Where the city engineer waives all or part of the minimum storm water management requirements, or where the waiver is based on the provision of adequate storm water facilities provided downstream of the proposed development, the applicant may be required to pay a fee in an amount as determined by the city engineer. This fee shall be established as part of the city fee schedule and shall be based on the cubic feet of storage required for storm water management relative to the development in question. All fees shall be paid by the developer to the city prior to the issuance of any building permit. [Code 2000 § 9-3a-9].