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 software of the native model, for example, HEC-HMS, HEC-ResSim, HEC-RAS, HEC-FIA, and so on. Once models and their alternatives are created and configured initially, they are imported into the watershed using the import commands in the File menu of the Setup Module. The model alternative import process is detailed in in Importing Watersheds and Model Alternatives. Once imported, the CAVI can then be used to configure and edit specific model alternatives.
CWMS 3.0 uses plug-ins that allow the CAVI to interface with the software programs of the native model. This means that all aspects of model alternatives are configurable using the CAVI native model interface. For example, you can edit HEC-HMS base model parameters directly.
MFP deals with observed meteorological data and future precipitation. You can configure Model Alternatives for use in conjunction with HECHMS to compute a variety of future precipitation scenarios. HEC-MetVue deals with observed meteorological data and future precipitation. You can configure Model Alternatives for use in conjunction with HEC-HMS to compute a variety of observed precipitation scenarios. 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. Its model forecast alternatives are a combination of impact area and hydrograph time series sets. You can edit the parameters within each Model Alternative to reflect changing conditions.