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Article 4: Overlay Zoning Districts Section 4.2: Watershed Protection Orange County, North Carolina – Unified Development Ordinance Page 4-9 TABLE 4.2.6: IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS DISTRICT IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS (NON-RESIDENTIAL) U-ENO-PW BACK-PW 70% ISR in Economic Development, Commercial and/or Commercial- Industrial Nodes as designated in the Land Use Element of the Comprehensive Plan (high-density option) with structural BMPs if ISR > exceeds 12%; AND 50% ISR for all fire stations and solid waste collection centers outside of Commercial and/or Commercial- Industrial Nodes as designated in the Land Use Element of the Comprehensive Plan, with structural BMPs if ISR > exceeds 12%; AND 12% ISR for all other non-residential uses outside of Commercial and/or Commercial-Industrial Nodes as designated in the Land Use Element of the Comprehensive Plan (* BMPs cannot be used to satisfy watershed impervious surface requirements); AND on-site infiltration of the first inch of stormwater runoff; AND A limit of 1,151 acres of non-residential use throughout U-ENO-PW (5.0%) and 163 acres throughout BACK-PW (1%). [1], [2] HYCO-PW FLAT-PW 50% ISR for all fire stations and solid waste collection centers; AND 12% ISR for all other non-residential uses; AND on-site infiltration of the first inch of stormwater runoff;AND limit of 1% of the watershed for non-residential use (37 acres in HYCO-PW, 66 acres in FLAT-PW). [1], [2] BMPs cannot be used to satisfy watershed impervious surface requirements. L-ENO-PW 70% impervious surface, with structural BMPs required when impervious surface exceeds: 24% (w/ curb and gutter); or 36% (w/o curb and gutter). [1], [2] HAW-PW JORDAN- PW 24% impervious surface limit. [1], [2] 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. [1] Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the UDO. [2] For non-residential developments a stormwater feature/best management practice (BMP) shall be required in accordance with applicable local and State standards based on proposed land disturbance and/or a project exceeding 12% impervious as identified herein. NOTE: Non-residential use impervious acreage limits in watershed with such limits are calculated using the actual amount of impervious surface for non-residential uses throughout the watershed, not by the overall number of acres of non-residential parcels located in a particular watershed. (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. 4.2.7 Placement of Streets, Driveways, and Buildings (A) Streets, driveways, and buildings or other structures shall be located, to the extent reasonably possible, so as to take full advantage of the absorptive capacity of the soils on which they are to be situated and to avoid the following environmentally sensitive areas: (1) Stream buffer zones as required by Section 6.13; (2) Wetlands as defined by the U.S. Army Corps of Engineers; (3) Land with slopes greater than 15%; and (4) Natural areas as identified in the Inventory of Natural Areas and Wildlife Habitats of Orange County, NC. 32