Uncertainty analysis of HEC-HMS model using the GLUE method for flash flood. CEE Engineering Hydrology HEC-HMS Bare Essentials Tutorial and Example comprehensive or to replace the HEC-HMS documentation; rather it is a. The Hydrologic Modeling System (HEC-HMS) is designed to simulate the complete hydrologic processes of dendritic watershed systems.
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This function computes the flow accumulation grid that contains the accumulated number of cells upstream of a cell, for each cell in the input grid. Similar to previous tables, the data are organized as the feature identifier XS2DIDits relative station number tjtorial the corresponding n value as shown below: A point is then created at the location of mouse click, and the following form is displayed:.
The preparation of soil data is done at this point.
It allows displaying the profile of selected river reach es. Confirm the input Subbasin and River files, and click OK.
With the attribute table open, right click on SoilCode field to open the field calculator and then equate SoilCode to component. Input to the batch subwatershed delineation function is a point feature class with point locations of interest. We are almost done with GeoRAS pre-processing. You can treat these methods as tentative which can be changed in HMS model.
By doing the DEM hef you can increase the degree of agreement between stream networks delineated from the DEM and the input vector stream networks. You must have the same coordinate system for all the data and data frames used for this tutorial or any GeoRAS project.
The next step is to enter flow data. It is then cumbersome to find out which feature classes were used during pre-processing, and which feature classes contain results for visualization. These parameters include SCS curve number, time of concentration, channel routing coefficients, etc.
Meteorologic Model We do not have any meteorologic data temperaturerainfall etc at this point. In the layer setup for post-processing, first select the New Analysis option, and name the new analysis as Steady Flow. Center of Gravity Method computes the centroid as the center of gravity of the sub basin if it is located within the sub basin.
Drainage Line Polygons file name: Sometimes you will realize at the end! Again make sure you snap the starting point with the common end points of Upper Baxter Reach and Tule Tributary. Using the Sketch tool highlighted abovestart digitizing the river centerline from upstream to downstream until you reach the intersection with Tule Creek tributary. Batch Watershed Delineation This function delineates the watershed upstream of each point in an input Batch Point feature class.
Preparing Soil data for CN Grid 2. Similar to previous tables, the data are organized as the feature identifier XS2DIDits relative station number and the corresponding n value as shown below:. Label all flow paths, and confirm this by opening the attribute table of the Flowpaths feature class. This process takes a while actually quite a while! Flow Accumulation Grid file name: Due to some unknown reasons, if you get an error message at this point saying field cannot be added to a layer, save the map document, exit ArcMap and open the document, and try again.
Towards the end of the section 6. Preparing Soil data for CN Grid. This tool will assign station number distance from each cross-section to the downstream end of the river to each cross-section cutline.
If not, you will find the links to the data also below. Enter 3 for number of profiles, and click Apply Data.
Step by Step: Flood Hazard Mapping
This concludes the terrain processing part. You can check the Slp field in the input River1 or whatever name you have for your input river feature class is populated. Therefore, check the data carefully, and if you think everything is OK, ignore the errors if you get any for connectivity and proceed.
However, if you want to distinguish your points for whatever reason from the default BatchPoint, it is better to just keep them in separate feature class. Since we do not have Storage areas, click Finished-Import Data. Click on the Point Delineation icon in the ArcHydro toolbar to activate the tool.
For example, when you click on a Reach Ryou will see that Muskingum routing method is associated with it.
HEC-HMS Exercise for CEK at University of Texas at Austin
Upon successful completion of the process, the Fil layer is added to the map. Add cngrid curve number grid from Layers folder to the map document. Click on the Tracing icon in the ArcHydro toolbar to activate the tool. Watershed Processing Arc Hydro toolbar also provides an extensive set of tools for delineating watersheds and subwatersheds. This function captures the geographic information x,y of the subbasin boundaries and stream alignments in a text file that can be read and displayed within HMS.
Map to HMS Units. This will help identify any errors in the input data and fix them, and run the simulation again, if necessary. The spatial features in conjunction with the look-up table can then be used to create curve number grid.
Also you need to make sure the name and description match with each other. We can treat the main stem of the Baxter River as one river and the Tributary as the second river. We can add blocked obstructions to our study by using building locations in the aerial tuyorial. You can write some metadata if you wish,and finally choose the outside MainView Geodatabase for Project Data Location, and browse to your working directory where cedar. The Basin Slope tool computes average slope for sub-basins using the slope grid and sub-basin polygons.
Confirm the layers in the next window, and click OK. After the computations are complete, you can open the attribute table for subbasin, and see that a field named BasinCN is populated with average curve number for each sub-basin.
This will tell ArcHydro that the watersheds for these points are not delineated and the program can snap these points to drainage line before delineating watershed.