HomeMy WebLinkAbout22SUB4 Drainage Rpt Dated 101022Provost & Rovero, Inc.
Civil Engineering • Surveying • Site Planning • Structural • Mechanical • Architectural Engineering
P.O. Box 191 Telephone (860) 230-0856
57 East Main Street Fax (860) 230-0860
Plainfield, CT 06374 www.prorovinc.com
October 10, 2022
Harry B. Heller
Heller, Heller & McCoy
736 Norwich-New London Turnpike
Uncasville, CT 06382
RE: Watch Hill Builders, LLC – 3 Lot Subdivision – Old Colchester Road – Montville, CT
P&R Job No. 213075
Dear Mr. Heller:
In preparing the site development plans for the above referenced subdivision, I have also reviewed the field
conditions on and around the subject property to review the potential for storm drainage impacts associated
with the proposed construction of the two driveways and three houses. Additionally, I have attached sizing
calculations for rain gardens to be installed with the construction of houses on each of the three lots. These
rain gardens will provide for water quality renovation through stormwater infiltration and bioremediation
with the proposed plantings. While not specifically designed to provide stormwater detention or peak flow
control, these rain gardens will provide some degree of peak flow reduction by retaining the first inch of
runoff from the impervious roof surfaces.
The project frontage on Old Colchester Road includes a gentle swale off the edge of pavement which conveys
roadway runoff to catch basins located easterly and westerly of the proposed driveways. Each driveway will
include a culvert adjacent to the road to maintain positive drainage flow to these catch basins. The proposed
lot and driveway grading will not have a significant effect on drainage patterns which would impact Old
Colchester road or the existing catch basins.
If you have any questions or need additional information, please do not hesitate to contact us at your
convenience.
Sincerely,
David J. Held, P.E., L.S.
Provost & Rovero, Inc.