HomeMy WebLinkAboutSW4211201_Stormwater Narrative_20220113CSD
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PROJECT NARRATIVE
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Supporting Calculations
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The Grove Subdivision —Access Road Construction
INTRODUCTION
11/22/2021
Mr. Richard Stockett, developer and authorized agent of Judy Cooke Abee (property owner, is proposing
to subdivide lots on a 67.15-acre property on Piney Grove Road in Forsyth County, NC. Mr. Stockett is in
the process of obtaining a land grading permit for the construction of an access road to proposed lots that
will be 10.0 acre lots or bigger.
EXISTING CONDITIONS
The existing parcel is mostly wooded with rolling terrain. An existing house on the property will be
demolished to construct the new access road. Areas of concentrated flows are intermittent to ephemeral;
however, no impacts to streams is anticipated. There are no regulated wetlands located within the road
construction area and within the new lot boundaries.
HYDROLOGY & HYDRAULICS
The proposed access road will be drained by roadside, vegetated channels. Drainage areas to each section
of channel were delineated and flows estimated for hydraulic analysis. The appropriate stabilization
measure was proposed based on the results of the channel analysis. The project shall also consist of two
piped crossing that were designed for estimated discharges by methods outlined in FHWS HDS-5. The
channel analysis and pipe data sheets are attached to this narrative.
EROSION AND SEDIMENT CONTROL
The use of erosion control matting and blankets will be key to minimizing sedimentation. Rock check dams
with storage in channels will be utilized for sediment control while wattles and matting will be utilized for
erosion control in channels. The roadway plans include the erosion and sediment control measures. For
the steeper channels, the rock check dams will likely stay in place and maintained as a permanent erosion
control measure to slow concentrated flows. Permanent soil reinforcement matting will be required in
several locations (see plans and channel analysis worksheets).
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