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// CODE SNIPPET

708.14.1 Estimating Gray Water Discharge

Green Construction Code 2012 > 7 Water Resource Conservation, Quality and Efficiency > 708 Gray Water Systems > 708.14 Subsurface Gray Water Irrigation Systems > 708.14.1 Estimating Gray Water Discharge
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The irrigation 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) - D(Equation 7-1)
where:
A=Number of occupants:

Residential—For dwelling units regulated by this code in accordance with Section 101.3, the 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.

Commercial—Number of occupants for buildings without dwelling units shall be determined by the International Building Code.

B=Estimated flow demands for each occupant:

Residential— For dwelling units regulated by this code in accordance with Section 101.2, 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.

Commercial—For buildings, without dwelling units, based on type of fixture or water use records minus the discharge of fixtures other than those discharging gray water.

C=Estimated gallons (L) of gray water discharge based on the total number of occupants.
D=Estimated gallons (L) of gray water to be used within the interior of the building.

Related Code Sections


708.14.1 Water Resource Conservation, Quality and Efficiency, Estimating Gray Water Discharge
C = Estimated gallons (L) of gray water discharge based on the total number of occupants. D = Estimated gallons (L) of gray ...
Green Construction Code 2012 > 7 Water Resource Conservation, Quality and Efficiency > 708 Gray Water Systems > 708.14 Subsurface Gray Water Irrigation Systems > 708.14.1 Estimating Gray Water Discharge
1303.6 Gray Water Recycling Systems, Estimating Gray Water Discharge
other than those discharging gray water. C = Estimated gray water discharge based on the total number of occupants ...
Plumbing Code 2012 > 13 Gray Water Recycling Systems > 1303 Subsurface Landscape Irrigation Systems > 1303.6 Estimating Gray Water Discharge
P3009.14.6 Sanitary Drainage, Estimating Gray Water Discharge
, bathtubs and lavatories and 15 gallons per day (56.7 lpd) per occupant for clothes washers or laundry trays. C = Estimated gray water ...
Residential Code 2012 > 30 Sanitary Drainage > P3009 Gray Water Recycling Systems > P3009.14 Landscape Irrigation Systems > P3009.14.6 Estimating Gray Water Discharge
1403.1.1 Subsurface Landscape Irrigation Systems, Absorption Area
The total absorption area required shall be computed from the estimated daily gray water discharge and the design-loading rate based ...
Plumbing Code 2015 > 14 Subsurface Landscape Irrigation Systems > 1403 Installation > 1403.1 Installation > 1403.1.1 Absorption Area
P3009.10.1 Sanitary Drainage, Absorption Area
The total absorption area required shall be computed from the estimated daily gray- water discharge and the design-loading rate based ...
Residential Code 2018 > 30 Sanitary Drainage > P3009 Subsurface Landscape Irrigation Systems > P3009.10 Installation > P3009.10.1 Absorption Area
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