Hi,
The 2009 version of LEED included an interpretation for the SS6.1 credit stating that controling site discharge using storage such as cisterns could meet the credit requirements even if the entire discharge eventually ends up in the municipal system as long as the stormwater is held long enough to reduce the 24-hour peak rate and quantity. However, it states that the cistern has to have enough capacity to account for rainfall stored in the cistern from previous days (you can't assume its empty when the 2 year storm starts. Does anyone know what volume you are expected to assume is still in the cistern from previous days?
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Lindsay Austrom
Mechanical EngineerStantec
21 thumbs up
January 31, 2013 - 12:05 pm
Hi Meghan,
On past projects I have done a daily cistern volume analysis including all water in (rain from drainage area) less water out (irrigation, release to municipal storm main, etc) to show how much capacity is available in the cistern. You can find daily rainfall data on the Environment Canada website: http://www.climate.weatheroffice.gc.ca/Welcome_e.html
Meghan MacSween
Morrison Hershfield Inc.February 7, 2013 - 8:12 am
Thanks for your response Lindsay. We'll give this a try.