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Credit language straight from USGBC
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- Rating System CS 2009Core & Shell
- Rating System SSSustainable Sites
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Rating System
SSc6.1Stormwater Design—Quantity Control
- SSp1Construction Activity Pollution Prevention
- SSc1Site Selection
- SSc2Development Density and Community Connectivity
- SSc3Brownfield Redevelopment
- SSc4.1Alternative Transportation—Public Transportation Access
- SSc4.2Alternative Transportation—Bicycle Storage and Changing Rooms
- SSc4.3Alternative Transportation—Low-Emitting and Fuel-Efficient Vehicles
- SSc4.4Alternative Transportation—Parking Capacity
- SSc5.1Site Development—Protect or Restore Habitat
- SSc5.2Site Development—Maximize Open Space
- SSc6.1Stormwater Design—Quantity Control
- SSc6.2Stormwater Design—Quality Control
- SSc7.1Heat Island Effect—Nonroof
- SSc7.2Heat Island Effect—Roof
- SSc8Light Pollution Reduction
- SSc9Tenant Design and Construction Guidelines
CS 2009 SSc6.1: Stormwater Design—Quantity Control
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7 Comments
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
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.
Retention tank
Hi all,
We are working on a project in Prague with imperviousnessResistance to penetration by a liquid and is calculated as the percentage of area covered by a paving system that does not allow moisture to soak into the ground. >50% (Case 2). We would like to build a retention tank which will collect rainwater and than slowly release the collected water to a public drainage system. The collected water will be used for irrigation (WEc1a and WEc1b) as well but the irrigation system will use LESS than 25% of the collected rainwater.
Are we eligible for this credit if we decrease stormwater runoff more than 25% during a storm (and therefore decrease burden on public drainage system) but afterwards slowly release the water from the tank in order to be ready for the next storm?
Thank you for any suggestions.
Delaying the discharge of the stormwater means you reduce the rate. To use it for irrigation means you will reduce the volume. Since you have to use case 2, you will have to reduce the volume by 25%. If the irrigation isn't enough maybe you can improve the imperiousness of your site. More vegetated areas, open grid paving. If that's not an option you could also use infiltration wells or other underground infiltration systems to achieve 25% reduction. We did a project in Munich, which was using an infiltration system (rigole).
Retaining rainwater for future uses
Will capturing all rainwater and keep it in a tank for future uses such as cooling towers and irrigation? Our project will not infiltrate it but reuse it instead.
Yes, capturing and storing rain water for irrigation, cooling towers, etc is a great way to meet the storm water quantity reduction. The most common problem is not having a storage tank that is big enough to prevent over flowing in typical conditions.
You will want to show calculations of the 1- and 2- year design storms, but also show that you are using the water from that tank quickly enough that it will have room for the next storm event. There's a related conversation about a similar situation over at NC 2009 SSc6.1 from this month, and also one from Jun 15 2010.
Hope that helps!
I just checked the NC2009 discution and it is really good, the one from june. The case of having some use for the water that has been just collected before the next event is perfectly clear.
I'm thinking about this:
Our project is a mixed used with several buildings in it. Only one bulding (with its related grounds) will apply for certification.
The rainwater collected within the LEED boundary will be used for cooling towers and irrigation. However, the real demand for cooling towers will be supplied almost in its entirety by treated water so I am almost 100% sure that some rainwater collected will remain at the water collection tank. I was wondering if use this remaining water for other buildings' needs will satisfied the intention of this credits. The water will leave the LEED boundary however it will not reach the municipal sewage nor any other municipal system.
I don't know if I explained myself properly.
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