Erosion, Flood, Stormwater & Watershed Standards 12.6 Water Supply Watershed Protection Regulations
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2. Redevelopment or reconstruction of existing development is allowed if the rebuilding activity does not have a net increase in built-upon area or provides equal or greater storm water control than the previous development as allowed by this section, except that there are no restrictions on single-family residential development. 3. A deeded single-family lot owned by an individual prior to the date indicated for each water supply watershed in the table in Section 12.6.1.F.1 above, provided it is developed for single-family use. 4. A non-conforming lot of record, not contiguous to any other lot owned by the same party, provided it is developed for single-family use. 5. Any lot or parcel created as part of a family subdivision on or after the date indicated for each water supply watershed in the table Section 12.6.1.F.1 above, provided it is developed for one single-family detached residence and if it is exempt from the subdivision regulations. G. Calculation of Impervious Surface/Built-Upon Area: For the purpose of calculating the impervious surface/built-upon area, total project area shall include total acreage in the tract on which the project is to be developed. Impervious surface area shall include, but not be limited to, all existing public and private streets, proposed public streets, sidewalks, driveway, rooftops, parking lots, patios, and all other impervious and partially impervious surfaces, including crushed aggregate base course (CABC) and gravel within the development and any material which reduces and prevents absorption of stormwater into previously undeveloped land. Impervious surface area does not include wooden slatted decks, the water area of a swimming pool, or pervious or partially pervious paving material to the extent that the paving material absorbs water or allows water to infiltrate through the paving material and underlying substrate. Other pervious materials may be excluded from the calculation of impervious area as provided by the North Carolina Environmental Management Commission Manual as amended. Impervious surface/built-upon area calculations shall be made based on the total acreage of built-upon area within a proposed development, divided by the total acreage of the lot area. Density calculations for expansions shall be based on the total acreage of built-upon area proposed for expansion, divided by the total acreage of the lot area proposed for expansion, minus the area of existing development. “Existing development” is any development or built upon area which existing prior to the dates listed in 12.6.1 F1 (above) or August 1, 1998 (15A NCAC 2B .0711 (2A)), which is earlier. Calculation of BUA % shall be conducted in accordance with 15A NCAC 2B .0624 (4b). Examples are provided below. 1. New Construction BUA Calculation: Built-Upon Area (%)=Proposed Built-Upon Area Acreage/Total Project Site Acreage x 100
Example:
A proposed 50-acre site will be developed to include 12-acres of built-upon area. Calculation of built-upon area for the site would be:
% Built-upon Area = (12 acres)/(50 acres) x 100 = 24%
2. Development/Redevelopment of Existing BUA Calculation Options:
Option A: Addition of a New and Separate BUA on an Existing BUA Developed Property Built-Upon Area (%) = [Built-Upon Area Increased by Redevelopment/(Total Parcel Acreage-Total Existing or Adjusted BUA Acreage)] x 100
Town of Wake Forest Unified Development Ordinance – July 19, 2022
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