Unified Development Ordinance, 4th supplement, September 2017

Part 10A: Unified Development Ordinance City of Raleigh, North Carolina 9 – 10 Effective Date: September 01, 2013 Supp. No. 4 Article 9.2. Stormwater Management Sec. 9.2.1. General Provisions A. Applicability Prior to any land disturbing activity or subdivision of land, stormwater control measures, watercourse buffers or both must be provided in conformity with the requirements of this Article. B. Manual and Guidelines Incorporated The Raleigh Stormwater Control andWatercourse Buffer Manual along with the Guidelines for Land Disturbing Activities and amendments, on file in the City Clerk’s Office, is adopted by reference as part of this UDO. Sec. 9.2.2. Active Stormwater Control Measures A. Exemptions Subject to the additional runoff controls required in Sec. 9.2.2.E.3 and the impervious surface limitations and other regulations of subsection A.4 below, the following are exempt from the active stormwater control measures required by Sec. 9.2.2 : 1. Grandfathered Lots a. Defined Any lot which was either recorded prior to May 1, 2001 (the first application of the Stormwater Management Ordinance) or lawfully recorded later as part of a subdivision approved prior to May 1, 2001. b. Use Standards i. A grandfathered lot of any size, including grandfathered lots that are recombined with other grandfathered lots, used for any detached house used for single-unit living or any attached house used for two- unit living, including accessory uses. ii. A grandfathered lot of one-half acre or less that has not been altered to be larger than one-half acre in size, used for any other lawful use requiring a plot plan or site plan. 2. Subdivided Lots a. Defined A lot created by a subdivision approved after May 1, 2001. b. Use Standard i. Any detached house used for single-unit living or any attached house used for two-unit living, including their accessory uses, situated on a subdivided lot that was part of a subdivision of one acre or less in aggregate size, including subdivided lots that are recombined with other similar subdivided lots. ii. Any other lawful use requiring a plot plan or site plan situated on a subdivided lot that was part of a subdivision of one-half acre or less in aggregate size. 3. Other Exemptions a. Land-disturbing activities, not otherwise exempted, that do not require a land-disturbing permit under Sec. 9.4.6 are exempted provided that, upon application of any impervious surfaces this exemption shall not apply. b. Substitution of impervious surfaces when all the standards of Sec. 10.3.4.E are met. c. Substitution of impervious surfaces with approved pervious surfaces. 4. Impervious Surfaces Limitations and Other Regulations a. Lots exempted by subsections A.1 or A.2 above shall be subject to Sec. 9.2.2 et seq. when the applicable maximum impervious surface area of the lot exceeds: Zoning District Maximum Percentage of Impervious Surface Coverage R-1 20% R-2 25% R-4 38% R-6 51 % R-10 and all other base zoning districts 65% CHAPTER 9. ​NATURAL RESOURCE PROTECTION | Article 9.2. Stormwater Management Sec. 9.2.1. General Provisions

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