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Goals:Reduce the quantity of the water needed for the building.
Reduce municipal water supply and treatment burden.
Water Efficiency
WE Prerequisite 1Water Use Reduction
IntentTo increase water efficiency within buildings to reduce the burden on municipal water supply and wastewater systems.
NC: REQSCHOOLS: REQCS: REQ
WE Credit 3Water Use Reduction
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
RequirementsNC, SCHOOLS & CSReduce building potable water use from the baseline.
WE Prerequisite 1 & WE Credit 3Water Use Reduction
RequirementsThe following fixtures, fittings and appliances are outside the scope of the water use reduction calculation: Commercial Steam Cookers Commercial Dishwashers Automatic Commercial Ice Makers Commercial (family-sized) Clothes Washers Residential Clothes Washers Standard and Compact Residential Dishwashers
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Implementation Install flow restrictors and/or reduced flow aerators Install and maintain automatic faucet sensors and
metering controls Install low-flow and low-flush fixtures Install non-water fixtures
Harvest / Collect rainwater
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Documentation and CalculationsDetermine the type and number of occupants.
Retain manufacturers’ data showing the water consumption rates, manufacturer, and model of each fixture and fitting.
List plumbing fixtures by usage group, if applicable.Define any usage groups.
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Documentation and CalculationsThe calculated water use reduction for the project is the difference between the calculated design case and a baseline case.
Water use calculation is based on fixture and fitting water consumption rates and estimated use by the occupants
Occupants’ estimated use is determined by calculating full-time equivalent (FTE) and transient occupants and applying appropriate fixture use rates to each.
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Documentation and CalculationsFixture Usage GroupsFixture usage groups are subsets of washroom facilities used by different types of occupants.
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Documentation and CalculationsCalculating OccupancyNC & CSIdentify the number of building occupants by occupancy type. In buildings with multiple shifts, use the number of FTEs from all shifts. Include the followinga. Full-time staffb. Part-time staffc. Transients (students, visitors, retail customers)d. Residents
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Documentation and CalculationsSCHOOLSIdentify the total number of building occupants for each occupancy type. In buildings with multiple shifts, use the number of full-time equivalents (FTEs) from all shifts.a. Full-time staffb. Part-time staffc. Studentsd. Transients (volunteers, visitors, etc.)
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Documentation and CalculationsNC, SCHOOLS & CSAssume a 1-to-1 gender ratio
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Timeline and TeamPredesignDesign Architect / Mechanical EngineerConstructionOccupancy
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Referenced StandardsThe Energy Policy Act (EPAct) of 1992 (and as amended)The Energy Policy Act (EPAct) of 2005
WE Prerequisite 1 & WE Credit 3Water Use Reduction
Exemplary PerformancePrerequisite – NoneWE Credit 3 – 45%
WE Prerequisite 1 & WE Credit 3Water Use Reduction
IntentTo limit or eliminate the use of potable water or other natural surface or subsurface water resources available on or near the project site for landscape irrigation.
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
RequirementsNC, SCHOOLS & CSOPTION 1Reduce potable water consumption for irrigation by 50% from a calculated midsummer baseline case.
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
RequirementsReductions shall be attributed to any combination of the following items: Plant species factor Irrigation efficiency Use of captured rainwater Use of recycled wastewater Use of water treated and conveyed by a public
agency specifically for non-potable uses
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
RequirementsNC, SCHOOLS & CSOPTION 2Do not use potable water for irrigation
ANDPATH 1Use only captured rainwater, recycled wastewater, recycled graywater or water treated and conveyed by a public agency specifically for nonpotableuses for irrigation.
ORPATH 2Install landscaping that does not require permanent irrigation systems. Temporary irrigation systems used for plant establishment are allowed only if removed within 1 year of installation
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationUse native and drought-tolerant plants that can survive on natural rainfall.
Climate Tolerate PlantsMinimize Turf
Utilize Techniques such as:MulchingAlternative MowingComposting
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationCapture rainwater on-site for irrigation purposes.
Consider using for Irrigation: Stormwater Graywater Condensate Water
Minimize the amount of turf and use only where needed for recreational or pedestrian use. Turf typically requires irrigation and creates a monoculture that does not encourage biodiversity.
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationSpecify high-efficiency irrigation systems, such as, drip irrigation which delivers water to plant roots so less water is lost to evaporation.
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationRegularly monitor irrigation systems to ensure that they are watering on desired schedules.
Do not irrigate plants during winter months.
Mulch landscaped areas to assist with water retention.
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationGood Approaches:
High-Efficiency Irrigation StrategiesMicro-irrigation systemsMoisture sensorsRain shut-offsWeather-based evapotranspiration controllersDrip systems – use 30% - 50% less water than sprinklers
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationGood Approaches:
Rainwater CollectionCisternsUnderground TanksPondsRain Barrels
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationGood Approaches:
Rainwater CollectionRoofsPlazasPaved Areas
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationGood Approaches:
Wastewater RecoveryOn-siteMunicipal
On-Site:GraywaterWastewater Treatment
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationGood Approaches:
Wastewater RecoveryOn-siteMunicipal
On-Site:GraywaterWastewater Treatment
WE Credit 1Water Efficient Landscaping
Graywater:Wastewater from:SinksShowersWashing MachinesCooling TowerCondensation from AC Systems
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
ImplementationGood Approaches:
Wastewater RecoveryOn-siteMunicipal
On-Site:GraywaterWastewater Treatment
WE Credit 1Water Efficient Landscaping
Graywater:Wastewater from:SinksShowersWashing MachinesCooling TowerCondensation from AC Systems
No Human Waste or Food Processing
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
Documentation and CalculationsPerform calculations of the baseline and design case to show the percentage reduction in water demand, and report what portion of irrigation will come from each nonpotable source (if any).
Prepare a landscape plan showing a planting schedule and irrigation system.
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
Documentation and CalculationsBaseline Case vs Design CaseFor each Landscape Area:Calculate KL KL = Ks x Kd x KmcDetermine ET0 for your region (July)
Calculate ETL ETL [in] = ET0 x KL
KL – Landscape CoefficientKs – Species FactorKd – Density FactorKmc – Microclimate Factor
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
WE Credit 1Water Efficient Landscaping
KL = Ks x Kd x Kmc
ETL = ET0 X KL
KL = Ks x Kd x Kmc
ETL = ET0 X KL
BLDG
Which two variables remain constant when calculating the design and baseline cases?
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
WE Credit 1Water Efficient Landscaping
KL = Ks x Kd x Kmc
ETL = ET0 X KL
KL = Ks x Kd x Kmc
ETL = ET0 X KL
BLDG
Which two variables remain constant when calculating the design and baseline cases?
Kmc & ET0
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
WE Credit 1Water Efficient Landscaping
Baseline Case TWA [gal]Design Case TWA [gal]
Percent Reduction of Potable Water
Baseline H20% Reduction
% Reduction = 100 x [1 – Design H20 /Baseline H20]
Design H20
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
Timeline and TeamPredesignDesign Architect / Mechanical Engineer / Civil Engineer
ConstructionOccupancy
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
Referenced StandardsNone
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
Exemplary PerformanceNone
WE Credit 1Water Efficient Landscaping
NC: 2-4 ptsSCHOOLS: 2-4 ptsCS: 2-4 pts
IntentTo reduce wastewater generation and potable water demand while increasing the local aquiferrecharge.
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
RequirementsOPTION 1Reduce potable water use for sewage conveyance by 50%through water conserving fixtures (water closets, urinals) or non-potable water (captured rainwater, recycled graywater, and on-site or municipally treated wastewater).
OR
OPTION 2Treat 50% of wastewater on-site to tertiary standards. Treated water must be used on-site or infiltrated.
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
ImplementationSpecify:
High Efficiency Fixtureslow flowdual flush
Dry Fixturescomposting toiletsnon-water urinals
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
ImplementationReuse for sewage conveyance:StormwaterGraywater
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
ImplementationConsider:On-site wastewater treatment
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
ImplementationConsider:Constructed Wetlands
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
ImplementationConsider:High-efficiency Filtration Systems
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsOption 1:Using the WE Prerequisite 1 calculations, determine the baseline and design case of only the flush fixtures, to determine whether potable water consumption is reduced by 50%.
Option 2:Determine the amount of wastewater compared with the capacity of the wastewater treatment system available.
Compile information about system schematics and the capacity of any rainwater of graywater systems.
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsPlumbing Drawings of on-site wastewater treatment facilities□ Calculated occupants [ Default 1 to 1]□ Calculated Baseline Water usage□ Calculated Design Water Usage
Provide:Fixture ManufacturerFixture ModelFlush Rate in gallons per flush [GPF]
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsTotal non-potable water for sewage conveyance [gal] (if using)
□ If treating wastewater provide the annual quantity (gal) of:Water treatedTreated water infiltratedTreated water that is re-used on site
□ Narrative describing potable water reduction strategies employed by the project.
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsOPTION 1Full Time Equivalent - FTETransient Building Occupants – daily average
Baseline CaseUse Energy Policy Act of 1992 for Fixture Flush Rates
Design CaseActual WC & Urinals Specified
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsAssumptions50% males & 50% females
Daily Uses:MalesWC 1 useUrinal 2 uses
FemalesWC 3 uses
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsEnergy Policy Act of 1992
Flush Rate for Fixtures:Conventional Water Closet 1.6 GPFConventional Urinal 1.0 GPF
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsCommercial Building - 14 FTEBaselineWC, Women 3 x 1.6 GPF x 7 = 33.6 galWC, Men 1 x 1.6 GPF x 7 = 11.2 galUrinal, Men 2 x 1.0 GPF x 7 = 14.0 gal
TPW daily = 58.8 galDesignWC, Women 3 x 1.1 GPF x 7 = 23.1 galWC, Men 1 x 1.1 GPF x 7 = 7.7 galUrinal, Men 2 x 0.0 GPF x 7 = 0.0 gal
TPW daily = 30.8 gal
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsCommercial Building - 14 FTEBaselineWC, Women 3 x 1.6 GPF x 7 = 33.6 galWC, Men 1 x 1.6 GPF x 7 = 11.2 galUrinal, Men 2 x 1.0 GPF x 7 = 14.0 gal
TPW daily = 58.8 galDesignWC, Women 3 x 1.1 GPF x 7 = 23.1 galWC, Men 1 x 1.1 GPF x 7 = 7.7 galUrinal, Men 2 x 0.0 GPF x 7 = 0.0 gal
TPW daily = 30.8 gal
WE Credit 2Innovative Wastewater Technologies
% Reduction
= 100 x (1 – 30.8/58.8)
= 47.6%
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Documentation and CalculationsOPTION 2
Annual Volume of Sewage GeneratedAnnual Volume of Wastewater Treated and Reused and/or infiltrated On-Site
Calculate the percent reduction of wastewater that is released into the municipal sewer system.
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Timeline and TeamPredesignDesign Architect /Mechanical Engineer / Civil Engineer
ConstructionOccupancy
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Referenced StandardsThe Energy Policy Act (EPAct) of 1992 (and as amended)
The Energy Policy Act (EPAct) of 2005
The 2006 editions of the Uniform Plumbing Code or International Plumbing Code
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
Exemplary Performance100% reduction in potable water use for sewage conveyance
OR
On-site treatment and re-use/infiltration of 100% of generated wastewater
WE Credit 2Innovative Wastewater Technologies
NC: 2 pointsSCHOOLS: 2 pointsCS: 2 points
IntentTo maximize water efficiency within buildings to reduce the burden on municipal water supplyand wastewater systems.
WE Credit 4Process Water Use Reduction
NC: NASCHOOLS: 1 pointCS: NA
RequirementsSCHOOLSTo receive this credit, buildings must have the following:
No refrigeration equipment using once-through cooling with potable water
No garbage disposals
WE Credit 4Process Water Use Reduction
X
NC: NASCHOOLS: 1 pointCS: NA
RequirementsAt least 4 process items where water use is at or below the levels shown in the table below. Inclusion of any equipment not listed in the table below must be supported by documentation showing a 20% reduction in water use from a benchmark or industry standard.
WE Credit 4Process Water Use Reduction
NC: NASCHOOLS: 1 pointCS: NA
ImplementationAssess all water-using process equipment within the school and select water-efficient options.
WE Credit 4Process Water Use Reduction
NC: NASCHOOLS: 1 pointCS: NA
Documentation and CalculationsRetain manufacturers' data showing the water consumption rates, manufacturer, and model of each appliance.
Assemble information about the baseline water use based on industry standards for any equipment that is not listed in the credit requirements.
WE Credit 4Process Water Use Reduction
NC: NASCHOOLS: 1 pointCS: NA
Timeline and TeamPredesignDesign Architect /Mechanical Engineer / Project OwnerConstructionOccupancy
WE Credit 4Process Water Use Reduction
NC: NASCHOOLS: 1 pointCS: NA