Unified Development Ordinance, 4th supplement, September 2017

Part 10A: Unified Development Ordinance City of Raleigh, North Carolina 8 – 42 Effective Date: September 01, 2013 Supp. No. 3 CHAPTER 8. ​SUBDIVISION & SITE PLAN STANDARDS | Article 8.8. Surface Water Drainage Sec. 8.8.1. Connection to Sanitary Sewer Prohibited Article 8.8. Surface Water Drainage Sec. 8.8.1. Connection to Sanitary Sewer Prohibited No surface water drainage shall empty into a sanitary sewer. Sec. 8.8.2. Piping of Watercourses A. This section applies to all storm drainage piping of watercourses except those crossing public or private streets. B. All natural watercourses shall remain open and unaltered unless piping, enclosing or altering is requested and justified by the developer or required by the PublicWorks Director, but then only when the following conditions are met: 1. The developer must connect the development pipe system to an existing public or private pipe storm drainage system when such system is determined by the PublicWorks Director to be reasonably accessible; 2. The developer must do all grading and provide all structures necessary to properly connect to the existing storm drainage system; 3. All design and construction must be to City standards; 4. Pipes and open channels must be designed in accordance with the Stormwater Control andWatercourse Manual; 5. Storm drains and culverts used in conjunction with streets must meet the standards of Sec. 9.3.6. a nd Sec. 9.3.7. ; 6. To preserve the screening function of CM Districts and protective yards, pipes which traverse any CM District or protective yard for a distance of at least 50 feet or more shall be built with a bend to prevent direct sight view through the yard provided that the bend must not exceed a 90-degree angle. The requirement of a bend within a CM District or a protective yard may be waived or modified waived or modified by the City Council where the gradient will not permit gravity flow or where the CM District or a protective yard fails to contain a vegetative screen; 7. Where natural drainage systems are used or where an approved pipe drainage system cannot be connected to an existing public pipe drainage system, a developer must do all grading to assure positive flow of stormwaters of the design storm and provide all drainage structures that are necessary to properly carry stormwater to locations which are acceptable to the PublicWorks Director; 8. The watercourse is located outside natural resource buffer yards of a -FWPOD, -SWPOD, UWPOD, -MPOD or CM District and outside riparian water surface buffers unless a variance is granted; and 9. The watercourse buffer standards of Sec. 9.2.3. , whenever applicable, are met. Sec. 8.8.3. Stormwater Control Plans A. For all subdivisions subject to Article 9.2. Stormwater Management through Article 9.5. Watershed Protection Areas , a stormwater control plan must be submitted and approved as part of the preliminary plan. B. This requirement may not apply to a subdivision where all proposed lots exceed 1 acre in size. C. If all lots exceed 1 acre in size, a stormwater control plan must be submitted for the streets, utilities and storm drainage areas for the entire subdivision, but no stormwater control plan is required to be submitted for each lot within the subdivision. D. A stormwater control plan must be approved for each individual lot within a subdivision at the time any permit is requested.