According to the calculation showed at document WATER USE REDUCTION - ADDITIONAL GUIDANCE v011209, the average flow rate is defined by:
[(Male full-flush uses/day×full-flush rate)+(Female full-flush uses/day×full-flush rate)+(Female low-flush uses/day×low-flush rate)]/(male and female total uses/day)=1.2 gallons
Our project was 205 FTE (45% female and 55% male) and 25 transients (57% female and 43% male), so the average of FTE would be:
Option 1 - [(1×1.6)+(1×1.6)+(2×0.8)]/4=1.2 gallons
OR
Option 2 - [(112,75×1.6)+(92,25×1.6)+(92,25×0.8)]/297,25=1.35 gallons
Does anyone was already made this calculation?
With options is the right one?
Tks
Hannah Pham
20 thumbs up
April 19, 2010 - 5:55 pm
Option 2 is more acurate because it accounts for the different male/female ratios. However, remember to use total number of flushes (not people). Your equation should look like this:
[(112.75x1.6)+(92.25x1.6)+(184.5x0.8)]/389.5=1.22gallons
I created an Excel spreadsheet to calculate water savings. If you would like a copy of it, my email address is hpham@uskh.com.
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
April 20, 2010 - 3:29 am
Always double check the LEEDonline calculations with your own. They have been buggy in the past.