NRCS TR20 - Hydrology Model

NRCS TR20 - Hydrology Model

USDA-NRCS WinTR-20 Hydrology Model Basic Tutorial 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 WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial

Schematic For Example Problem Reach 2 Sub-area 2 Outlet Sub-area 1 (Storage Routing) Reach 1 (Reach Routing) Sub-area 3 Legend

Storage Structure Sub-Area Inflow Points WinTR-20 Hydrology Model Basic Tutorial 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 WinTR-20 Hydrology Model Basic Tutorial Sub-area Parameters Sub-area Parameters Sub-area Sub-area Sub-area 1 2 3 Drainage Area (sq.mi.)

1.88 0.51 1.54 Runoff Curve Number 70 74 70 Time of Concentration (hr) 1.23

0.72 1.59 Receiving Reach Number 1 2 Outlet WinTR-20 Hydrology Model Basic Tutorial Reach Parameters Reach Parameter Reach 1

Reach 2 Receiving Reach Reach 2 Outlet Reach Type Structure Channel Reach Length NA

5400 feet WinTR-20 Hydrology Model Basic Tutorial Reach 1 Structure Data Example problem assumes pool is empty (EL 2423.0) when storm begins. Elevation 2423.0 2438.0 2440.0 2450.0 2457.5 2458.0

2459.0 2461.5 2463.0 Discharge (cfs) 0 50 57 83 98 155 370 1350 2100 Storage (Acre Feet)

0.0 52.3 76.6 375.7 600.0 631.0 700.0 915.0 1070.0 WinTR-20 Hydrology Model Basic Tutorial Reach 2 Rating Table Data derived from HECRAS, Mannings, etc. Reach Length = 5400 feet, Bankfull Elevation = 2422.5 Elevation

2410.0 2411.4 2412.3 2413.4 2415.1 2416.9 2418.2 2419.3 2420.1 2420.9 2421.5 2422.1 2423.1 2423.9 2424.4 2425.0 Discharge

(cfs) 0 25 50 100 250 500 750 1000 1250 1500 1750 2000 2500 3000 3500 4000

End Area (ft2) 0 19 41 81 170 296 404 502 592 677 755 843 1112 1751 2739 3844

Top Width (ft) 0 23 31 42 60 78 90 100 109 116 123 193 369 1440 1935

1994 Friction Slope (ft/ft) 0.0050 0.0038 0.0018 0.0011 0.0008 0.0007 0.0007 0.0008 0.0008 0.0008 0.0009 0.0009 0.0010 0.0010

0.0008 0.0007 WinTR-20 Hydrology Model Basic Tutorial 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)

WinTR-20 Hydrology Model Basic Tutorial 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:

WinTR-20 Hydrology Model Basic Tutorial WinTR20 Controller / Editor Screen Click on the File menu From the drop down menu, select New WinTR-20 File WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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: WinTR-20 Hydrology Model Basic Tutorial Entering Sub-Area Data Enter data as shown for all three SubAreas. Sub-Area and SubArea Reach Identifier are user defined alpha-numeric names. Sub-Area Reach

Identifier refers to the Reach that will receive the Sub-Areas hydrograph. WinTR-20 Hydrology Model Basic Tutorial 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 WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial Entering Stream Reach Data After all the subarea 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. WinTR-20 Hydrology Model Basic Tutorial 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). WinTR-20 Hydrology Model Basic Tutorial Stream Reach 1 Data Reach 2 is the receiving reach for Reach 1. Reach 1 is a structuretype 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. WinTR-20 Hydrology Model Basic Tutorial Stream Reach 2 Data Outlet (end of the watershed) is the receiving reach for Reach 2.

Reach 2 is a channeltype 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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.

WinTR-20 Hydrology Model Basic Tutorial Entering Structure Data The user can click on Display Data for a graphical view of the data just input. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial Entering Stream Cross Section

Data The user can click on Display Data for a graphical view of the data just input. WinTR-20 Hydrology Model Basic Tutorial 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) WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial Entering Storm Data Enter the 5- and 100year rainfall amounts, distribution type, and Antecedent Runoff Condition (ARC - Default

is 2). The Storm Identifier can be any alphanumeric string. The screen to the right shows the user selecting the Type II Rainfall Distribution from the pulldown menu. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial Checking Data Prior to Running WinTR20 The Schematic shows how the subareas and reaches are configured. Make sure that Legend and

Labels under the View options are turned on. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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 subareas and stream reaches. Output can be sent to the printer or to a file from this

screen. WinTR-20 Hydrology Model Basic Tutorial 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 rerun. The screen to the right shows the simplified output from this second

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

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.

WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial

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.

WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Output - Plots (continued) The resulting multiple plot is shown below: WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial WinTR20 Support Team Kenneth Aycock Geoffrey Cerrelli Auburn, AL Philadelphia, PA 334-887-4525 717-237-2214 John Chua Pete Cooper

Phoenix, AZ St. Paul, MN 602-280-8838 651-602-7884 William Merkel Helen Fox Moody Beltsville, MD Beltsville, MD 301-504-3956 301-504-3948 Dan Moore

Portland, OR 503-414-3054 Tom Perkins Portland, OR 503-414-3059 Quan D. Quan Beltsville, MD 301-504-3952 Jon Werner

Washington, DC 202-702-0772 WinTR-20 Hydrology Model Basic Tutorial 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 WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Hydrology Model Basic Tutorial Converting Old TR-20 Input Files to New WinTR-20 Format WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Data Converter

The data convert subprogram within the new WinTR-20 edits and converts most items in the old TR-20 input data sets (Version dated 1983 and later) so that they can be run in the present WinTR-20 System WinTR-20 Hydrology Model Basic Tutorial 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 WinTR20 format. WinTR-20 Hydrology Model Basic Tutorial

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). WinTR-20 Hydrology Model Basic Tutorial 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 WinTR-20 Hydrology Model Basic Tutorial 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 WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Reach Routing Considerations There is no provision for parametric routing (i.e. the X and m option with the old TR20 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). WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial

Example Converting Old TR-20 Data File to New WinTR-20 Format WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Example 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. WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Example Select Old TR-20 data file to convert (Example: A1.dat) WinTR-20 Hydrology Model Basic Tutorial

WinTR-20 Converter Example 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. WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Example WinTR-20 System Controller / Editor Window will appears. Select Stream Cross Section: to add the missing

Friction Slope. WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Example Select Stream Cross Section from pull down menu. Cross Section data will appears. Top Width values calculated

automatically from old TR-20 data. WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Example (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. WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Program 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial

WinTR-20 Converter Save new WinTR20 data select SaveAs from the File drop down menu. Give a new file name with .inp extension. Click Save to continue. WinTR-20 Hydrology Model Basic Tutorial

WinTR-20 Converter To view the schematic - select Schematic from the View drop down menu. If the schematic looks OKAY! exist the schematic window. WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter

To view the Input File - select Input File from the View drop down menu. Click Close button to exist this window. WinTR-20 Hydrology Model Basic Tutorial WinTR-20 Converter Example

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! WinTR-20 Hydrology Model Basic Tutorial Program to Convert HEC-RAS Output to

WinTR-20 Cross Section WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial

Modify Profile Output Table Bring up a project from HEC-RAS Select Profile Summary Table from View menu . WinTR-20 Hydrology Model Basic Tutorial Modify Profile Output Table Profile Output Table-Standard Table 1 will appears. Select Define Table from Options pull down menu.

WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial 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. WinTR-20 Hydrology Model Basic Tutorial Modify Profile Output Table Enter name of new Table (Modify). Click OK. The Profile Output Table-Modify is available under User Tables menu as well as other. WinTR-20 Hydrology Model Basic Tutorial Modify Profile Output Table

Profile Output Table-Modify must be saved as text file (Modify.txt). Select Write to Text File from File menu. WinTR-20 Hydrology Model Basic Tutorial Modify Profile Output Table Select an appropriate name for the text file (Modify.txt) Select a directory Click Save WinTR-20 Hydrology Model Basic Tutorial

Import HEC-RAS into New WinTR-20 Using Windows Explorer, go to the WinTR20 Executables directory and click on The following WinTR20 System Controller/ Editor Screen comes up: WinTR-20 Hydrology Model Basic Tutorial Import HEC-RAS into New WinTR-20

Select Import HEC-RAS from File pull down menu Locate the directory, select text file name (Modify.txt) WinTR-20 Hydrology Model Basic Tutorial Import HEC-RAS into New WinTR-20 WinTR-20 Identifier window will pop up

Edit / Enter - Min. Hydrograph Value - Watershed Description Click Accept Changes (Close) to close this window WinTR-20 Hydrology Model Basic Tutorial Import HEC-RAS into New WinTR-20 Bring you back to the WinTR-20

System Controller / Editor window Click on Stream Cross Section: Note: (X indicates some dataTutorial entered for WinTR-20 Hydrology Model Basic Import HEC-RAS into New WinTR-20

Stream Cross Section window will appears. Select Cross Section from pull down menu. WinTR-20 Hydrology Model Basic Tutorial Import HEC-RAS into New WinTR-20 Click on Display

Data button for graphical view of the Stream Cross Section Display Data. Click on No Changes (Close) button to close this window. WinTR-20 Hydrology Model Basic Tutorial Import HEC-RAS into New WinTR-20 From File menu, select Save As

give a file name and location. Run button is now available. WinTR-20 Hydrology Model Basic Tutorial Import HEC-RAS into New WinTR-20 Try to Run WinTR-20 Generated WinTR-20

Error File - No Stream Reach data No Sub-Area data. No Storm Analysis data. WinTR-20 Hydrology Model Basic Tutorial The End. WinTR-20 Hydrology Model Basic Tutorial

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