Street Design Manual

3.2.1 C - Sensitive Area Residential Street Sensitive Area Residential Streets are installed in places where natural runoff water drainage is preferred, and traffic volume is relatively low. Typically, this type would be used in an agricultural or primarily low-density residential setting. Sidewalk is required on both sides of the street. Sensitive Area Residential Streets are conducive to the use of GSI practices. Per UDO Article 9.5, where development impervious cover is more than 24% in any Secondary Water Supply Watershed Protection Area, the first inch of rainfall from the streets must be managed with use of GSI, unless a design exception is approved by the City. In these Protection Areas, permeable pavement may be appropriate for multiuse trails, bioswales and bioretention areas may be appropriate as alternatives to conventional drainage ditches, and combinations of trees and native vegetation may be appropriate as an alternative to conventional tree lawns.

Raleigh Street Design Manual – Page 11