1. Charges for operation, maintenance, replacement and capital charges shall consider, among other factors, for the actual usage of all classes of users.

    2. Calculated unit-allocated charges which shall be deposited in the capital costs fund shall be such as will provide adequate revenues for the debt service requirement of capital costs.  These funds are not interchangeable.  Revenue collected from the operation, maintenance and replacement portion of the charges shall not be used to offset any portion of the capital costs, nor shall any revenue collected from the capital costs portion of the charges be used to offset any portion of the operation, maintenance and replacement costs.

    3. Charges to all classes of users shall be established by ordinance, with ordinance rates adjusted periodically to reflect changes in costs.