EBOM-v4 WEc4: Water metering

  • Achievable for many projects

    To earn one point under this credit you must have permanently installed water meters in place for at least two water subsystems. It’s common for projects to meet this requirement by submeteringSubmetering is used to determine the proportion of energy use within a building attributable to specific end uses or subsystems (e.g., the heating subsystem of an HVAC system). irrigation systems and cooling towers.

    Reaching the two-point threshold is more difficult, however. At least four water subsystems must be metered, and it is less common for buildings to have submetering in place for the remaining water subsystem options:

    • indoor plumbing fixtures and fittings,
    • domestic hot water,
    • reclaimed water,
    • and other process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making..

    Team should be aware that there is a performance component to this credit. All meters contributing to credit compliance must be recorded at least weekly during the performance period. Readings can be taken manually or automatically.

    What’s New in LEED v4

    • Having whole building water metering earned one point under LEED 2009, but is now a prerequisite under v4.
    • Under v4, projects must meter two water subsystems to earn one point. Under LEED 2009, teams earned one point for having only one water subsystem metered.

    Readiness Review Questions

    • Is permanently installed metering currently in place for at least two water subsystems?
    • If not, can additional metering be installed?
    • How frequently is water consumption data currently recorded and by whom? The prerequisite requires a weekly reading for all meters contributing to credit compliance, at minimum. Can either automatic loggers or manual readings be used to satisfy this requirement? 

    FAQs

    We currently have metering in place for one water subsystem. We want to install metering for a second subsystem so we can earn this credit. Can we do this during the performance period?

    All meters must be recorded at least weekly during the performance period to earn this credit. You’ll want to be sure all your water meters are in place prior to the start of the performance period so that you’re able to meet the weekly meter-reading requirement. 

    We cannot get weekly meter data from the utility. Does this mean we cannot achieve this credit because the water is tracked monthly instead of weekly?

    This credit does require weekly tracking, so without weekly data from the utility the project would not be eligible for the credit, according to GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC)..

  • WE Credit 4: Water metering

    Intent

    To support water management and identify opportunities for additional water savings by tracking water consumption.

    Requirements

    Establishment

    Establish permanently installed meters; 1 point for two water subsystems, 2 points for four or more water subsystems:

    • Irrigation. Meter water systems serving at least 80% of the irrigated landscaped area. Calculate the percentage of irrigated landscape areaThe landscape area is the total site area less the building footprint, paved surfaces, water bodies, and patios. as the total metered irrigated landscape area divided by the total irrigated landscape area. Landscape areas fully covered with xeriscapingXeriscaping is a landscaping method that makes routine irrigation unnecessary. It uses drought-adaptable and low-water plants as well as soil amendments such as compost and mulches to reduce evaporation. or native vegetationAn indigenous species that occurs in a particular region, ecosystem, and habitat without direct or indirect human actions. Native species have evolved to the geography, hydrology, and climate of that region. They also occur in communities; that is, they have evolved together with other species. As a result, these communities provide habitat for a variety of other native wildlife species. Species native to North America are generally recognized as those occurring on the continent prior to European settlement. Also known as native plants. that requires no routine irrigation may be excluded from the calculation.
    • Indoor plumbing fixtures and fittings. Meter water systems serving at least 80% of the indoor plumbing fixtures and fittings listed in WE Prerequisite Indoor Water-Use Reduction, either directly or by deducting all other measured water use from the measured total water consumption of the building and grounds,
    • Cooling towers. Meter replacement water use of all cooling towers serving the facility.
    • Domestic hot water. Meter water use of at least 80% of the installed domestic hot water heating capacity (including both tanks and on-demand heaters).
    • Reclaimed water. Meter reclaimed water, regardless of rate. A reclaimed water system with a makeup water connection must also be metered so that the true reclaimed water component can be determined.
    • Other process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making.. Meter at least 80% of expected daily water consumption for process end uses, such as humidifiers, dishwashers, clothes washers, and pools.

    Performance

    All meters, including whole-building meter, must be recorded at least weekly and used in a regular analysis of time trends.

    Meters must be calibrated within the manufacturer’s recommended interval if the building owner, management organization, or tenant owns the meter. Meters owned by third parties (e.g., utilities or governments) are exempt.

    Commit to sharing with USGBC the resulting water usage data for a five-year period beginning on the date the project accepts LEED certification.

3 Comments

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ARDOR GREEN ARDOR ARCHITECTS
Aug 12 2017
LEEDuser Member
4 Thumbs Up

Rainwater Harvesting - Irrigation and Reclaimed Water?

Project Location: Vietnam

We have an office project that will have some large rainwater collection tanks that will be used for irrigation. Since reclaimed water and irrigation are two separate subsystems under this credit, can a rainwater tank for irrigation serve as both of these subsystem uses?

Thanks very much,

Doug Snyder
HCMC, Vietnam

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Kristina Pobre Architect
Jul 28 2016
Guest
17 Thumbs Up

Weekly Log

Project Location: Philippines

Is there a minimum number of logs required to be submitted to comply with this credit?

The project I am handling wishes to install the meter but because of the log requirement, we might need to delay our submission target date...

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Trista Little Sustainability Manager, YR&G Jul 29 2016 LEEDuser Expert 6063 Thumbs Up

At least 3 months worth of logs needs to be provided, since that's the minimum length that the performance period can be for any credit or prerequisite.

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Aug 16 2017
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