The project intends to collect stormwater from the totality of the roofs: part of it will be stored in an underground tank for the irrigation of the terraces (no green roof in the project, the stored part is marginal) and the rest will be discharged in a nearby irrigation canal that streams to farmlands, some kilometers south of the building.

My question is:

Is this kind of approach compliant with the requirements “best replicating natural site hydrology”?

I have one more doubt: with the zero lot line the project can manage the 85th percentile, with the approach above I am managing the 100th percentile of the event, right?

Thank you so much for any suggestions, advices.

Costanza

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Michael DeVuono

Regional Stormwater Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Thu, 04/12/2018 - 20:13

You need to infiltrate the volume of the 85th percentile storm, you can't let any of it runoff. They sometimes get weird about capture/reuse as well, are these terraces connected to the soil profile? If so, then I would make that case....if they are LS features on some balcony you may have a hard time selling this. Why not lose the tank, and use some form of modular tanks or just stone and let it infiltrate?

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Harvesting storm water on a zero-lot-line project and discharging in a nearby canal

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