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Article 6: Development Standards 60 <br /> Section 6.14: Stormwater Management <br /> (1) The stormwater run-off generated by one inch of rain from all project area <br /> surfaces shall be controlled to the extent possible through on-site infiltration and <br /> through the use of methods which rely on natural soil properties for absorption <br /> and treatment. <br /> (2) Run-effStormwater runoff from roads, parking lots, and/or sidewalks shall be <br /> directed to undisturbed areas through use of berms, grassed diversion ditches or <br /> swales, or other acceptable means to reduce FUR Gf#stormwater runoff velocity <br /> and filter out pollutants. <br /> (3) Impervious Surface Limits <br /> (a) In order to promote infiltration of stormwater runoff into the soil and <br /> minimize direct and immediate runoff into streams and water supply <br /> impoundments, the maximum percentage of the total lot area which may <br /> be covered with an impervious surface shall be specified. This limit is <br /> referred to as the "impervious surface ratio". <br /> (b) Impervious surface calculations for an individual development shall be <br /> cumulative for original construction and any subsequent additions. One- <br /> half of the width of any of any existing or proposed road adjacent to an <br /> individual lot shall be included as impervious surface for that lot, except <br /> in the case where an existing road was contained within a dedicated <br /> public right-of-way at the time that the watershed regulations were first <br /> applied to the watershed within which the development is located. <br /> (4) Infiltration Tech 108 <br /> (a) The benefits of infiltratiGn ter.hni„„e&lnfiltration Systems include, but are <br /> not limited to109: <br /> (i) Removal of both suspended and dissolved pollutants, <br /> (ii) They Fern lire less Mainte-Rap, eRelatively low maintenance <br /> requirements, <br /> (iii) They FedUGe fleedk4qElood reduction, <br /> (iv) They ppematePromotion of groundwater recharge, and <br /> (v) They hen maintainMaintenance of stream flow during dry <br /> periods.10 <br /> (b) Where on-site " Infiltration Systems are utilized, areas <br /> for such purposes shall be designated on the plat and shall remain <br /> undisturbed both during and after construction. <br /> (c) Undisturbed areas designated"' for infiltration of run-sf#stormwater <br /> runoff shall also be located downslope from impervious surfaces and <br /> shall not include areas characterized by floodplains, highly erodible or <br /> impervious soils, steep slopes or previously disturbed areas. <br /> (d) Areas designated as suitable for septic tank nitrification fields may not be <br /> used for stormwater runoff infiltration purposes. <br /> (B) Stormwater Control Measures (SCMs) <br /> 10'"Infiltration Techniques" replaced with "Infiltration Systems"so as to better reflect the definition and <br /> terminology contained in 15A NCAC 02H.1002(Definitions)—NOTE. "Infiltration Systems"is integrated through <br /> the remainder of Section 6.14, where applicable. <br /> 109 Text correction—added ", but not limited to". <br /> 110 Text correction—grammar fixes within list. <br /> 111 Text correction—added "designated". <br /> Orange County, North Carolina—Unified Development Ordinance Page 6-97 <br />