Secondary and Cumulative Impacts Master Management Plan - 2014

Article 3 Zoning Districts 3-74 WSO, Water Supply Watershed Overlay District

Overlay District

Minimum Lot Area (sq. ft.)

Maximum Density (lots/acre)

Max. Impervious Surface

WSO-2NC [1] WSO-3CA [1] WSO-3NC [2]

40,000 40,000 20,000

1 1 2

12% 12%

24% [1] In WSO-2NC and WSO-3CA districts, residential lots of at least 40,000 square feet in area and residential lots in a cluster subdivision, open space subdivision or existing Consolidated Open Space Development with an overall lot density no more than one lot per acre are not subject to impervious surface coverage limits except as required by the underlying zoning. For all other residential lots and for nonresidential developments in those districts, impervious surface coverage may not exceed 12% of the total area of the site, as designated on the site plan. [2] In WSO-3NC districts, residential lots of at least 20,000 square feet in area and residential lots in a cluster subdivision, open space subdivision or existing Consolidated Open Space Development with an overall lot density of no more than 2 lots per acre are not subject to impervious surface coverage limits except as required by the underlying zoning. For all other residential lots and for nonresidential developments in those districts, impervious surface coverage may not exceed 24 percent of the total area of the site, as designated on the site plan. (C) WSO-4P Districts In a development served by a curb and gutter system, residential lots of at least 20,000 square feet in area and residential lots in a cluster subdivision, open space development or existing consolidated open space development with an overall lot density no more than 2 lots per acre, are not subject to impervious surface coverage limits except as required by the underlying zoning. For all other residential lots and for nonresidential developments, the following standards apply: (a) WSO-4P1 In the WSO-4P1 district, impervious surface coverage may not exceed 24 percent of the total area of the site, as designated on the site plan. (b) WSO-4P2 In the WSO-4P2 district, impervious surface coverage may not exceed 30 percent of the total area of the site, as designated on the site plan. In a development not served by a curb and gutter system, residential lots of at least 15,000 square feet in area and residential lots in a cluster subdivision, open space development or existing consolidated open space development with an overall lot density no more than 2 lots per acre, are not subject to impervious surface coverage limits except as required by the underlying zoning. For all other residential lots and for nonresidential developments, impervious surface coverage may not exceed 30 percent of the total area of the site, as designated on the site plan. (3) Engineered Stormwater Control Structures Engineered stormwater control structures must meet design guidelines of the State Division of Water Quality, or its successor agency. Responsibility for maintenance of all permanent infiltration, retention, and detention control measures and facilities, after site development is completed, rests with the owner of the use. When designed in accord with the guidelines of the State Division of Water Quality, or its successor Commentary: Curb and gutter are limited in water supply watersheds. See Sec. 8-32-18. (2) Without Curb and Gutter Development within WSO-4P districts must comply with the following standards whenever they are more restrictive than those of the underlying zoning district. (1) With Curb and Gutter

Wake County Unified Development Code 3-57