The Hydrologic Modeling System (HEC-HMS) is designed to simulate the runoff process of drainage basins. HEC-RAS is used for modeling water flowing through systems of open channels and computing water surface profiles. HEC-RAS applications include floodplain management studies to evaluate floodway encroachments. The Hydrologic Modeling System (HEC-HMS) designed to be applicable in a wide range of geographic areas for solving the widest possible range of problems. This includes large river basin water supply and flood hydrology, and small urban or natural watershed runoff.
The basic computational procedure of HEC-RAS for steady flow is based on the solution of the one-dimensional energy equation. Certain simplifications must be made in order to model some complex flow situations using the HEC-RAS one-dimensional approach.
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