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FAQs about 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?

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?

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Forum discussion

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

Reference for the Total Daily Uses numbers

Neshat Sakeena

Sustainability Consultant

Ramboll

LEEDuser Basic Member

2 thumbs up

December 5, 2016

Hello, I was just wondering if anyone knows the reference or basis of the numbers used in Table 2. Default Fixture Uses, by Occupancy Type in the LEED manual? Example; The default for residential occupants is 5 uses per day of water closet and lavatory faucet, 1 shower, and 4 kitchen sink uses. Cheers, Neshat Sakeena

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Jean Marais

b.i.g. Bechtold DesignBuilder Expert

LEEDuser Basic Member

581 thumbs up

Tue, 12/06/2016 - 08:57

From memory the rates and uses per day are from the IPC (international plumbing code). In MEP design both anual usage and peak (or design) rates are considered. The designer needs to size equipment (pumps, filters, pipe dimensions) to deal with peak demand rates that are subject to ratios of concurrent usage, AND caluculate the annual water usage based on daily usage. The two are however not the same.

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