Storm Water Management Plan 3-28-07
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
STORM WATER MANAGEMENT PLAN
FOR
LOTUS WOODS
Chanhassen, Minnesota
June 26,2006
Revised September 14, 2006
Revised March 14, 2007
Revised March 28, 2007
Otto Project No. 2-05-0190
CrrvOF CHANHASSEN
RECEIVED
MAR 3 0 2007
Prepared for:
Ron Karon
CHANHASSEN PLANNING DEPT
Prepared by:
Otto Associates, Engineers & Land Surveyors, Inc.
ITO
SSOC1ATES
Engineers and Land Surveyors I Inc.
9 WEST DMSION STREET - BUFFALO, MN 55313 - (763) 682-4727 - FAX (763) 682-3522
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
SUMMARY
Runoff (cfs)
AREA TO WEST Ii'Ei,.:'!. .i,........;';';
.~"...,.. ....
Existing (El, E2, E3) 1.39 4.39 9.94
Proposed (pI, P2, P3, N, P5, P6) 1.09 4.36 9.73
AREA TO SOUTHEAST I,....>. ';'.:;" .; ,i;;.;~;lO':Year:'i;{.i)t;; :.:;,,:;;Ul 00 'Year,/ :--,:,:
,"
Existing (E4) 0.48 1 .26 2.64
Proposed (P7) 0.24 0.69 1 .50
AREA TO LAKE I'iii.!' ".:; 1'"";,;,,:,,
Existing (E5) 1.39 4.78 11.33
Proposed (P8) 1.43 4.60 10.56
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
@~~C
-">,.;:',',.
~:,:.:::::-,._::,:"~...,,.:.
...:....-,:.:..'.,::..::.::.:.-,.,.:..:..'.::"..:." >.
~ '18' ""
'>':/:,', :-,-'.:' '., ,'..
'. " -,.,
.-,:.:......-:.".,:.....,... .. '
Existing Area E1
@~c""'.'"
;::t':-,}>::,~:'iJ7.i:;,:;,<:;
,', " : .::"-,,,: ,.'-- -" <.. :..',' :~ '. ',' ,'.
':-:..,.....-.' .'..,..... '.'.'
.,..,~,.2'S...,..~.:.>.
",:-,>'-:,J.< .:'. ,",', ~ -,_,-.,: ~..
'.. .. .. .
,v.. ',....t....'.
~,-. ,'. ," '. ,', .:.:
Existing Area E2
@",
\":",:-'" "
"";- ',- _.:::- ,",.. -'...< "'~". -.'
~'~"'3"S""''.
""."
Existing Area E3
<.:>~..4.'....S"'..,~>.~....
,""- -, ", ",-
."', ....
-",-, ,---
:~ ',:- .. ',' - ' "/ -: .. ,
.~.. '" ",... " "... '-, .,"...
,":0',,', .......,
',""--:""':""','- ,;..,
Existing Area E4
@'"
.. - -.;..... ,,-.:',':-_.
<-:_-' ' -,' '.:
\5S','"
':-r".,:,::>. .._;':'i:<,,_i'
";:'i"",;;""",""',
Existing Area E5
BA~
Drainage Diagram for 05-0190 EXISTING
Prepared by Otto Associates, Inc. 3/29/2007
HydroCAD@7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
~
Area to West
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 1
3/29/2007
Subcatchment 1S: Existing Area E1
0.23 cfs @ 12.27 hrs, Volume=
0.024 af, Depth> 0.46"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.130
0.050
0.440
0.620
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
68 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
28.1 230 0.0639 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 2
3/29/2007
Subcatchment 2S: Existing Area E2
Runoff =
0.65 cfs @ 12.07 hrs, Volume=
0.042 af, Depth> 0.39"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.100
0.030
0.960
0.210
1.300
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair. HSG B
78 Wetland
66 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (fUft) (fUsec) (cfs)
12.2 80 0.0625 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
O~0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 3
3/29/2007
Subcatchment 3S: Existing Area E3
Runoff =
0.73 cfs @ 12.14 hrs, Volume=
0.058 af, Depth> 0.42"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.290
0.210
1.140
1.640
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
67 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
17.6 170 0.1118 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 4
3/29/2007
Subcatchment 45: Existing Area E4
Runoff =
0.48 cfs @ 12.21 hrs, Volume=
0.042 af, Depth> 0.53"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.250
0.400
0.310
0.960
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
70 Weighted Average
Tc Length Slope Velocity Capacity Description
(m;n) (feet) (ftIft) (ftIsec) (cfs)
24.3 215 0.0805 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 5
3/29/2007
Subcatchment 55: Existing Area E5
Runoff =
1.39 cfs @ 12.30 hrs, Volume=
0.166 af, Depth> 0.36"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.670
1.750
3.190
5.610
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
65 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
28.0 300 0.1100 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
0.8 125 0.2536 2.5 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
28.8 425 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 2 yr Rainfal/=2.80"
Page 6
3/29/2007
Reach 1 R: Area to West
Inflow Area =
Inflow =
Outflow =
3.560 ae, Inflow Depth> 0.42" for 2 yr event
1.39 efs @ 12.15 hrs, Volume= 0.123 af
1.39 efs @ 12.15 hrs, Volume= 0.123 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCA()@ 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 2 yr Rainfall=2.80"
Page 7
3/29/2007
Pond 2W: Area E2 Wetland
1.300 ac, Inflow Depth> 0.39"
0.65 cfs @ 12.07 hrs, Volume=
0.49 cfs @ 12.15 hrs, Volume=
0.49 cfs @ 12.15 hrs, Volume=
Inflow Area =
Inflow =
Outflow =
Primary =
for 2 yr event
0.042 af
0.042 af, Atten= 25%, Lag= 5.1 min
0.042 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 949.40' @ 12.15 hrs Surf.Area= 2,457 sf Storage= 197 cf
Plug-Flow detention time= 9.4 min calculated for 0.042 af (99% of inflow)
Center-of-Mass del. time= 6.4 min ( 850.2 - 843.8 )
Volume
#1
Invert
949.24'
Avail.Storage Storage Description
35,955 ef Custom Stage Data (Prismatic) Listed below (Reeale)
Surf.Area
(sq-ft)
o
11 ,645
19,885
Elevation
(feet)
949.24
950.00
952.00
Inc.Store
(cubic-feet)
o
4,425
31,530
Cum.Store
(cubic-feet)
o
4,425
35,955
Device Routing
#1 Primary
Invert Outlet Devices
949.24' 174.0 deg Sharp-Crested VeefTrap Weir C= 2.46 2.76' Rise
Primary OutFlow Max=0.48 cfs @ 12.15 hrs HW=949.40' (Free Discharge)
"L.1=Sharp-Crested VeefTrap Weir (Weir Controls 0.48 cfs @ 1.0 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 8
3/29/2007
Subcatchment 1S: Existing Area E1
0.66 cfs @ 12.24 hrs, Volume=
0.058 af, Depth> 1.13"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.130
0.050
0.440
0.620
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
68 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (fUft) (fUsee) (cfs)
28.1 230 0.0639 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type /I 24-hr 10 yr Rainfall=4.10"
Page 9
3/29/2007
Subcatchment 25: Existing Area E2
1.99 cfs @ 12.05 hrs, Volume=
0.111 af, Depth> 1.02"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type" 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.100
0.030
0.960
0.210
1.300
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
78 Wetland
66 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
12.2 80 0.0625 0.1 Sheet Flow,
Woods: Light underbrush n= 00400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 1 0
3/29/2007
Subcatchment 3S: Existing Area E3
2.20 cfs @ 12.12 hrs, Volume=
0.147 af, Depth> 1.08"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.290
0.210
1.140
1.640
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
67 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftlsec) (cfs)
17.6 170 0.1118 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type 1/24-hr 10 yr Rainfal/=4.10"
Page 11
3/29/2007
Subcatchment 4S: Existing Area E4
1.26 cfs @ 12.19 hrs, Volume=
0.100 af, Depth> 1.25"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.250
0.400
0.310
0.960
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
70 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftlsec) (cfs)
24.3 215 0.0805 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 10 yr Rainfal/=4.10"
Page 12
3/29/2007
Subcatchment 5S: Existing Area E5
Runoff =
4.78 cfs @ 12.26 hrs, Volume=
0.449 af, Depth> 0.96"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.670
1.750
3.190
5.610
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
65 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) ( ftIft) (ftlsec) (cfs)
28.0 300 0.1100 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
0.8 125 0.2536 2.5 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
28.8 425 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 10 yr Rainfal/=4.10"
Page 13
3/29/2007
Reach 1 R: Area to West
Inflow Area =
Inflow =
Outflow =
3.560 ac, Inflow Depth> 1.06" tor 10 yr event
4.39 cts @ 12.12 hrs, Volume= 0.316 af
4.39 cfs @ 12.12 hrs, Volume= 0.316 at, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 14
3/29/2007
Pond 2W: Area E2 Wetland
I nflow Area =
Inflow =
Outflow =
Primary =
1.300 ac, Inflow Depth> 1.02"
1.99 cfs @ 12.05 hrs, Volume=
1.68 cfs @ 12.12 hrs, Volume=
1.68 cfs @ 12.12 hrs, Volume=
for 10 yr event
0.111 af
0.110 af, Atten= 16%, Lag= 3.7 min
0.110 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 949.50' @ 12.12 hrs Surf.Area= 4,032 sf Storage= 531 ef
Plug-Flow detention time= 7.6 min calculated for 0.110 af (99% of inflow)
Center-of-Mass del. time= 5.4 min ( 825.0 - 819.6 )
Volume
#1
Invert
949.24'
Avail.Storage Storage Description
35,955 ef Custom Stage Data (Prismatic) Listed below (Recale)
Elevation
(feet)
949.24
950.00
952.00
Surf.Area
(sq-ft)
o
11,645
19,885
Inc.Store
(cubic-feet)
o
4,425
31,530
Cum.Store
(cubic-feet)
o
4,425
35,955
Device Routing
#1 Primary
Invert Outlet Devices
949.24' 174.0 deg Sharp-Crested VeefTrap Weir C= 2.46 2.76' Rise
Primary OutFlow Max=1.64 efs @ 12.12 hrs HW=949.50' (Free Discharge)
"t..-1=Sharp-Crested VeefTrap Weir (Weir Controls 1.64 cfs @ 1.3 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 15
3/29/2007
Subcatchment 1S: Existing Area E1
Runoff =
1.44 cfs @ 12.23 hrs, Volume=
0.123 af, Depth> 2.38"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.130
0.050
0.440
0.620
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
68 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
28.1 230 0.0639 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO7.10 sIn 003215 @2005HydroCADSoftwareSolutionsLLC
Type II 24-hr 100 yr Rainfal/=6.00"
Page 16
3/29/2007
Runoff =
Subcatchment 2S: Existing Area E2
4.44 cfs @ 12.05 hrs, Volume=
0.240 af, Depth> 2.22"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.100
0.030
0.960
0.210
1.300
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
78 Wetland
66 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
12.2 80 0.0625 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type /I 24-hr 100 yr Rainfal/=6.00"
Page 17
3/29/2007
Subcatchment 3S: Existing Area E3
4.87 cfs @ 12.11 hrs, Volume=
0.314 af, Depth> 2.30"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type" 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.290
0.210
1.140
1.640
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
67 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
17.6 170 0.1118 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I"
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 18
3/29/2007
Subcatchment 4S: Existing Area E4
2.64 cfs @ 12.18 hrs, Volume=
0.205 af, Depth> 2.56"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.250
0.400
0.310
0.960
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
70 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (fUft) (fUsee) (cfs)
24.3 215 0.0805 0.1 Sheet Flow,
Woods: Light underbrush n= 00400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 19
3/29/2007
Subcatchment 55: Existing Area E5
11.33 cfs @ 12.24 hrs, Volume=
0.991 af, Depth> 2.12"
Runoff =
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.670
1.750
3.190
5.610
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
65 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) ( ftIft) (fUsec) (cfs)
28.0 300 0.1100 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
0.8 125 0.2536 2.5 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
28.8 425 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 20
3/29/2007
Reach 1 R: Area to West
I nflow Area =
Inflow =
Outflow =
3.560 ac, Inflow Depth> 2.28" for 100 yr event
9.94 cfs @ 12.11 hrs, Volume= 0.677 af
9.94 cfs @ 12.11 hrs, Volume= 0.677 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+ Trans method. Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 EXISTING
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 21
3/29/2007
Pond 2W: Area E2 Wetland
Inflow Area =
Inflow =
Outflow =
Primary =
1.300 ac, Inflow Depth> 2.22"
4.44 cfs @ 12.05 hrs, Volume=
3.93 cfs @ 12.10 hrs, Volume=
3.93 cfs @ 12.10 hrs, Volume=
for 100 yr event
0.240 af
0.239 af, Atten= 12%, Lag= 3.2 min
0.239 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 949.61' @ 12.10 hrs Surf.Area= 5,677 sf Storage= 1,052 cf
Plug-Flow detention time= 6.5 min calculated for 0.239 af (99% of inflow)
Center-of-Mass del. time= 4.8 min ( 807.9 - 803.1 )
Volume
#1
Avail.Storage Storage Description
35,955 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Invert
949.24'
Elevation
(feet)
949.24
950.00
952.00
Surf.Area
(sq-ft)
o
11 ,645
19,885
Cum.Store
(cubic-feet)
o
4,425
35,955
Inc.Store
(cubic-feet)
o
4,425
31,530
Device Routing
#1 Primary
Invert Outlet Devices
949.24' 174.0 deg Sharp-Crested VeelTrap Weir C= 2.46 2.76' Rise
Primary OutFlow Max=3.92 cfs @ 12.10 hrs HW=949.61, (Free Discharge)
't..-1=5harp-Crested VeelTrap Weir (Weir Controls 3.92 cfs @ 1.5 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
CD I"-
a.. a..
ro ro
~j~i@0
a. a.
e e
a.. a..
m
~'"
"",;;:':"~(J)'7"'.',',:.,..
':,T-:'
,_,._'...:.::.....,:,',..4..
~
a..
ro
~
<(
'0
a>
en
o
a.
e
a..
~
T
"C
c:
ro
:;::l
a>
~
C\I
W
ro
a>
L..
<(
M...~.....i......
~
T
C\I
a..
ro
a>
L..
<(
"C
a>
en
o
a.
e
a..
L..
a>
3:
a>
~~
~ T
i.
a.
e
a..
"C
c:
o
a..
LO
a..
ro
a>
L..
<(
co
a..
ro
a>
L..
<(
"C
a>
en
o
a.
e
a..
v
a..
ro
a>
L..
<(
"C
a>
en
o
a.
e
a..
LO
a..
ro
a>
L..
<(
"C
a>
en
o
a.
e
a..
()
.....J
.....J
l/)
c:
o
I"-:g
000
w~(J)
(I)-a>
o~~
a.. C') ~
o 0
0:: C/)
a.. 0
o . <(
en uu
~.se
o ~"O
then>.
02I
ro1O
... .- 0
~ go
!J)N
E en@
~<(1O
en 0.......
co:t::N
.-OM
o >,8
CI)..cc:
en"Cln
CO a>
.5 L.. 0
CO ro ^"":
... a. '"
o ~@
0..0
<(
U
e
"0.
>.
I
rn
/fil...............,..c::...
~
I j I
W':~:'
'. .....0., .
..a,
.c/)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 22
3/29/2007
Subcatchment 1 S: Proposed Area P1
Runoff =
0.39 cfs @ 12.16 hrs, Volume=
0.030 af, Depth> 0.57"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.170
0.260
0.200
0.630
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
71 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
20.2 150 0.0617 0.1 Sheet Flow,
Woods: Light underbrush n= 00400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 2 yr Rainfal/=2.80"
Page 23
3/29/2007
Subcatchment 2S: Proposed Area P2
Runoff =
0.97 cfs @ 12.14 hrs, Volume=
0.074 af, Depth> 0.49"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.320
1.030
0.260
0.180
1.790
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
78 Wetland
69 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
7.9 70 0.0200 0.1 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
10.4 65 0.0615 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
18.3 135 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 24
3/29/2007
Subcatchment 3S: Proposed Area P3
Runoff =
1.72 cfs @ 11.99 hrs, Volume=
0.077 af, Depth> 0.80"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.480
0.680
1.160
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
76 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) ( ftlft) (ftlsee) (efs)
5.3 90 0.0889 0.3 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
1.5 360 0.0389 4.0 Shallow Concentrated Flow,
Paved Kv= 20.3 fps
6.8 450 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 25
3/29/2007
Subcatchment 45: Proposed Area P4
Runoff =
0.46 cfs @ 12.01 hrs, Volume=
0.023 af, Depth> 0.50"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.120
0.430
0.550
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
69 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
7.6 150 0.1000 0.3 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 26
3/29/2007
Subcatchment 55: Proposed Area P5
Runoff =
0.55 cfs @ 11.98 hrs, Volume=
0.025 af, Depth> 0.54"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.140
0.410
0.550
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
70 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
5.7 120 0.1333 0.4 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 2 yr Rainfal/=2.80"
Page 27
3/29/2007
Subcatchment 65: Proposed Area P6
Runoff =
0.61 cfs @ 11.99 hrs, Volume=
0.028 af, Depth> 0.57"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.160
0.430
0.590
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG 8
71 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
6.8 150 0.1333 0.4 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@ 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 2 yr Rainfal/=2.80"
Page 28
3/29/2007
Subcatchment 7S: Proposed Area P7
Runoff =
0.24 cfs @ 12.13 hrs, Volume=
0.018 af, Depth> 0.46"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.090
0.260
0.130
0.480
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
68 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
17.2 125 0.0640 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 29
3/29/2007
Subcatchment 8S: Proposed Area P8
1.43 cfs @ 12.22 hrs, Volume=
0.142 af, Depth> 0.39"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type /I 24-hr 2 yr Rainfall=2.80"
Area (ac)
0.660
1.850
1.870
4.380
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
66 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftlsec) (cfs)
23.4 300 0.1723 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 2 yr Rainfall=2.80"
Page 30
3/29/2007
Reach 1 R: Area to West
Inflow Area =
Inflow =
Outflow =
5.270 ac, Inflow Depth> 0.52" for 2 yr event
1.09 cfs @ 12.19 hrs, Volume= 0.229 at
1.09 cts @ 12.19 hrs, Volume= 0.229 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 31
3/29/2007
Reach 3R: RCP Storm Sewer
Inflow Area =
Inflow =
Outflow =
1.160 ac, Inflow Depth> 0.80" for 2 yr event
1.72 cfs @ 11.99 hrs, Volume= 0.077 af
1.60 cfs @ 12.02 hrs, Volume= 0.077 af, Atten= 7%, Lag= 1.9 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Max. Velocity= 5.0 fps, Min. Travel Time= 1.2 min
Avg. Velocity = 1.9 fps, Avg. Travel Time= 3.1 min
Peak Depth= 0.40' @ 12.00 hrs
Capacity at bank full= 7.72 cfs
Inlet Invert= 935.00', Outlet Invert= 930.00'
15.0" Diameter Pipe, n= 0.013
Length= 350.0' Slope= 0.0143 'f
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@7.10 sIn 003215 @2005HydroCADSoftwareSolutionsLLC
Type 1/24-hr 2 yr Rainfall=2.80"
Page 32
3/29/2007
Pond 2W: Area E2 Wetland
Inflow Area =
Inflow =
Outflow =
Primary =
1.790 ae, Inflow Depth> 0.49"
0.97 cfs @ 12.14 hrs, Volume=
0.22 efs @ 12.68 hrs, Volume=
0.22 efs @ 12.68 hrs, Volume=
for 2 yr event
0.074 af
0.067 af, Atten= 78%, Lag= 32.4 min
0.067 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 949.62' @ 12.68 hrs Surf.Area= 5,759 sf Storage= 1,082 cf
Plug-Flow detention time= 88.2 min calculated for 0.067 af (91 % of inflow)
Center-of-Mass del. time= 58.2 min ( 896.3 - 838.0 )
Volume
#1
Avail.Storage Storage Description
35,955 cf Custom Stage Data (Prismatic) Listed below (Recale)
Invert
949.24'
Elevation
(feet)
949.24
950.00
952.00
Surf.Area
(sq-ft)
o
11,645
19,885
Inc.Store
(cubic-feet)
o
4,425
31,530
Cum.Store
(cubic-feet)
o
4,425
35,955
Device Routing
#1 Primary
Invert Outlet Devices
949.24' 90.0 deg Sharp-Crested VeefTrap Weir C= 2.50 1.00' Rise
Primary OutFlow Max=0.22 cfs @ 12.68 hrs HW=949.62' (Free Discharge)
't.....1=Sharp-Crested VeefTrap Weir (Weir Controls 0.22 cfs @ 1.5 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@ 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type 1/24-hr 2 yr Rainfal/=2.80"
Page 33
3/29/2007
Pond 4P: Catch Basin
Inflow Area =
Inflow =
Outflow =
Primary =
0.550 ac, Inflow Depth> 0.50"
0.46 cfs @ 12.01 hrs, Volume=
0.46 cfs @ 12.01 hrs, Volume=
0.46 cfs @ 12.01 hrs, Volume=
for 2 yr event
0.023 af
0.023 af, Atten= 0%, Lag= 0.1 min
0.023 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 939.09' @ 12.01 hrs Surf.Area= 45 sf Storage= 2 cf
Plug-Flow detention time= 0.0 min calculated for 0.023 af (100% of inflow)
Center-of-Mass del. time= 0.0 min ( 830.4 - 830.4 )
Volume
#1
Invert
939.00'
Avail.Storage Storage Description
1,125 cf Custom Stage Data (Prismatic) Listed below (Recale)
Elevation
(feet)
939.00
940.00
941.00
Surf.Area
(sq-ft)
o
520
1,210
Cum.Store
(cubic-feet)
o
260
1,125
Inc.Store
(cubic-feet)
o
260
865
Device Routing
#1 Primary
Invert Outlet Devices
939.00' 21.0" Horiz. Orifice/Grate Limited to weir flow C= 0.600
Primary OutFlow Max=0.45 cfs @ 12.01 hrs HW=939.09' (Free Discharge)
"t....1=Orifice/Grate (Weir Controls 0.45 cfs @ 1.0 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Inflow Area =
Inflow =
Outflow =
Primary =
Type /I 24-hr 2 yr Rainfal/=2.80"
Page 34
3/29/2007
Pond 5P: Area P5 Pond
2.260 ac, Inflow Depth> 0.66"
2.56 cfs @ 12.01 hrs, Volume=
0.48 cfs @ 12.29 hrs, Volume=
0.48 cfs @ 12.29 hrs, Volume=
tor 2 yr event
0.124 at
0.104 at, Atten= 81%, Lag= 16.7 min
0.104 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 931.97' @ 12.29 hrs Surf.Area= 4,434 sf Storage= 2,010 cf
Plug-Flow detention time= 105.8 min calculated for 0.104 af (84% of inflow)
Center-of-Mass del. time= 56.8 min ( 875.4 - 818.7 )
Volume
#1
Invert
931.50'
Avail.Storage Storage Description
9,778 ef Custom Stage Data (Prismatic) Listed below (Recale)
Elevation Surf.Area
(feet) (sq-ft)
931.50 4,055
932.00 4,455
933.50 5,745
Device Routing Invert
#1 Primary 929.00'
#2 Device 1 931.50'
#3 Device 1 933.10'
Inc.Store
( cubic-feet)
o
2,128
7,650
Cum .Store
( cubic-feet)
o
2,128
9,778
Outlet Devices
15.0" x 66.0'long Culvert RCP, square edge headwall, Ke= 0.500
Outlet Invert= 925.00' S= 0.0606 'f Cc= 0.900 n= 0.013
102.7 deg Sharp-Crested VeefTrap Weir C= 2.49 1.00' Rise
48.0" Horiz. Orifice/Grate Limited to weir flow C= 0.600
Primary OutFlow Max=O.48 efs @ 12.29 hrs HW=931.97' (Free Discharge)
"t-1=Culvert (Passes 0.48 efs of 9.05 cfs potential flow)
~=Sharp-crested VeefTrap Weir (Weir Controls 0.48 cfs @ 1.7 fps)
3=Orifice/Grate (Controls 0.00 cfs)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
'05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 35
3/29/2007
Runoff =
Subcatchment 1 S: Proposed Area P1
0.98 cfs @ 12.14 hrs, Volume=
0.069 af, Depth> 1.32"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.170
0.260
0.200
0.630
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
71 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
20.2 150 0.0617 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 36
3/29/2007
Subcatchment 2S: Proposed Area P2
Runoff =
2.64 cfs @ 12.12 hrs, Volume=
0.178 af, Depth> 1.20"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.320
1.030
0.260
0.180
1.790
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
78 Wetland
69 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
7.9 70 0.0200 0.1 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
10.4 65 0.0615 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
18.3 135 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 37
3/29/2007
Subcatchment 3S: Proposed Area P3
Runoff =
3.59 cfs @ 11.98 hrs, Volume=
0.161 af, Depth> 1.66"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type" 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.480
0.680
1.160
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
76 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) ( ftlft) (ftlsec) (cfs)
5.3 90 0.0889 0.3 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
1.5 360 0.0389 4.0 Shallow Concentrated Flow,
Paved Kv= 20.3 fps
6.8 450 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@ 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type" 24-hr 10 yr Rainfal/=4.10"
Page 38
3/29/2007
Subcatchment 4S: Proposed Area P4
Runoff =
1.20 cfs @ 12.00 hrs, Volume=
0.055 af, Depth> 1.20"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.120
0.430
0.550
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
69 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (Wit) (Wsec) (cfs)
7.6 150 0.1000 0.3 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@ 7.10 sin 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 39
3/29/2007
Subcatchment 55: Proposed Area P5
Runoff =
1.34 cfs @ 11.98 hrs, Volume=
0.058 af, Depth> 1.26"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type" 24-hr 10 yr Rainfall=4.10"
Area (a c)
0.140
0.410
0.550
CN Description
98 Paved parking & roofs
61 >750/~ Grass cover, Good, HSG B
70 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (fUsee) (efs)
5.7 120 0.1333 0.4 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 40
3/29/2007
Subcatchment 65: Proposed Area P6
Runoff =
1.46 cfs @ 11.99 hrs, Volume=
0.065 af, Depth> 1.33"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.160
0.430
0.590
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
71 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsee) (efs)
6.8 150 0.1333 0.4 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Runoff =
. Type /I 24-hr 10 yr Rainfal/=4.10"
Page 41
3/29/2007
Subcatchment 7S: Proposed Area P7
0.69 cfs @ 12.11 hrs, Volume=
0.045 af, Depth> 1.14"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (ac)
0.090
0.260
0.130
0.480
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
68 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
17.2 125 0.0640 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 42
3/29/2007
Runoff =
Subcatchment 85: Proposed Area P8
4.60 cfs @ 12.19 hrs, Volume=
0.371 af, Depth> 1.02"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=4.10"
Area (a c)
0.660
1.850
1.870
4.380
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
66 Weighted Average
Tc Length. Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
23.4 300 0.1723 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 43
3/29/2007
Reach 1 R: Area to West
Inflow Area =
Inflow =
Outflow =
5.270 ac, Inflow Depth> 1.25" tor 10 yr event
4.36 cfs @ 12.11 hrs, Volume= 0.550 at
4.36 cfs @ 12.11 hrs, Volume= 0.550 at, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 10 yr Rainfal/=4.10"
Page 44
3/29/2007
Reach 3R: RCP Storm Sewer
Inflow Area =
Inflow =
Outflow =
1.160 ac, Inflow Depth> 1.66" for 10 yr event
3.59 cfs @ 11.98 hrs, Volume= 0.161 af
3.40 cfs @ 12.01 hrs, Volume= 0.160 af, Atten= 5%, Lag= 1.4 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.2 fps, Min. Travel Time= 0.9 min
Avg. Velocity = 2.2 fps, Avg. Travel Time= 2.7 min
Peak Depth= 0.59' @ 12.00 hrs
Capacity at bank full= 7.72 cfs
Inlet Invert= 935.00', Outlet Invert= 930.00'
15.0" Diameter Pipe, n= 0.013
Length= 350.0' Slope= 0.0143 'f
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @2oo5 HydroCAD Software Solutions LLC
Type 1/24-hr 10 yr Rainfall=4.10"
Page 45
3/29/2007
Pond 2W: Area E2 Wetland
Inflow Area =
Inflow =
Outflow =
Primary =
1.790 ac, Inflow Depth> 1.20"
2.64 cfs @ 12.12 hrs, Volume=
0.72 cfs @ 12.50 hrs, Volume=
0.72 cfs @ 12.50 hrs, Volume=
for 10 yr event
0.178 af
0.167 af, Atten= 73%, Lag= 22.9 min
0.167 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 949.85' @ 12.50 hrs Surf.Area= 9,336 sf Storage= 2,844 cf
Plug-Flow detention time= 74.1 min calculated for 0.167 af (94% of inflow)
Center-of-Mass del. time= 52.1 min (869.8 - 817.7)
Volume
#1
Invert
949.24'
AvaiJ.Storage Storage Description
35,955 ef Custom Stage Data (Prismatic) Listed below (Recale)
Elevation
(feet)
949.24
950.00
952.00
Surf.Area
(sq-ft)
o
11 ,645
19,885
Cum.Store
( cubic-feet)
o
4,425
35,955
Inc.Store
( cubic-feet)
o
4,425
31,530
Device Routing
#1 Primary
Invert Outlet Devices
949.24' 90.0 deg Sharp-Crested VeelTrap Weir C= 2.50 1.00' Rise
Primary OutFlow Max=0.72 cfs @ 12.50 hrs HW=949.85' (Free Discharge)
"t-1=Sharp-Crested VeelTrap Weir (Weir Controls 0.72 cfs @ 2.0 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 46
3/29/2007
Pond 4P: Catch Basin
Inflow Area =
Inflow =
Outflow =
Primary =
0.550 ac, Inflow Depth> 1.20"
1.20 cfs @ 12.00 hrs, Volume=
1.20 cfs @ 12.00 hrs, Volume=
1.20 cfs @ 12.00 hrs, Volume=
for 10 yr event
0.055 af
0.055 af, Atten= 0%, Lag= 0.1 min
0.055 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 939.16' @ 12.00 hrs Surf.Area= 85 sf Storage= 7 cf
Plug-Flow detention time= 0.1 min calculated for 0.055 af (100% of inflow)
Center-of-Mass del. time= 0.1 min ( 809.8 - 809.7)
Volume
#1
Invert
939.00'
Avail.Storage Storage Description
1,125 ef Custom Stage Data (Prismatic) Listed below (Recale)
Surf.Area
( sq-ft)
o
520
1,210
Inc.Store
( cubic-feet)
o
260
865
Cum.Store
(cubic-feet)
o
260
1,125
Elevation
(feet)
939.00
940.00
941.00
Device Routing
#1 Primary
Invert Outlet Devices
939.00' 21.0" Horiz. Orifice/Grate Limited to weir flow C= 0.600
Primary OutFlow Max=1.19 cfs @ 12.00 hrs HW=939.16' (Free Discharge)
~1 =Orifice/Grate (Weir Controls 1.19 cfs @ 1.3 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 10 yr Rainfal/=4.10"
Page 47
3/29/2007
Inflow Area =
Inflow =
Outflow =
Primary =
Pond 5P: Area P5 Pond
2.260 ac, Inflow Depth> 1.45"
5.86 cfs @ 12.00 hrs, Volume=
2.57 cfs @ 12.12 hrs, Volume=
2.57 cfs @ 12.12 hrs, Volume=
for 10 yr event
0.273 af
0.249 af, Atten= 56%, Lag= 7.5 min
0.249 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 932.43' @ 12.12 hrs Surf.Area= 4,822 sf Storage= 4,106 cf
Plug-Flow detention time= 66.1 min calculated for 0.249 af (91% of inflow)
Center-of-Mass del. time= 35.4 min ( 836.9 - 801.5 )
Volume
#1
Invert
931.50'
Avail.Storage Storage Description
9,778 ef Custom Stage Data (Prismatic) Listed below (Recale)
Surf.Area
(sq-ft)
4,055
4,455
5,745
Inc.Store
( cubic-feet)
o
2,128
7,650
Cum.Store
( cubic-feet)
o
2,128
9,778
Elevation
(feet)
931.50
. 932.00
933.50
Device Routing
#1 Primary
#2 Device 1
#3 Device 1
Invert Outlet Devices
929.00' 15.0" x 66.0' long Culvert RCP, square edge headwall, Ke= 0.500
Outlet Invert= 925.00' S= 0.0606 'f Cc= 0.900 n= 0.013
931.50' 102.7 deg Sharp-Crested VeelTrap Weir C= 2.49 1.00' Rise
933.10' 48.0" Horiz. Orifice/Grate Limited to weir flow C= 0.600
Primary OutFlow Max=2.52 cfs @ 12.12 hrs HW=932.42' (Free Discharge)
"t..-1=Culvert (Passes 2.52 cfs of 9.88 cfs potential flow)
~2=Sharp-Crested VeelTrap Weir (Weir Controls 2.52 cfs @ 2.4 fps)
L3=Orifice/Grate (Controls 0.00 cfs)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA()@ 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfall=6.00"
Page 48
3/29/2007
Subcatchment 1S: Proposed Area P1
Runoff =
2.00 cfs @ 12.13 hrs, Volume=
0.139 af, Depth> 2.65"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.170
0.260
0.200
0.630
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
71 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
20.2 150 0.0617 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 49
3/29/2007
Subcatchment 2S: Proposed Area P2
Runoff =
5.61 cfs @ 12.11 hrs, Volume=
0.369 af, Depth> 2.47"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.320
1.030
0.260
0.180
1.790
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
78 Wetland
69 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) ( ftIft) (ftIsec) (cfs)
7.9 70 0.0200 0.1 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
10.4 65 0.0615 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
18.3 135 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hf 100 yr Rainfal/=6.00"
Page 50
3/29/2007
Subcatchment 3S: Proposed Area P3
Runoff =
6.61 cfs @ 11.98 hrs, Volume=
0.302 af, Depth> 3.13"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.480
0.680
1.160
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good. HSG 8
76 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) ( ftlft) (ftlsec) (cfs)
5.3 90 0.0889 0.3 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
1.5 360 0.0389 4.0 Shallow Concentrated Flow,
Paved Kv= 20.3 fps
6.8 450 Total
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA()@ 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 51
3/29/2007
Subcatchment 45: Proposed Area P4
Runoff =
2.48 cfs @ 11.99 hrs, Volume=
0.114 af, Depth> 2.48"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.120
0.430
0.550
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
69 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftlsec) (cfs)
7.6 150 0.1000 0.3 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type II 24-hr 100 yr Rainfal/=6.00"
Page 52
3/29/2007
Subcatchment 55: Proposed Area P5
Runoff =
2.69 cfs @ 11.97 hrs, Volume=
0.118 af, Depth> 2.57"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.140
0.410
0.550
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
70 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
5.7 120 0.1333 0.4 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCA[)@ 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 53
3/29/2007
Subcatchment 65: Proposed Area P6
Runoff =
2.91 cfs @ 11.98 hrs, Volume=
0.131 af, Depth> 2.66"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.160
0.430
0.590
CN Description
98 Paved parking & roofs
61 > 75% Grass cover, Good, HSG B
71 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
6.8 150 0.1333 0.4 Sheet Flow,
Grass: Short n= 0.150 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 100 yr Rainfall=6.00"
Page 54
3/29/2007
Subcatchment 7S: Proposed Area P7
Runoff =
1.50 cfs @ 12.10 hrs, Volume=
0.095 af, Depth> 2.39"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac)
0.090
0.260
0.130
0.480
CN Description
98 Paved parking & roofs
61 >75% Grass cover, Good, HSG B
60 Woods, Fair, HSG B
68 Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftIft) (ftIsec) (cfs)
17.2 125 0.0640 0.1 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 55
3/29/2007
Subcatchment 85: Proposed Area P8
Runoff =
10.56 cfs @ 12.17 hrs, Volume=
0.806 af, Depth> 2.21"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 yr Rainfall=6.00"
Area (ac) CN
0.660~ 98
1.850 61
1.870 60
4.380 66
Description
Paved parking & roofs
>75% Grass cover, Good, HSG B
Woods, Fair, HSG B
Weighted Average
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (ftlsec) (cfs)
23.4 300 0.1723 0.2 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.80"
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 56
3/29/2007
Reach 1 R: Area to West
Inflow Area =
Inflow =
Outflow =
5.270 ae, Inflow Depth> 2.56" for 100 yr event
9.73 efs @ 12.06 hrs, Volume= 1.126 af
9.73 efs @ 12.06 hrs, Volume= 1.126 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 57
3/29/2007
Reach 3R: RCP Storm Sewer
Inflow Area =
Inflow =
Outflow =
1.160 ac, Inflow Depth> 3.13" for 100 yr event
6.61 cfs @ 11.98 hrs, Volume= 0.302 af
6.33 cfs @ 12.00 hrs, Volume= 0.302 af, Atten= 4%, Lag= 1.2 min
Routing by Stor-Ind+ Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.1 fps, Min. Travel Time= 0.8 min
Avg. Velocity = 2.4 fps, Avg. Travel Time= 2.4 min
Peak Depth= 0.88' @ 11.99 hrs
Capacity at bank full= 7.72 cfs
Inlet Invert= 935.00', Outlet Invert= 930.00'
15.0" Diameter Pipe, n= 0.013
Length= 350.0' Slope= 0.0143 'f
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sin 003215 @ 2005 HydroCAD Software Solutions LLC
Type /I 24-hr 100 yr Rainfal/=6.00"
Page 58
3/29/2007
Pond 2W: Area E2 Wetland
I nflow Area =
Inflow =
Outflow =
Primary =
1.790 ac, Inflow Depth> 2.47"
5.61 cfs @ 12.11 hrs, Volume=
1.87 cfs @ 12.41 hrs, Volume=
1.87 cfs @ 12.41 hrs, Volume=
for 100 yr event
0.369 af
0.352 af, Atten= 67%, Lag= 18.0 min
0.352 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 950.13' @ 12.41 hrs Surf.Area= 12,185 sf Storage= 5,986 cf
Plug-Flow detention time= 64.2 min calculated for 0.352 af (95% of inflow)
Center-of-Mass del. time= 47.1 min ( 849.8 - 802.7 )
Volume
#1
Avail.Storage Storage Description
35,955 ef Custom Stage Data (Prismatic) Listed below (Reeale)
Invert
949.24'
Elevation
(feet)
949.24
950.00
952.00
Surf.Area
(sq-ft)
o
11 ,645
19,885
Inc.Store
(cubic-feet)
o
4,425
31,530
Cum.Store
(cubic-feet)
o
4,425
35,955
Device Routing
#1 Primary
Invert Outlet Devices
949.24' 90.0 deg Sharp-Crested VeefTrap Weir C= 2.50 1.00' Rise
Primary OutFlow Max=1.87 cfs @ 12.41 hrs HW=950.13' (Free Discharge)
"t-1=Sharp-Crested VeefTrap Weir (Weir Controls 1.87 cfs @ 2.4 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @ 2005 HydroCAD Software Solutions LLC
Type 1/24-hr 100 yr Rainfal/=6.00"
Page 59
3/29/2007
Pond 4P: Catch Basin
Inflow Area =
Inflow =
Outflow =
Primary =
0.550 ac, Inflow Depth> 2.48"
2.48 cfs @ 11.99 hrs, Volume=
2.48 cfs @ 12.00 hrs, Volume=
2.48 cfs @ 12.00 hrs, Volume=
for 100 yr event
0.114 af
0.114af, Atten= 0%, Lag= 0.2 min
0.114 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 939.27' @ 12.00 hrs Surf.Area= 139 sf Storage= 18 cf
Plug-Flow detention time= 0.1 min calculated for 0.114 af (100% of inflow)
Center-of-Mass del. time= 0.1 min ( 794.5 - 794.5 )
Volume
#1
Invert
939.00'
Avail.Storage Storage Description
1,125 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation
(feet)
939.00
940.00
941.00
Surf.Area
(sq-ft)
o
520
1,210
Cum.Store
( cubic-feet)
o
260
1,125
Inc.Store
(cubic-feet)
o
260
865
Device Routing
#1 Primary
Invert Outlet Devices
939.00' 21.0" Horiz. Orifice/Grate Limited to weir flow C= 0.600
Primary OutFlow Max=2.44 cfs @ 12.00 hrs HW=939.26' (Free Discharge)
't.-1=Orifice/Grate (Weir Controls 2.44 cfs @ 1.7 fps)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
05-0190 PROPOSED
Prepared by Otto Associates, Inc.
HydroCAOO 7.10 sIn 003215 @2005 HydroCAD Software Solutions LLC
Type /I 24-hr 100 yr Rainfal/=6.00"
Page 60
3/29/2007
Pond 5P: Area P5 Pond
Inflow Area =
Inflow =
Outflow =
Primary =
2.260 ac, Inflow Depth> 2.83"
11.38 cfs @ 11.99 hrs, Volume=
5.49 cfs @ 12.11 hrs, Volume=
5.49 cfs @ 12.11 hrs, Volume=
for 100 yr event
0.534 af
0.504 af, Atten= 52%, Lag= 6.9 min
0.504 af
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05.hrs
Peak Elev= 933.07' @ 12.11 hrs Surf.Area= 5,372 sf Storage= 7,367 cf
Plug-Flow detention time= 47.7 min calculated for 0.504 af (94% of inflow)
Center-of-Mass del. time= 27.2 min ( 814.6 - 787.4 )
Volume
#1
Invert
931.50'
Avail.Storage Storage Description
9,778 ef Custom Stage Data (Prismatic) Listed below (Reeale)
Elevation
(feet)
931.50
932.00
933.50
Surf.Area
(sq-ft)
4,055
4,455
5,745
Cum.Store
( cubic-feet)
o
2,128
9,778
Inc.Store
( cubic-feet)
o
2,128
7,650
Device Routing
#1 Primary
Invert Outlet Devices
929.00' 15.0" x 66.0' long Culvert RCP, square edge headwall, Ke= 0.500
Outlet Invert= 925.00' S= 0.0606 'f Cc= 0.900 n= 0.013
931.50' 102.7 deg Sharp-Crested VeeITrap Weir C= 2.49 1.00' Rise
933.10' 48.0" Horiz. Orifice/Grate Limited to weir flow C= 0.600
#2 Device 1
#3 Device 1
Primary OutFlow Max=5.47 cfs @ 12.11 hrs HW=933.06' (Free Discharge)
"t-1=Culvert (Passes 5.47 cfs of 10.95 cfs potential flow)
t2=Sharp-crested VeeITrap Weir (Orifice Controls 5.47 cfs@4.4fps)
3=Orifice/Grate (Controls 0.00 cfs)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
STORMWATER MANAGEMENT CALCULATIONS
LOTUS WOODS
Ron Karon
Otto Project No. 2-05-0190
March 14, 2007
Last Revised March 28, 2007
Subcatchment P5 Pond
Water quality volume = 0.74 ac X 0.5 inches = 1,343 cf
Water elevation at water quality volume = 931.82 ft
Allowable water quality discharge = 4,055 sf X 5.66 cfslac = 0.53 cfs
Proposed discharge at water elevation = 0.18 cfs
Permanent pool volume required = 2.26 ac X 1800 cf/ac = 4,068 cf
Permanent pool volume provided = 6,207 cf
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
l~~12G'~
~v ~~-rA;-{~
2..,. oC=; -0\'10
~?S 'Po NO
'\ 1\
\
, \.
\.
1\
'\.
\ \
~
3/t~{Dl
r\ I' II 5
0 d
r-i 0
eO 7- ~
\I' U
. -< E
()
~
'" I 1'- I 1\.1 \.
'" f'\ ~
'" " t\.
"- I'\. ,
~ I\. 1\
\. "- I"
" \.
"' ~
\.
"
,
"\
1\
,
1\
f\
0.'
;&
,
,
1\
\.
I'
"
,
"'
"
"-. .1"
I' "'
, I'
\. 1'\
, 1'\
1'\ \.
" 1'\ ,
~. '\. ~
, 1\ "
" \. '\.
I"l I\. 0.0'
1'\ I'\. ~c9"
"-
1'\ '\.O6'~
'- . ~'J '\.
:\.. I "
00/'-' '\.
f-~" ,
v~'\. I\.
~~, \.
~v 1'\ ~
f:)-t' '\.
v"... I\.
V\. "
" ~
, "
\. ,
1\ '\.
, ~,
1\ ;6
0.
, ~,
J\. ~\.
<?9.
~
~
'$ 1'.
<' '. I'
1'\
'"
I'
en
,
\. '"
1\
\
1\ co
"
J\
,
"
,
"
"
,
"
~
J\.
,
I'
\.
"
"
J\.
\.
"
"
I";
\.
,
1\
I";
\.
l'\
"
~
1'\
"
~
"
\.
I'\.
, ~ l1
I\. . .c
, "- \ \ u
c
I\. -
1\ \. \. 1\ ..
" \ -
" , , 11 \D 0-
\ -
, -
;, -
1"\ " 1\ 1\ .:!
\. "- U') C
-
II:S
, ex:
1'\ , , \. \
, 1"\ "\ 1\ \1
'\. "- , ~
\ 1\ 1\
1\1\
,
'\.
f'
1\
1\
- I-
'. I-
F~
1--
~~
I-~
~
f-
,
"\
...
~~
e;=
~~
\P .
\P(I)
.l:C\f
"0
~ .
;= .
C-
Oll)
~fJ
(:0
::Jll)
O~
1'\
1'\
"
1'\
I'
\.
1\
" ,
"
,
M
\
\
, ('I)'
, 'Uti.
".~
~
PI\ ,,,.
, .;, \ll
,U. N
I' ~
" 'fUll
1\
I-
m: (I)
.~
00
. +
n.a.
.
o
f'
"
1\
"
, \.'
, \.
'" "\ "
~ " ~
'\.
~
I-
1-1-
f--
f-
-
f--
l-
I-
~
1-'-
~~ I I I I I I
I I I I I I
I I " "
co
....
\D
lO
q
M
N
sa43UJ '(b) ))ounJ 13aJJO
Figure 7.1-3: Solution of the runoff equation.
N
..-f
..-f
..-f
o
..-f
~
~
.' -
~~
'0
'g ii'
cte
~ ~
-<(
o
cf
t L
.~
J
i
o
:i~:
r--Jr-&
u.
~
r-
r^ ~D () 0
.n ~* ~ c--l
cr- on a- ll) -
N ~
---
~&
o r
1'-
Vll0l1\
,J) r- r:f:j
~~
lJ) /.!)
!) 0 ~ ~
rn 00 tI) ('I
crcr-(J~<r
,I
\l
r
~
~ ~
~
.tIJ riJ
lr>
. V'
c
~ \
..q
\.0 jl
r()
c:r
-........J
i:?
rJ
6
.
-
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
NOTES:
1. Grates to be mode in (2) PIECES
2. All metal sholl be hat-dipped-galvonized
'5 SMOOTH B
o 4- a.c. EAC
1/4- STEEL PLATE
DETAIL A-A
928.50
66 IF' 15- RCP
o 6.06" TO MH1
INV = 925.00
..;.
".
;-
CONC.
WEIR
(SEE
DETAil)
" '
.,'. ~
f ..,.
,
"",
NOTES: 48- I
1. Standard pipe bedding required on both inlet & outlet pipes.
CITY OF
CIAIBASSII
REVISED: 1-00
F'ILE NAME: 393_3109
DATE:
2-97
S DtiJA A
[ ee e 01 -
r 57-' 0.0.
1/4-X1- FLAT
~
\\
" \\
PII
"
"
\.\.
AR
H WAY -
4 1 -1
STL.
() /2 . 3 UNC
Hex Head Stainless
Steel Bolts With
Nuts and Woshers
1--2.5~
48-
CONCRETE WEIR
DEl All
28 IF' 15- PVC
INLET
PIPE
Monolithicolly
Poured Concrete
POND OUTLET
CONTROL
STRUCTURE
3109
PLATE NO.: