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// CODE SNIPPET

1503.8 Procedure for Estimating Gray Water Discharge

California Plumbing Code 2019 > 15 Alternate Water Sources for Nonpotable Applications > 1503.0 Gray Water Systems [BSC-CG] > 1503.8 Procedure for Estimating Gray Water Discharge
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Gray water systems shall be designed to distribute the total amount of estimated gray water on a daily basis. The water discharge for gray water systems shall be determined in accordance with Section 1503.8.1 or Section 1503.8.2.

Exception: It is not the intent of this section to require that all gray water must be handled by an irrigation field or disposal field. It is acceptable for excess gray water to be diverted to the building sewer through a diverter valve or overflow drain as permitted in this chapter.

1503.8.1 Residential Occupancies

The gray water discharge for residential occupancies shall be calculated by water use records, calculations of local daily per person interior water use, or the following procedure:

(1) The number of occupants of each dwelling unit shall be calculated as follows:
First Bedroom
2 occupants
Each additional bedroom
1 occupant
(2) The estimated gray water flows of each occupant shall be calculated as follows:
Showers, bathtubs, and lavatories
25 gallons (95 L) per day/occupant
Laundry
15 gallons (57 L) per day/occupant
(3) The total number of occupants shall be multiplied by the applicable estimated gray water discharge as provided above and the type of fixtures connected to the gray water system.

1503.8.2 Commercial, Industrial, and Lnstitutional Occupancies

The Authority Having Jurisdiction may utilize the gray water discharge procedures listed below, water use records or other documentation to estimate gray water discharge.

1503.8.2.1 Lavatories

Daily discharge from lavatories may be determined by the following equation:

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

1503.8.2.2 Showers

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)

1503.8.2.3 Commercial Clothes Washers

Daily gray water discharge from commercial clothes washers may be determined by the following equation:

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.

1503.8.3 Daily Discharge

Gray water systems using tanks shall be designed to minimize the amount of time gray water is held in the tank and shall be sized to distribute the total amount of estimated gray water on a daily basis.

Exception: Approved on-site treated nonpotable gray water systems.

Related Code Sections


1502.8 Alternate Water Sources for Nonpotable Applications, Procedure for Estimating Gray Water Discharge
Gray water systems shall be designed to distribute the total amount of estimated gray water on a daily basis. The water discharge for gray water ...
California Plumbing Code 2016 > 15 Alternate Water Sources for Nonpotable Applications > 1502.0 Gray Water Systems [BSC-CG] > 1502.8 Procedure for Estimating Gray Water Discharge
1503.8 Alternate Water Sources for Nonpotable Applications, Procedure for Estimating Gray Water Discharge
procedures listed below, water use records or other documentation to estimate gray water discharge ...
California Plumbing Code 2019 > 15 Alternate Water Sources for Nonpotable Applications > 1503.0 Gray Water Systems [BSC-CG] > 1503.8 Procedure for Estimating Gray Water Discharge
1503.8.2 Alternate Water Sources for Nonpotable Applications, Commercial, Industrial, and Lnstitutional Occupancies
The Authority Having Jurisdiction may utilize the gray water discharge procedures listed below, water use records or other documentation ...
California Plumbing Code 2019 > 15 Alternate Water Sources for Nonpotable Applications > 1503.0 Gray Water Systems [BSC-CG] > 1503.8 Procedure for Estimating Gray Water Discharge > 1503.8.2 Commercial, Industrial, and Lnstitutional Occupancies
1502.8.2.2 Alternate Water Sources for Nonpotable Applications, Showers
Daily gray water discharge from showers may be determined by the following equation: (Equation 15.2) Number of daily uses X shower ...
California Plumbing Code 2016 > 15 Alternate Water Sources for Nonpotable Applications > 1502.0 Gray Water Systems [BSC-CG] > 1502.8 Procedure for Estimating Gray Water Discharge > 1502.8.2 Commercial, Industrial, and Institutional Occupancies > 1502.8.2.2 Showers
1503.8.2.2 Alternate Water Sources for Nonpotable Applications, Showers
Daily gray water discharge from showers may be determined by the following equation: Number of daily uses X shower flow rate X 5 ...
California Plumbing Code 2019 > 15 Alternate Water Sources for Nonpotable Applications > 1503.0 Gray Water Systems [BSC-CG] > 1503.8 Procedure for Estimating Gray Water Discharge > 1503.8.2 Commercial, Industrial, and Lnstitutional Occupancies > 1503.8.2.2 Showers
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