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WWHM-SWMM Tech Specs:

Continuous Simulation

WWHM-SWMM uses continuous simulation to accurately model the generation of runoff from rainfall and the routing of runoff through user-defined conveyance systems.

As explained in Doug Beyerlein's article "Dumbing Down Hydrology" (published in the July-August 2016 issue of Stormwater magazine), single-event modeling does not work. Using a single hypothetical storm event to design a stormwater system or mitigation facility does not provide the stormwater engineer with any real information on how the stormwater system will work in real world conditions with real world rainfall. This is a problem.

The solution is to use EPA HSPF continuous simulation hydrology to model the entire hydrologic cycle for multiple years at an hourly or smaller time step. Routing runoff through a conveyance system can be done using either HSPF or SWMM or both interactively. WWHM-SWMM includes both EPA HSPF and EPA SWMM together with long-term historic rainfall and evaporation data stored in a database directly accessed by WWHM-SWMM.

The user inputs the drainage area soils, vegetation, and land slope in a visual interactive Windows interface. The user can then select one or multiple generic and commercial stormwater storage and water quality facilities (including LID practices) available in WWHM-SWMM and route the runoff to a downstream point of compliance to meet NPDES MS4 permit requirements.

Most WWHM-SWMM conveyance and storage elements also includes an auto-sizing feature to assist the user in selecting the optimal size for the hydromodification or water quality facility to meet NPDES MS4 requirements.

For more information contact:

 Joe Brascher, 360-943-0304, brascher@clearcreeksolutions.com