(A) Where the construction of additional bedrooms, the installation of mechanical equipment, or other factors likely to affect the operation of the system can be reasonably anticipated, the installation of a system for the anticipated need shall be required.
(Prior Code, Ch. 506 § 10.1)
(B) For dwellings, the average daily sewage flow and the measured percolation rate of the soil shall be used to size the soil treatment system. Acceptable methods for estimating sewage flow are given in Table I. The minimum daily sewage flow estimated for any dwelling shall provide for at least 2 bedrooms. For multiple residential units, the estimated daily sewage flow shall consist of the sum of the flows of each individual unit. If a grey water system is employed, estimated sewage flow shall equal 60% of the amount provided in Table I.
(Prior Code, Ch. 506 § 10.2)
(C) For other establishments, average design flow shall be used to size soil treatment systems. Maximum design flow shall be used to size sewage tanks. Design flows shall be calculated using estimated or measured values for other establishments according to the following:
(1) Estimated average and maximum design flows: the best available data as provided by the Department shall be used if estimating the average and maximum design flows.
(2) Measured average and maximum design flows:
(a) The average design flow shall be determined by averaging the measured daily flows for a consecutive 7-day period in which the establishment is at maximum capacity or use; and
(b) The maximum design flow shall be the anticipated peak daily flow.
(Prior Code, Ch. 506 § 10.3)