Tenn. Code Ann. § 68-221-1101

The purpose of this part is to facilitate compliance with the Water Quality Act of 1977, by municipalities which are affected by environmental protection agency (EPA) storm water regulations, particularly those arising from § 405 of the Water Quality Act of 1987, and § 402(p) of the Clean Water Act of 1977, regulating storm water discharges to protect water quality. This part shall enable municipalities to regulate such discharges, to establish a system of drainage facilities, and to fix and require payment of fees for the privilege of discharging storm water. This part shall also enable municipalities to construct and operate a system of drainage facilities for storm water management and flood control.