Agenda - 03-17-2015 - 7e - Laserfiche WebLink

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12 ATTACHMENT 1 — COUNTY AND STATE IMPERVIOUS SURFACE LIMITS: Watershed Overlay District Impervious Surface Limits — Residential Impervious Surface Limits — Non - residential State Allowanoes University Lake — 6% 6% Low Density Option: Protected Lots existin g p rior to April 2, Lots existin g p rior to April 2, 1990 6% limit with minimum lot size (STATE 1990 subject to sliding scale — subject to sliding scale — See of 1 acre Classified WS -II See Section 4.2.5.2 of LIDO Section 4.2.5.2 of LIDO OR Watershed Area) Density in this area is limited to Density in this area is limited to 1 ® 12% limit with minimum lot size 1 dwelling unit for every 5 acres dwelling unit for every 5 acres of of 2 acres. of property. property. Certain parcels in existence Certain parcels in existence prior High Density Option: 2 prior to October 2, 1989 qualify to October 2, 1989 qualify for a If new development exceeds low for a density bonus of a density bonus of a maximum of 5 density option, engineered maximum of 5 dwelling units for dwelling units for every 2 acres of stormwater controls required with every 2 acres of property with property with any future development limited to either 24% any future development being development being held to the 1 to 30% impervious surface area 3 held to the 1 unit for 5 acre unit for 5 acre density limit. A of 10% of the density limit. maximum watershed outside of a Critical Area can be developed up to 70% impervious with a structural BMP. University Lake — 6% 6% SAME AS ABOVE Critical Lots existing prior to April 2, Lots existing prior to April 2, 1990 (STATE 1990 subject to sliding scale — subject to sliding scale — See Classified WS-11 See Section 4.2.5.2 of LIDO Section 4.2.5.2 of UDO Watershed Area) Density in this area is limited to Density in this area is limited to 1 1 dwelling unit for every 5 acres dwelling unit for every 5 acres of of property. property. Certain parcels in existence Certain parcels in existence prior prior to October 2, 1989 qualify to October 12, 1989 qualify for a for a density bonus of a density bonus of a maximum of 5 maximum of 5 dwelling units for dwelling units for every 2 acres of every 2 acres of property with property with any future any future development being development being held to the 1 held to the 1 unit for 5 acre unit for 5 acre density limit. density limit. 1 Property within the University Lake Protected and Critical Watershed Protection Overlay Districts is also located within the Rural Buffer (RB) general use zoning district. In developing the RB zoning district, which was done prior to the development and adoption of Watershed Overlay standards, the County chose to require a 2 acre minimum lot size. We then chose to impose the more restrictive impervious surface limit in an effort to ensure the protection of the Chapel Hill /Carrboro water source. Z There was a conscious decision made as reflected in the Joint Planning Land Use Plan, Joint Planning Land Use Plan Agreement, and adopted 2030 Comprehensive Plan to keep the area within the RB zoning district at a low density. Changing this policy will require the amendment of the aforementioned document(s). Non - residential development(s) are held to the 6% impervious surface limit. 3 Critical areas, under high density, are limited to 24% while protected areas are limited to 30% impervious surface.