Wake Forest Unified Development Ordinance - July 2022

Erosion, Flood, Stormwater & Watershed Standards 12.6 Water Supply Watershed Protection Regulations


watershed protection and provide greater development flexibility for properties in Water Supply Watershed Protection Overlay Districts by allowing the transfer of impervious area "credits" across parcels. B. Limitations : In order to qualify for an impervious surface averaging allowance: 1. All other requirements of this ordinance must be met; 2. Must be in compliance with NCS 143-214.5; 3. The property from which the impervious area credits are taken must not have been used in the calculation of impervious area allowance for an existing or approved development project; 4. No parcel for which a watershed variance has been granted, or would be required, may be included as a part of a parcel pair; and 5. The development proposal for the parcel pair shall conform to the intent and requirements of this section, shall be consistent with the orderly and planned distribution of development throughout the community, and shall assure protection of the public interest. C. Location 1. Parcels from which development “credits” are taken must be loc ated in a Watershed Protection Overlay District. 2. Parcels to which development “credits” are applied must be located within the same water supply watershed as the paired-parcel. D. Combined Impervious Surface Area Limit: The total amount of development (impervious surface area) allowed for the paired parcels taken together cannot exceed the amount of development that would be allowed if the parcels were developed separately. E. Overall Density Limit: Overall density of the paired-parcel, averaged-impervious surface development, calculated either by dwelling units per acre or built upon area shall not exceed the density that would be allowed if the parcels were developed separately. F. Runoff Volume: Peak flow must be controlled on the developing lot or project using the acreage or area of the developing lot or project only, so as to minimize drainage impact on downstream properties. G. Stormwater Flow: Plans shall be designed to: 1. Minimize stormwater runoff impact to the receiving waters by minimizing concentrated stormwater flow; 2. Maximize the use of sheet flow through vegetated areas and vegetated conveyances; 3. Minimize impervious surface areas; 4. Locate development away from surface waters and drainage ways to the maximum extent practicable; and 5. Where concentrated flow is unavoidable, convey stormwater from developed areas by vegetated swales to the maximum extent practicable. H. Procedure for Approval 1. An impervious surface averaging allowance shall be conveyed as part of a Development Permit, in accordance with Section 15.6.1. Only owners of both of the paired parcels may submit an application for a development using an impervious surface averaging allowance. 2. Included with the Development Permit application shall be a site plan, registered plats/sealed boundary survey for both properties, a description of both

Town of Wake Forest Unified Development Ordinance – July 19, 2022


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