Agenda - 06-16-2015 - 5a - Laserfiche WebLink

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Article 4: Overlay Zoning Districts 16 Section 4.2: Watershed Protection IMPERVIOUS • POND REQUIREMENTS DISTRICT IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS(RESIDENTIAL) FLAT-PW 12%impervious surface limit for new and existing lots. [11, [21 HYCO-PW *&MPs n n n n# h-e i ed- #n satmsf i wate ro h e d i pe ry 0 9 61 s s 1rfaGe r q 61 0 Fe n#c 12%impervious surface limit for existing and new lots outside of Transition Areas as designated in the Orange County Land Use Plan. [11, [21 30%impervious surface limit for developments which exceed a density 1 du/acre within U-ENO-PW Transition Areas as designated in the Orange County Land Use Plan. Structural BMPs are BACK-PW 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%. 24%impervious surface limit with curb and gutter. 36%impervious surface limit without curb and gutter. [11, [21 [1] BMPs n n#ho i ed-#e co#isfy watershed impervieus irfaGe r Rts 70%impervious surface limit for residential uses developed at"high intensity"densities (R- L-ENO-PW 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 24%impervious surface limit. [11, [21 JORDAN-PW L r1] BMPs P-annet be used to satisfy watershed impeMeus irfa Ge r n#c [1;;"Awed Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the UDO.4 121 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. s Hillsborough Economic Development District (1) The ' h Economic Develo rict is located within the Lower Eno - Unprotected wa a the Hillsborough Economic Development District, as ed in the Lan ment of the Comprehensive Plan, the um impervious surface ratio is 50% with onds. 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. Orange County, North Carolina—Unified Development Ordinance Page 4-7