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WWHM-SWMM Tech Specs:

Permeable/Porous Pavement

The WWHM-SWMM Permeable Pavement element includes state-of-the-science algorithms that correctly and accurately model the movement of water through permeable/porous pavement.

Permeable/porous pavement offers unique opportunities to reduce or eliminate runoff from what would otherwise be an impervious surface. Water drains through the permeable pavement into a gravel sublayer/subgrade that provides storage and discharge through either an underdrain and/or infiltration to the native soil.

The WWHM-SWMM Permeable Pavement element models this vertical movement of water draining into the gravel subgrade, its storage, and discharge.

WWHM-SWMM computes the runoff and evaporation from the permeable pavement and the gravel subgrade using HSPF continuous simulation hydrology.

The user inputs the physical dimensions of the permeable pavement, the outlet configuration (including whether or not there is an underdrain and/or infiltration to the native soil), thickness and porosity of the pavement and gravel subgrade, and the bottom slope. If the bottom slope is greater than 2% then the user needs to include an effective volume factor to account for the placement of dams in the gravel layer to prevent water flowing to and ponding at the bottom of the slope.

The WWHM-SWMM Permeable Pavement element also includes the option for inflow from adjacent impervious or pervious surfaces and ponding on the permeable pavement, if allowed.
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