WMMS
The Watershed Management Modeling System (WMMS) is a tool developed for application in LA County watersheds that combines a watershed and receiving water model with a structural BMP performance model to identify cost-effective implementation strategies.
The Windows-based interface allows a user to establish runoff volumes and pollutant loads for baseline and post-BMP conditions and evaluate potential structural stormwater BMP scenarios in their area of interest without having extensive watershed modeling expertise. WMMS is comprised of two components: Loading Simulation Program C++ (LSPC, another model defined in this database), and the Regional Optimization system. With the RegionalOptimization system, WMMS is capable of evaluating cost-effective combinations of local-scale low impact development (LID) type BMPs and watershed scale BMPs. The model determines the optimal distribution that attains the desired Total Maximum Daily Load (TMDL) targets for a variety of pollutants for the lowestBMP implementation cost. WMMS utilizes the System for Urban Stormwater Treatment and AnalysisIntegration (SUTAIN, another model defined in this database) to calculate the most cost-effective set ofBMPs, and optimizes its results for large scale analysis.
Intended User: WMMS is intended for use by stormwater program managers in LA County. To run analyses outside the scope of the current model, expertise in watershed modeling is recommended.
Geographic focus: Model defaults Geographic focus: are specific to LA County.
Scale: Watershed
Developer: Tetra Tech, on behalf of Los Angeles County Flood Control District. wmms@dpw.lacounty.gov