What unit is ETo expressed in? And what time period does the Total Potable Water Allied (gal) refer to? The CI reference guide states that ETo is expressed in millimeters or inches. My research into ETo indicates that ETo is actually expressed in units of volume/time, and that units of mm/day or in/day are common. The form does not provide any guidance on the units for ETo or the TPWA, although the tables are labeled "July" which suggests that the calculation should produce total consumption for the month of July. The translation of the information provided for our building in Tel Aviv does not provide any units - but the calculation appears to be incorrect as the TPWA is 6,003 and the non-potable water used is 408,970.

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Susann Geithner

Principal

Emerald Built Environments

LEEDuser Basic Member

900 thumbs up

Thu, 12/06/2012 - 14:00

Michael. you may find your answer here: The new guidance for international projects also includes a resource for evapotranspiration data worldwide. Here is the link http://bit.ly/sp275F Also find the guideline for international projects here. http://bit.ly/tYhrtV

Omar Elrawy

Green Building Consultant | Researcher

GreenA Consultants

LEEDuser Basic Member

38 thumbs up

Wed, 07/10/2013 - 08:10

Susann, I have the same issue with the TPWA, and the link you've supplied is not working with me (gives a 403 forbidden message), so would you just tell me what time period does the Total Potable Water Allied (gal) refer to? thanks

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