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1502.8.2 Commercial, Industrial, and Institutional Occupancies
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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
(Equation 15.1)
Occupants X lavatory flow rate X 3
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:
(Equation 15.2)
Number of daily uses X shower flow rate X 5
minutes
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.
(Equation 15.3)
Cubic feet of capacity X Water Factor X 6 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.
Related Code Sections
1502.8.2 Alternate Water Sources for Nonpotable Applications, Commercial, Industrial, and Institutional Occupancies
lavatories may be determined by the following equation:
(Equation 15.1)
Occupants X lavatory flow rate X 3
Where:
The number ...
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