HEC-HMS for hydrologic modeling
Use HEC-HMS to perform calculations similar to those of HEC-1, covering a variety of precipitation and runoff processes.
Precipitation Modeling
- Model hypothetical storm events based on frequency.
- Use the U.S. Army Corps of Engineers standard project storm for hypothetical storms in the U.S. east of the Rocky Mountains.
- Consider historical storm events through cell-based precipitation data.
- Import precipitation data from other sources.
- Specify gages and a method of weighting the gages, including user-defined and inverse distance-squared weighting.
Basin Modeling
- Compute sub-basin runoff in either a lumped or linearly distributed fashion.
- Determine losses based on several methods, including Green & Ampt, SCS Curve Number, gridded SCS Curve Number, and the
- Initial/Constant method.
- Transform precipitation to runoff through either unit hydrograph methods (Clark, Snyder, or SCS) or Kinematic Wave methods.
- Route hydrographs using Kinematic Wave, Modified Puls, Muskingum, or Muskingum-Cunge.
- Divert flow, either losing the diverted hydrograph or adding it back in further downstream.
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