Secondary and Cumulative Impacts Master Management Plan - 2014

Article 11 Environmental Standards 11-22 Activities Allowed Within Buffers

(2) diffuse the flow of stormwater runoff, encourage sheet flow and avoid concentrated discharge of stormwater into surface waters; (3) maximize the use of Best Management Practices (BMPs) to minimize adverse water quality impacts; and (4) comply with all applicable standards and conditions of subsection 11-22-2. 11-22-2 Activities Allowed within Buffers Only the activities listed below are allowed within required water supply watershed buffer areas: (A) Archeological activities, provided any vegetation removed is restored with vegetation of a comparable assimilative capacity (B) Bridges, provided no alternative to their location in the buffer exists (C) Dam maintenance activities (D) Drainage ditches, roadside ditches, and stormwater outfalls, provided: (1) no alternative to their location in the buffer exists; and (2) a stormwater management facility is installed to control nitrogen and attenuate flow before the conveyance discharges through the buffer (E) Drainage of a pond, provided a new vegetated water supply watershed buffer meeting the purpose and requirements of this section is established along the new drainageway (F) Driveway crossings that access single-family dwellings, provided: (1) no alternative to their location in the buffer (including opportunity for shared driveways) exists; (2) buffer disturbance is no more than 60 feet wide; (3) buffer disturbance is no more than 6,000 square feet in area (this area of disturbance may occur on “both” sides of the buffer); (4) the driveway crosses the buffer at an angle as close to 90 degrees as possible (and not less than 60 degrees); (5) side slopes do not exceed a 2:1 (horizontal to vertical) ratio (bridging and/or retaining walls may be used to meet this and the disturbance width standard); and (6) all culverts are designed and constructed for the 25-year storm event or as otherwise required by the Department of Environmental Services.

Wake County Unified Development Code 11-5