Schools–NC-v4 WEc2: Indoor water use reduction

  • Exceed the prerequisite requirements

    This credit rewards projects that exceed the requirements specified in the indoor water use reduction prerequisite. Additional points are earned for every 5% of additional savings over the prerequisite requirement of 20%, up to 50% savings. An additional Innovation point can be earned for exemplary performanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements. for projects that achieve savings of 55% or greater.

    What’s New in LEED v4

    • Under the Retail, Healthcare, Hospitality, and Schools rating systems, LEED now includes opportunities to earn appliance and 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. savings credits.
    • Duration-based savings from autocontrol faucetsAutocontrol faucets have automatic fixture sensors or metering controls. with sensors or metering controls are no longer allowed, since studies have shown that autocontrol faucets do not produce water savings.
    • To earn points, the USGBC requires you to provide fixtures that meet occupant needs. The nearest available restrooms are used in credit calculations when no bathroom facilities are located within the project boundaries. These additional facilities can be excluded from the prerequisite requirements.
    • The WaterSense label requirements that were recommended in LEED 2009 are now mandatory for projects in the U.S., with a local equivalent allowed elsewhere.

    FAQs

    Our plumbing fixtures are served, in part, by nonpotable water. How do we account for this?

    Nonpotable water cannot be applied to the prerequisite calculation, but it can contribute to compliance for the corresponding credit. Once the annual design case water is calculated, nonpotable water can be subtracted to determine total water savings.

  • WE Credit 2: Indoor water use reduction

    Intent

    To reduce indoor water consumption.

    Requirements

    Further reduce fixture and fitting water use from the calculated baseline in WE Prerequisite Indoor Water Use Reduction. Additional potable waterWater that meets or exceeds U.S. Environmental Protection Agency drinking water quality standards (or a local equivalent outside the U.S.) and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. savings can be earned above the prerequisite level using alternative water sources. Include fixtures and fittings necessary to meet the needs of the occupants. Some of these fittings and fixtures may be outside the tenant spaceTenant space is the area within the LEED project boundary. For more information on what can and must be in the LEED project boundary see the Minimum Program Requirements (MPRs) and LEED 2009 MPR Supplemental Guidance. Note: tenant space is the same as project space. (for Commercial Interiors) or project boundary (for New Construction). Points are awarded according to Table 1.

    Table 1. Points for reducing water use

    Percentage reduction Points (BD&C) Points (Schools, Retail, Hospitality, Healthcare) Points (ID&C) Points (CI Retail) Points (CI Hospitality)
    25% 1 1 2 2 2
    30% 2 2 4 4 4
    35% 3 3 6 6 6
    40% 4 4 8 8 8
    45% 5 5 10 10 10
    50% 6 -- 12 -- 11



    Meet the percentage reduction requirements above.

    AND
    Appliance and process water

    Install equipment within the project scope that meets the minimum requirements in Table 2, 3, 4, or 5 . One point is awarded for meeting all applicable requirements in any one table. All applicable equipment listed in each table must meet the standard.

    Schools, Retail, and Healthcare projects can earn a second point for meeting the requirements of two tables.

    Table 2. Compliant commercial washing machines

    To use Table 2, the project must process at least 120,000 lbs (57 606 kg) of laundry per year.

    Washing machine Requirement (IP units) Requirement (SI units)
    On-premise, minimum capacity 2,400 lbs (10 886 kg) per 8-hour shift Maximum 1.8 gals per pound * Maximum 7 liters per 0.45 kilograms *

    * Based on equal quantities of heavy, medium, and light soil laundry.




    Table 3. Standards for commercial kitchen equipment

    To use Table 3, the project must serve at least 100 meals per day of operation. All process and appliance equipment listed in the category of kitchen equipment and present on the project must comply with the standards.


    Kitchen equipment Requirement (IP units) Requirement (SI units)
    Dishwasher Undercounter ENERGY STAR ENERGY STAR or performance equivalent
     Stationary, single tank, door ENERGY STAR ENERGY STAR or performance equivalent
    Single tank, conveyor ENERGY STAR ENERGY STAR or performance equivalent
    Multiple tank, conveyor ENERGY STAR ENERGY STAR or performance equivalent
    Flight machine ENERGY STAR ENERGY STAR or performance equivalent
    Food steamer Batch (no drain connection) ≤ 2 gal/hour/pan including condensate cooling water ≤ 7.5 liters/hour/pan including condensate cooling water
    Cook-to-order (with drain connection) ≤ 5 gal/hour/pan including condensate cooling water ≤ 19 liters/hour/pan including condensate cooling water
    Combination oven, Countertop or stand ≤ 1.5 gal/hour/panincluding condensate cooling water ≤ 5.7 liters/hour/pan including condensate cooling water
    Roll-in ≤ 1.5 gal/hour/pan including condensate cooling water ≤ 5.7 liters/hour/pan including condensate cooling water
    Food waste disposer Disposer 3-8 gpm, full load condition; 10 minute automatic shutoff or 1 gpm, no-load condition 11–30 lpm, full load condition; 10-min automatic shutoff or 3.8 lpm, no-load condition
    Scrap collector Maximum 2 gpm makeup water Maximum 7.6 lpm makeup water
    Pulper Maximum 2 gpm makeup water Maximum 7.6 lpm makeup water
    Strainer basket No additional water usage No additional water usage

    gpm = gallons per minute

    gph = gallons per hour

    lpm = liters per minute

    lph = liters per hour





    Table 4. Compliant laboratory and medical equipment

    To use Table 4, the project must be a medical or laboratory facility.


    Lab equipment Requirement (IP units) Requirement (SI units)
    Reverse-osmosis water purifier 75% recovery 75% recovery
    Steam sterilizer For 60-inch sterilizer, 6.3 gal/U.S. tray

    For 48-inch sterilizer, 7.5 gal/U.S. tray
    For 1520-mm sterilizer, 28.5 liters/DIN tray

    For 1220-mm sterilizer, 28.35 liters/DIN tray
    Sterile process washer 0.35 gal/U.S. tray 1.3 liters/DIN tray
    X-ray processor, 150 mm or more in any dimension Film processor water recycling unit
    Digital imager, all sizes No water use



    Table 5. Compliant municipal steam systems

    To use Table 5, the project must be connected to a municipal or district steam system that does not allow the return of steam condensate.


    Steam system Standard
    Steam condensate disposal Cool municipally supplied steam condensate (no return) to drainage system with heat recovery system or reclaimed water
    OR
    Reclaim and use steam condensate 100% recovery and reuse



LEED v4 Indoor Water Use Reduction Calculator

Project teams can complete the Indoor Water Use Reduction Calculator for LEED v4 BD+C and ID+C WE Prerequisite Indoor Water Use Reduction and LEED v4 BD+C and ID+C WE Credit Indoor Water Use Reduction usage-based calculations as well as LEED v4 O+M WE Prerequisite Indoor Water Use Reduction and LEED v4 O+M WE Credit Indoor Water Use Reduction Option 1. 

The calculator includes assumptions for baseline water use. Use the summary tab in the calculator to complete the form in LEED Online.

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Jun 24 2017
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