Orange County NC Website
Browse       Search
Article 6: Development Standards 92 <br /> Section 6.14:Stormwater Management <br /> (5) Proposedrepesed new development may satisfy the review criteria standards of <br /> this section by rngt4no tht; nosf-daiplonmonf hvdrnlonir_ oriforia co#n,if i <br /> ha for r) of fho mnsf roronf �Qrsinn of fho North r'a rnlina I Aw Im arf <br /> lssusing a Runoff Volume Match design approach (also <br /> referred to as a Low Impact Development (LID) design approach) in conformance <br /> with 15A NCAC 02H.1002 (44). If pursued, a Runoff Volume Match design <br /> approach must include the use of the accounting methodologies approved by the <br /> North Carolina Division of Energy. Mineral, and Land Resources (NCDEMLR).169 <br /> (B) Additional Standards— Falls Lake Watershed <br /> (1) In addition to the standards contained in Section 6.14.6 (A) of the-II99this <br /> Ordinance170, development shall observe a no net increase in peak flow leaving <br /> the site from predevelopment conditions for the 1 year, 24 hour, storm. <br /> (2) Proposed new development using a Runoff Volume Match design approach for <br /> satisfying stormwater management requirements must also include the <br /> estimation of pre-development and post-development nutrient export rates (e.g. <br /> Nitrogen and Phosphorous) for the proposed development, using the nutrient <br /> accounting methodologies approved by the North Carolina Division of Water <br /> Resources (NCDWR). Nutrient export estimates are required for Runoff Volume <br /> Match record-keeping purposes.171 <br /> (C) Addmtman2ll Stand2rds-- _Iard2n 1-240 1A/24orshad <br /> (1)!A addi#inn #n#ho s#anrlarrls nnn#ainorl in Cor#inn 6 14 6 (A) of the I DQ <br /> G9A72 deyelonmon# shall abide by 15 A ISIGAG 0:2H 1(1(1�T173 <br /> 614,66.14.7 Nutrient Load <br /> (A) Nitrogen and phosphorus loads contributed by proposed new development shall not <br /> exceed the following unit-area mass loading rates: <br /> (1) Falls Lake Watershed <br /> (a) Nitrogen, 2.2 pounds per acre per year <br /> (b) Phosphorus, 0.33 pounds per acre per year <br /> (B) The nutrient export from each new development shall be calculated in pounds per acre <br /> per year (using the approved accounting tools 174) in accordance with the methodologies <br /> approved by the North Carolina Division of Water Resources (NCDWR).176 <br /> 168 NOTE: The original UDO text, "by meeting the post-development hydrologic criteria set out in Chapter 2 of the <br /> most recent version of the North Carolina Low Impact Development Guidebook"was accidentallydeleted/accepted <br /> duringthis 1+year-long LIDO text amendment review process. For the purposed of universal clarity,the original <br /> text has been artificially added in here with a stri kethrough font, so as to show what the original text looked like. <br /> This artificially added text must be deleted manuallyafter all TRACK CHANGES are eventually accepted for formal <br /> UDO adoption. <br /> "I Section 6.14.6(A) 5 has been updated to refer to the state's current useof the term "Runoff Volume Match", <br /> ratherthan referencingthe now outdated 2009 LID Guidebook, AND basedon Legal Sufficiency Review comments. <br /> 170 Consistent reference to "this Ordinance". <br /> 171 Required per the state's most current Neuse-Tar-Pamlico Rules. <br /> rnnrirron+rofor.,..G., to 4hir, nrrliA@AG@ <br /> 171 Section 6.14.6(C) is no longer needed, as the allowableuseof"Runoff Volume Match" methodology applies to <br /> both the Falls Lake Watershed and the Jordan Lake Watershed,as specified in revised Section 6.14.6(A). <br /> 174 Text correction—added "s". <br /> 175 Revised to refer to NCDWR forapproved nutrient accountingtools,rather than NCDEQ. <br /> Orange County, North Carolina— Unified Development Ordinance Page 6-101 <br />