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

treating stored rainwater?

we have a tank in our project that will store rainwater. because our landscape theoretically doesn't require irrigation, it seems this cistern would only serve the purpose of SSc6.1 I understand storing and slowly releasing rainwater isn't the same as treating it - but im wondering if there is any kind of tried and true simple (cheaper) method of treating from the cistern? (ex: filters, etc?). if so, anyone have product info I could have our civil engineer reference?

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

Tue, 09/16/2014 - 23:25

I would look into the feasibility of Snoit inlet filters on your inflow pipes.

Wed, 09/17/2014 - 14:51

thanks Michael, unless im misunderstanding - the snoit filters I found on website are catch basin filters? our civil engineer seems to think this might not be acceptable for the Stormwater quality ordinances in Houston area. So it might satisfy LEED but not Houston (?). I wouldn't know... civil engineer is checking on that, but in mean time im wondering if there is anything that can be used at the cistern. my understanding is that the cistern alone doesn't treat anything (even if suspended solids "settle" etc). so eventually overflow/excess cistern water will be slowly let out into storm sewers - "untreated". (?). I guess im just wondering if there is some kind of feature/add-ons to cisterns that might accomplish this?
Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Wed, 09/17/2014 - 16:15

You are correct, a cistern does not treat anything, and if you are releasing the water from the invert of the cistern, and solids that settle will be let out as well. I would look at means to treat upstream of the cistern, so that water that enters the cistern is already treated. If snouts aren't acceptable (hard for me to believe) then look at alternate means, veggie swales, raingardens, disconnected roof leaders, street sweeping .....
Profile picture for user Lyle Axelarris
Lyle Axelarris
Building Enclosure Consultant
BPL Enclosure
LEEDuser Basic Member
58 thumbs up

Wed, 09/17/2014 - 16:52

I'm not understanding the purpose of the cistern. If you're not using it for water reuse, then what is it doing? Are you not allowed to use infiltrators? For water quality, have you considered hydrodynamic separators such as Vortech or StormFilter from Contech?

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