Our project is the only development on a small, flat, island. The surface is sand or sandy topsoil and is extremely porous. After development, the only impervious surfaces will be roofs, some of which will harvest rainwater. Rainfall from the other roofs will infiltrate naturally into the sand. There is no runoff into the surrounding lagoon as all rainfall infiltrates into the water table. Given that no specific stormwater design is needed, will it be sufficient for documentation to show that 100% infiltration remains post development? Thanks
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Amy Rider
Sustainability ManagerKEMA Services
161 thumbs up
March 2, 2011 - 6:19 pm
Yes, 100% on site infiltration is an acceptable means to obtaining this credit. The reviewers will likely want to see some calculations or supporting documentation showing that the soil types and grading can adequately infiltrate the additional rainwater from the impervious surfaces that aren't being captured, but this shouldn't have to be very extensive. Be sure to describe your rainwater harvesting system as well to further support your claim.