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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.
The gray water discharge for single family and multi-family dwellings shall be calculated by water use records, calculations of local daily per person interior water use, or the following procedure:
- The number of occupants of each dwelling unit shall be calculated as follows:
First Bedroom 2 occupants Each additional bedroom 1 occupant - 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 (57L) per day/occupant - 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.
The gray water discharge for commercial, industrial, and institutional occupancies shall be calculated by utilizing the procedure in Section 1503.8.1, water use records or other documentation to estimate gray water discharge.
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