Hi all, We are working on a project in Prague with imperviousness >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.

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Susann Geithner

Principal

Emerald Built Environments

LEEDuser Basic Member

900 thumbs up

Wed, 06/22/2011 - 15:14

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).

Michael Smithing

Director - Green Building Advisory

Colliers International Ltd.

LEEDuser Basic Member

201 thumbs up

Thu, 01/23/2014 - 09:57

Where did you get the information on the 2 year 24 hour storm intensity for Munich/Prague? I'm working on a project in Split (among other places) and could use a good source of storm data.

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