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The EPA WaterSense methodology and calculator allows only certain types of irrigation to be assigned to certain vegetation types. Why is this and won’t it skew results?

What if we just have a little green area on our rooftop? Is there a minimum amount of landscaped area to earn the prerequisite and credit?

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NC-v4 WEp1:Outdoor water use reduction

green roofs

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Geoffrey Katz
Landscape Architect, former Vice-Chair, Sustainable Sites TAG
LEEDuser Basic Member
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Hello all, Under Option 1 are vegetated (green) roofs considered as part of the landscape that requires (or does not require) a permanent irrigation system? Under Option 2 are vegetated roofs to be included in the calculations? This is for both the Prerequisite and the Credit for Outdoor Water Use Reduction.

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Wed, 03/29/2017 - 15:11

Hi Geoffrey, Good question. Is your vegetated roof used as a food garden? If so, the reference guide says this vegetation can be included or excluded at the project teams discretion. However, if the vegetated roof is not used exclusively for growing food, it would need to be included in both the credit and prerequisite. I hope that helps!

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