Import terrain and watershed boundary data from previous steps (HUC-10 level shapefile used in this example) to your project with Add data menu.ĭo NOT use an unprojected CRS, such as Geographic. It is helpful to save the map in the same folder as the rest of the project data. Start a new project or open an existing project in ArcMap.This example uses ArcMap to merge, clip, and project the DEM file. The watershed used in this example is the 122 square mile East Branch Brandywine Creek watershed in Pennsylvania. We will use the watershed boundary to clip the extent of the terrain raster for smaller file sizes and faster processing. We will use it as an input to HEC-HMS to create a terrain dataset, which can then be loaded into a Basin Model for hydrologic analysis (see Creating and Linking Terrain Data into a Basin Model tutorial). A DEM is a representation of the bare ground topography (elevations) excluding trees, buildings, and any other surface objects. Refer to Downloading and Preparing Terrain Data for HEC-HMS Using QGIS for guidance. Other GIS applications such as QGIS can be used instead of ArcMap. In this tutorial you will use ArcMap to prepare terrain data in the form of Digital Elevation Model (DEM) raster from open-source elevation and watershed boundary data (see the tutorial on Downloading Elevation and Watershed Boundary Data ).
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