Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Arbor Cove Stormwater Management Report
STORMWATER MANAGEMENT FOR ARBOR COVE Chanhassen, Minnesota January 29, 2014 Otto Project No. 13-0545 Prepared for: Dogwood Road, LLC Prepared by: Otto Associates, Engineers & Land Surveyors, Inc. 9 West Division Street, Buffalo, MN 55313 • 763-682-4727 • Fax 763-682-3522 • www.ottoassociates.com SUMMARY Runoff (cfs) 2 Year 10 Year 100 Year Existing Runoff 0.60 3.56 9.66 Proposed Runoff 0.23 2.38 7.72 Im p e r v i o u s A r e a ( S Q F T ) 33 , 8 6 8 To t a l T r e a t m e n t V o l u m e 2, 9 6 3 Vo l u m e t o b e R e t a i n e d 1, 4 1 1 Wa t e r Q u a l i t y V o l u m e 1, 5 5 2 Se l e c t B M P ( D r o p d o w n ) B M P D e t a i l s ( V o l u m e , A r e a ) U n i t s V o l u m e R e d u c t i o n T P T r e a t m e n t T S S T r e a t m e n t Bi o r e t e n t i o n ( C u b i c F e e t ) 2 , 7 6 9 Cu b i c F e e t 1, 1 0 8 2 , 0 7 7 2 , 4 9 2 Up l a n d V e g e t a t i o n 16 , 6 1 5 Sq u a r e F e e t 69 2 0 0 Se l e c t B M P 0 N/ A 0 0 0 Se l e c t B M P 0 N/ A 0 0 0 Se l e c t B M P 0 N/ A 0 0 0 Se l e c t B M P 0 N/ A 0 0 0 Se l e c t B M P 0 N/ A 0 0 0 Se l e c t B M P 0 N/ A 0 0 0 Se l e c t B M P 0 N/ A 0 0 0 Se l e c t B M P 0 N/ A 0 0 0 To t a l Vo l u m e P e r c e n t a g e o f R e q u i r e m e n t M e e t s R e q u i r e m e n t ? Vo l u m e 1, 8 0 0 127.55%YES TP 2, 0 7 7 133.79%YES TS S 2, 4 9 2 160.54%YES 1S E1 Routing Diagram for 13-0545 EXIST Prepared by Otto Associates, Engineers & Land Surveyors, Inc., Printed 1/29/2014 HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Subcat Reach Pond Link Type II 24-hr 2 yr Rainfall=2.80"13-0545 EXIST Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 2HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: E1 Runoff=0.60 cfs @ 12.61 hrs, Volume=0.135 af, Depth>0.19" 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)CNDescription 6.50058Woods/grass comb., Good, HSG B 0.10098Unconnected roofs, HSG B 0.90061>75% Grass cover, Good, HSG B 1.00058Meadow, non-grazed, HSG B 8.50059Weighted Average 8.40098.82% Pervious Area 0.1001.18% Impervious Area 0.100100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 34.53000.06500.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 8.26000.06001.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 42.7900Total Type II 24-hr 10 yr Rainfall=4.20"13-0545 EXIST Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 3HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: E1 Runoff=3.56 cfs @ 12.48 hrs, Volume=0.492 af, Depth>0.69" 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=4.20" Area (ac)CNDescription 6.50058Woods/grass comb., Good, HSG B 0.10098Unconnected roofs, HSG B 0.90061>75% Grass cover, Good, HSG B 1.00058Meadow, non-grazed, HSG B 8.50059Weighted Average 8.40098.82% Pervious Area 0.1001.18% Impervious Area 0.100100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 34.53000.06500.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 8.26000.06001.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 42.7900Total Type II 24-hr 100 yr Rainfall=6.00"13-0545 EXIST Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 4HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: E1 Runoff=9.66 cfs @ 12.44 hrs, Volume=1.151 af, Depth>1.62" 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)CNDescription 6.50058Woods/grass comb., Good, HSG B 0.10098Unconnected roofs, HSG B 0.90061>75% Grass cover, Good, HSG B 1.00058Meadow, non-grazed, HSG B 8.50059Weighted Average 8.40098.82% Pervious Area 0.1001.18% Impervious Area 0.100100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 34.53000.06500.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 8.26000.06001.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 42.7900Total 1S P1 3S P2 4S P3 5S P4 5R Prop offsite 2P Infil. Basin 3P culvert Routing Diagram for 13-0545 PROP Prepared by Otto Associates, Engineers & Land Surveyors, Inc., Printed 1/29/2014 HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Subcat Reach Pond Link Type II 24-hr 2 yr Rainfall=2.80"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 2HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P1 Runoff=0.55 cfs @ 12.71 hrs, Volume=0.151 af, Depth=0.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription 4.05058Woods/grass comb., Good, HSG B 0.40098Unconnected roofs, HSG B 1.40061>75% Grass cover, Good, HSG B 1.00058Meadow, non-grazed, HSG B 6.85061Weighted Average, UI Adjusted CN = 60 6.45094.16% Pervious Area 0.4005.84% Impervious Area 0.400100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 34.53000.06500.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 6.94400.04501.06 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 7.51400.09000.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 48.9880Total Summary for Subcatchment 3S: P2 Runoff=0.23 cfs @ 12.21 hrs, Volume=0.026 af, Depth=0.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription 0.05058Woods/grass comb., Good, HSG B 0.20098Unconnected roofs, HSG B 0.45061>75% Grass cover, Good, HSG B 0.70071Weighted Average, UI Adjusted CN = 66 0.50071.43% Pervious Area 0.20028.57% Impervious Area 0.200100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 8.0400.04500.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 14.72300.04500.26 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 22.7270Total Type II 24-hr 2 yr Rainfall=2.80"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 3HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P3 Runoff=0.15 cfs @ 12.15 hrs, Volume=0.016 af, Depth=0.38" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription 0.10098Unconnected roofs, HSG B 0.30061>75% Grass cover, Good, HSG B 0.10058Woods/grass comb., Good, HSG B 0.50068Weighted Average, UI Adjusted CN = 64 0.40080.00% Pervious Area 0.10020.00% Impervious Area 0.100100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 9.2750.11000.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 9.31500.06000.27 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 18.5225Total Summary for Subcatchment 5S: P4 Runoff=0.85 cfs @ 11.99 hrs, Volume=0.042 af, Depth=0.83" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription 0.22098Unconnected roofs, HSG B 0.38061>75% Grass cover, Good, HSG B 0.60075Weighted Average 0.38063.33% Pervious Area 0.22036.67% Impervious Area 0.220100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0700.04000.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 0.4450.07701.88 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.80" 0.41550.10006.42 Shallow Concentrated Flow, Paved Kv= 20.3 fps 6.8270Total Type II 24-hr 2 yr Rainfall=2.80"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 4HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 5R: Prop offsite Inflow Area =8.650 ac,10.64% Impervious, Inflow Depth = 0.04" for 2 yr event Inflow=0.23 cfs @ 12.21 hrs, Volume=0.026 af Outflow=0.23 cfs @ 12.21 hrs, Volume=0.026 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Summary for Pond 2P: Infil. Basin Inflow Area =7.950 ac,9.06% Impervious, Inflow Depth = 0.31" for 2 yr event Inflow=0.90 cfs @ 12.00 hrs, Volume=0.209 af Outflow=0.60 cfs @ 12.00 hrs, Volume=0.209 af, Atten= 33%, Lag= 0.0 min Discarded=0.60 cfs @ 12.00 hrs, Volume=0.209 af Primary=0.00 cfs @ 2.00 hrs, Volume=0.000 af Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 982.08' @ 12.09 hrs Surf.Area= 1,475 sf Storage= 118 cf Plug-Flow detention time= 0.7 min calculated for 0.209 af (100% of inflow) Center-of-Mass det. time= 0.7 min ( 955.0 - 954.3 ) VolumeInvertAvail.StorageStorage Description #1982.00'6,830 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 982.001,43000 984.002,5403,9703,970 985.003,1802,8606,830 DeviceRouting InvertOutlet Devices #1Primary980.00'15.0" Round Culvert L= 28.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 980.00' / 978.00' S= 0.0714 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2Device 1983.50'27.0" Vert. Orifice/Grate C= 0.600 #3Discarded982.00'0.60 cfs Exfiltration at all elevations Phase-In= 0.01' Discarded OutFlow Max=0.60 cfs @ 12.00 hrs HW=982.04' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.60 cfs) Primary OutFlow Max=0.00 cfs @ 2.00 hrs HW=982.00' TW=0.00' (Dynamic Tailwater) 1=Culvert (Passes 0.00 cfs of 6.93 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) Summary for Pond 3P: culvert Inflow Area =7.450 ac,8.32% Impervious, Inflow Depth = 0.31" for 2 yr event Inflow=0.86 cfs @ 11.99 hrs, Volume=0.193 af Outflow=0.85 cfs @ 12.00 hrs, Volume=0.193 af, Atten= 1%, Lag= 0.5 min Primary=0.85 cfs @ 12.00 hrs, Volume=0.193 af Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Type II 24-hr 2 yr Rainfall=2.80"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 5HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Peak Elev= 983.91' @ 12.00 hrs Surf.Area= 111 sf Storage= 23 cf Plug-Flow detention time= 0.4 min calculated for 0.193 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 956.7 - 956.3 ) VolumeInvertAvail.StorageStorage Description #1983.50'929 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 983.50000 984.001353434 986.00760895929 DeviceRouting InvertOutlet Devices #1Primary983.50'18.0" Round Culvert L= 55.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 983.50' / 982.00' S= 0.0273 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf Primary OutFlow Max=0.85 cfs @ 12.00 hrs HW=983.91' TW=982.04' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.85 cfs @ 2.18 fps) Type II 24-hr 10 yr Rainfall=4.20"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 6HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P1 Runoff=2.86 cfs @ 12.55 hrs, Volume=0.492 af, Depth=0.86" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription 4.05058Woods/grass comb., Good, HSG B 0.40098Unconnected roofs, HSG B 1.40061>75% Grass cover, Good, HSG B 1.00058Meadow, non-grazed, HSG B 6.85061Weighted Average, UI Adjusted CN = 60 6.45094.16% Pervious Area 0.4005.84% Impervious Area 0.400100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 34.53000.06500.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 6.94400.04501.06 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 7.51400.09000.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 48.9880Total Summary for Subcatchment 3S: P2 Runoff=0.80 cfs @ 12.18 hrs, Volume=0.070 af, Depth=1.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription 0.05058Woods/grass comb., Good, HSG B 0.20098Unconnected roofs, HSG B 0.45061>75% Grass cover, Good, HSG B 0.70071Weighted Average, UI Adjusted CN = 66 0.50071.43% Pervious Area 0.20028.57% Impervious Area 0.200100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 8.0400.04500.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 14.72300.04500.26 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 22.7270Total Type II 24-hr 10 yr Rainfall=4.20"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 7HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P3 Runoff=0.57 cfs @ 12.13 hrs, Volume=0.045 af, Depth=1.09" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription 0.10098Unconnected roofs, HSG B 0.30061>75% Grass cover, Good, HSG B 0.10058Woods/grass comb., Good, HSG B 0.50068Weighted Average, UI Adjusted CN = 64 0.40080.00% Pervious Area 0.10020.00% Impervious Area 0.100100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 9.2750.11000.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 9.31500.06000.27 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 18.5225Total Summary for Subcatchment 5S: P4 Runoff=1.90 cfs @ 11.99 hrs, Volume=0.091 af, Depth=1.82" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription 0.22098Unconnected roofs, HSG B 0.38061>75% Grass cover, Good, HSG B 0.60075Weighted Average 0.38063.33% Pervious Area 0.22036.67% Impervious Area 0.220100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0700.04000.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 0.4450.07701.88 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.80" 0.41550.10006.42 Shallow Concentrated Flow, Paved Kv= 20.3 fps 6.8270Total Type II 24-hr 10 yr Rainfall=4.20"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 8HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 5R: Prop offsite Inflow Area =8.650 ac,10.64% Impervious, Inflow Depth = 0.32" for 10 yr event Inflow=2.38 cfs @ 12.74 hrs, Volume=0.233 af Outflow=2.38 cfs @ 12.74 hrs, Volume=0.233 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Summary for Pond 2P: Infil. Basin Inflow Area =7.950 ac,9.06% Impervious, Inflow Depth = 0.95" for 10 yr event Inflow=3.12 cfs @ 12.56 hrs, Volume=0.628 af Outflow=2.80 cfs @ 12.75 hrs, Volume=0.628 af, Atten= 10%, Lag= 11.4 min Discarded=0.60 cfs @ 11.88 hrs, Volume=0.466 af Primary=2.20 cfs @ 12.75 hrs, Volume=0.163 af Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 984.09' @ 12.75 hrs Surf.Area= 2,600 sf Storage= 4,210 cf Plug-Flow detention time= 35.9 min calculated for 0.628 af (100% of inflow) Center-of-Mass det. time= 35.9 min ( 947.9 - 912.0 ) VolumeInvertAvail.StorageStorage Description #1982.00'6,830 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 982.001,43000 984.002,5403,9703,970 985.003,1802,8606,830 DeviceRouting InvertOutlet Devices #1Primary980.00'15.0" Round Culvert L= 28.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 980.00' / 978.00' S= 0.0714 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2Device 1983.50'27.0" Vert. Orifice/Grate C= 0.600 #3Discarded982.00'0.60 cfs Exfiltration at all elevations Phase-In= 0.01' Discarded OutFlow Max=0.60 cfs @ 11.88 hrs HW=982.04' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.60 cfs) Primary OutFlow Max=2.20 cfs @ 12.75 hrs HW=984.09' TW=0.00' (Dynamic Tailwater) 1=Culvert (Passes 2.20 cfs of 11.00 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.20 cfs @ 2.62 fps) Summary for Pond 3P: culvert Inflow Area =7.450 ac,8.32% Impervious, Inflow Depth = 0.94" for 10 yr event Inflow=3.03 cfs @ 12.55 hrs, Volume=0.583 af Outflow=2.98 cfs @ 12.56 hrs, Volume=0.583 af, Atten= 2%, Lag= 0.8 min Primary=2.98 cfs @ 12.56 hrs, Volume=0.583 af Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Type II 24-hr 10 yr Rainfall=4.20"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 9HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Peak Elev= 984.50' @ 12.67 hrs Surf.Area= 290 sf Storage= 139 cf Plug-Flow detention time= 0.6 min calculated for 0.583 af (100% of inflow) Center-of-Mass det. time= 0.6 min ( 914.1 - 913.5 ) VolumeInvertAvail.StorageStorage Description #1983.50'929 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 983.50000 984.001353434 986.00760895929 DeviceRouting InvertOutlet Devices #1Primary983.50'18.0" Round Culvert L= 55.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 983.50' / 982.00' S= 0.0273 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf Primary OutFlow Max=2.98 cfs @ 12.56 hrs HW=984.47' TW=983.98' (Dynamic Tailwater) 1=Culvert (Outlet Controls 2.98 cfs @ 3.51 fps) Type II 24-hr 100 yr Rainfall=6.00"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 10HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P1 Runoff=7.46 cfs @ 12.54 hrs, Volume=1.097 af, Depth=1.92" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=6.00" Area (ac)CNDescription 4.05058Woods/grass comb., Good, HSG B 0.40098Unconnected roofs, HSG B 1.40061>75% Grass cover, Good, HSG B 1.00058Meadow, non-grazed, HSG B 6.85061Weighted Average, UI Adjusted CN = 60 6.45094.16% Pervious Area 0.4005.84% Impervious Area 0.400100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 34.53000.06500.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 6.94400.04501.06 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 7.51400.09000.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 48.9880Total Summary for Subcatchment 3S: P2 Runoff=1.73 cfs @ 12.16 hrs, Volume=0.142 af, Depth=2.44" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=6.00" Area (ac)CNDescription 0.05058Woods/grass comb., Good, HSG B 0.20098Unconnected roofs, HSG B 0.45061>75% Grass cover, Good, HSG B 0.70071Weighted Average, UI Adjusted CN = 66 0.50071.43% Pervious Area 0.20028.57% Impervious Area 0.200100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 8.0400.04500.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 14.72300.04500.26 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 22.7270Total Type II 24-hr 100 yr Rainfall=6.00"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 11HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P3 Runoff=1.28 cfs @ 12.11 hrs, Volume=0.094 af, Depth=2.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=6.00" Area (ac)CNDescription 0.10098Unconnected roofs, HSG B 0.30061>75% Grass cover, Good, HSG B 0.10058Woods/grass comb., Good, HSG B 0.50068Weighted Average, UI Adjusted CN = 64 0.40080.00% Pervious Area 0.10020.00% Impervious Area 0.100100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 9.2750.11000.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 9.31500.06000.27 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 18.5225Total Summary for Subcatchment 5S: P4 Runoff=3.40 cfs @ 11.98 hrs, Volume=0.164 af, Depth=3.28" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=6.00" Area (ac)CNDescription 0.22098Unconnected roofs, HSG B 0.38061>75% Grass cover, Good, HSG B 0.60075Weighted Average 0.38063.33% Pervious Area 0.22036.67% Impervious Area 0.220100.00% Unconnected TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0700.04000.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 0.4450.07701.88 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.80" 0.41550.10006.42 Shallow Concentrated Flow, Paved Kv= 20.3 fps 6.8270Total Type II 24-hr 100 yr Rainfall=6.00"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 12HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 5R: Prop offsite Inflow Area =8.650 ac,10.64% Impervious, Inflow Depth = 1.20" for 100 yr event Inflow=7.72 cfs @ 12.59 hrs, Volume=0.861 af Outflow=7.72 cfs @ 12.59 hrs, Volume=0.861 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Summary for Pond 2P: Infil. Basin Inflow Area =7.950 ac,9.06% Impervious, Inflow Depth = 2.05" for 100 yr event Inflow=7.97 cfs @ 12.55 hrs, Volume=1.355 af Outflow=7.83 cfs @ 12.61 hrs, Volume=1.355 af, Atten= 2%, Lag= 3.7 min Discarded=0.60 cfs @ 11.74 hrs, Volume=0.636 af Primary=7.23 cfs @ 12.61 hrs, Volume=0.719 af Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 984.63' @ 12.61 hrs Surf.Area= 2,943 sf Storage= 5,695 cf Plug-Flow detention time= 32.8 min calculated for 1.355 af (100% of inflow) Center-of-Mass det. time= 32.8 min ( 921.0 - 888.2 ) VolumeInvertAvail.StorageStorage Description #1982.00'6,830 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 982.001,43000 984.002,5403,9703,970 985.003,1802,8606,830 DeviceRouting InvertOutlet Devices #1Primary980.00'15.0" Round Culvert L= 28.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 980.00' / 978.00' S= 0.0714 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2Device 1983.50'27.0" Vert. Orifice/Grate C= 0.600 #3Discarded982.00'0.60 cfs Exfiltration at all elevations Phase-In= 0.01' Discarded OutFlow Max=0.60 cfs @ 11.74 hrs HW=982.04' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.60 cfs) Primary OutFlow Max=7.23 cfs @ 12.61 hrs HW=984.63' TW=0.00' (Dynamic Tailwater) 1=Culvert (Passes 7.23 cfs of 11.82 cfs potential flow) 2=Orifice/Grate (Orifice Controls 7.23 cfs @ 3.62 fps) Summary for Pond 3P: culvert Inflow Area =7.450 ac,8.32% Impervious, Inflow Depth = 2.03" for 100 yr event Inflow=7.76 cfs @ 12.50 hrs, Volume=1.261 af Outflow=7.67 cfs @ 12.56 hrs, Volume=1.261 af, Atten= 1%, Lag= 3.3 min Primary=7.67 cfs @ 12.56 hrs, Volume=1.261 af Routing by Dyn-Stor-Ind method, Time Span= 2.00-100.00 hrs, dt= 0.01 hrs / 3 Type II 24-hr 100 yr Rainfall=6.00"13-0545 PROP Printed 1/29/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 13HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Peak Elev= 985.44' @ 12.57 hrs Surf.Area= 584 sf Storage= 550 cf Plug-Flow detention time= 0.8 min calculated for 1.261 af (100% of inflow) Center-of-Mass det. time= 0.8 min ( 890.3 - 889.5 ) VolumeInvertAvail.StorageStorage Description #1983.50'929 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 983.50000 984.001353434 986.00760895929 DeviceRouting InvertOutlet Devices #1Primary983.50'18.0" Round Culvert L= 55.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 983.50' / 982.00' S= 0.0273 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf Primary OutFlow Max=7.67 cfs @ 12.56 hrs HW=985.44' TW=984.62' (Dynamic Tailwater) 1=Culvert (Inlet Controls 7.67 cfs @ 4.34 fps)