Orange County NC Website
Browse       Search
Article 6: Development StandgrV4 <br /> Section 6.15:Soil Erosion and Sedimentation Contro1268F <br /> (3) Permissible Velocities <br /> TABLE 6.15.8.C.3: MAXIMUM PERMISSIBLE VELOCITIES <br /> MATERIAL FPS Mps <br /> Fine Sand(noncolloidal) 2.5 0.8 <br /> Sandy Loam(noncolloidal) 2.5 0.8 <br /> Silt Loam(noncolloidal) 3.0 0.9 <br /> Ordinary Firm Loam 3.5 1.1 <br /> Fine Gravel 5.0 1.5 <br /> Stiff Clay(very colloidal) 5.0 1.5 <br /> Graded, Loam to Cobbles(noncolloidal) 5.0 1.5 <br /> Graded,Silt to Cobbles(colloidal) 5.5 1.7 <br /> Alluvial Silts(noncolloidal) 3.5 1.1 <br /> Alluvial Silts(colloidal) 5.0 1.5 <br /> Coarse Gravel (noncolloidal) 6.0 1.8 <br /> Cobbles and Shingles 5.5 1.7 <br /> Shale and Hard Pans 6.0 1.8 <br /> Source:Adapted from recommendations bythe Special Committee on Irrigation Research, <br /> American Society of Civil Engineers,1926,for channels with straight alignment.Forsinuous <br /> channels,multiplyallowable velocity by 0.95for slightlysinuous channels,by0.9 for <br /> moderate) sinuous channels,and b 0.8 for highly sinuous channels. <br /> (4) Exceptions <br /> This rule shall not apply in areas other than the University Lake, Cane Creek, and Upper <br /> Eno Watersheds where it can be demonstrated that stormwater <br /> runoff velocities will not create an erosion problem in the receiving watercourse. <br /> 6.15.9 Responsibility for Installation and Maintenance <br /> (A) On-Site Facilities <br /> (1) During the development of a site, the person engaged in or conducting the land <br /> - <br /> disturbing—ast+vEtyLand-Disturbing Activity shall be responsible for installing and <br /> maintaining all temporary and permanent erosion and sedimentation control <br /> measures and facilities as required by the approved or revised Frosiop Arps' <br /> Erosion and Sedimentation Control Plan, any <br /> provision of this Ordinance, the Act, or any order adopted pursuant to this <br /> Ordinance or the Act. <br /> (2) The responsibility for installing and maintaining permanent erosion and <br /> sedimentation control measures and facilities after completion of the site <br /> development shall lie with the land owner or person in possession or control of <br /> the land except facilities and measures installed within road or street rights-of- <br /> way or easements accepted for maintenance by a government agency. <br /> (I3) Off-Site Facilities <br /> (1) The Erosion Control Officer may allow stormwater runoff that is charged in <br /> volumes or at rates in excess of those otherwise allowed by this Ordinance to be <br /> discharged into drainage facilities off the site of development if the off-site <br /> facilities and the channels leading to them are designed, constructed, and <br /> maintained in accordance with the standards of this Ordinance. <br /> (2) Adequate provision must be made for the sharing of the construction and <br /> maintenance expenses of the facilities. <br /> Orange County, North Carolina— Unified Development Ordinance Page 6-136 <br />