Unified Development Ordinance, 5th supplement, March 2018

Part 10A: Unified Development Ordinance City of Raleigh, North Carolina 9 – 20.1 Effective Date: March 6, 2018 Supp. No. 5 b. The City Council may reduce the width of natural resource buffers when it determines that the extent of the natural resource buffer yard will deprive the landowners of reasonable use of their property. c. The width of the natural resource buffer shall be measured perpendicularly to the flow of the watercourse and horizontally from the edge of the watercourse banks. When no watercourse banks exist, the centerline of the watercourse shall be used. d. Open space requirements for Conservation Development and Compact Development ( Sec 2.5 ), and Planned Development ( Sec. 4.7 ) may receive an open space bonus if the site exceeds the minimum natural resource buffer requirement. The open space bonus shall be based on a sliding- scale factor from 0.9 (10% greater than required buffer) to 0.5 (100% greater than required buffer). The open space credit factor shall be determined as follows: (Area of required natural resource buffer)/(Area of proposed natural resource buffer) = Credit Factor. See required buffer area in Section 2.5.2.A.2 . This credit factor may be multiplied times the required open space area and may meet up to 50% of Conservation Development, Compact Development, and Planned Development open space requirements. This bonus does not apply to open space requirements in Section 9.2 , Stormwater Management. 2. Falls Watershed Protection Overlay District, Swift Creek Watershed Protection Overlay District and Conservation Management District Watercourse Buffers Natural resource buffers shall be established along primary and secondary watercourses in a -FWPOD, -SWPOD or CM District. a. Primary Watercourse Natural Resource Buffers Natural resource buffers along primary watercourses must meet the following standards. i. The buffer must be a minimum of 60 feet wide along each side of any watercourse draining 25 or more acres. ii. The buffer must be a minimum of 35 feet wide along each side of any watercourse draining 5 or more acres but less than 25 acres. iii. The buffer must be a minimum of 35 feet wide along each side of any watercourse which is a stream draining less than 5 acres. iv. In the event that the property or subdivision contains impervious surface lot coverage in excess of 24% in a secondary reservoir watershed protection area, the buffer shall be no less than 100 feet wide along each side of the watercourse. b. Secondary Watercourse Natural Resource Buffers Unless part of a primary watercourse natural resource buffer, the secondary watercourse natural resource buffers consists of one or more of the following: i. Lands within the flood prone areas that adjoin primary watercourse natural resource buffers; or ii. Lands with slopes 15% or greater, adjoining a primary watercourse natural resource buffers or a flood prone area. 3. Metro-Park Overlay District Watercourse Buffers Natural resource buffers shall be established as primary tree conservation areas pursuant to Sec. 5.2.2.C.2. and Article 9.1. Tree Conservation along primary and secondary watercourses in a -MPOD. Required tree conservation areas shall meet the following standards. a. The primary tree conservation area must be a minimum of 50 feet wide along each side of any watercourse draining 25 or more acres. b. The primary tree conservation area must be a minimum of 25 feet wide along each side of any watercourse draining 5 or more acres but less than 25 acres. 4. Urban Water Supply Watershed Protection Overlay District Watercourse Buffers Natural resource buffers shall be established along primary and secondary watercourses in a -UWPOD. Required natural resource buffers shall meet the following standards. a. A minimum 30 foot wide natural resource buffer is required for all perennial waters indicated on the most recent versions of USGS 1:24,000 (7.5 minute) scale topographic maps. b. A minimum 100-foot wide natural resource buffer is required for all new development activities that exceed: Article 9.2. Stormwater Management | CHAPTER 9. ​NATURAL RESOURCE PROTECTION Sec. 9.2.3. Watercourse Buffers

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