A Model Alternative is a single model configuration with a specific set of input and parameters. A second model alternative would be defined by a different configuration or different input or parameters. A Forecast Run is a single forecast scenario defined by a specific set of data, information, and model alternatives. A second forecast run would be defined by different data, information, or model alternatives. Model alternatives run sequentially during a forecast.

Model alternatives and forecast runs are described in this chapter. The model alternatives and forecast runs are manipulated primarily in the Setup Module of CWMS. Setup Module provides a detailed description of the Setup Module and its interface.