HomeMy WebLinkAbout26IWC6 - Drainage Report
STORMWATER MANAGEMENT REPORT
PREPARED FOR
LINDO CONSTRUCTION, LLC
90 Maple Ave.
Montville, Conn.
BY
WENTWORTH CIVIL ENGINEERS, LLC
177 WEST TOWN STREET
LEBANON, CONNECTICUT 06249
DATE: 4-06-20
REV. 11-09-20
REV. 2-03-21
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WENTWORTH CIVIL
ENGINEERS LLC
177 West Town Street
Lebanon, Connecticut 06249
Tel. (860) 642-7255
Fax. (860) 642-4794
Email: Wes@WentworthCivil.com
WATER QUALITY VOLUME CALCULATIONS
PREPARED FOR LINDO CONSTRUCTION, LLC
90 MAPLE AVE.
MONTVILLE, CT
DATE: 5-20-20
REV. 2-03-21
AREA = 339,607 SF
IMPERVIOUS AREA = 128,502 SF : I = .38
WQV=1”((.05+(.9)(.38)) x 339,607 sf / 12” = 11,094 cf
FROM STORMWATER CALCULATION POND DESIGN:
DEPTH OF WQV (MINIMUM BASIN BOTTOM TO LOW FLOW
OUTLET): 1.7 ft
VOLUME PROVIDED BELOW LOW LEVEL OUTLET: 14,000 cf
VOLUME PROVIDED ABOVE LOW LEVEL OUTLET AND BELOW
OUTLET STRUCTURE TOP OF FRAME: 40,000 cf
SEDIMENT FOREBAY (10% WQV): 1,109 cf (MIN.)
SEDIMENT FOREBAY VOLUME PROVIDED: 2,500 cf
Treatment methods of first 1” rainfall from impervious areas (WQV) that falls on
proposed roof, walk and pavement areas will be collected by drainage system and
discharged to the onsite Infiltration / Detention Basin and stored during small
storms of 1” or less. This volume of water will percolate into the bottom of the
infiltration basin over a period up to 24 hours.
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