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

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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 SSc6.2:Stormwater Design—Quality Control

Rainwater Harvesting

Our project is harvesting and reusing rainwater for flushing. rainwater that falls on the roof is collected in a 10cubic meter sump. during a heavy rain the sump is allowed to over flow and the excess rainwater would flow through the drainage system. how should we calculate the following. 1) Percent site treated by implementing rainwater harvesting 2) TSS removal efficiency of the system Thanks

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Profile picture for user amy.rider
Amy Rider
Sustainability Manager
KEMA Services
LEEDuser Basic Member
110 thumbs up

Wed, 02/22/2012 - 22:33

1. The percent of site treated via rainwater harvesting (for the roof alone, you'll need to account for the rest of the site separately) will be a result of the storage volume compared to the anticipated rainfall across the roof area. 2. The captured rainfall that is reused for toilet flushing has a TSS Removal rate of 100%.

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