No person, firm, corporation or governmental agency shall commence any land disturbing activity regulated by this chapter on any undeveloped or vacant lot or parcel of land without first obtaining a stormwater permit from the city. A permit shall be issued if the proposed development meets the requirements of this chapter. A stormwater permit is required for any development which:
(A) Is located in a floodplain; or
(B) Is located in a floodprone area with 100 acres of tributary drainage area or more; or
(C) Is located in a depressional storage area with a storage volume of 0.75 acre-feet or more for the base flood; or
(D) Creates a wetland impact within an area defined as waters of the United States; or
(E) Modifies the flood-prone area of a channel where the tributary drainage area is 20 or more acres; or
(F) (1) Includes the total land area of an ownership parcel, that results in:
(a) More than one acre of new impervious surface area; or
(b) More than two acres of hydrologically disturbed area, unless the total new impervious surface area is less than 0.25 acre; or
(c) An impervious surface area ratio of 40% or greater, unless the total new impervious surface area is less than 0.25 acre; or
(d) Increase in runoff volume is more than one cfs.
(2) The term “new” in this division (F) refers to impervious surface area created after the original effective date of this chapter. Redevelopment of previously developed sites shall maintain existing storage volume and shall not increase the rate of runoff from the site. The applicant shall provide supporting data and calculations to the satisfaction of the SWMD to ensure the site design either provides a watershed benefit or meets the requirements of NPDES General Permit for Storm Water Discharges From Large and Small Construction Activities, SCR100000, and Standards for Stormwater Management and Sediment Reduction Regulation §§ 72-300 thru 72-316; or
(G) Any public road development resulting in one acres or more of additional impervious surface per mile, for linear or nonlinear projects; or
(H) Any development which hydrologically disturbs 5,000 square feet or more. This development activity shall at a minimum meet the soil erosion and sediment control performance standards set forth by this chapter and SCDHEC’s Stormwater BMP Manual.
(Ord. 2008-06, passed 4-14-08) Penalty, see § 52.999