This tutorial and guide series explores the Frequency Analysis compute type in HEC-HMS. You can achieve similar results by creating multiple Simulation Run compute types, each targeted at a specific return period (e.g., the 100-year event, or 0.01 annual exceedance probability). However, the Frequency Analysis compute type has several advantages:
faster setup time
consolidated input and results within a single compute
a computed flow-frequency or stage-frequency curve that can be compared against curves from other analyses, such as a Bulletin 17C analysis
Data
The provided watershed–Indian Creek–has been divided into four subbasins, with a computation point at the Marion Junction. The initial watershed has been calibrated to the July 2014 event. The project contains the input data needed for a rainfall-runoff frequency analysis, including NOAA Atlas 14 precipitation-frequency grids for the 24-hour duration, 2-year through 1000-year events, and the NOAA Atlas 14 Volume 8, temporal distribution Area 3, second-quartile 50% temporal pattern. Nine hypothetical storm meteorologic models that use the Atlas 14 grids are also included.
Existing simulation runs include a calibration simulation for the July 2014 event, as well as a simulation run for each of the nine frequency events. The initial project represents how frequency events were modeled before the Frequency Analysis compute type was added.
Series
The tutorials and guides below make up this series. Download the initial project files at the top of this page before you start.
