Selecting Programs to Run

There are three components used in performing an unsteady flow analysis within HEC-RAS. These components are: a geometric data pre-processor; the unsteady flow simulator; and an output post-processor. Additionally, there is an option to automate the process of computing a Static flood inundation map (Depth Grid), or other static map layers (i.e. Arrival time grids, flood duration grids, etc…) after the unsteady flow simulation has finished. Computing static (Grids to disk) inundation maps is accomplished by checking the Floodplain Mapping option under the Programs to Run area. However, this option will only work if you have previously set up the computation of Static Map Layers for this particular Plan in HEC-RAS Mapper. Please see the Chapter on HEC-RAS Mapper in this document, for details on how to do this.