Except as otherwise provided in Section 811.0120(c), whenever a building permit, grading permit, or other City approval in connection with new construction is requested within the boundaries of a Drainage Plan, the specified drainage fee may be paid on the date of issuance of the building permit, grading permit, or other City approval in connection with new construction, and shall become due and payable at the time of final inspection, or the issuance of the certificate of occupancy, whichever occurs first. If the drainage fee is paid in full on the date of issuance of the building permit, the amount of the drainage fee shall be that which is in effect in the Schedule of Fees for the applicable drainage Plan on the date of payment of such fee. If the drainage fee is not fully paid on the date of issuance of the building permit, the fee, or applicable portion thereof, shall be secured by the recordation of a Deferral Agreement. The amount of the drainage fee secured by the Deferral Agreement shall be that which is in effect in the Schedule of Fees for the applicable drainage plan at the time the fee becomes due and payable, and shall be paid on that date. The drainage fee shall be deposited to the appropriate Drainage Facilities Fund. Any interest income earned by the money in the Drainage Facilities Fund shall also be deposited in the fund.