Developing Model Alternatives

A model alternative is a single configuration with a specific set of inputs and parameters. A second model alternative would be defined by a different configuration or different inputs or parameters. Since model alternatives do not include time-specific data, you can use a model alternative with any time window.

Initially, you develop alternatives using the software of the native model (e.g., HEC-HMS, HEC-ResSim, HEC-RAS, and HEC-FIA). Then, you import these alternatives into CWMS. Once they have been imported, you use the Setup module to configure and edit specific model alternatives for CWMS.

In the Setup module, you will create model alternative keys that will be used in creating a forecast run. Each key is a single alpha-numeric identifier that represents a model alternative. For example, the Key N might represent normal conditions, the Key W might represent wet conditions, and the Key D might represent dry conditions (for three different HEC-HMS model alternatives). Refer to Model Alternatives and Forecast Runs section for additional information on model alternatives.