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Article 4: Overlay Zoning Districts Section 4.2: Watershed Protection Orange County, North Carolina – Unified Development Ordinance Page 4-7 TABLE 4.2.5.1: IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS (RESIDENTIAL) DISTRICT IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS (RESIDENTIAL) 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. 4 [2] Regardless of the proposed amount of impervious surface area, a stormwater feature/best management practice (BMP) may still be required based on the proposed amount of land disturbance on a given parcel of property in accordance with applicable Orange County Erosion Control and State Stormwater regulations. 5 (A) Hillsborough Economic Development District (1) The Hillsborough Economic Development District is located within the Lower Eno - Unprotected watershed. Within the Hillsborough Economic Development District, as designated in the Land Use Element of the Comprehensive Plan, the maximum impervious surface ratio is 50% with detention ponds. 4 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. 5 The County enforces land disturbance thresholds for erosion control and stormwater permits, specifically a certain amount of land disturbance will require the submittal of either an erosion control permit and/or a stormwater permit application. While a BMP may be installed on a parcel of property as part of a proposed modification of allowable impervious surface area, the County also enforces standards requiring a BMP on property being developed for residential purposes based on the proposed amount of land disturbance. This requirement has nothing to do with the total amount of impervious surface area proposed or any request to modify same. Land disturbance thresholds vary for each district. We are adding language to the UDO clarifying when a BMP is required based on these existing disturbance thresholds. 55