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Why do the requirements focus on 1-year and 2-year, 24-hour storms?

Why include the 1-year storm in the credit requirements? Won't management practices for the 2-year storm be effective?

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The calculations for this credit are always a headache! While our projects are usually awarded the credit, the equations in the LEED Reference Guide are helpful mostly for sizing a reservoir or cistern, but don't help you get to the final results. Does US

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

Drainage Pipe Capacity

Can we count the capacity of underground drainage pipes as the retention capacity? The pipe capacity will then add to the stormwater retention capacity. This method will significantly reduce the need for a large retention tank. Does anyone try this method in a simulation program and what about the response from the reviewer? thanks

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

Mon, 02/18/2013 - 12:18

You certainly can use the volume of your drainage system when attempting this credit.

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