Model Alternatives consist of input data sets and configurations for each model. Model Alternatives configurations do not include time-specific data. Therefore, the Model Alternatives can be used in conjunction with any time window.
In general, models and their alternatives are created using the native model software (for example, HEC-HMS or HEC-ResSim). Once models and their alternatives are created and configured, they are imported into the watershed using the import commands under the File menu of the Setup Module. The model alternative import process is detailed in in Importing Watersheds and Model Alternatives. Once models have been imported, you can configure and edit model alternatives within the CAVI. Alternatives for the Ensemble Forecast Processor can be created directly in the CAVI.
CWMS utilizes plug-ins that allow the CAVI to interface with the software programs of the native models allowing you to configure all aspects of model alternatives using the CAVI. For example, you can edit HEC-HMS base model parameters from within the CAVI.
HEC-MetVue deals with observed and forecasted meteorological data. You can configure model alternatives to compute a variety of observed and forecasted and snowmelt scenarios.
MFP deals with observed meteorological data and future precipitation. You can configure model alternatives to compute a variety of future precipitation scenarios.
MFP Deprecation
CWMS 3.4 is the last version to support MFP. Please migrate to HEC-MetVue.
HEC-HMS model alternatives simulate watershed response to precipitation. You use HEC-HMS model alternatives to forecast future flows.
HEC-ResSim model alternatives assist with reservoir operations, consisting of the physical data representing a river-reservoir system and operating rules for all controllable elements in the system.
HEC-RAS model alternatives describe water surface profile and stages at gage locations, geometry information for a river, and defined flow data sets.
HEC-FIA model alternatives allow you to analyze flood consequences. The model alternatives are a combination of impact area and hydrograph time series sets.
EFP (Ensemble Forecast Processor) model alternatives create statistical metrics from ensemble timeseries. These metrics can be used to influence reservoir operations in an HEC-ResSim model alternative.
