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# 1503.8.2 Commercial, Industrial, and Lnstitutional 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

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

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.### Related Code Sections

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