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Article 6: Development Standards 64 <br /> Section 6.14: Stormwater Management <br /> (1) Allowable on-site ster,,,water,.,,R# MeaSLIro� �cr-nn�� SCMs for nutrient <br /> reduction shall include those listed in the most current version 125 of the NCDEQ <br /> Stormwater Design Manual. <br /> (2) Design, maintenance and operation of stermwater-126SCMs shall follow <br /> standards provided in the most current version 127 of the NCDEQ Stormwater <br /> Design Manual. <br /> (3) Deviations from these standards may be allowed as approved on a case by case <br /> basis. <br /> (F) Total Nutrient Removal Rates <br /> Total nutrient removal rates of SCMs, as well as SCMs in a series, will be calculated <br /> pursuant to the approved accounting tools128. <br /> 6.14.8 Peak Runoff Volume <br /> (A) Standards for Falls Lake Watershed <br /> (1) For all new development, there shall be no net increase in peak flow leaving the <br /> site from the pre-development conditions for the 1_year, 24--hour storm. <br /> (B) Standards for Jordan Lake Watershed <br /> (1) For all new development there shall be no net increase greater than 10% in peak <br /> flow leaving the site from the pre-development conditions consistent with 15 A <br /> NCAC 02H.1002 (44) and the most current version 129 of the NCDEQ Stormwater <br /> Design Manual..-. <br /> (C) Calculating Peak Runoff Volume <br /> (1) The following are acceptable methodologies for computing the pre- and post- <br /> development conditions for the 1_year, 24—hour storm: <br /> (a) Rational Method, <br /> (b) Peak Discharge Method as described in the USDA Soil Conservation <br /> Service's Technical Release Number 55 (TR-55), <br /> (c) Alternative methods must be approved by the County. <br /> (2) The same method must be used for both the pre- and post-development <br /> conditions. <br /> 6.14.9 Stormwater Management Plan (SMP)13o <br /> (A) Required Approval <br /> The Erosion Control Officer shall not issue any" -Land Disturbing Permits <br /> L( DPs)131 for new development on any land within Orange County subject to the <br /> 121 Consistent reference to"most current version"of the NCDEQ Stormwater Design Manual. <br /> 126 Text correction—deleted "stormwater". <br /> 121 Consistent reference to"most current version"of the NCDEQ Stormwater Design Manual. <br /> 121 Text correction—added "s". <br /> 129 Consistent reference to"most current version"of the NCDEQ Stormwater Design Manual. <br /> Iso Title of Section 6.14.9 revised to include the appropriate acronym for Stormwater Management Plans(SMPs)— <br /> NOTE: "Stormwater Management Plan"and"SMP"are integrated through the remainder of Section 6.14, <br /> where applicable. <br /> 1s1"Land Disturbing Permits" is correctly noted to match the Definitions section of this Ordinance and the <br /> appropriate acronym for Land Disturbing Permits(LDPs) is included—NOTE. "Land Disturbing Permit"and"LDP" <br /> are integrated through the remainder of Section 6.14, where applicable. <br /> Orange County, North Carolina—Unified Development Ordinance Page 6-101 <br />