SW4211101_Stormwater Narrative_20211221

STORMWATER MANAGEMENT NARRATIVE
BARROW FARMS SUBDIVISION
Phase 1 & 2
Forsyth County, NC
CLIENT:
CYD-BARROW FARMS, LLC
CONTACT: WILL YEARNS
7349 W. FRIENDLY AVE. STE H
GREENSBORO, NC 27410
WYEARNS(a,MYGRANVILLEHOME.COM
336-202-8514
December 21, 2021
Project No. 20-066
Jordan D. Young, P.E.
Green Mountain Engineering, PLLC
j ordan@greenm o untainengineers.com
7A Wendy Court
Greensboro, 27409
[phone]

Introduction
The Barrow Farms subdivision is proposed to be located in Forsyth County. It consists of developing
approximately 30.50 acres on a previously undeveloped 34.1 acre site. This project is proposing 33 lots
which is a lot density of 0.97 lots/acre as well as 12.42% BUA. This project is classified as a low density
project. Therefore, the project must meet the low density requirements of section 15A NCAC 02H .1003
of the NCDEQ stormwater manual. The site generally consists of one main drainage point where water
leaves the site through an existing channel located at the North West corner of the site, that eventually
discharges to Belew Creek. This discharge point has a drainage area of total project area, 34.1 acres. The
site proposes 4.24 acres of built upon area, broken down to 1.51 acres from streets and 2.726 acres from
houses and driveways (3,599 sf/lot).
Requirements
The project is proposing less than 24% built upon area, and less than 2 units/acre therefore the site is
considered low density and must meet all of the water quality low density ordinance and design manual
requirements.
Chapter E-1 of the NCDEQ Stormwater Design Manual states the following requirements for "Low
Density Projects:
15A NCAC 2H .1003(2)(b): DISPERSED FLOW. Projects shall be designed to maximize dispersed
flow
through vegetated areas and minimize channelization of flow.
This project utilizes dispersed flow through vegetated conveyances to the maximum extent.
15A NCAC 2H .1003(2)(c): VEGETATED CONVEYANCES. Stormwater that cannot be released as
dispersed flow shall be transported by vegetated conveyances. A minimal amount of non -vegetated
conveyances for erosion protection or piping for driveways or culverts under a road shall be allowed by
the permitting authority when it cannot be avoided.
The 2 storrnwater discharges that leave the site are discharge through vegetated areas.
Stormwater piping only used when necessary to cross roads.
15A NCAC 2H .1003(4): VEGETATED SETBACKS. Vegetated setbacks shall be required adjacent to
waters as specified in the storrnwater rules to which the project is subject pursuant to this Section, in
addition to the following requirements applicable to all vegetated setbacks:
There are no surface waters in the form of creeks or streams.
15A NCAC 2H .1003(5): STORMWATER OUTLETS. Stormwater outlets shall be designed so that
they do not cause erosion downslope of the discharge point during the peak flow from the 10-year storm
event as shown by engineering calculations.
The discharge points will have rip rap energy dissipaters to not cause erosion.
15A NCAC 21-1.1003(7): DEED RESTRICTIONS AND PROTECTIVE COVENANTS. The permittee
shall record deed restrictions and protective covenants prior to the issuance of a certificate of occupancy
to ensure that projects will be maintained in perpetuity consistent with the plans and specifications
approved by the permitting authority.
The "Low Density Residential Subdivision Deed restrictions & protective Covenants "form is
included with this submittal.