The Authority Having Jurisdiction may utilize the gray water discharge procedures listed below, water use records or other documentation to estimate gray water discharge.
Daily discharge from lavatories may be determined by the following equation:
Where:
The number of occupants = square footage of the building divided by the occupant load factor from the California Plumbing Code Chapter 4, Table A.
Lavatory fixture flow rate, new construction = That from the California Green Building Standards (CALGreen) Code Section 5.303.2.3
Lavatory fixture flow rate, existing fixtures= Actual flow rate for existing fixtures
3 = Average number of uses per person per day
Occupants X lavatory flow rate X 3
(Equation 15.1)
Where:
The number of occupants = square footage of the building divided by the occupant load factor from the California Plumbing Code Chapter 4, Table A.
Lavatory fixture flow rate, new construction = That from the California Green Building Standards (CALGreen) Code Section 5.303.2.3
Lavatory fixture flow rate, existing fixtures= Actual flow rate for existing fixtures
3 = Average number of uses per person per day
Daily gray water discharge from showers may be determined by the following equation:
Number of daily uses X shower flow rate X 5 minutes
(Equation 15.2)
Daily gray water discharge from commercial clothes washers may be determined by the following equation:
Where:
Water Factor= Gallons per cubic foot
6 = Average number of uses per day
Note: Cubic feet of capacity and Water Factor are contained in product specifications or are available from the washer manufacturer.
Cubic feet of capacity X Water Factor X 6
(Equation 15.3)
Where:
Water Factor= Gallons per cubic foot
6 = Average number of uses per day
Note: Cubic feet of capacity and Water Factor are contained in product specifications or are available from the washer manufacturer.