5.4.22 Planning Board Packet - Laserfiche WebLink

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Article 6: Development Standards 116 Section 6.15: Soil Erosion and Sedimentation Control245F SLOPE GRADING STANDARDS SITE AREA MINIMUM SLOPE MAXIMUM SLOPE Pedestrian Plaza Areas 1% 2% Sidewalks 1% 8% (3) No cut or fill slopes of any type may be steeper than 3:1 and must have smooth vertical transitions. Where space limitations demand, terracing with approved retaining walls will be utilized. Where retaining walls are used, they must be constructed of a material compatible with the building architecture. (4) Berms, channels, swales, etc. must be graded in such a way as to be an integral part of the landscape, and paved surfaces must be designed with smooth vertical transitions between changes in slope. (5) In order to minimize soil erosion, practical combinations of the following shall be used: (a) Expose the smallest practical area of cleared land during construction. (b) Temporary ditches, dikes, vegetation, and/or mulching must be used to protect critical areas exposed during development or construction. (c) Sediment control measures must be installed and maintained to remove sediment from run-offstormwater runoff waters during development. (d) Permanent landscaping and groundcover must be installed as soon as practical after construction activities are completed. (e) Temporary groundcover must be used for fill material subject to erosion and on construction projects over six months duration. 6.15.8 Stormwater Outlet Protection (A) Control of Discharge in University Lake, Cane Creek, and Upper Eno Watersheds After development of a site, the peak discharge of stormwater runoff resulting from a 10ten304-year storm shall be no greater than that which would result from a 10ten3o5-year storm on the same site prior to development. This requirement shall apply to the following: (1) Commercial, industrial, office, and institutional developments, (2) Multi-family residential developments of more than ten units, and (3) Single-family detached residential developments where more than three lots are to be created. (B) Control of Velocity (1) Persons shall plan and conduct land disturbiRg +,",+„Land-Disturbing Activity so that the post-construction velocity of the 10-year stormwater runoff in the receiving watercourse to the discharge point does not exceed the greater of: (a) The velocity established by the table in Section 6.15.8(C)(3)of the subsection; or (b) The velocity of the 10-year stormwater runoff in the receiving watercourse prior to development. 304 Text correction—consistent use of"10-year"within this sub-section. 301 Text correction—consistent use of"10-year"within this sub-section. Orange County, North Carolina—Unified Development Ordinance Page 6-133