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FAQs about WEc1 :

We can't get weekly readings from the main building water meter. However we can take daily readings from a water subsystem (e.g. irrigation or cooling tower makeup). Can we pursue Option 2 (water subsystem metering) without pursing Option 1 (whole buildin

What kind of meter reading documentation is required to meet the items requested on the credit form? The LEED Online credit form requests both weekly readings, and then also monthly and annual summaries.

What is the best way to track the monthly and annual water consumption summaries for the whole-building and subsystem water meters?

If a building’s meter or submeter was installed less than a year ago, how can we provide monthly and annual summaries?

The water utility for the project building supplies electronic readings of whole building water consumption at least weekly that the project team can access. Will the electronic readings suffice for the required documentation for WEc1?

We own our water meters and the manufacturer of the submeter does not provide documentation recommending a calibration interval. How can we document that we’ve met the calibration requirements?

For meters not owned by a third-party, when should the meter calibration take place in order to comply with WEc1?

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Forum discussion

EBOM-2009 WEc1:Water Performance Measurement

Weekly Meter Readings

I am wondering if the weekly meter readings need to be done on the same day every week? Can we read the meter on a wednesday and then on a thursday of the next week or read the meter on a thursday and then on a wednesday of the next week? Does it matter? Thanks for the clarification.

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Barry Giles
Founder & CEO, LEED Fellow, BREEAM Fellow
BuildingWise LLC
LEEDuser Expert
224 thumbs up

Fri, 06/17/2011 - 21:58

No not really... First, thank you for actually reading them...your problem, should there really be one, is when you post the readings to whatever excel spread sheet you are using. If the meter readings are coming from a manufacturing process (using millions of gallons a day) then the variation between the missing day or the extra day between readings will show up. If you're in a 10,000 sq ft office with 3 occupants then the discrepancy is minimal. I'm sure that you're not considering doing this EVERY 2 weeks, i.e jumping the days about so the whole focus of this credit apart from the act of actually doing the meter readings is to show up any leaks that there may be in the system. (you could overcome this by constructing the math in the excel spread sheet to show actual daily use). From the GBCI's point of view these discrepancies can be answerable however the real point of the credit is to track water usage over a period of time, understand any changes and use the data derived from the readings to make changes to the operations, equipment and occupant training to reduce water consumption

Tue, 06/21/2011 - 18:14

That makes sense. Perhaps we'll just make sure to read it within the first two or three days of each week...and then average out daily usage and we can see any changes pretty quickly. Thanks for your help!

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