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The system shall be sized in accordance with the gallons-per-day-per-occupant number based on the type of fixtures connected to the gray water system. The discharge shall be calculated by the following equation:
C = A × B(Equation 30-1)
where:
A=Number of occupants:
Number of occupants shall be determined by the actual number of occupants, but not less than two occupants for one bedroom and one occupant for each additional bedroom.
B=Estimated flow demands for each occupant:
Residential—25 gallons per day (94.6 lpd) per occupant for showers, bathtubs and lavatories and 15 gallons per day (56.7 lpd) per occupant for clothes washers or laundry trays.
C=Estimated gray water discharge based on the total number of occupants.

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P3009.14.6 Sanitary Drainage, Estimating Gray Water Discharge
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