The drainage fee for residential developed property shall be the ERU rate multiplied by the number of individual dwelling units existing on the property. In the event of a newly constructed dwelling unit, the charge for the drainage fee attributable to that dwelling unit shall commence upon the issuance of the certificate of occupancy for that dwelling unit or final inspection by the Division of Building Inspection or the commencement of water service, or in the event construction has been halted, then on the date the Director or Director’s designee determines in his reasonable judgment that the impervious area of such development is substantially established. (Ord. 19496 § 122, 12-21-10; Ord. 17059 § 18(B), 12-17-96. Code 1995 § 146-397. Formerly 14.85.070.)