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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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CS-2009 WEp1:Water Use Reduction

Faucet Flow Duration

When calculating for a low-flow fixture, it is required to enter a duration (which is default set to 30 seconds). There is a footnote that says "Duration may be modified for special circumstances". I have no idea what this means. It makes sense that a metered faucet would have a duration, but a low-flow fixture just runs for as long as needed (probably like 12-15 seconds each use). When I calculate total water reduction with low-flow fixture duration set to 30 seconds, I do not hit the 20% reduction needed for the prerequisite. But when I change the duration to 15 seconds, I can hit the 20%. Is it ok for me to change the duration?

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Sun, 09/23/2012 - 15:27

Hi Kevin, The lavatory duration should be listed in the form calculations as a 30 second duration, as outlined in the LEED Reference Guide for Green Building Design and Construction, 2009 Edition (Updated June 2010) Addenda (WEp1 posted 2/2/2011). If you have a metering type / autocontrol lavatory faucet, the duration may be set to as low as 12 seconds; in this case you will have to convert from GMP to GPC as outlined in the Water Use Additional Guidance document on the USGBC website (http://www.usgbc.org/ShowFile.aspx?DocumentID=6493). Hope helpful!

Mon, 09/24/2012 - 15:56

Carlie- Thanks for the response. I am still unclear why 30 seconds is the duration... this seems like a long time for water to be running. Regardless, I know I can set the duration to 12 seconds with a metering type faucet, but I am unclear as to what you mean by an autocontrol faucet? Can this be just any type of hand sensor activated faucet, or does it have to be one of the types that runs for a specific period of time once activated? Thanks again for the help.

Mon, 09/24/2012 - 22:51

Kevin - this would include either an autocontrol faucet with metering control (dispense water for a pre-determined period of time) or automatic fixture sensor (motion detector).

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