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FAQs about WEp1 :

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?

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?

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

WC average flow rate for residential use

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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Wed, 01/25/2012 - 17:00

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)".

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