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What performance threshold do I need to achieve for an Exemplary Performance point?

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

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?

How can green roofs count as a stormwater control measure?

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I have 100-year data—how do I convert to 2-year?

Is it an acceptable strategy to capture the rainwater into tanks and discharge it into the public sewers after the rainstorm reducing the peak discharge?

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

Using a water table tank as a retaining method for compliance

Our project is capturing rainwater and sending it to a water table tank (I don't know if this is the correct term, it is the tank that recieves water from the water table below foundations). The tank is big enough to comply with credit compliance, but I am wondering if LEED requires a specific tank dedicated to captured rainwater or if we can use this water table tank to fulfill credit requirements. Thanks

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David Posada
Integrated Design & LEED Specialist
SERA Architects
LEEDuser Expert
1361 thumbs up

Mon, 10/10/2011 - 19:49

David, As long as the tank is sized big enough for both functions it should be fine. We've seen storage tanks that have multiple functions being allowed - for example, a tank that originally was only to be used for storing fire protection water was increased in size and used also to store rain water. In our area, we've used the term "de-watering" for ground water that is pumped out from below a foundation, but it sounds like the same thing.

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