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NC-v4 SSc4:Rainwater management

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Dear all, we're planning to install tank for collecting 180% of stormwater from 95 percentile rainfall event. Collected rainwater will be used for irrigation, but there won't be any sprinkler system at the site - it's planned that there will be special vehicle that will take in water and deliver it to the vegetated area needed to be irrigated. In other words irrigation will be performed manually. How do you think, is it OK with the intent of the credit or do we still need to arrange direct irrigation system on site? Thank you all in advance.

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

Tue, 08/02/2016 - 11:49

I don't know about the 180% part, but your approach seems reasonable. I would document what you are doing in a clearly written narrative, that explains your approach, the amount of runoff collected, and the amount used for irrigation.

Tue, 08/02/2016 - 11:55

Michael, thank you very much for your reply. Could you please explain what's wrong with 180%? Do you think the tank should be larger?
Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Tue, 08/02/2016 - 12:09

Oh I get it now. The volume of the tank is 180% of the required volume. I got it now. Should it be larger? Only you can know, I would make sure the volume is such that it actually satisfies your irrigation requirement without requiring you to finish the job with potable water. Then do you want to plan for a dry period? That's entirely up to you.

Wed, 08/03/2016 - 13:08

Yes, exactly, the tank will be sized for 180% of the required volume. Well, actually we're planning to install drought-tolerant landscaping that will not require irrigation at all. We decided to install tank for harvesting rainwater mostly to comply with requirements of the Rainwater Management credit. So the irrigation is not necessary in that case, it's an additional measure required simply to reduce runoff volume from the project site. So, every time the tank is filled up with rainwater we will discharge it by watering green areas of the site. How do you think, does this approach seem logic? I'm not sure about it as it seems kind of unreasonable to harvest water for irrigation of plants that do not need to be irrigated. :/

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