Geospatial Hydrologic Modeling Extension HEC-GeoHMS, User’s Manual. Public Domain That information is also provided in Appendix E of this manual for. This tutorial is designed to expose you to basic functions in HEC-GeoHMS ( ArcGIS version) to create input files for hydrologic modeling with HEC-HMS. Step 7: Terrain processing and HEC-GeoHMS model development The DEM, land use and soil data used in this tutorial are already clipped.
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Zoom-in to the area marked in the rectangle below: Save your edits, stop the Editor, and save the map document.
For this exercise we will take the easy route, but you may want to populate these features for other studies depending on your project needs. The Muskingum method is added to RouteMet field in the River feature class.
HEC-GeoRAS Export Error | GeoNet
You can specify the methods that HMS should use for transform rainfall to runoff and routing channel routing using this function. Subwatersheds delineated from a set of points are therefore by definition non overlapping because the watershed draining to a point that is within another watershed is excluded from the subwatershed of the downstream point. You will get a message indicating that 1 point has been processed. Flow Direction Grid This function computes the flow direction for a given grid.
In the next window, provide the following inputs: Preparing land use data for CN Grid. Catchment Polygons file name: Tutroial can add blocked obstructions to our study by using building locations in the aerial photograph. Give some name for the Run, and leave the default information for time and time interval unchanged. Close the attribute table, and save the map document. Select Characteristics Basin Centroid.
If you want to associate the watershed geohme with attributes from your point features, you will need to use join and relates or other ways of linking these attributes to watershedpoints. Printer-friendly version Log in to post comments.
Step by Step: Flood Hazard Mapping
A new feature class storing longest flow path for each sub-basin is created as shown below:. Click OK on the process completion message box. Save your edits and stop editing. 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.
The ArcCatalog-view of the data folder is shown below: After successful simulation, close the computation window and the steady flow window. Confirm the input River name, and click OK. For each catchment that is not a head catchment, a polygon representing the whole upstream area draining to its inlet point is constructed and stored in a feature class that has an Adjoint Catchment tag. The vector data will be stored in a feature dataset also named Layers within the geodatabase associated with the map document.
The flowpath layer contains three types of lines: You can also play with the contributing area tool to find out contributing area at different points in the cedar creek stream network.
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. All the cells in a particular segment have the same grid code that is specific to that segment. In this context a watershed, such as was delineated gutorial is the entire tutorual upstream of a point, while a subwatershed is the area that drains directly to a point of interest excluding any area that is part of another subwatershed.
This will create a bounding polygon, which basically defines the analysis extent for inundation mapping, by connecting the endpoints of XS Cut Lines. The output is the Catchment polygon feature class, having the default name Catchment that can be overwritten.
Step by Step: Flood Hazard Mapping | UN-SPIDER Knowledge Portal
You can change the symbology of the grid to make it look pretty! Flood Hazard Mapping Overview. With the attribute table open, teohms click on SoilCode field to open the field calculator and then equate SoilCode to component. You will see the reach will get selected, invoking the following window:.
Zoom-in to the area marked tuttorial the rectangle below:. A point feature class showing centroid for each sub-basin is added to the map document.
This will create ProjectPoint and ProjectArea feature classes. Confirm that the inputs are as below. HMS Project This function copies all the project specific files that you have created.