SW6210501_1736-Stormwater Narrative_20210518

Rolling Springs Section 7 Storm Water Narrative
The subject site is a currently undeveloped portion of the existing Rolling Springs
Subdivision in Harnett County, NC. The site is being developed for single-family
residential homes. The current stormwater drainage at this site terminates at the
existing wetlands that cross through the middle of the site.
The site meets the qualifications of a low density development. The average density for
the development is 1.13 units/acre compared to the maximum of 2 units/acre to satisfy
the requirements set forth by NCDEQ. The roads within the development will convey
storm water via grassed roadway ditches. The grassed roadway ditches will terminate
near the wetlands crossing the middle of the site. Swales that terminate at the wetlands
provide flow velocities less than the allowable 2.0 fps. The roads in the subdivision are
designed in accordance with NCDOT standards.
Based on our study and review of the NCDEQ BMP manual and NC Session Law 2006-
246 Section 9 paragraph c, Rolling Springs Section 7 meets and/or exceeds the
requirements and intent for low density development.
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