Dear Leedusers, our project will install a retention tank which will collect storm water from the whole LEED area. The retention tank will provide water for flushing toilets and watering greenery. Even though the size of the tank is about 240 m3 (8500 cf) it is possible that during 2-year 24 hour design storm some of storm water will be drained to the municipal drainage system. According the LEEDonline it seems that all BMP's contain WC flushing and it would be TSS removal rate of 100%. I don''t think that we can state 100% total weighted average TSS removal efficency when some of the stromwater could be drained to the municipal system during some non-standard storms. I would be grateful for any suggestions or experiences. Jiri

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Michael DeVuono

Regional Stormwater Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Mon, 09/09/2013 - 13:56

How will the stormwater bypass the tank when it is full? I think your best bet, and easiest to quanify and demonstrate, would be to provide some type of treatment BMP that gets you the 80% TSS removal on the bypass water. I wouldn't even want to begin trying to quantify a geometric mean weighting of the 100% in the tank, and the byapss with a lower removal rate, as you will always have varying amounts of water stored in the tank, therefore, varying amounts of water bypassing the tank. All this being said, I am assuming the 8500 cf is less than your 90% runoff volume, correct?

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