To meet this prerequisite, teams must design and install plumbing systems using high efficiency indoor plumbing fixtures including lavatory faucets, toilets, urinals, kitchen sinks, and showerheads, and determine how much 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. is consumed relative to a LEED baseline case.
In order to meet the prerequisite, a minimum of 20% savings must be demonstrated.
The calculation is performed using a calculator developed by USGBC. Teams should become very familiar with the calculator, the information needed to complete it, and the various rules for using it in order to accurately assess performance and demonstrate prerequisite compliance.
In addition to meeting the 20% performance threshold, teams must select WaterSense labeled fixtures for any fixture type that is eligible for the WaterSense label. Remember that your project must also meet prescriptive requirements for appliances 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. equipment, including clothes washers, dishwashers, pre-rinse spray valves, ice machines, heat rejection and cooling, cooling towers, and evaporative condensers.
Yes. Any fixture that can be labeled by WaterSense must have the label.
Currently, tank-type toilets, water-using urinals, private lavatory faucets, and showerheads can be WaterSense labeled, so must be labeled for this prerequisite. Aerators and flow restrictors added to private lavatories or showers must also be WaterSense labeled. Tankless toilets (flush-valves), non-water using flush fixtures (waterless urinals, composting toiletsComposting (or Nonwater) toilet systems are dry plumbing fixtures and fittings that contain and treat human waste via microbiological processes.), and public lavatory faucets do not have be WaterSense labeled because no label currently exists for those fixture types.
To reduce indoor water consumption.
For the fixtures and fittings listed in Table 1, as applicable to the project scope, reduce aggregate water consumption by 20% from the baseline. Base calculations on the volumes and flow rates shown in Table 1.
All newly installed toilets, urinals, private lavatory faucets, and showerheads that are eligible for labeling must be WaterSense labeled (or a local equivalent for projects outside the U.S.).
Install appliances, equipment, and processes within the project scope that meet the requirements listed in the tables below .
gpm = gallons per minute
lpm = liters per minute
In addition, water-consuming appliances, equipment, and processes must meet the requirements listed in Tables 4 and 5.
Project teams can complete the USGBC 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.
Use this template to develop a letter from the project owner committing to share whole-building water and energy usage data.
We're working on a HC project in Mexico, but we seem to be having trouble complying with what is required for process equipment in table 5 of this pre-req. Would somebody be able to share what equipment or manufacturer was contacted to comply with these requirements?
LEED v4 has a table (table 4) on page 58 that stipulates specific numbers of gallons of water allowable to either sterilize or wash in instrument tray. can anyone comment from where these values were derived?
I'm looking at Table 4 and see requirements for Dishwashers that are limited by the rack. I don't see where this is impacting instrument sterilization.
Susan, it's in LEEDv4 BD &C page 58. Table 4. For medical or lab facilities. Listed 3rd on the table is Sterile process washer @ .35 gal/US tray. The lowest product available in the market uses approx. 4 or 5 gallons / US tray. feel free to email me as well. firstname.lastname@example.org
I am working of the PDF version of the Reference Guide. Page 58 is a blank page! When I go to the credit, Table 4 only lists Dishwasher, Food steamer and Combination oven.
Table 1 is about baseline water consumption, EPA standards.
Table 2 is Appliance water use standards with no mention of sterilizers.
Table 3 is heat rejection and cooling and cooling tower and evap condenser standards.
Table 5 deals with water discharge temperature and vacuum drains.
Are you looking at an older or newer v4 standard?
Susan, yes I am using LEED v4. if you would like to provide me your email address I would be happy to send you a screen capture with highlights. seems the page number on your document may not align with mine. I am looking under WE Credit - Indoor Water Use Reduction. Specific to Lab and medical equipment. its the very last portion before WE Credit: Cooling Tower Water Use. Thanks. My email address is email@example.com
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