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WWHM-SWMM Tech Specs:

Bioretention/Rain Gardens

The WWHM-SWMM Bioretention element includes state-of-the-science algorithms that correctly and accurately model the vertical movement of water through the bioretention engineered soil layers.

The modeling of bioretention hydrologic performance is not the same as modeling a stormwater pond or other stormwater storage facility. Unlike in a pond or a gravel trench, stormwater does not enter the facility and immediately flow to the bottom and fill the facility from the bottom up. Water enters the bioretention facility and flows down from layer to layer to the bottom.

The WWHM-SWMM Bioretention element models this vertical movement with the water entering the facility at the top surface layer. The water then infiltrates into the top layer of engineered soil mix based on the modified Green-Ampt equation. The water moves down through the top soil layer at a calculated rate, determined by Darcy's and Van Genuchten's equations. Each soil layer has a separate set of calculations based on its individual set of soil properties.

The user inputs the physical dimensions of the bioretention facility, the outlet configuration (including whether or not there is an underdrain and/or infiltration to the native soil), and engineered soil mix and thickness for up to three bioretention soil layers. The bioretention element includes specific soil mixes from which the user can choose - or they can input their own.

The WWHM-SWMM Bioretention element also includes an auto-sizing feature to assist the user in selecting the optimal size for the bioretention facility to meet NPDES MS4 requirements.

For more information contact:

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