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Article 4: Overlay Zoning Districts 32 Section 4.2: Watershed Protection 6 Unlike residential development, State regulations require a stormwater feature for all non - residential projects exceeding established impervious surface thresholds for the watershed protection overlay district in which the Orange County, North Carolina — Unified Development Ordinance Page 4 -9 IMPERVIOUS TABLE 4.2.6: • POND REQUIREMENTS DISTRICT IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS 2 -acre minimum lot size AND U- ENO -CA 6% impervious surface limit. [11, [21 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) ( rneRded 10 19 99); AND 50% ISR for all fire stations and solid waste collection centers; AND UNIV -PW 12% ISR for all other non - residential uses, AND on -site infiltration of the first inch of stormwater runoff; AND CANE -PW a limit of 1.0% of the watershed for non - residential use (139 acres in CANE -PW). [11 [2[ WARS n r.+ ho i od +r. satisfy watershed i iirFono r n +c FRe L JiLL 2 -acre minimum lot size AND 50% ISR for all fire stations and solid waste collection centers; AND 12% ISR for all other non - residential uses, AND LITTLE -PW 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). f11 i [21 WARS A n+ he i ed +n satisfy watershed i 614ar.o r n +c L JL� 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 U- ENO -PW exceeds 12 %; AND BACK -PW 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%). [11, [21 50% ISR for all fire stations and solid waste collection centers; AND 12% ISR for all other non - residential uses; AND HYCO -PW on -site infiltration of the first inch of stormwater runoff-AND FLAT -PW limit of 1% of the watershed for non - residential use (37 acres in HYCO -PW, 66 acres in FLAT -PW). f11 f71 DRADc nnnnnt ho i ised +n satisfy watershed impervieus iiraGe r n +c 70% impervious surface, with structural BMPs required when impervious surface exceeds: L- ENO -PW 24% (w/ curb and gutter); or 36% (w /o curb and gutter). [11, [21 HAW -PW 24% impervious surface limit. JORDAN- [1], [21 DnnDs , n+ ho usod. +n satisfy watershed i 66IFfaGe r +� PW [I BMP's as mandated by the StArmwater f11 Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the UDO. 121 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 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. 6 Unlike residential development, State regulations require a stormwater feature for all non - residential projects exceeding established impervious surface thresholds for the watershed protection overlay district in which the Orange County, North Carolina — Unified Development Ordinance Page 4 -9