A5.303.2.3.4 Nonpotable Water Systems for Indoor Use
Utilizing nonpotable water systems (such as captured rainwater, treated graywater and recycled water) intended to supply water closets, urinals, and other allowed uses, may be used in the calculations demonstrating the 12-, 20- or 25-percent reduction. The nonpotable water systems shall comply with the current edition of the California Plumbing Code.
WATER USE BASELINE3
|FIXTURE TYPE||BASELINE FLOW RATE||DURATION||DAILY USES||OCCUPANTS2|
|Showerheads||2.0 gpm @ 80 psi||5 min.||1||X2a|
|Lavatory faucets nonresidential||0.5 gpm @ 60 psi||.25 min.||3||X|
|Kitchen faucets||1.8 gpm @ 60 psi||4 min.||1||X2b|
|Replacement aerators||2 gpm @ 60 psi||X|
|Wash fountains||1.8 gpm/20 [rim space (in.) @ 60 psi]||X|
|Metering faucets||0.20 gallons/cycle||.25 min.||3||X|
|Metering faucets for wash fountains||0.20 gallons/cycle/20 [rim space (in.) @ 60 psi]||.25 min.||1 male1 3 female||X|
|Gravity tank type water closets||1.28 gallons/flush||1 flush||1 male1 3 female||X|
|Flushometer tank water closets||1.28 gallons/flush||1 flush||1 male1 3 female||X|
|Flushometer valve water closets||1.28 gallons/flush||1 flush||1 male1 3 female||X|
|Electromechanical hydraulic water closets||1.28 gallons/flush||1 flush||1 male1 3 female||X|
|Urinals||0.5 or 0.1254 gallons/flush||1 flush||2 male||X|
- The daily use number shall be increased to three if urinals are not installed in the room.
- Shower use by occupants depends on the type of use of a building or portion of a building, e.g., total occupant load for a health club, but only a fraction of the occupants in an office building as determined by the anticipated number of users.
- Kitchen faucet use is determined by the occupant load of the area served by the fixture.
- Use worksheet WS-1 to calculate baseline water use.
- Floor-mounted urinals @ 0.5 GPF or wall-mounted urinals @ 0.125 GPF.