Unified Development Ordinance, 4th supplement, September 2017

Part 10A: Unified Development Ordinance City of Raleigh, North Carolina 9 – 44 Effective Date: September 01, 2013 Supp. No. 4 Sec. 9.5.2. Falls Watershed Protection Overlay District (-FWPOD) A. Natural Resource Buffer Yards Natural resource buffer yards consistent with Sec. 9.2.3. must be established. B. Impervious Surface Coverage 1. All lots or portions of lots in existence prior to March 1, 1988 or lots established outside the subdivision process after that date, no additional impervious surface may be added to the property which would result in greater coverage by impervious surface than allowed by the following table: Area No Stormwater Control Measures Retention, Detention or Capture First Half Inch of Runoff Wet Ponds Capturing First Inch of Rainfall Primary water supply watershed protection areas 6%; or 3,500 sq. ft. if this is not more than 12% N/A N/A Secondary water supply watershed protection areas not connected to both City water and sewer utilities 12%; or 3,500 sq. ft. if this is not more than 24% N/A N/A Secondary water supply watershed protection areas with connections to both City water and sewer utilities 12%; or 3,500 sq. ft. if this is not more than 24% 24% 30% or 3,500 sq. ft. if this is not more than 50%; 70% in areas designated in the Comprehensive Plan for higher impervious sur- faces 2. Impervious surfaces include all proposed public and private streets within the development approved after June 20, 1993 and all impervious surfaces on any lot and common area. 3. Calculation of the area of the development includes all subdivision lots, new street rights-of-way established after June 20, 1993 and common areas within the watershed. Calculation of the area of the development excludes any widening of existing street rights-of-way, existing street rights-of-way and new street rights-of-way reserved in accordance with the Roadway Corridor Official Map Act, N.C. Gen. Stat. Chapter 136 Article 2E. 4. All lots established after June 20, 1993 must comply with the impervious surface coverage standards of the Article. 5. Substitutions of impervious surfaces done in accordance with Sec. 10.3.5.A. are allowed. C. Required Stormwater Measures 1. Stormwater Retention, Detention and Capture a. Within any secondary watershed protection area, lots which are connected to both City water and sewer utilities and have a total maximum impervious surface of more than 3,500 square feet may have an impervious coverage of more than 12% and less than 24%; provided that the first ½ inch of stormwater which directly or indirectly runs off the surfaces in excess of 12%, from the lot is: i. Retained for either infiltration into the soil or for evaporation into the air; ii. Detained for at least a 12-hour period; or iii. Captured by an approved stormwater treatment device. b. Additional impervious surface coverage is allowed in secondary reservoir watershed protection areas when the first inch of rainfall (including the amount from the first 24% impervious surface coverage) is captured by a wet pond. 2. Stormwater Runoff From Streets a. Where impervious surface coverage is equal to or less than 12% in any primary water supply watershed protection area or equal to or less than 24% in any secondary water supply watershed protection area, the first ½ inch of stormwater which runs off any street must be contained within the development capture methods set forth in Sec. 9.5.2.C.1. above. CHAPTER 9. ​NATURAL RESOURCE PROTECTION | Article 9.5. Watershed Protection Areas Sec. 9.5.2. Falls Watershed Protection Overlay District (-FWPOD)

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