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NC-2009 WEp1:Water Use Reduction—20% Reduction

Dual flush - average flow rate and fixture uses

Looking at the Water Use Reduction - Additional Guidance in the section for Dual flush, they say: " For the female water closet usage, there is a 1:2 ratio in terms of number of full-flush to low-flush uses per day. For the male water closet usage, there is a full-flush usage per day." Does this mean that if a visitor female with 0.5 uses/day and male visitor with 0.1 uses/day according to the default fixture uses, then in the average for dual flush the default uses are broken down by the ratio like this? Male: (0.033 uses/day x full flush rate) + (0.066 uses/day x full flush rate) + Female (0.166 uses/day x full flush rate) + (0.332 uses/day x full flush rate) divided by 0.6 total female & male uses. Is this assumption correct?

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Mon, 01/05/2015 - 15:12

Based on the Water Use Guidance document example you would calculate visitor dual-flush uses as: [(0.1 use/day * 1.6 gpf) + (0.1 use/day * 1.6 gpf) + (0.4 use/day * 1.1 gpf)] / 4 uses/day = 1.27 gpf avg. flow rate (with urinals) Hope this helps!

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