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

Residential Default Fixture Uses

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Tomas Kurka
LEED AP
Gardiner & Theobald
LEEDuser Basic Member
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Hi, I am working on LEED certification of hotel project. My question is regarding water closet use.I know that for residential, there is 5 uses/ day But what is the number of low flush and full flush uses for hotel guests. Guidance talks about 1:2 ratio between full : low flushes, but I am not sure how this works for total o 5 uses. Thanks in advance. Tomas

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Mon, 08/05/2013 - 17:51

Hi Tomas, I assume you have a dual flush scenario with no urinals. We have encountered this also and didn't find any clear guidance. We have used 2 full and 3 half for both male and female. Considering the extensive Additional Water Reduction guidance document, it would be nice if this question could be specifically answered in the guidance or by LEEDuser in the facts above.

Fri, 08/16/2013 - 16:16

Hi Tomas, The Water Use Reduction Additional Guidance document states that residential projects must use a 1:2 ratio in terms of the number of full-flush to low-flush uses per day. Instead of using the typical 5 flush residential scenario, it’s essentially the same weighted average calculation as the commercial dual-flush (without urinals). For example, if the dual-flush water closet is 1.6/0.8 gpf, the residential weighted average would be 1.07 gpf.

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