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Orange County SE & SC Ordinance October 23 2007 <br />Open Space - the use of drainage facilities and vegetated buffer zones as open space, <br />recreation, and conservation areas shall be encouraged. <br />Recreational activities undertaken in these open space areas shall be limited to passive or <br />leisure activities. <br />Grassed Swales - drainage within the development shall be accommodated by the natural <br />drainage systems whenever possible. The use of grassed drainageways to channel water <br />shall be encouraged. The velocity of travel in this grassed swale shall range between 2 -4 <br />feet/second. <br />Retention of Runoff from Industrial Sites - On sites developed for industrial purposes <br />(i.e., uses involving the manufacturing, processing, creating, repairing, renovating, <br />painting, cleaning, or assembly of goods, merchandise, or equipment), retention or <br />detention areas meeting the standards set forth in subsection j. shall be used to insure that <br />runoff is retained on the site before being released. The purpose of this requirement is to <br />insure that, not only will the standard set forth in subsection 9A. be met, but also a <br />mechanism will be provided to safeguard the watershed against the spillage of toxic or <br />dangerous substances. <br />SECTION 9 STORMWATER OUTLET PROTECTION <br />A. Control of Discharge in University Lake, Cane Creek, and Upper Eno <br />Watersheds <br />Provisions shall be made for the control of stormwater discharges for the types of <br />development as specified below. After development of the site, the peak discharge of <br />stormwater runoff resulting from a ten -year storm shall be no greater than that which <br />would result from a ten -year storm on the same site prior to development. <br />This requirement shall apply to: <br />• Commercial, industrial, office, and institutional developments <br />• Multi- family residential developments of more than 10 units <br />• Single - family detached residential developments where more than 3 lots are to be <br />created. <br />B. Control of Velocity <br />Persons shall plan and conduct land - disturbing activity so that the post - construction <br />velocity of the 10 -year storm runoff in the receiving watercourse to the discharge point <br />does not exceed the greater of <br />• The velocity established by the table in paragraph 3 of the subsection; or <br />• The velocity of the 10 -year storm runoff in the receiving watercourse prior to <br />development. <br />19 <br />