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WWHM-SWMM Tech Specs:

Green Roofs

The WWHM-SWMM Green Roof element includes state-of-the-science algorithms that correctly and accurately model green roof evapotranspiration and discharge via roof drains.

Rainfall on a green roof must go somewhere. Reports to the contrary, green roof runoff doesn't just disappear. The green roof water either go up into the atmosphere through evapotranspiration or down a roof drain into a stormwater collection system.

The WWHM-SWMM Green Roof element models actual evapotranspiration based on daily potential evapotranspiration (PET), taking into account the depth of the soil layer on the roof and the type of green roof vegetation specified.

The user inputs the green roof surface area, the maximum distance to the nearest roof drain (including where the outlet drains to), the roof slope, the thickness of the soil layer, and the type of vegetation on the roof.

WWHM-SWMM computes the runoff and evapotranspiration from the green roof using HSPF continuous simulation hydrology.