Saturday, January 10, 2015

Create Watershed Data Using the InfoSWMM Subcatchment Manager

Subject:  Create Watershed Data Using  the InfoSWMM Subcatchment Manager

The Subcatchment Manager of InfoSWMM will  help calculate most of the  physical parameters associated with a Watershed or Subcatchment in SWMM 5 from a Digital Elevation Data (Step 1).  The Subcatchments slope is estimated from a slope raster (Step 2) and the Slope Calculator (Step 4). The created watershed area are calculated using the command Update DB from Map (Step 6) along with the Subcatchment Width (Step 3) and the Impervious Area (Step 5).   The physical parameters estimated from the DEM are shown in Figure 1.
Step 1.  Use the command Create Flow Stream to create a Flow Stream for the DTM or DEM that can be used later.
Step 2.   Create a Slope Raster from the DEM for later usage in the Slope Calculator.
Step 6.   Use Arc Map to calculate the area of the Subcatchments using the command Update DB from Map and the following Operation Flags.

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