we are working on a hotel project where the guest rooms are provided with dual flush (4.5L/3L) WCs. no urinals are provided. as per the LEED guideline a single person use WCs 5 times per day in residential use. how can we calculate the average flush rate in these circumstances. should we assume that 1/4 (full flush/half flush) ratio or (2/3) (full flush/half flush) ratio? or is there any other basis to calculate this? thanks in advance.
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Michelle Rosenberger
PartnerArchEcology
522 thumbs up
January 25, 2012 - 12:00 pm
Hi Udana,
My recent response from the USGBC on this issue. They consider the existing Additional Water Reduction Guidance document which directs you to use a 1:2 ratio for commercial projects to apply for residential projects also for both males and females. "average volume based on a proportion of 2 half/1 full flush (3.33:1.67 or 3 half to 2 full if you prefer)".