There is created a special fund to be known and designated as the "parking fund" into which shall be deposited all receipts from special assessments related to parking, receipts derived from the operation of parking meters and parking areas under the city's control, and fines and forfeitures for parking offenses. This fund shall be used only for the payment and the expenses of the city in enforcing its ordinances relating to parking, including the costs of signing and marking, all employee costs, overhead, costs of prosecution, court costs, and every other cost incidental to the proper maintenance and enforcement of this ordinance by the city. Funds derived from areas from special parking assessments shall be used only for costs associated with the area benefitted by the special assessment.