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icts <br /> Article 4: Overlay Zoning Distri 63 <br /> Section 4.2:Watershed Protection <br /> TABLE 4.2.6:IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS <br /> DISTRICT IMPERVIOUS SURFACEIDETENTION POND REQUIREMENTS(NoN-RESIDENTIAL) <br /> 70% <br /> ISR in Economic Development73,Commercial,andfor Commercial-industrial aF;"F ir:idwstoal Nodes as <br /> designated in the Land Use Element of the Comprehensive Plan(high-density option)with structural BMPs if ISR <br /> >12%; AND <br /> 50%ISR for all fire stations and solid waste collection centers outside of Commercial and/or Commercial- <br /> U-ENO-PW Industrial an"F industgal-Nodes as designated in the Land Use Element of the Comprehensive Plan,with <br /> BACK-PW structural BMPs if ISR>12%; AND <br /> 12%ISR for all other non-residential uses outside of Commercial andfor Commercial-industria[74 and.16-F Ind-us-tria-I <br /> Nodes as designated in the Land Use Element of the Comprehensive Plan(*BMPs cannot be used to satisfy <br /> watershed impervious surface requirements);AND <br /> on-site infiltration of the first inch of stormwater runoff,AND <br /> A limit of 1,151 acres of non-residential use throughout U­EN0-PW(5.0%)and 163 acres throughout BACK-PW <br /> (1%y <br /> 50%ISR for all fire stations and solid waste collection centers; AND <br /> HYCO-PW* 12%ISR for all other non-residential uses;AND <br /> FLAT-PW on-site infiltration of the first inch of stormwater runoffAND <br /> limit of 1%of the watershed for non-residential use(37 acres in HYCO-PW,66 acres in FLAT-PW). <br /> [1)BMPs cannot be used to satisfy watershed impervious surface requirements. <br /> 70%impervious surface,with structural BMPs required when impervious surface exceeds: <br /> L-ENO-PW 24%(wt curb and gutter);or <br /> 36%(w10 curb and gutter). <br /> HAW-PW 24%impervious surface limit <br /> JORDAN- [1]BMPs cannot be used to satisfy watershed impervious surface requirements. <br /> PW <br /> [1]BMP's as mandated by the Stormwater Management Program for Lands within the Neuse River Basin are allowed, <br /> NOTE: Non-residential use impervious surface acreage limits in watersheds with such limits are calculated using the actual <br /> amount impervious surface for non-residential uses throughout the watershed,not by the overall number of acres of a non- <br /> 75 <br /> residential parcels located in a particular watershed, <br /> (A) Hillsborough Economic Development District <br /> (1) The Hillsborough Economic Development District is located within the Lower Eno <br /> —Unprotected watershed. Within the Hillsborough Economic Development <br /> District, as designated in the Land Use Element of the Comprehensive Plan, the <br /> maximum impervious surface ratio is 50%with detention ponds.76 <br /> 73 Impervious Surface Ratio requirements in Ation 6.3.7 are suggested to be relocated to this Section of the UDO <br /> where other impervious surface regulations are located. <br /> 74 The Commercial-Industrial Land Use category is a discrete category on the Land Use and Zoning Matrix <br /> contained in Appendix F of the County's Comprehensive Plan but it is not described as a separate category and is <br /> not consistently referred to in the UDO. Staff believes this is an oversight that may have occurred in the late 1980's <br /> or 1990's when the Comprehensive Plan was changed to include a combined Commercial-Industrial Activity Node <br /> category on the Land Use Element Map and on the matrix,but other necessary updates were not made. Staff <br /> considers this to be a"clean-up"or"housekeeping7'amendment to reflect intent and interpretation which will <br /> provide clarity and conciseness to the regulations. Note that a Comprehensive Plan amendment is also proposed as a <br /> separate item to fix these inconsistencies. <br /> 75 Staff is recommending that the UDO explicitly state how the impervious surface acreage limitations are calculated <br /> in order to avoid confusion. The stated method(using ggigd impervious surface calculations)is how staff tracks the <br /> acreage limits. For example,there has been confusion in the past over whether a non-residential use on a <br /> hypothetical 37-acre parcel in the HYCO-PW would be encumber all of the impervious surface limit of 37 acres. <br /> Staff's interpretation and administration has always been that the limit pertains to actual impervious surface,not <br /> parcel size. This suggested amendment makes the calculation method clear. <br /> 76 Impervious Surface Ratio requirements in Section 63.7 are suggested to be relocated to this Section of the UDO <br /> where other impervious surface regulations are located. <br /> Orange County,North Carolina—Unified Development Ordinance Page 4-9 <br />