1. LEED NC Water Efficiency 5 points Slide Editor: James A
LEED NC Water Efficiency 5 points Slide Editor: James A. Strapko LEED Source:

2. WE Credit 1.1 Water Efficient Landscaping – 50% Reduction

3. WE 1.1: 1 Credit Water Efficient Landscaping – 50% Reduction
Quite a few credits deal with something called Graywater and Blackwater. Graywater is defined by the UPC (uniform plumbing code) as untreated wastewater that has not come in contact with toilet waste. Examples are shower water, water from sinks, bathtubs, bathroom wash basins and cloth washers. Blackwater doesn’t have a single definition that is accepted nationwide. It is basically toilet and urinal water, as well as kitchen sinks in most areas.
Intention:
Limit or eliminate potable water (drinking water) use for landscape irrigation.
Limit or eliminate use of natural surface or subsurface water for landscape irrigation.
Implementation:
Consider size, growth rate, adaptability, texture, color, diversification of plant life on site
Find species factor ks, density factor kd, microclimate factor km to calculate…
Landscape Coefficient LK indicates water lost thru evapotranspiration
Use high efficiency micro-irrigation system
drip, micro misters, subsurface irrigation
Instead of using potable water use:
captured rainwater
recycled wastewater
treated water
Use treated water conveyed by public agency as specifically for non-potable uses

4. WE 1.1: 1 Credit Water Efficient Landscaping – 50% Reduction
Codes/Standards Applied:
None
Extra Credit:
none
Submittal Phase:
Design
Perform soil/climate analysis
Ref Guide: Reduce potable water consumption for irrigation 50% from calculated mid-summer (July) baseline
Specify high-efficiency irrigation equipment where irrigation is required
Links from Reference Guide:
Graywater Systems, Compost Toilets, & Rain Collection
The Irrigation Association
Texas Evapotranspiration Association
Texas Water Development Board Web Site
Water Wiser: The Water Efficiency Clearinghouse

5. WE Credit 1.2 Water Efficient Landscaping – No Potable Water or No Irrigation

6. WE 1.2: 1 Credit Water Efficient Landscaping – No Potable Water or No Irrigation
Intention:
Eliminate potable water (drinking water) use for landscape irrigation.
Eliminate use of natural surface or subsurface water for landscape irrigation.
Implementation:
Option 1: do not use any potable water
Option 2: do not use any irrigation system
For landscaping, use following methods:
Plant species factor: select native or adapted plants requiring low/no irrigation
Captured rainwater
Recycled wastewater (treated)
Recycled graywater
Treated water (treated and conveyed by a public agency for non-potable use)
Minimize site area by:
limiting turf areas
using landscaping that doesn’t require permanent irrigation systems
temporary irrigation ok (for plant establishment) if removed after 1 year of installation
Maintain plant health by mulching , alternative mowing, composting

7. WE 1.2: 1 Credit Water Efficient Landscaping – No Potable Water or No Irrigation
Codes/Standards Applied:
None
Extra Credit:
Submittal Phase:
Design
Links from Reference Guide:
Graywater Systems, Compost Toilets, & Rain Collection
The Irrigation Association
Texas Evapotranspiration Association
Texas Water Development Board Web Site
Water Wiser: The Water Efficiency Clearinghouse

8. WE Credit 2 Innovative Wastewater Technologies

9. WE 2: 1 Credit Innovative Wastewater Technologies
Intention:
Reduce wastewater generation
Reduce potable water demand
Increase the recharge of local aquifers
Implementation:
Treatment system cycle: transport –> store –> treat –> dispose
Option 1: Reduce potable water use by 50%
use water conserving fixtures
reuse non-potable water for flushing
reuse on-site treated water
Option 2: Treat and reuse 50% of wastewater on-site (to tertiary standards)
treated water must be treated by:
biological systems (packaged biological nutrient removal systems)
constructed wetlands
high efficiency filtration system

10. WE 2: 1 Credit Innovative Wastewater Technologies
Implementation, continued:
Option 1:
For calculations, input values…
Occupants: students, customers, visitors, FTE
Number of workdays
Male to Female water usage ratio: 1 to 1
male:
water closet = 1 use/day
urinal = 2 use/day
female:
water closet = 3 use/day
Fixture flowrates see ref guide for gallons per flush
Compare baseline case versus design case annual water use in gallons
Calculate percent reduction in water use for design case
Note: refer to Reference Guide for extensive explanation and examples

11. WE 2: 1 Credit Innovative Wastewater Technologies
Codes/Standards Applied:
none
Extra Credit:
Reduce (option 1) or Treat (option 2) 100% (instead of 50%) of potable or wastewater, respectively
Submittal Phase:
design
Links from Reference Guide:
Constructed Wetlands for Wastewater Treatment and Wildlife Habitat: 17 Case Studies

12. WE Credit 3.1 Water Use Reduction - 20% Reduction

13. WE 3.1: 1 Credit Water Use Reduction – 20% Reduction
Credits WE 3.1 & WE 3.2 are the same except for the percent (%) reduction. If one completes the requirements and implementation for WE Water Use Reduction - 30%, they would also receive a point for WE 3.1. Thus, earning two points toward LEED accreditation for the project. The posts for WE 3.1 and WE 3.2 are exactly the same except for the percent reduction.
Intention:
Maximize water efficiency
Reduce burden on municipal water supply
Reduce burden on wastewater system
Note: there is overlap between this credit and WEc2, which focuses on reducing wastewater volume. WEc2 Option 1 uses flow-reducing fixtures and similar calculations.

14. WE 3.1: 1 Credit Water Use Reduction – 20% Reduction
Implementation:
Method: Use special fixtures and sensor/metering controls.
Fixture/flowrate in Gallons Per Minute [GPM] OR Gallons per Flush [GPF]
Shower (lowflow/1.8)
Lavatory (lowflow/1.8) (ultra lowflow/0.5)
Kitchen Sink (lowflow/1.8)
Faucets 2.5
Aerator 2.5
Water Closet (lowflow/1.1)
Dual Flush Water Closet 1.6 (lowflow/0.8)
Composting Toilet 0.0
Urinal 1 (lowflow/0.5)
Non-Water Urinal 0.0

15. WE 3.1: 1 Credit Water Use Reduction – 20% Reduction
For calculations, consider:
DO NOT include irrigation water
Only applicable for the following fixtures:
water closets
urinals
lavatory faucets
showers
kitchen sinks
Daily Residential Usages:
1 person 5 uses per day of flush and flow fixtures
Also use high-efficiency fixtures above, dry fixtures, occupant sensors.
Consider reusing stormwater and graywater for non-potable uses.

16. WE 3.1: 1 Credit Water Use Reduction – 20% Reduction
Codes/Standards Applied:
Energy Policy Act 1992 (different from the EPA)
Extra Credit:
For both WE3.1 & WE3.2: 40% (instead of 20% or 30%) reduction of water usage OR
Process and non-regulated water use savings is at least 10%
Submittal Phase:
design
Links from Reference Guide:
Composting Toilet Reviews
Terry Love’s Consumer Toilet Reports
Water Efficiency Manual for Commercial, Industrial, and Institutional Facilities
Water Measurement Manual: A Water Resources Technical Publication
Water Wiser: The Water Efficiency Clearinghouse

17. WE Credit 3.2 Water Use Reduction - 30% Reduction

18. WE 3.2: 1 Credit Water Use Reduction – 30% Reduction
Credits WE 3.1 & WE 3.2 are the same except for the percent (%) reduction.
Intention:
Maximize water efficiency
Reduce burden on municipal water supply
Reduce burden on wastewater system
Implementation:
Method: Use special fixtures and sensor/metering controls.
Fixture/flowrate in Gallons Per Minute [GPM] OR Gallons per Flush [GPF]
Shower (lowflow/1.8)
Lavatory (lowflow/1.8) (ultra lowflow/0.5)
Kitchen Sink (lowflow/1.8)
Faucets 2.5
Aerator 2.5
Water Closet (lowflow/1.1)
Dual Flush Water Closet 1.6 (lowflow/0.8)
Composting Toilet 0.0
Urinal 1 (lowflow/0.5)
Non-Water Urinal 0.0

19. WE 3.2: 1 Credit Water Use Reduction – 30% Reduction
For calculations, consider:
DO NOT include irrigation water
Only applicable for the following fixtures:
water closets
urinals
lavatory faucets
showers
kitchen sinks
Daily Residential Usages:
1 person 5 uses per day of flush and flow fixtures
Also use high-efficiency fixtures above, dry fixtures, occupant sensors.
Consider reusing stormwater and graywater for non-potable uses.

20. WE 3.2: 1 Credit Water Use Reduction – 30% Reduction
Codes/Standards Applied:
Energy Policy Act 1992 (different from the EPA)
Extra Credit:
For both WE3.1 & WE3.2: 40% (instead of 20% or 30%) reduction of water usage OR
Process and non-regulated water use savings is at least 10%
Submittal Phase:
design
Links from Reference Guide:
Composting Toilet Reviews
Terry Love’s Consumer Toilet Reports
Water Efficiency Manual for Commercial, Industrial, and Institutional Facilities
Water Measurement Manual: A Water Resources Technical Publication
Water Wiser: The Water Efficiency Clearinghouse

21. LEED NC Water Efficiency 5 points Slide Editor: James A
LEED NC Water Efficiency 5 points Slide Editor: James A. Strapko LEED Source: