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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

Interpolation of bimonthly water bills for monthly summaries

Similar to how extrapolation of data for a submeter that was recently installed is appropriate, can I interpolate between bimonthly water bills in order to produce the monthly consumption summary? If so, does anyone have an acceptable interpolation method to share?

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Wed, 01/30/2013 - 18:49

Hi Ryan The key thing about this credit is that you have to provide weekly meter readings, at a minimum. These readings are not required to be automated, and therefore could be taken manually. The manual allowance is there for instances where bills come in monthly, bi-monthly, or quarterly intervals. Thanks Hannah

Wed, 01/30/2013 - 21:56

That makes sense, but perhaps my question was unclear. Since weekly readings weren't taken until the performance period, I cannot be expected to use weekly readings to satisfy the "monthly and annual consumption summaries" requirement of this credit's documentation, correct? Exporting Energy Star data is an acceptable method, and that is often tracked by using monthly bills. But if a property receives bills less frequently (e.g., bimonthly, quarterly), what is an appropriate interpolation method to produce a summary with monthly granularity as part of the tracker that must accompany the credit form? Or could I just do a bimonthly trend analysis instead of a monthly analysis for the 2 years that are required for the summary? Thanks!

Thu, 01/31/2013 - 16:51

Hi Thanks for the clarification. Yes, you can take the data collected during the performance period and extrapolate monthly and annual summaries. But again, this credit requires that meters are also read and recorded weekly (at a minimum) during the performance period. Hope this helps!

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