ORD-2019-005 UDO amendment - stormwater runoff

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Article 4: Overlay Zoning Districts 22 Section 4.2:Watershed Protection IMPERVIOUSTABLE 4.2.6: • POND REQUIREMENTS DISTRICT IMPERVIOUS SURFACEMETENTION POND REQUIREMENTS UNIV-CA 5-acre minimum lot size, with potential of up to five lots as small as two acres for lots of record September 1, CANE-CA 2015(University Lake)or October 19, 1999 (Cane Creek); AND 6% impervious surface limit. [11, 121 U-ENO-CA 2-acre minimum lot size AND 6% impervious surface limit. [1], [2] 5-acre minimum lot size with potential of up to five lots as small as two acres for lots of record September 1, 2015(University Lake)or October 19, 1999 (Cane Creek); AND UNIV-PW 50% ISR for all fire stations and solid waste collection centers;AND CANE-PW 12% ISR for all other non-residential uses;AND on-site infiltration of the first inch of stormwater runoff;AND a limit of 1.0%of the watershed for non-residential use(139 acres in CANE-PW). [1], [2] 2-acre minimum lot size AND 50% ISR for all fire stations and solid waste collection centers;AND LITTLE-PW 12% ISR for all other non-residential uses; AND on-site infiltration of the first inch of stormwater runoff;AND a limit of 1.0% of the watershed for non-residential use 406 acres in LITTLE-PW . [11, 2 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 str, Gt ral BMP stormwater control measures SCMs if ISR exceeds 12%; AND 50% ISR for all fire stations and solid waste collection centers outside of Commercial and/or Commercial- U-ENO-PW Industrial Nodes as designated in the Land Use Element of the Comprehensive Plan, with stru.turaal nnAPSSCMs BACK-PW 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; 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] 50% ISR for all fire stations and solid waste collection centers; AND HYCO-PW 12% ISR for all other non-residential uses;AND FLAT-PW 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 70% impervious surface, with structural BMP-s SCMs required when impervious surface exceeds: L-ENO-PW 24% (w/curb and gutter); or 36% w/o curb and gutter). [1], [2] HAW-PW 24% impervious surface limit. [1], [2] JORDAN-PW [1]Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the LIDO. [2] For non-residential developments a stormwater feature/best management practice (BMP)SCM shall be required in accordance with applicable local and State standards based on proposed land disturbance and/or a project exceeding impervious surface thresholds 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. Orange County, North Carolina—Unified Development Ordinance Page 4-8