SW6240401_Stormwater Narrative_20240403

5245 Red Hill Church Rd
1-1 FLEET TEMPLE Coats, NC27521
ENGINEERING 910.658.2446
[e-mail]
PLLC Firm License P-2357
Wellons Realty, Inc. - Maple Drive
Duke Township, Harnett County, NC
02.27.2024
PROJECT NARRATIVE
Project & Site Description
The purpose of this project is to develop a 4 lot residential subdivision.The property is
existing undeveloped lots. Existing topography drains to the northeast at slopes of
approximately 1 to 10% to un-named tributaries to Juniper Creek. No wetlands exist
on the property.
Adjacent Property
The land uses in the surrounding areas are wooded/undeveloped and residential
subdivision.
Soils
The soils in the project area consist of NoB (Norfolk loamy sand, 2 to 6% slopes) and
VeD (Vaucluse gravelly loamy sand, 8 to 15% slopes).
NoB is categorized as well drained, moderately permeable, and is well suited to most
urban and recreational uses, and VeD is categorized as well drained, moderately
slowly permeable, and is moderately suited to most urban and recreational uses.
Planned Stormwater Management, Erosion and Sediment Control
As shown on the Erosion Control Plan the project will be controlled and stabilized with
diversion berms, silt fence, and rock check dams.. Diversion berms will be constructed
from topsoil graded from the site and will be backed with silt fence where needed.All
measures will be constructed and maintained to NCDEQ& Harnett County standards
and requirements.
After erosion control measures are removed. Surface waters from the lot areas will
drain via grassed swalesto an existing road storm system which will convey the runoff
from the property. Impervious areas on the lots will surface drain through the grassed
yard areas over the contours of the Site. Project impervious percentage is limited to
24%. Proposed impervious limits as follows:
IMPERVIOUS AREA CALCULATIONS:
TRACT AREA: 63,690 SF
IMPERVIOUS AREA ALLOWED: 24% MAX (LOW DENSITY)
63,690 SF X 0.24=15,286 SF MAXIMUM ALLOWABLE IMPERVIOUS
IMPERVIOUS AREA BY DESIGN
15,000 SF(3,750SF/LOT X 4 LOTS)
15,000 SF TOTAL IMPERVIOUS BY DESIGN (23.6%)