SW3231201_Stormwater Narrative_20240102

American Engineering Associates-Southeast, PA.
8008 Corporate Center Drive,Suite 110
AC\
AMERICharlotte,NC
CAN 28226
OFFICE: 5.2438
Engineering www.American-EA.com
The Shops at Prescot Village—Waxhaw, NC 28173
Stormwater Pollution Prevention Plan
Site Narrative
The Widewaters Group intends to construct 4 commercial buildings on a 13.46-acre property located on
portions of two parcels located on Prescot Glen Parkway in Waxhaw, NC.The parcel ID#s are 06165003P
and 06165003A.The property is zoned CC(Corridor Comercial) and will support the proposed
commercial building use. The site is currently vacant with no impervious area. Prescot Glen Parkway
runs along the northern boundary of the site, NC-16 runs along the eastern boundary of the site and
Pine Oak Road runs along the southern boundary of the site.
The site currently has a driveway connection to NC-16 and a driveway connection to Prescot Glen
Parkway.The proposed development will connect to these two driveways and will propose an additional
driveway along Prescot Glen Parkway at the existing roundabout. Water services to each of the
proposed commercial buildings will be provided from the existing 8" water main along Prescot Glen
Parkway.The sewer services will connect to the existing 8" sanitary sewer in Prescot Glen Parkway.
The construction of The Shops at Prescot Village will disturb 15.63 acres of land.The existing drainage
pattern primarily runs from the south to north throughout the site.The existing site drainage collects in
a basin on the site and discharges to the north, across Prescot Glen Parkway,toward Twelvemile Creek.
Development of the site will preserve existing drainage patterns by routing stormwater to a proposed
wet detention pond on the northern side of Prescot Glen Parkway.The proposed wet pond will capture
a portion of the drainage from Prescot Glen Parkway in addition to the site drainage.The site is subject
to post construction ordinance requirements because the proposes more than 20,000 square feet of
Built-Upon Area (BUA).
Erosion and sediment control requirements are to be met through sediment basins, silt fence and inlet
protection. The post construction stormwater requirements are to be met with a proposed wet pond.
The wet pond has been designed to provide water quality treatment for the first inch of rainfall and pre
vs post peak attenuation for the 2-year and 10-year 24-hour storm events.The emergency spillway has
been designed to pass the 50-year storm.The pre development and post development discharge rates
are summarized in the table below.
Pre vs Post Discharge Rates Summary Table
Hyd. Hydrograph Inflow Peak Outflow(cfs) Hydrograph
No. type hyd(s) Description
(origin) 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr
1 SCS Runoff 12.93 21.27 47.70 66.18 81.65 98.48 Pre Development
2 SCS Runoff 49.63 65.42 108.55 135.41 156.93 179.67 Post Development
3 Reservoir 2 2.565 5.962 45.83 85.30 116.91 144.29 Wet Pond