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NC-2009 SSc6.2:Stormwater Design—Quality Control

Rainwater storage tank TSS removal efficiency

Hi. We have designed a rainwater storage tank for dirty rainwater, with a bigger capacity than required. The water, after being storaged for a while, is pumped to the local sewerage system. I have read in this forum different approaches for this and is not clear to me. Can we then confirm that a bigger storage tank is enough to settle the TSS? or should we add any additional treatment? thanks

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Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Tue, 02/10/2015 - 12:40

I don't know that your idea of capturing and pumping this out to the local storm sewers passes the smell test. In theory, this water is reused for gardening, landscaping etc. The majority of the solids do settle out in the cistern, and anything pumped out through the reuse process is filtered by the mulch beds, etc. If you have a pump, that will likely be drawing from the bottom of the cistern, at face value to me it seems like you're only storing the solids before dumping them back into the local storm drains. I'd definitely want more information on the pump, and what kind of filtration it provides, if any. To me this seems to be the key part of your question.

Wed, 04/01/2015 - 12:33

Thanks Michael, Finally we have decided to install an additional treatment before the water reaches the local storm drains because we are afraid that GBCI will not accept the removal only via settling. In the same building we have also a tank capturing water from the roof. We have filters removing 90% of TSS and then the water is reused mostly for flushing toilets. Can we assume a final 100% TSS removal even if the reuse is only for flushing? Thanks

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