under the
View options are turned on.

39
Running WinTR-20

After the file has been saved, the Run option
will show in menu bar at the top.
To run the program, simply click on the Run
button.

40
WinTR-20 Output- Printed Page File

Following a successful run, the Printed Page
File screen comes up.
For this example, peak discharge and hydrographs
were requested for all sub-areas and stream
reaches.
Output can be sent to the printer or to a file
from this screen.

41
WinTR-20 Output- Printed Page File

To simplify the output, the hydrograph option
is removed from each sub-area and reach and the
model is then re-run.
The screen to the right shows the simplified
output from this second run.

42
WinTR-20 Output - Plots

WinTR-20 also has graphical output capabilities.
Following a successful run, the Plots option
can be selected ...

43
WinTR-20 Output - Plots

In this example, the Hydrograph for Area 2
100-year is requested.
Note Hydrograph plots are only available if
Hydrograph Output has been selected within the
individual sub-area/stream reach or as a Global
Output.

44
WinTR-20 Output - Plots

The graphic shown to the right comes up after
Display is clicked.
Options include printing, copying, and zooming in
and out.

45
WinTR-20 Output - Plots (continued)

To plot two items on the same graph, select an
option (Multiple Storms, Alternate or Location)
under Multiple Hydrographs
For this example (multiple location), a plot of
the hydrograph into and out of the storage
structure (Reach 1) for the 100-year event is
selected.

46
WinTR-20 Output - Plots (continued)

The resulting multiple plot is shown below

47
Global Output

Instead of requesting individual output options
within each sub-area and stream reach, the user
can use the Global Output from the main menu.

48
Global Output (continued)

Global Output allows the user to select the same
output for ALL sub-areas and stream reaches at
once.
For this example, hydrographs and peak discharge
information will be output for all points in the
watershed.

49
Some Important Considerations

Each time a change is made to the input data, the
file must be saved before the Run option is
presented.
When bringing in an existing file, select No
Changes (Close) to get the Run option to
appear.
All data input require a positive entry (i.e.
carriage return, tab, or mouse click) to be
recognized.

50
WinTR20 Support Team
51
WinTR20 Web Site

For downloading the latest version of WinTR-20,
click on hydrology/hydraulics at the following
website
http//www.wcc.nrcs.usda.gov/
This web page also has information on
Update notes
WinTR-20 Manual Download
email address for the WinTR20 Support Team

52
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53
Converting Old TR-20 Input Files to New WinTR-20
Format
54
WinTR-20 Data Converter
55
WinTR-20 Data Converter

The data converter subprogram is within the new
WinTR-20 editor.
Convert most items in the old TR-20 input data
set (Version dated 1983 and later).
The data can be run in the present WinTR-20
format.

56
WinTR-20 Data Converter

Some features in the old TR-20 program are not
used in the New WinTR-20 and will not translate.
These features will be ignored during the
conversion
- Runoff Option in Rainfall Distribution Table
- IPEAKS (intermediate peak output)
- Multiple time increments (new WinTR-20 will
take care of this automatically).

57
Output Option Considerations

The output options used in the Old TR-20 input
files do not translate over the new version.
The user will have to re-establish the output
parameters in the new data file
- Global Output
- Sub-Area or Reach record

58
Reach Routing Considerations

Reach routing has been revised in the new
program, the user will have to input additional
data.
The routine in the new WinTR-20 (Muskingum-Cunge)
requires
- Elevation
- Discharge
- End Area
- Top Width
- Friction Slope
tables for ALL reach routing

59
WinTR-20 Converter Reach Routing Considerations

There is no provision for parametric routing
(i.e. the X and m option with the old TR-20
ATT-KIN method) in the new version.
Any reach section using X and m in the Old
data will have to have a complete reach routing
table developed (Elevation, Discharge, End Area,
Top Width, and Friction Slope).

60
Reach Routing Considerations

If Old TR-20 data set had XSECTN tables
- Converter program will calculate a top
top width from the old TR-20 XSECTN
table data.
- User only have to add the friction slope to
the rating table.

61
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62
WinTR-20 ConverterExample

Double click on WinTR-20 icon.
WinTR-20 System Controller / Editor Window will
pop up.
Click on Convert old Data from the File pull
down menu.

63
WinTR-20 ConverterExample
64
WinTR-20 ConverterExample

After Old TR-20 data file selected and converted
WinTR-20 Identifier window will appears.
You may make the change to
- Min. Hydrograph Values
- Watershed Description
Click button to close this
window.

65
WinTR-20 ConverterExample

WinTR-20 System Controller / Editor Window will
appears.
Select Stream Cross Section to add the missing
Friction Slope.

66
WinTR-20 ConverterExample

Select Stream Cross Section from pull down
menu.
Cross Section data will appears.
Top Width values calculated automatically
from old TR-20 data.

67
WinTR-20 ConverterExample (continued)

To enter the missing Friction Slope
- Click on the line from the table
- Data will be appears
- Enter Friction Slope
Click on Display Data button to view Cross
Section plot.
Click on button to close this
window.

68
WinTR-20 ConverterProgram

Prompt you back to the Main Window.
Peak Output and Hydrograph Output for Sub-Area
and Reach click on Global Output.
Global Output Window will appears.

69
WinTR-20 Converter

Enter Hydrograph Print Precision
Enter Minimum Hydrograph Display Flow
Enter Print Time Increment
For Peak Output and Hydrograph Output for
Sub-Area and Reach check Yes
Click on button to close this
window.

70
WinTR-20 Converter

Save new WinTR-20 data select SaveAs from the
File drop down menu.
Give a new file name with .inp extension.
Click Save to continue.

71
WinTR-20 Converter

To view the schematic - select Schematic from
the View drop down menu.
If the schematic looks OKAY! exist the
schematic window.

72
WinTR-20 Converter

To view the Input File - select Input File from
the View drop down menu.
Click Close button to exist this window.

73
WinTR-20 ConverterExample

To perform the calculation select Run from
the main menu.
After a successful run the WinTR-20 Printed
Page File will appears.
You are Done!

74
Program to Convert HEC-RAS Output to WinTR-20
Cross Section
75
Program to convert HEC-RAS output into WinTR-20
Cross Section

Program is incorporated into Windows interface
Reads HEC-RAS text file created by the user thru
HEC-RAS program
After creating HEC-RAS output text file, open
WinTR-20 Windows interface and click File then
Import HEC-RAS
Rating table program comes as a part of the
Window WinTR-20 system.

76
Modify Profile Output Table

Bring up a project from HEC-RAS
Select Profile Summary Table from View menu .

77
Modify Profile Output Table

Profile Output Table-Standard Table 1 will
appears.
Select Define Table from Options pull down
menu.

78
Modify Profile Output Table

Create a Table Heading window will appears.
Click on Clear All Table Headings
Double click to select Min. Ch El, LOB Elev,
ROB Elev, W.S.Elev, Q Total, Flow Area, Top
Width, and Frcnt Slope.

79
Modify Profile Output Table

After all seven columns have been selected.
Click on Additional Options tab.
Since only Valley Cross Sections are desired
the only box that should be checked is Cross
Sections
Click OK to exist.

80
Modify Profile Output Table

Note the order of the columns Min Ch El, LOB
Elev, ROB Elev, W.S.Elev, Q Total, Top Width, and
Frctn Slope.
Save Profile Output Table by select Save Table
from the Options pull down menu.

81
Modify Profile Output Table