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FAQs about WEp1 :

Will the reviewers accept a spreadsheet as a plumbing fixture schedule in lieu of the plans from the Construction Documents?

In LEED review comments I've been referred to the Water Use Reduction Additional Guidance document. I didn't know this was a required reference document.

Should I include bar sinks? What about mop sinks or janitor sinks? Swimming pools? Safety showers? Bidets? Tub spouts?

We provided new showers in our project to comply with the alternative transportation credit. Should they be considered in WEp1 calculations?

Can you explain the 12-second duration for metering faucets?

Can I use a nonpotable water source to contribute to WEp1 compliance?

Our project does not have any eligible water fixtures in the project boundary. Can we comply with WEp1?

We are having trouble finding EPAct-compliant fixtures. Is that a problem?

Where can I find a clear meaning of "public" and "private" as relevant to lavatory faucets?

Our project is a factory with historically a 95% male workforce. The restroom design accounts for this. Can I argue that the male/female gender ratio is different than 50/50?

Are shower duration controls an acceptable water-saving strategy?

Can I include process water savings in order to earn an Exemplary Performance point?

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Forum discussion

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

Residential Dual Flush Fixture Usage

We are evaluating dual flush fixtures for our residential project. I see in the Water Use Reduction guidance the weighted average methodology. And they comment on the 1:2 ratio of full to low flushes. This is the commercial usage pattern and is predicated on one "BM" per day. However, residential usage is 5 flushes per day (rather than 3). Are we to assume for the weighted average calculation that it is still a 1:2 ratio? That in fact for residential use there are 2.5 "BM's per day? Or do we stay with one full flush and 4 low flush uses?

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Thu, 01/05/2012 - 23:20

I never encountered this situation but I would try conservative approach. Hopefully this will achieve the reduction percentage you are looking for.

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