Agenda - 11-21-2011 - C5 - Laserfiche WebLink

Browse Search

Article 4: Overlay Zoning Districts Section 4.2: Watershed Protection 333 (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.76 73 Impervious Surface Ratio requirements in Section 6.3.7 are suggested to be relocated to this Section of the UDO where other impervious surface regulations are located. 74 The Commercial- Industrial Land Use category is a discrete category on the Land Use and Zoning Matrix contained in Appendix F of the County's Comprehensive Plan but it is not described as a separate category and is not consistently referred to in the UDO. Staff believes this is an oversight that may have occurred in the late 1980's or 1990's when the Comprehensive Plan was changed to include a combined Commercial - Industrial Activity Node category on the Land Use Element Map and on the matrix, but other necessary updates were not made. Staff considers this to be a "clean -up" or "housekeeping" amendment to reflect intent and interpretation which will provide clarity and conciseness to the regulations. Note that a Comprehensive Plan amendment is also proposed as a separate item to fix these inconsistencies. 75 Staff is recommending that the UDO explicitly state how the impervious surface acreage limitations are calculated in order to avoid confusion. The stated method (using actual impervious surface calculations) is how staff tracks the acreage limits. For example, there has been confusion in the past over whether a non - residential use on a hypothetical 37 -acre parcel in the HYCO -PW would be encumber all of the impervious surface limit of 37 acres. Staff's interpretation and administration has always been that the limit pertains to actual impervious surface, not parcel size. This suggested amendment makes the calculation method clear. 76 Impervious Surface Ratio requirements in Section 6.3.7 are suggested to be relocated to this Section of the UDO where other impervious surface regulations are located. Orange County, North Carolina — Unified Development Ordinance Page 4 -9 IMPERVIOUS TABLE 4.2.6: • • . REQUIREMENTS IMPERVIOUS DISTRICT • POND REQUIREMENTS • 70% ISR in Economic Development73, 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 > 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 ENO-PW structural BMPs if ISR > 12 %; AND B ACK -PW 12% ISR for all other non - residential uses outside of Commercial and /or Commercial- Industrial74 and/er IFIdustr+al 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 0%). 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). [11 BMPs cannot be used to satisfy watershed impervious surface requirements. 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). HAW-PW 24% impervious surface limit. [1] BMPs cannot be used to satisfy watershed impervious surface requirements. PW [1] BMP's as mandated by the Stormwater Management Program for Lands within the Neuse River Basin are allowed. NOTE: Non - residential use impervious surface acreage limits in watersheds with such limits are calculated using the actual amount impervious surface for non - residential uses throughout the watershed, not by the overall number of acres of a non- residential parcels located in a particular watershed . 75 (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.76 73 Impervious Surface Ratio requirements in Section 6.3.7 are suggested to be relocated to this Section of the UDO where other impervious surface regulations are located. 74 The Commercial- Industrial Land Use category is a discrete category on the Land Use and Zoning Matrix contained in Appendix F of the County's Comprehensive Plan but it is not described as a separate category and is not consistently referred to in the UDO. Staff believes this is an oversight that may have occurred in the late 1980's or 1990's when the Comprehensive Plan was changed to include a combined Commercial - Industrial Activity Node category on the Land Use Element Map and on the matrix, but other necessary updates were not made. Staff considers this to be a "clean -up" or "housekeeping" amendment to reflect intent and interpretation which will provide clarity and conciseness to the regulations. Note that a Comprehensive Plan amendment is also proposed as a separate item to fix these inconsistencies. 75 Staff is recommending that the UDO explicitly state how the impervious surface acreage limitations are calculated in order to avoid confusion. The stated method (using actual impervious surface calculations) is how staff tracks the acreage limits. For example, there has been confusion in the past over whether a non - residential use on a hypothetical 37 -acre parcel in the HYCO -PW would be encumber all of the impervious surface limit of 37 acres. Staff's interpretation and administration has always been that the limit pertains to actual impervious surface, not parcel size. This suggested amendment makes the calculation method clear. 76 Impervious Surface Ratio requirements in Section 6.3.7 are suggested to be relocated to this Section of the UDO where other impervious surface regulations are located. Orange County, North Carolina — Unified Development Ordinance Page 4 -9