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Article 4: Overlay Zoning Districts Section 4.2: Watershed Protection Orange County, North Carolina – Unified Development Ordinance Page 4-6 4.2.5 Impervious Surface and Detention Pond Requirements for Residential Uses TABLE 4.2.5.1: IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS (RESIDENTIAL) DISTRICT IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS (RESIDENTIAL) UNIV-CA UNIV-PW 6% impervious surface limit. EXCEPT for all lots which existed prior to 4/2/90, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios – Univ, Cane, and Little). [1], [2] BMPs cannot be used to satisfy watershed impervious surface requirements. 1 CANE-CA CANE-PW 6% impervious surface limit. EXCEPT for lots smaller than two acres which existed prior to 1/1/94, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios – Univ, Cane, and Little). [1], [2] * BMPs cannot be used to satisfy watershed impervious surface requirements. U-ENO-CA 6% impervious surface limit. EXCEPT for lots smaller than five acres which existed prior to 6/1/2010, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios – Upper Eno). [1], [2] * BMPs cannot be used to satisfy watershed impervious surface requirements. LITTLE-PW 6% impervious surface limit. EXCEPT for lots which existed prior to 1/1/94, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios - Univ, Cane, and Little). [1], [2] * BMPs cannot be used to satisfy watershed impervious surface requirements. FLAT-PW HYCO-PW 12% impervious surface limit for new and existing lots. [1], [2] * BMPs cannot be used to satisfy watershed impervious surface requirements. U-ENO-PW BACK-PW 12% impervious surface limit for existing and new lots outside of Transition Areas as designated in the Orange County Land Use Plan. [1], [2] [1] BMPs cannot be used to satisfy watershed impervious surface requirements. 30% impervious surface limit for developments which exceed a density 1 du/acre within Transition Areas as designated in the Orange County Land Use Plan. Structural BMPs are required if impervious surface exceeds 12%. 70% impervious surface limit for residential uses developed at “high intensity” densities (R- 5, R-8, and R-13) in an Economic Development District as designated in the Land Use Element of the Comprehensive Plan (high-density option) with structural BMPs if ISR exceeds>12%. L-ENO-PW 24% impervious surface limit with curb and gutter. 36% impervious surface limit without curb and gutter. [1], [2] [1] BMPs cannot be used to satisfy watershed impervious surface requirements. 70% impervious surface limit for residential uses developed at “high intensity” densities (R- 5, R-8, and R-13) in an Economic Development District as designated in the Land Use Element of the Comprehensive Plan (high-density option), with structural BMPs required when impervious surface exceeds: 24% (w/ curb and gutter); or 36% (w/o curb and gutter). HAW-PW JORDAN-PW 24% impervious surface limit. [1], [2] [1] BMPs cannot be used to satisfy watershed impervious surface requirements. [1] BMP’s as mandated by the Stormwater Management Program for Lands within the Neuse River Basin are allowed. Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the UDO. 2 1 Staff is editing existing notes throughout the Section to address existing typographical and reference errors. In the existing text an asterisk (‘*’) in certain cases was used to denote information while in other cases it was not. There was also a [1] used to identify certain watersheds requiring a BMP in the Neuse River Basis. Unfortunately the watershed overlay districts identified are not in the Neuse River Basin. The proposed amendments address these issues and clarify the essential information. 2 This references the Section of the UDO where are now recognizing a State provision allowing for the additional allotment of impervious surface area through the use of specific BMPs. 29