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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

Interior Irrigation?

Profile picture for user Allison Wilson
Allison Wilson
Sustainability Director
Ayers Saint Gross
LEEDuser Basic Member
5 thumbs up

Our project has interior planting which will be irrigated. Obviously there's nowhere in the Indoor Water Use calculator for irrigation since it addresses only flush/flow fixtures, but it doesn't make a whole lot of sense that the interior irrigation is all considered process water either. The project will also have exterior, irrigated landscape which will be subject to the Outdoor Water Use Reduction prereq/credit. Anyone else have this project experience? Did you account for indoor irrigation water? If so, where?

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Mon, 10/07/2019 - 11:38

Same situation in our project, assistance is highly appreciated. Thanks
Profile picture for user bigm333
emily reese moody
Sustainability Director, Certifications & Compliance
Jacobs
LEEDuser Expert
469 thumbs up

Thu, 07/16/2020 - 06:45

"Maybe this hasn't come up yet for a v4 question, but it came up many times under v3 (it's even in the FAQs there), which had the same approach. It's counterintuitive, but...you just don't count it anywhere. https://leeduser.buildinggreen.com/credit/NC-2009/WEc1#tab-faq
"Do interior planters count in the calculation?
No. LEED defines the scope of the credit as landscaping outside of the building footprint." https://leeduser.buildinggreen.com/forum/irrigation-internal-planting-areas
There was apparently an addendum, too:
"An addendum, ID#100000352 dated 07/19/2010, defines the landscaped area to be considered. It excludes the building footprint so interior plantings are not considered. In any case, interior planting cannot avoid irrigation." Hope that helps here.

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