USDANRCS Win TR20 Hydrology Model Basic Tutorial This

USDA-NRCS Win. TR-20 Hydrology Model Basic Tutorial

● This tutorial demonstrates the new Win. TR 20 model. Using a simple example, you will learn how to: l l l Create an Input File Run Win. TR-20 View Output Win. TR-20 Hydrology Model Basic Tutorial

Example Problem Ø 3 Sub-areas - Sub-area 1 contains a floodwater retarding structure. Ø 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. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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 Win. TR 20 modeled watersheds end with the final stream reach terminating at an “Outlet”. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Sub-area / Reach Concepts ● Win. TR 20 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. Win. TR-20 Hydrology Model Basic Tutorial

Schematic For Example Problem Sub-area 2 Reach 2 Outlet Sub-area 1 (Storage Routing) Reach 1 (Reach Routing) Sub-area 3 Legend Storage Structure Sub-Area Inflow Points Win. TR-20 Hydrology Model Basic Tutorial

Data Sources ● The data presented in the next 5 slides have been gathered prior to inputting into Win. TR 20. ● The data include: l l Sub-area Watershed Characteristics Stream Reach Hydraulics Storage Structure Hydraulics Evaluation Storm Amounts and Distribution Win. TR-20 Hydrology Model Basic Tutorial

Sub-area Parameters Drainage Area (sq. mi. ) Runoff Curve Number Sub-area 1 2 3 1. 88 0. 51 1. 54 70 74 70 Time of Concentration (hr) 1. 23 0. 72 1. 59 Receiving Reach Number 1 2 Outlet Win. TR-20 Hydrology Model Basic Tutorial

Reach Parameters Reach Parameter Reach 1 Reach 2 Receiving Reach 2 Outlet Reach Type Structure Channel Reach Length NA 5400 feet Win. TR-20 Hydrology Model Basic Tutorial

Reach 1 Structure Data Ø Example problem assumes pool is empty (EL 2423. 0) when storm begins. Win. TR-20 Hydrology Model Basic Tutorial

Reach 2 Rating Table Data derived from HECRAS, Manning’s, etc. Ø Reach Length = 5400 feet, Bankfull Elevation = 2422. 5 Ø Win. TR-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 Win. TR 20) Win. TR-20 Hydrology Model Basic Tutorial

Getting Started - The Initial Win. TR-20 Editor Screen ● Using Windows Explorer, go to the “Win. TR-20 Executables” directory and click on ● The following Win. TR-20 System Controller/ Editor Screen comes up: Win. TR-20 Hydrology Model Basic Tutorial

Win. TR 20 Controller / Editor Screen ● Click on the “File” menu ● From the drop down menu, select “New Win. TR-20 File” Win. TR-20 Hydrology Model Basic Tutorial

Win. TR 20 Identifier Record The next screen to appear is the Win. TR-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. ● Win. TR-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: l Sub-area l Stream reach l Structure rating l Stream Cross Section l Storm Analysis ● Start this example by clicking on “Sub-Area: ” ● Win. TR-20 Hydrology Model Basic Tutorial

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-Area’s hydrograph. ● Win. TR-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 Win. TR-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 2’s data. Repeat for “Area 3”. Click “Accept Changes (Close)” button when finished. Win. TR-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. ● Win. TR-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. Win. TR-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”). Win. TR-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. Win. TR-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. Win. TR-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. ● Win. TR-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 Win. TR 20 start the routing at the lowest elevation in the rating table. ● Click on “Accept Changes (Close)” button when finished. ● Win. TR-20 Hydrology Model Basic Tutorial

Entering Structure Data ● The user can click on “Display Data” for a graphical view of the data just input. Win. TR-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. Win. TR-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. ● Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

Entering Stream Cross Section Data Ø Notes on Cross Section Data: 4 4 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) Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

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 alphanumeric string. ● The screen to the right shows the user selecting the Type II Rainfall Distribution from the pulldown menu. ● Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

Entering Storm Data (continued) Ø Storm Analysis Input Notes 4 4 “Rain Gage Identifier” is not required if TR 20 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. Win. TR-20 Hydrology Model Basic Tutorial

Saving Input File ● After accepting the Storm Analysis data, the user is returned to the Win. TR 20 Input Editor Main Menu. ● From the “File” menu, select “Save As” to give a file name and saving location. Win. TR-20 Hydrology Model Basic Tutorial

Checking Data Prior to Running Win. TR-20 Prior to running Win. TR-20, it is useful to view the watershed “Schematic”. ● Under the “View” drop down menu on the Controller/ Editor screen, click on “Schematic”. ● Win. TR-20 Hydrology Model Basic Tutorial

Checking Data Prior to Running Win. TR 20 The Schematic shows how the subareas and reaches are configured. ● Make sure that “Legend” and “Labels” under the “View” options are turned on. ● Win. TR-20 Hydrology Model Basic Tutorial

Running Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

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

Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Output - Plots ● The graphic shown to the right comes up after “Display” is clicked. ● Options include printing, copying, and zooming in and out. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Output - Plots (continued) Ø The resulting multiple plot is shown below: Win. TR-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. Win. TR-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. Win. TR-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. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR 20 Support Team Kenneth Aycock Geoffrey Cerrelli John Chua Pete Cooper Auburn, AL Philadelphia, PA Phoenix, AZ St. Paul, MN 334 -887 -4525 717 -237 -2214 602 -280 -8838 651 -602 -7884 William Merkel Helen Fox Moody Dan Moore Beltsville, MD Portland, OR 301 -504 -3956 301 -504 -3948 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 Win. TR-20 Hydrology Model Basic Tutorial

Win. TR 20 Web Site Ø For downloading the latest version of Win. TR- 20, click on “hydrology/hydraulics” at the following website: http: //www. wcc. nrcs. usda. gov/ Ø This web page also has information on: l l l Update notes Win. TR-20 Manual Download email address for the Win. TR 20 Support Team Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Hydrology Model Basic Tutorial

Converting Old TR-20 Input Files to New Win. TR-20 Format Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Data Converter ● The data convert subprogram within the new Win. TR-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 Win. TR-20 System Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Data Converter The data converter subprogram is within the new Win. TR-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 Win. TR 20 format. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Data Converter Some features in the old TR-20 program are not used in the New Win. TR-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 Win. TR-20 will take care of this automatically). ● Win. TR-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 Win. TR-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. Ø The routine in the new Win. TR-20 (Muskingum-Cunge) requires: - Elevation - Discharge - End Area - Top Width - Friction Slope Ø tables for ALL reach routing Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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). ■ Win. TR-20 Hydrology Model Basic Tutorial

Reach Routing Considerations ● If Old TR-20 data set had “XSECTN” tables: - Converter program will calculate a top width from the old TR-20 “XSECTN” table data. - User only have to add the friction slope to the rating table. Win. TR-20 Hydrology Model Basic Tutorial

Example Converting Old TR-20 Data File to New Win. TR-20 Format Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter Example ● Double click on Win. TR-20 icon. ● Win. TR-20 System Controller / Editor Window will pop up. ● Click on “Convert old Data” from the “File” pull down menu. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter Example • Select Old TR-20 data file to convert (Example: A 1. dat) Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter Example ● After Old TR-20 data file selected and converted – Win. TR-20 Identifier window will appears. ● You may make the change to: - Min. Hydrograph Values: - Watershed Description: ● Click button to close this window. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter Example Win. TR-20 System Controller / Editor Window will appears. ● Select “Stream Cross Section: ” to add the missing “Friction Slope”. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-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. Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter Save new Win. TR 20 data – select “Save. As” from the “File” drop down menu. ● Give a new file name with “. inp” extension. ● Click “Save” to continue. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter To view the schematic - select “Schematic” from the “View” drop down menu. ● If the schematic looks OKAY! – exist the schematic window. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter To view the Input File - select “Input File” from the “View” drop down menu. ● Click “Close” button to exist this window. ● Win. TR-20 Hydrology Model Basic Tutorial

Win. TR-20 Converter Example To perform the calculation – select “Run” from the main menu. ● After a successful run – the Win. TR-20 Printed Page File will appears. ● You are Done! ● Win. TR-20 Hydrology Model Basic Tutorial

Program to Convert HEC-RAS Output to Win. TR-20 Cross Section Win. TR-20 Hydrology Model Basic Tutorial

Program to convert HEC-RAS output into Win. TR-20 Cross Section Ø Program is incorporated into Windows interface; Ø Reads HEC-RAS text file created by the user thru HEC-RAS program; Ø After creating HEC-RAS output text file, open Win. TR-20 Windows interface and click “File” then “Import HEC-RAS”; Ø Rating table program comes as a part of the Window Win. TR-20 system. Win. TR-20 Hydrology Model Basic Tutorial

Modify Profile Output Table Bring up a project from HEC-RAS Ø Select “Profile Summary Table” from “View” menu. Ø Win. TR-20 Hydrology Model Basic Tutorial

Modify Profile Output Table-Standard Table 1 will appears. Ø Select “Define Table…” from “Options” pull down menu. Ø Win. TR-20 Hydrology Model Basic Tutorial

Modify Profile Output Table Create a Table Heading window will appears. Ø Click on “Clear All Table Headings” Ø Double click to select – Min. Ch El, LOB Elev, ROB Elev, W. S. Elev, Q Total, Flow Area, Top Width, and Frcnt Slope. Win. TR-20 Hydrology Model Basic Tutorial Ø

Modify Profile Output Table After all seven columns have been selected. Ø Click on “Additional Options” tab. Ø Since only “Valley Cross Sections” are desired – the only box that should be checked is “Cross Sections” Ø Click “OK” to exist. Win. TR-20 Hydrology Model Basic Tutorial Ø

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. Ø Save Profile Output Table by select “Save Table…” from the “Options” pull down menu. Ø Win. TR-20 Hydrology Model Basic Tutorial

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

Modify Profile Output Table-Modify must be saved as text file (Modify. txt). Ø Select “Write to Text File…” from “File” menu. Ø Win. TR-20 Hydrology Model Basic Tutorial

Modify Profile Output Table Select an appropriate name for the text file (Modify. txt) Ø Select a directory Ø Click “Save. Win. TR-20 ” Hydrology Model Basic Tutorial Ø

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

Import HEC-RAS into New Win. TR-20 Select “Import HEC-RAS” from “File” pull down menu Ø Locate the directory, select text file name (Modify. txt) Ø Win. TR-20 Hydrology Model Basic Tutorial

Import HEC-RAS into New Win. TR-20 Ø Win. TR-20 Identifier window will pop up Ø Edit / Enter - Min. Hydrograph Value - Watershed Description Ø Click “Accept Changes (Close)” to close this window Win. TR-20 Hydrology Model Basic Tutorial

Import HEC-RAS into New Win. TR-20 Ø Bring you back to the Win. TR-20 System Controller / Editor window Ø Click on “Stream Cross Section: ” Note: (X indicates some Model data. Basic entered Win. TR-20 Hydrology Tutorialfor section)

Import HEC-RAS into New Win. TR-20 Ø “Stream Cross Section” window will appears. Ø Select “Cross Section” from pull down menu. Win. TR-20 Hydrology Model Basic Tutorial

Import HEC-RAS into New Win. TR-20 Ø Click on “Display Data “ button for graphical view of the Stream Cross Section Display Data. Ø Click on “No Changes (Close)’ button to close this window. Win. TR-20 Hydrology Model Basic Tutorial

Import HEC-RAS into New Win. TR-20 Ø From “File” menu, select “Save As” – give a file name and location. Ø “Run” button is now available. Win. TR-20 Hydrology Model Basic Tutorial

Import HEC-RAS into New Win. TR-20 Ø Try to “Run” Win. TR-20 Ø Generated Win. TR-20 Error File - No Stream Reach data No Sub-Area data. No Storm Analysis data. Win. TR-20 Hydrology Model Basic Tutorial

The End. Win. TR-20 Hydrology Model Basic Tutorial