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NC-v4 SSc4:Rainwater management

Low-Impact Development strategy - Rainwater harvest+dry-wells

Dear all,

I am working on a project (NC-V4, not zero-lot line) with a rainwater harvest for flushing toilets and for irrigation.

The harvest capacity is about the 20% of the run-off volume, while the rest is managed through a dry-wells system (after a contaminant and pollutant cleaning treatment). As a result, all the run-off volume goes into the aquifer and nothing goes into the urban sewerage.

Could the combination of rainwater harvest and dry-wells be considered as a Low-Impact Development strategy? 

I took a look on EPA website, but I haven't found any clarification about it.

Thanks,

Claudio

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

Thu, 09/21/2017 - 15:04

The reuse for the toilet flushing is a grey area. That's not really mimicking the natural hydrologic cycle. Irrigation should be fine, provided you can actually use all the water.

Thu, 09/21/2017 - 15:17

Thanks for your reply Michael. The reused rainwater actually covers the totally of the irrigation demand (about the 20% of the run-off volume). Could I achieve the credit if the remaining 80% is managed through dry-wells? Therefore, all the run-off volume goes into the aquifer and nothing goes into the urban sewerage).
Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Thu, 09/21/2017 - 18:12

I think it is a viable approach. Be sure to beef up the narrative about the irrigation....you want to explain that this volume is returned to the hydrologic cycle via evaptranspiration and transpiration.

Thu, 09/21/2017 - 19:32

perfect, thanks again!

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