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AG 1997 08 12
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AG 1997 08 12
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Last modified
3/25/2002 6:30:00 PM
Creation date
11/27/2017 11:54:14 AM
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Meeting Minutes
Doc Type
Agenda
Meeting Minutes - Date
8/12/1997
Board
Board of Commissioners
Meeting Type
Regular
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constructed to withstand the expected velocity anywhere the velocity exceeds <br />the "prior to development" velocity by 10%. <br /> <br />Acceptable Management Measures - measures applied alone or in <br />combination to satisfy the intent of this section are acceptable if <br />there are no objectionable secondary consequences. The NCSCC <br />recognizes that the management of stormwater runoff to minimize <br />or control downstream channel and bank erosion is a developing <br />technology. Innovative techniques and ideas will be considered <br />and may be used when shown to have the potential to produce <br />successful results. Some alternatives are to: <br /> <br />Avoid increases in surface runoff volume and velocity by <br />including measures to promote infiltration to compensate <br />for increased runoff from areas rendered impervious. <br /> <br />Avoid increases in stormwater discharge velocities by using <br />vegetated or roughened swales and waterways in lieu of <br />closed drains and high velocity paved sections. <br /> <br />o <br /> <br />Provide energy dissipaters at outlets of storm drainage <br />facilities to reduce flow velocities to the point of discharge. <br />These may range from simple rip-rapped sections to <br />complex structures. <br /> <br />Protect watercourses subject to accelerated erosion by <br />improving cross sections and/or providing erosion-resistant <br />lining. <br /> <br />Exceptions - this rule shall not apply where it can be demonstrated <br />that stormwater discharge velocities will not create an erosion <br />problem in the receiving watercourse. <br /> <br />The following is a table for maximum permissible velocity for <br />stormwater discharges: <br /> <br />Maximum Permissible Velocities <br /> <br /> Feet/ Meters/ <br />Material Second Second <br /> <br />Fine sand (noncolloidal) <br />Sandy loam (noncolloidal) <br />Silt loam (noncolloidal) <br />Ordinary firm loam <br /> <br />2.5 0.8 <br />2.5 0.8 <br />3.0 0.9 <br />3.5 1.1 <br /> <br />12 <br /> <br /> <br />
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