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Article 4: Overlay Zoning Districts <br /> Section 4.2: Watershed Protection <br /> IMPERVIOUS ■ • •• ■ REQUIREMENTS <br /> DISTRICT IMPERVIOUS ■ . POND REQUIREMENTS <br /> FLAT-PW 12% impervious surface limit for new and existing lots. [11, [21 „J' <br /> *BMPS Ga he w et ed-te satisfy ate shed ,Ffa Fecluireme t <br /> 12%impervious surface limit for existing and new lots outside of Transition Areas as <br /> designated in the Orange County Land Use Plan. 111, [21 <br /> 30% impervious surface limit for developments which exceed a density 1 du/acre within <br /> U-ENO-PW Transition Areas as designated in the Orange County Land Use Plan. Structural BMPs are <br /> BACK-PW required if impervious surface exceeds 12%. <br /> 70% impervious surface limit for residential uses developed at"high intensity'densities(R- <br /> 5, R-8, and R-13)in an Economic Development District as designated in the Land Use <br /> Element of the Comprehensive Plan(high-density option)with structural BMPs if ISR <br /> exceeds}12%. <br /> 24% impervious surface limit with curb and gutter. <br /> 36%impervious surface limit without curb and gutter. <br /> en+c <br /> 70�% impervious surface limit for residential uses developed at"high intensity"densities(R- <br /> L-ENO-PW 5, R-8, and R-13)in an Economic Development District as designated in the Land Use <br /> Element of the Comprehensive Plan(high-density option),with structural BMPs required <br /> when impervious surface exceeds: <br /> 24%(w/curb and gutter);or <br /> 36% w/o curb and gutter). <br /> HAW-PW 24% impervious surface limit.L11_0 <br /> JORDAN-PW L <br /> [1] <br /> allewed Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the UDO.4 <br /> f21 Regardless of the proposed amount of impervious surface area a stormwater feature/best management practice <br /> (BMP)may still be required based on the proposed amount of land disturbance on a given parcel of property in <br /> accordance with applicable Orange County Erosion Control and State Stormwater regulations. s <br /> Hillsborough Economic Development District <br /> (1) The ' u h Economic Develo s rict is located within the Lower Eno <br /> -Unprotected water ' n the Hillsborough Economic Development <br /> District, as ed in the Lan ment of the Comprehensive Plan, the <br /> um impervious surface ratio is 50%with onds. <br /> 4 This references the Section of the UDO where are now recognizing a State provision allowing for the additional <br /> allotment of impervious surface area through the use of specific BMPs. <br /> 5 The County enforces land disturbance thresholds for erosion control and stormwater permits,specifically a <br /> certain amount of land disturbance will require the submittal of either an erosion control permit and/or a <br /> stormwater permit application. While a BMP may be installed on a parcel of property as part of a proposed <br /> modification of allowable impervious surface area,the County also enforces standards requiring a BMP on <br /> property being developed for residential purposes based on the proposed amount of land disturbance. This <br /> requirement has nothing to do with the total amount of impervious surface area proposed or any request to <br /> modify same. Land disturbance thresholds vary for each district. We are adding language to the LIDO clarifying <br /> when a BMP is required based on these existing disturbance thresholds. <br /> Orange County,North Carolina—Unified Development Ordinance Page 4-7 <br />