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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?

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

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

Active Sample Form not calculating Annual Water Consumption

I am using the active sample form to calculate my usage. Seems basic, 13 FTE and 48 transients. I am making different usage groups. But when I enter the info and calculate the form is showing 0 in the Annual water consumption columns? Shouldn't it calculate it for me? It is from the usgbc site.

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Mon, 02/11/2013 - 16:55

I think I figured it out! lol I didn't enter the days of operation. That would be noted by the architect correct? this is a LEED CI so the PIF3 form would show that? It hasn't been registered yet, we are still trying to work out possible points.

Mon, 02/11/2013 - 17:15

Hi Kasandra, It's good to hear that you are using the sample forms to run some preliminary calculations prior to registering the project. Yes, once the project is registered in LEED Online the annual days of operation will be listed in PIf3 and will link to the WEp1 form. Note that the fixture groups are meant to define occupant groups (i.e. office, warehouse, retail, etc.) within the building that use a specific subset of flow and flush fixtures. If your project occupants have similar usage patterns, one fixture usage group may be used to represent the entire tenant occupancy and the form will automatically calculate the daily usage rates for each fixture based on the percent male/female as entered in the Fixture Group form table when the group is assigned to each fixture. Hope helpful!

Mon, 02/11/2013 - 17:24

Thank you! It is an office with FTE and Transients so I was going to do a group for each. The forms are so helpful.

Mon, 02/11/2013 - 17:29

Unless the FTE and transients use different fixtures (with different flow/flush rates) then no need to list a group for each...you can list one fixture group in the form table and it will automatically calculate the daily usage rates for these occupant types.

Mon, 02/11/2013 - 17:33

Well there are two sets of bathrooms. The FTE have showers in their bathroom. Otherwise all the fixture types will be the same. So mayby just make a group of the FTE and showers?

Mon, 02/11/2013 - 17:38

You can identify one group if the FTE and transients have access to the same fixture types between these two bathrooms...the form will automatically calculate the correct daily uses for the FTE and transient numbers you list for this group (e.g. it will calculate the daily uses for the FTE shower use, and excludes transient shower usage). :)

Mon, 02/11/2013 - 17:42

The showers are in the bathroom in the back office area where the transients use the front bathrooms. It is a government office building with waiting area. So the visitors don't really have access to the shower I would say.

Mon, 02/11/2013 - 17:44

Yep, the form takes this into account - that transients do not utilize the showers (per the LEED default daily usage rates outlined in the LEED Reference Guide).

Mon, 02/11/2013 - 17:49

oh wow. So you just simplified this for me quite a bit. Thank you! this forum is so helpful. It is my first project to work on so I have alot to learn. Thank you for all your help.

Mon, 02/11/2013 - 17:54

glad to help! you can take the time listing out each of these groups, but there's really no need in your project case, so I was hoping to save you some time. If your front restroom had different flush/flow fixture rates from the back restroom, and the transients only had access to the front restroom, then this scenario would require you to list different fixture groups to accurately account for this... hope this helps clarify.

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