The aforesaid fees and the following schedule of rates, fees, tolls and charges for the sewer facilities and services furnished by or through, or for the use of the sewer system, are found and declared to be reasonable and just, taking into account and consideration the value of the system and the cost of maintaining and operating the system, and the proper and necessary allowances for the depreciation thereof in the amounts necessary for the retirement of all bonds and other securities payable from the revenues of the system, the accruing interest on all bonds and reserves therefor. (Ord. 177 § 2, 1976)