HomeMy WebLinkAboutDrain Narrative 2024-0306
WENTWORTH CIVIL
ENGINEERS LLC
177 West Town Street
Lebanon, Connecticut 06249
Tel. (860) 642-7255
Fax. (860) 642-4794
Email: Wes@WentworthCivil.com
March 6, 2024
Sara Lundy, Chair
Montville Planning & Zoning Commission
310 Norwich-New London Tpke
Uncasville, CT 06382
Re: Black Ash Estates Re- Subdivision
Black Ash Rd. and
Old Colchester Rd.
Montville, CT
Dear Sara:
I am writing to you in regards to your above referenced 13 lot subdivision.
The subdivision layout has been designed to minimize potential onsite and
offsite drainage impacts due to development.
The lot design encourages overland sheet flow in three major directions (see
attached Overall Drainage Map for reference). The western portion of the site
slopes to a large onsite wetland system that drains southerly via culverts under
Black Ash Road. Similarly, the central portion of the site also drains to a
large onsite wetland that also discharges southerly via culverts under Black
Ash Road. The eastern portion of the site slopes southeasterly towards
abutting properties that front on the north side of Black Ash Road.
Design elements included in the creation of this development include
minimizing impervious areas, maximizing wooded areas, keeping wetlands
and upland review areas undisturbed and in their existing vegetated state.
Other low impact design elements include and encouraging runoff via
overland sheet flow and maximizing infiltration within these areas. All
proposed roof downspouts are to discharge into underground infiltration
drywells. All storm runoff from driveway areas are to be treated in infiltration
trenches or rain gardens. These Low Impact Development design features
will treat pollutants, maximize infiltration and discourage point discharges of
storm water runoff.
The re-subdivision design plans include a site specific erosion and
sedimentation control plan, design calculations for rain gardens and
infiltration trenches, and a long term operation and maintenance plan for these
design elements.
It is my professional opinion that the development of this project as designed
will not result in any significant impacts to drainage flows onsite or offsite.
If you have any comments or questions, please do not hesitate to contact me.
Sincerely,
Wesley J. Wentworth
P.E. , Soil Scientist
WENTWORTH CIVIL
ENGINEERS LLC
TEL. (860) 642-7255
FAX (860) 642-4794
web: wentworthcivil.com
177 WEST TOWN ST.
LEBANON, CT 06249W