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FAQs about WEc1 :

Do the 30% and 40% reductions need to be achieved prior to the application of alternative water sources in order to earn the credit?

When pursuing Option 2 do I have to use the EPA WasterSense Water Budget Tool or USGBC’s Outdoor Water Use Reduction Calculator?

Does the project site need to have a minimum amount of vegetation in order to pursue the credit?

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EBOM-v4 WEc1:Outdoor water use reduction

Evapotranspiration (ETo) Data Sources

The resources link for this credit directs us to use the ETo software calculator from the FAO website: http://www.fao.org/nr/water/eto.html Previously I have used the WaterSense website to get ETo data, but after pressing the "go" button, the data does not pop up anymore: http://www3.epa.gov/watersense/new_homes/wb_data_finder.html In lieu of the software, would it be acceptable to use this source to gain ETo data? After entering the latitude and longitude of your site, the ETo is provided with fewer steps than the software. It looks like it uses the Penman-Monteith equation like the above software does, but without the ample technical jargon. http://wcatlas.iwmi.org/Default.asp Are there any concerns with using the IWMI to get ETo data to satisfy this credit?

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Edward Malesevich
Sustainability Advisor
Transwestern Sustainability Services
LEEDuser Basic Member
12 thumbs up

Tue, 03/08/2016 - 14:29

Hi Stephanie, We have started to utilize the IWMI Online Climate Summary website for several pieces of climate information, one being ETo. I definitely agree with your statement about this website being much simpler to use than other sites, and their methodology is solid. You should be fine using the IWMI site for your ETo data.

Wed, 03/23/2022 - 14:27

The IWMI website no longer has the IWMI Online Climate Summary Service Portal with the ETo values, what is the new source you are using?
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Trista Brown
Project Director
WSP USA
LEEDuser Basic Member
381 thumbs up

Thu, 03/24/2022 - 17:55

Hi Priscilla - this website works for me: https://www.epa.gov/watersense/water-budget-data-finder

Thu, 03/24/2022 - 21:27

Hi Trista, I'm looking for evapotranspirstion rates outside the US, my projects are based in the Middle East      
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Trista Brown
Project Director
WSP USA
LEEDuser Basic Member
381 thumbs up

Tue, 03/29/2022 - 20:50

Hi Priscilla - thanks for clarifying. Have you checked whether there are any USGBC Chapters in the countries where you're working? They might be a good source of information. Unfortunately I don't have any ETo sources for the Middle East.
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Devendra Chaughule
Senior Manager - Sustainable Services
Surmount
LEEDuser Basic Member
29 thumbs up

Wed, 05/11/2022 - 16:10

Hi Trista, Did you get any ETo source outside US? I am also looking similar data for India.
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Trista Brown
Project Director
WSP USA
LEEDuser Basic Member
381 thumbs up

Wed, 05/11/2022 - 16:50

Hi Devendra - I recommend reaching out to USGBC Chapters in India, or the India Green Building Council, to see if they can support. Unfortunately I don't have ETo data for India. 

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