Conservation Commission - 902 (06/06/2024)

BASIN TOP ELEV.: 131.50 
— T Se 
EE
SPILLWAY ELEV.: 131.00 
—
1.4°+ 
OF
FREEBOARD
TOP OF GRATE
ELEV.: 131.00 |
—<——_—_—
100—YR ELEV.: 130.06 
\
SO-YR ELEV.: 128.42 
————
25-YR ELEV.: 127.92
LOW-LEVEL 2” DIA.
ORIFICE ELEV.: 128.50
35,5004 C.F. OF WQV
_ 
1,350+ C.F. OF WQV PROVIDED 
PROVIDED UP TO 
a
1O—YR ELEV.: 129.17 
UP TO TOP OF RIPRAP BERM 
LOW-LEVEL ORIFICE 
yo
(103% OF WQV) 
(267% OF WQv) 
ELEVATIONS 
FOR
5-YR ELEV.: 128.80 
THE ENTIRE
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BASIN FOR THE
a 
2—YR ELEV.: 128.46 
a 
Aa 
5 
7 
1-YR THROUGH
ee 
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100-YR STORM
1-YR ELEV.: 128.10 
———aZ 
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WQV SEDIMENT FOREBAY 
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MANAGEMENT BASIN 
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BASIN BTM. ELEV.: 127.00 
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APPROX. 15” HDPE 
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PIPE INLET
APPROX. 12” HDPE
OUTLET CONTROL ——= 
PIPE OUTLET
STRUCTURE
/\
BASIN 1B CROSS—SECTION DEPICTING STORMWATER ELEVATIONS
HORIZ SCALE: 1°=4’, VERT SCALE: 1”=1’
DATE: 
SCALE: 
PLAN PREPARED BY:
MAY 21, 2021 | AS NOTED 
BASIN CROSS-SECTION 
D) G © INDIGO LAND DESIGN, LLC
JOSEPH WREN, P.E.
DRAWN BY: 
CHKD BY: 
PREPARED FOR 1721, LLC 
eRe 
CT REG. NO. 21090
RG 
JW 
430 MOHEGAN AVE. PARKWAY & 23B OLD NORWICH RD. 
40 ELM STREET, 2ND FLOOR
OLD SAYBROOK, CT 06475
TAX MAP 76 LOTS 10164 & 5600
DWG. NO.: 
SHEET NO.: 
PHONE: (860) 388-9343
BCS-1 
1 
of 
2 
by D 
WEB: INDIGO-LAND.COM

\ 100-YR ELEV.: 128.98
Re 
BASIN TOP ELEV.:
130.50
TOP OF GRATE
ELEV.: 10.00 |
SPILLWAY ELEV.:
1.5’+ 
OF
FREEBOARD
6.0’
ELEVATIONS FOR THE
ENTIRE BASIN FOR THE
1-YR THROUGH 100-YR
STORM EVENTS (TYP.)
BASIN BTM. ELEV.:
PIPE INLET
Yeh
50-YR ELEV.: 128.42
LOW-LEVEL 2” DIA.
25-YR ELEV.: 127.92 
ORIFICE ELEV.: 127.00
20,100+ C.F. OF WQV
PROVIDED UP TO
LOW-LEVEL ORIFICE
(508% OF WQV)
10-YR ELEV.: 127.20 
'
i L 
\ 
VA STORMWATER
5—YR ELEV.: 126.56 
4,000+ C.F. OF WQV PROVIDED 
i /
UP TO TOP OF RIPRAP BERM 
|
(101% OF WQV)
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| 
LA
2—-YR ELEV.: 125.74 
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1-YR ELEV.: 125.18 
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—— 
WQV SEDIMENT FOREBAY 
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STORMWATER 
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130.00 
—
6.5"
OUTLET CONTROL ——=
STRUCTURE
PIPE OUTLET
\/\
BASIN 1C CROSS—SECTION DEPICTING STORMWATER ELEVATIONS
HORIZ SCALE:
1°=4’, VERT SCALE: 1°=1’
BASIN CROSS-SECTION
DATE: 
SCALE:
MAY 21, 2024 
AS NOTED
DRAWN BY: 
CHKD BY:
RG 
JW
DWG. NO.: 
SHEET NO.:
BCS-1 
2 of 
2
PREPARED FOR 1721, LLC
430 MOHEGAN AVE. PARKWAY & 23B OLD NORWICH RD.
TAX MAP 76 LOTS 10164 & 5600
WATERFORD, CONNECTICUT
40 ELM STREET, 2ND FLOOR
OLD SAYBROOK, CT 06475
PHONE: (860) 388-9343
Smart Growth
by Design 
J)
PLAN PREPARED BY:
INDIGO LAND DESIGN, LLC
JOSEPH WREN, P.E.
CT REG. NO. 21090
WEB: INDIGO-LAND.COM