A = Number of occupants:
Residential - 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 shall be determined by the International Building Code.
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.
Commercial - Based on type of fixture or water use records minus the discharge of fixtures other than those discharging gray water.
C = Estimated gray water discharge based on the total number of occupants.
|ELEMENT||MINIMUM HORIZONTAL DISTANCE|
|Storage tank (feet)||Irrigation disposal field (feet)|
|Lot line adjoining private property||5||5|
|Streams and lakes||50||50|
|Public water main||10||10|
(minutes per inch)
|DESIGN LOADING FACTOR
(gallons per square foot per day)
|0 to less than 1 0||1.2|
|10 to less than 30||0.8|
|30 to less than 45||0.72|
|45 to 60||0.4|
|Polyethylene (PE) plastic pipe||ASTMF405|
|Polyvinyl chloride (PVC) plastic pipe||ASTMD2729|
|Polyvinyl chloride (PVC) plastic pipe with a 3.5-inch O.D. and solid cellular core or composite wall||ASTMF1488|