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CS-2009 SSc6.1:Stormwater Design—Quantity Control

Low Anual Rainfall Average

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Ron Dean
Sumac Inc.
LEEDuser Basic Member
20 thumbs up

Our project is located in a city with a very low annual rainfall average (8.3mm that is about 0.327 inches per year). The project will have a green roof in about 60% of the roof area. It is possible to direct the slopes of the other 40% of impervious area of the roof to the green roof. These will be sufficient to control runoff from all the rain water. It is possible to apply to the credit under these conditions. Thanks.

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Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Tue, 08/06/2013 - 12:38

This is a very common practice. I will typically try to put the 60% green in the middle, with the outer edges directed inward. I let the actual roof designer work out the details, but from a stormwater approach, that is how I go at it.

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