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Hec ras tutorial7/13/2023 ![]() ![]() Once you’ve drawn your 2D area boundary and have assigned a mesh cell center spacing (DX and DY) and Manning’s roughness value(s), really all that is left is toĪssign boundary conditions at the upstream and downstream ends using 2D Area BC Lines. The following figure presents the geometry file for Muncie when modeled with a single 2D area. To keep things simple, the levee breach was removed and flow moving into the overbank areas is purely due to overtopping of the levee. ![]() In this example, the standard Muncie project offered by the Hydrologic Engineering Center has been converted first to SI units, then to a single 2D mesh. There have been many questions lately about whether HEC-RAS 5.0 can perform a simulation with ONLY a 2D mesh (i.e. Written by Chris Goodell | January 12, 2015
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