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Orange County SE & SC Ordinance October 23 2007 <br />If conditions (1) or (2) of this paragraph cannot be met, then the receiving watercourse to <br />and including the discharge point shall be designed and constructed to withstand the <br />expected velocity anywhere the velocity exceeds the "prior to development" velocity by <br />10 %. <br />C. Standards <br />1. Acceptable Management Measures <br />Measures applied alone or in combination to satisfy the intent of this subchapter <br />are acceptable if there are no objectionable secondary consequences. Innovative <br />techniques and ideas will be considered and may be used when shown to have the <br />potential to produce successful results. Some alternatives are to: <br />• Avoid increases in surface runoff volume and velocity by including measures <br />to promote Infiltration to compensate for increased runoff from areas rendered <br />impervious; <br />• Avoid increases in stormwater discharge velocities by using vegetated or <br />roughened swales and waterways in lieu of closed drains and high velocity <br />paved sections; <br />• Provide energy dissipaters at outlets of storm drainage facilities to reduce flow <br />velocities to the point of discharge; these may range from simple rip- rapped <br />sections to complex structures; <br />• Protect watercourses subject to accelerated erosion by improving cross sections <br />and/or providing erosion - resistant lining. <br />2. Exceptions <br />This rule shall not apply in areas other than the University Lake, Cane Creek, and <br />Upper Eno Watersheds where it can be demonstrated that storm water discharge <br />velocities will not create an erosion problem in the receiving watercourse. <br />20 <br />