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NC-2009 WEc1:Water Efficient Landscaping

Reference ET rates

Does anyone have a good resource for locting reference ET rates for all regions in US? the rain bird resource that is listed on this site and in LEED reference guide no longer exists from what i can tell. and the only other resource listed is for TX. Specifically, I am looking for Chicago, but have other projects in other regions as well. Thanks,

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Erica Downs
LEED Consultant
The Green Engineer
LEEDuser Basic Member
188 thumbs up

Thu, 04/21/2011 - 20:40

Go to the Rain Bird link http://www.rainbird.com/landscape/products/controllers/etmanager.htm. Scroll down and click on tab "Manuals Literature and Utilities." Download and install the ET Manager Scheduler Software. Open the program and click on "ET" in the menu bar, then on "Historical ET" in the drop-down menu. This opens a new window, where you can select your State and region/city. Click on your city, and a bar graph appears with monthly ETo data. This is the best I've found so far.
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Erica Downs
LEED Consultant
The Green Engineer
LEEDuser Basic Member
188 thumbs up

Thu, 05/05/2011 - 18:33

Another website for ETo is the EPA WaterSense "Water Budget Data Finder" http://www.epa.gov/watersense/nhspecs/wb_data_finder.html Just enter your zip code. However, it is a little unclear if the resulting ETo is for peak month or an annual average. If anyone can figure that out, this site is much easier to use than the Rain Bird link above.
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Erica Downs
LEED Consultant
The Green Engineer
LEEDuser Basic Member
188 thumbs up

Tue, 05/24/2011 - 15:53

Following up on the EPA WaterSense webiste ETo data, I confirmed with the helpline that the displayed ETo is for the Peak Month. The only hitch is if your zip code's peak month is other than July... otherwise this is a very straight-forward, easy-to-use data source.

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