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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

No-irrigation documentation

Hi all, 
What sort of documentation do you submitt to demonstrate no need for irrigation in international projects? (i.e. we don´t have a tool like the USDA hardiness zones)
I am supplying monthly rainfall rates and days with rain, and a general characterization of planting material (non-natives used for xeriscasping and  natives that naturally grow on drier zones of the same eco-region).
We have been doing no-irrigation landscapes for more than 14 years, and I know our designs will work, I just don't know how to clearly convey it to the reviewer. 
Initial watering will be done by hand with hose bibs for a period of one year. Project is located in a tempered humid zone. 
There's little to no guidance on this path. 
Thanks!

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Afogreen Build
www.afogreenbuild.com
Green Building Consultant
LEEDuser Premium Member
249 thumbs up

Mon, 03/18/2024 - 01:04

Hi Alexia,
No irrigation required for landscape means that the landscape does not require a permanent irrigation system beyond a maximum two-year establishment period (LEED BD+C v4 guide page 259).
To demonstrate compliance with no irrigation required, evidence from government or journal showing that the plant is drought tolerant so don’t need irrigation shall be provided, as well as following documentation to be submitted:  
  1. A narrative describing the planting and explain why they will not require irrigation beyond their specified establishment periods. Indicate why average rainfall will be sufficient
  2. A landscaping plan showing native plants may be provided to confirm that irrigation will not be required, based on local rainfall and plants’ water demands
  3. Documentation showing the vegetation is drought tolerant, no irrigation required once established, and native plant (if native to project location)

Best regards - Afogreen Build Team

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