Stormwater Modeling and Management

In addition to modeling the generation and transport of runoff flows, GeoSWMM can also estimate the production of pollutant loads associated with this runoff. The following processes can be modeled for any number of user-defined water quality constituents:

• Dry-weather pollutant buildup over different land uses

• Pollutants wash-off from specific land uses during storm events

• Direct contribution of rainfall deposition

• Reduction in dry-weather buildup due to street cleaning

• Reduction in wash-off load due to BMPs

• Entry of dry-weather sanitary flows and user-specified external inflows at any point in the drainage system

• Routing of water quality constituents through the drainage system

• Reduction in constituent concentration through treatment in storage units or by natural processes in pipes and channels.