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Article 6: Development Standar <br /> Section 6.14:Stormwater Management <br /> (y) They help maintainMaintenance of stream flow during dry <br /> periods.160 <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 designated161 for infiltration of A4P-e#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 /> (1) 1621n cases whererA non-structural mmethods may not <br /> adequately control the stormwater runoff generated by <br /> the first inch of rain from all project surfaces due to the amount of impervious <br /> surface proposed to be developed, or in cases where Non-Structural Methods <br /> are not effective or appropriate due to and-other factors such as se elope, <br /> the presence of highly erodible soils, <br /> impervious soils, steep slopes, and/or lack of vegetative cover, permanent <br /> Stormwater Control Measures (SCMS)163, which capture stormwater runoff for <br /> slow release through ar►controlled outlet, are required. <br /> (2) Where required, SCMs shall be constructed in accordance with this Section. <br /> (C) Impervious Surface and Deteptiop PandSCM164 Requirements <br /> (1) For all protected watersheds, an absolute limit on the percentage of lot area <br /> which can be covered with impervious surfaces has been established. See <br /> Section(s) 4.2.5 and 4.2.6 of this Ordinance. <br /> (2) In some cases, SCMs are required when the proposed impervious surface ratio <br /> exceeds a specified percentage, which is below the absolute limit. <br /> 6-1446.14.5 Applicability <br /> (A) The stormwater management standards and regulations included herein are applicable to <br /> all new development within the Orange County planning jurisdiction, including private, <br /> public, state, and federal development not covered by a separate NPDES permit, as <br /> follows: <br /> (1) Falls Lake Watershed <br /> (a) Any act�ik4ty-Land-Disturbing Activity165 that cumulatively disturbs greater <br /> than one-half acre of land in order to establish, expand or modify a single <br /> family or duplex residential development or a recreational facility. <br /> (b) Any aGt Land-Disturbing Activity that cumulatively disturbs greater <br /> than 12,000 square feet of land in order to establish, expand, or modify a <br /> 160 Text correction-grammar fixes within list. <br /> 161 Text correction-added "designated". <br /> 161 Section 6.14.4.6(1) re-formatted to improve readingdarityand fix grammar errors. <br /> 161 "Stormwater Control Measures"is correctly noted to match the Definitions section ofthis Ordinance,includes <br /> the appropriate acronym for Stormwater Control Measures(SCMs)—NOTE. "Stormwater Control Measure"and <br /> "SCM"are integrated through the remainder of Section 6.14,where applicable. <br /> 164 Consistentuse of SCM. <br /> 165 "Land-Disturbing Activity"correctlynoted to match the Ordinancedefinitions section-NOTE. "Land- <br /> Disturbing Activity"is integrated through the remainder of Section 6.14, where applicable. <br /> Orange County, North Carolina- Unified Development Ordinance Page 6-99 <br />