1. Irrigation: LEED SS 2.5 & WE 2.3
LEED SS WE 2.3 Performance Path
Potential for 14 points (11 with prescriptive)
Calculation similar to COT Water harvesting ordinance water budget calc
Issues:
CIR re: Mulch
CIR re: Sub-base
Need to send a CIR on which ETo to use:
COT ordinance: July inches
EPA Watersense: June inches
Even with the issues It may be something you want to persue…
So we’ll spend just a minute on the details

2. Irrigation: LEED SS 2.5 & WE 2.3
Per tech call on 1/27/10, Marion stated: Can exclude the bare mulch area from the calculator to use the calculator.
Bare much might be landscaped by home owner and defeat the purpose

3. LEED Water Calculator

4. LEED Water Calculator
CF = type of sensor and mfr’s claim for water reduction >30% is a red flag, run by TAG
Low # = red flag
Ks value based on highest value in the zone
Not a list of species, but type and water needs
WE 2.1a
WE 2.2
CF = 1 - % savings, e.g., .70
Also look for credential of person who filled out the calculator

5. Exercise: fill out a checklist
Form into teams
Regional: Fill out Section 4: Water Efficiency only
LEED Fill out Water Efficiency only
15 minutes
How many of you could not make the minimum points required for Regional, LEED?
How many of you though how can I afford this???? Be honest….

6. Rainwater Regional LEED
4.1 Install a rainwater harvesting system (active system)
500 s.f minimum catchment area
Store 10% of annual available rainfall on catchment
Store 25%
Store 50%
LEED
WE 1.1 Rainwater Harvesting System
Storage sized to hold a 1 inch rainfall
For 50% of Roof, or
75% of roof
Indoor use, or
Outdoor use, or
Both
OK lets start back up with Rainwater which is in the regional water section and the LEED site section
Problem with regional actually penalizes larger catchment areas because you must have bigger tank
Another issue is what are you going to do with the water…if you don’t have a use, should you get credit?
NAHB: Rainwater is collected and used
(no metric…use a bucket)
Rainwater is distributed with PV or gravity

7. Rainwater How to check your use: How to check your tank size:
500 sf * 12 inches/year * .62 gals/inch = 3,720
370 gal tank = 10%
1000 sf * 12 inches/year * .62 gals/inch = 7,440
need a 744 gallon tank to get any credit
LEED: sf *.62 gals/inch = 620 gallon tank
How to check your use:
How to check your tank size:
By the way 3,700 gals is a lot of water…
Interesting rule of thumb using this calculator
Roof area = landscape area, and tank sized for 10% is all you need

8. Greywater Regional LEED
4.3 Install separate greywater and sanitary lines stubbed out
Soon to be COT ordinance
4.4 Use of Greywater
Supply line to each toilet
Connect to irrigation
Connect to toilet
LEED
WE 1.2 Graywater Reuse System
Tank or dosing basin (CIR)
Must be collected from at least:
Clothes washer
Showers
Some combination of faucets, etc > 5,000 gallons per year
Don’t have to use it!
The major issue here is are you in the greywater with an E camp or graywater with an A camp; one word or two
NAHB: Gray Water is separated and reused for:
Water closets, or
Landscaping (not both)

9. Hotwater Distribution
Regional
4.5 Central-core system
All fixtures within 5 feet of water heater
LEED
EA 7.1 Hot Water Distribution
C) compact design of conventional system
Branch lines <20 feet
Add 1x ceiling height for 2-story home
Moving to indoor water use
More CIRs on Hotwater distribution than any other topic!!!!!
NAHB: (1) Piping <40 feet; or (2) < 30 feet, or
(3) c: central core system such that the volume of water in each pipe run between the water heater and fixture < 6 cups

10. Hotwater Distribution
Regional
4.6 Manifold system
“Home-run” system
Located within 10 feet of circulation loop (?)
Branch lines <= ½ inch
LEED
EA 7.1 Hot Water Distribution
b) Central Manifold system
Manifold < 6 feet
Insulate manifold to R4
Branch line <20 feet
Add 1x ceiling height for 2-story home
Branch lines <= ½ inch
Regional System combined two system designs….
NAHB: (3) b: Engineered parallel piping system (i.e., manifold)
Distance from water heater to parallel piping system < 15 feet
Parallel piping to the fixture contains < 8 cups

11. Hotwater Distribution
Regional
4.7 Install a manual or motion activated circulation pumping system
LEED
EA 7.1 Hot Water Distribution
Structured Plumbing system
Insulate loop to R4
Loop Length < 40 feet
Branch line <10 feet
Push button in each bath and kitchen
Auto pump shut-off
Moving to indoor water use
NAHB: (3) a: Structured-type demand controlled loop
Volume of water in pipe and fixture down stream of recirc trunk is a maximum of 4 cups

12. Hot Water Equipement Regional
4.8 Tankless Hot Water Heater
Cold Water or Solar input
For any fixture > 20 feet of pipe run from water heater
LEED
Prescriptive energy path only
EA 7.3 Efficient Hot Water Equip
Gas Water Heaters
Tankless with EF >=0.8
Electric water heaters
Tankless with EF >=0.99
Who knows or can guess how much energy a tankless saves over a tank?
Frequent liturature says 25%...where did that come from?
Solar water heating is in the Energy Sections
NAHB: (4) Pipe runs > 40 feet from water heater, install tankless point of use

13. Performance Comparison Of Residential Hot Water Systems Prepared by NAHB Research Center for NREL, 2002
Average hot water consumption in US is between 45 and 66 gallons per day
Low use = 15 to 41 gpd.
High use = 66 to 86 gpd
These are the boundaries of potential savings E
Ric Hicks point, after the cost of upgrading your electrical or gas service for the demand, your better off going solar….

14. Water Fixtures Regional LEED 4.9 Lav Faucetts Watersense or ≤ 1.5 gpm
4.10 Showerheads meet EPA Watersense or ≤1.5 gpm at 80 psi
4.11 Water efficient toilets
High efficiency ≤ 1.28 gpm,or
Watersense (≤1.3 gpm), or
Composting Toilet
LEED
WE 3.1 High Efficiency Fixtures
Faucets ≤ 2.0 gpm
Showers ≤ 2.0 gpm per stall
Toilets average for all ≤ 1.3 gpm, or dual flush, or Watersense
WE 3.2 Very High Efficiency
Faucets ≤ 1.5 gpm
Showers ≤ gpm per stall
Toilets average for all ≤ 1.1 gpm
Dual flush formula:
(1 high + 2 low)/3 ≤ 1.1 gpm
What do you notice about this Watersense ultra low flow shower head?
Looks like the rain type head…Watersense includes a perception component…how does is feel?
At the time the regional system was designed the Watersense draft criteria for toilets was 1.28 gpm
Composting toilet gets the most points: one point for HET, 2 points for composting
LEED: Per Stall
Remember my comments about comparing apples oranges and grapes?
NAHB more points for the more efficient shower
NAHB 6 points for HET, 8 points for composting
NAHB: Faucets: ≤ psi
801.4 Shower Heads: ≤ 2.5 gpm or, ≤ 2 gpm
801.6 Water closets: ≤ 1.28 gpm & Watersense; Urninal: ≤0.5
802.2 Composting or waterless toilets and urinals

15. Submittals
Submittal for a high efficiency toilet and a very high efficiency lav faucet

16. Mini Quiz What is the criteria for a very high efficiency lav?
1.5 gpm
What was the flow rate of the submitted lav?
2.2 gpm
How did they earn the credit…did the verifier screw up?
The lav on the previous page achieved the very high efficiency credit

17. The Aerator
Plus the gpm is etched into the aerator and you can verify in the field…

18. Appliances Regional LEED 4.15 No swimming pool 4.16 No fountains
4.12 Washing machine water factor ≤ 6.0
4.13 Refrige with in-door filtered water
4.14 Excess flow check valves at fixtures
Max 2.5 gpm with auto shut off
4.15 No swimming pool
4.16 No fountains
4.17 No garbage disposer
LEED
Prescriptive energy path only
EA 9 Energy Star Appliances, includes:
Clothes washer
NAHB…you have to install at least one disposer to get credit…maybe two would be better
NAHB: Washing machine water factor ≤ 6.0
801.3 Food Waste disposers: A min of 1 food waste dispose is installed at the primary kitchen sink

19. Next Week Session 3: Energy and Envelope
Performance vs. prescriptive path
Orientation and passive solar…how to save $ for no upfront cost
HERS Rating
Advanced Framing
Insulation
Windows