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H2OMAP SWMM is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of H2OMAP SWMM operates on a collection of subcatchment areas on which rain falls and runoff is generated. The advanced routing portion of H2OMAP SWMM transports this runoff through a conveyance system of pipes, channels, storage/treatment units, pumps, and regulators. H2OMAP SWMM tracks the quantity and quality of runoff generated within each subcatchment, and the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period comprised of multiple time steps.

Unequaled Geospatial Hydrologic Modeling Features

H2OMAP SWMM accounts for various hydrological processes that produce runoff from urban areas. These include:

•  time-varying rainfall
•  evaporation of standing surface water
•  snow accumulation and melting
•  rainfall interception in depression storage
•  infiltration of rainfall into upper soil layers
•  percolation of infiltrated water into groundwater layers
•  interflow between groundwater and the conveyance system
• nonlinear reservoir routing of overland flow

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Unmatched Geospatial Hydraulic Modeling Features

H2OMAP SWMMcontains a flexible set of hydraulic modeling capabilities used to route runoff and external inflows through a network of pipes, channels, storage/treatment units and diversion structures. These include the ability to:

• handle networks of unlimited size
• use a wide variety of standard closed and open conduit shapes as well as natural channels
• model special elements such as storage/treatment units, flow dividers, pumps, weirs, and orifices
• apply external flows and water quality inputs from surface runoff, groundwater interflow, infiltration/inflow, dry weather sanitary flow, and user-defined inflows
• choose between uniform flow, kinematic wave, or full dynamic wave flow routing methods
• model various flow regimes, such as backwater, surcharging, reverse flow, and ponding
• apply comprehensive dynamic control (RTC) to pump status, orifice opening and weir level via user-defined control rules

Unparalleled Geospatial Water Quality Modeling Features

In addition to modeling the generation and transport of runoff flows, H2OMAP SWMM can also estimate the production and fate 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
• pollutant washoff from each land use during storm events
• direct contribution of rainfall deposition
• reduction in dry-weather buildup due to street cleaning
• reduction in washoff load due to BMPs
• entry of dry weather sanitary flows and user-specified external inflows at any point in the conveyance system
• routing of water quality constituents through the pipe/channel network
• reduction in constituent concentration through treatment at junction nodes or in storage units.