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HydroCAD Report 3S Existing 4S Proposed 1P Existing Pond 2P Proposed Pond Drainage Diagram for Minnetonka Middle School SW Pond Prepared by SEH, Inc., Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Subcat Reach Pond Link Minnetonka Middle School SW Pond Type II 24-hr 2-yr, 24-hr Rainfall=2.80" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 3S: Existing Runoff = 7.09 cfs @12.12 hrs, Volume= 0.528 af, Depth= 1.16" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 2-yr, 24-hr Rainfall=2.80" Area (sf) CN Description 126,860 98 Paved parking, HSG B 110,672 61 >75% Grass cover, Good, HSG B 237,532 81 Weighted Average 110,672 46.59% Pervious Area 126,860 53.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.3 220 0.0320 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 2.5 300 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.3 260 0.0400 14.31 1,502.24 Channel Flow, Area= 105.0 sf Perim= 60.5' r= 1.74' n= 0.030 Short grass 19.1 780 Total Summary for Subcatchment 4S: Proposed Runoff = 6.95 cfs @12.12 hrs, Volume= 0.521 af, Depth= 1.10" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 2-yr, 24-hr Rainfall=2.80" Area (sf) CN Description 126,860 98 Paved parking, HSG B 120,197 61 >75% Grass cover, Good, HSG B 247,057 80 Weighted Average 120,197 48.65% Pervious Area 126,860 51.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.3 220 0.0320 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 2.5 300 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.3 260 0.0400 14.31 1,502.24 Channel Flow, Area= 105.0 sf Perim= 60.5' r= 1.74' n= 0.030 Short grass 19.1 780 Total Minnetonka Middle School SW Pond Type II 24-hr 2-yr, 24-hr Rainfall=2.80" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 3 Summary for Pond 1P: Existing Pond Inflow Area = 5.453 ac, 53.41% Impervious, Inflow Depth = 1.16" for 2-yr, 24-hr event Inflow = 7.09 cfs @12.12 hrs, Volume= 0.528 af Outflow = 6.25 cfs @12.19 hrs, Volume= 0.497 af, Atten= 12%, Lag= 4.2 min Primary = 6.25 cfs @12.19 hrs, Volume= 0.497 af Secondary = 0.00 cfs @0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 1,035.33' @12.19 hrs Surf.Area= 3,570 sf Storage= 2,651 cf Plug-Flow detention time= 47.7 min calculated for 0.497 af (94% of inflow) Center-of-Mass det. time= 15.8 min ( 871.0 -855.3 ) Volume Invert Avail.Storage Storage Description #1 1,034.45' 24,446 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 1,034.45 2,396 0 0 1,035.00 3,180 1,533 1,533 1,036.00 4,356 3,768 5,301 1,037.00 5,663 5,010 10,311 1,038.00 7,013 6,338 16,649 1,039.00 8,581 7,797 24,446 Device Routing Invert Outlet Devices #1 Primary 1,032.10' 12.0" Round Culvert L= 84.0' CPP, square edge headwall, Ke= 0.500 Inlet /Outlet Invert= 1,032.10' /1,026.90' S= 0.0619 '/' Cc= 0.900 n= 0.010 PVC, smooth interior #2 Device 1 1,034.94' 24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Secondary 1,038.60' 15.0' long x 8.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.43 2.54 2.70 2.69 2.68 2.68 2.66 2.64 2.64 2.64 2.65 2.65 2.66 2.66 2.68 2.70 2.74 Primary OutFlow Max=6.25 cfs @12.19 hrs HW=1,035.33' (Free Discharge) 1=Culvert (Inlet Controls 6.25 cfs @7.95 fps) 2=Orifice/Grate (Passes 6.25 cfs of 7.92 cfs potential flow) Secondary OutFlow Max=0.00 cfs @0.00 hrs HW=1,034.45' (Free Discharge) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Minnetonka Middle School SW Pond Type II 24-hr 2-yr, 24-hr Rainfall=2.80" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 4 Summary for Pond 2P: Proposed Pond Inflow Area = 5.672 ac, 51.35% Impervious, Inflow Depth = 1.10" for 2-yr, 24-hr event Inflow = 6.95 cfs @12.12 hrs, Volume= 0.521 af Outflow = 4.34 cfs @12.29 hrs, Volume= 0.521 af, Atten= 38%, Lag= 10.0 min Discarded = 0.07 cfs @12.29 hrs, Volume= 0.053 af Primary = 4.27 cfs @12.29 hrs, Volume= 0.467 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 1,035.66' @12.29 hrs Surf.Area= 3,916 sf Storage= 4,388 cf Plug-Flow detention time= 23.3 min calculated for 0.520 af (100% of inflow) Center-of-Mass det. time= 23.5 min ( 882.2 -858.7 ) Volume Invert Avail.Storage Storage Description #1 1,032.00' 24,767 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 1,032.00 1,824 0.0 0 0 1,034.50 2,578 30.0 1,651 1,651 1,035.00 3,111 30.0 427 2,077 1,036.00 4,336 100.0 3,724 5,801 1,037.00 5,656 100.0 4,996 10,797 1,038.00 6,914 100.0 6,285 17,082 1,039.00 8,456 100.0 7,685 24,767 Device Routing Invert Outlet Devices #1 Discarded 1,032.00' 0.800 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' #2 Device 3 1,035.50' 27.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 1,032.25' 12.0" Round Culvert L= 98.0' CPP, square edge headwall, Ke= 0.500 Inlet /Outlet Invert= 1,032.25' /1,026.90' S= 0.0546 '/' Cc= 0.900 n= 0.010 PVC, smooth interior #4 Device 3 1,032.50' 8.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.07 cfs @12.29 hrs HW=1,035.65' (Free Discharge) 1=Exfiltration ( Controls 0.07 cfs) Primary OutFlow Max=4.23 cfs @12.29 hrs HW=1,035.65' (Free Discharge) 3=Culvert (Passes 4.23 cfs of 6.45 cfs potential flow) 2=Orifice/Grate (Weir Controls 1.41 cfs @1.29 fps) 4=Orifice/Grate (Orifice Controls 2.82 cfs @8.09 fps )Minnetonka Middle School SW Pond Type II 24-hr 10-yr, 24-hr Rainfall=4.20" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment 3S: Existing Runoff = 14.19 cfs @12.12 hrs, Volume= 1.041 af, Depth= 2.29" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr, 24-hr Rainfall=4.20" Area (sf) CN Description 126,860 98 Paved parking, HSG B 110,672 61 >75% Grass cover, Good, HSG B 237,532 81 Weighted Average 110,672 46.59% Pervious Area 126,860 53.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.3 220 0.0320 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 2.5 300 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.3 260 0.0400 14.31 1,502.24 Channel Flow, Area= 105.0 sf Perim= 60.5' r= 1.74' n= 0.030 Short grass 19.1 780 Total Summary for Subcatchment 4S: Proposed Runoff = 14.22 cfs @12.12 hrs, Volume= 1.044 af, Depth= 2.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr, 24-hr Rainfall=4.20" Area (sf) CN Description 126,860 98 Paved parking, HSG B 120,197 61 >75% Grass cover, Good, HSG B 247,057 80 Weighted Average 120,197 48.65% Pervious Area 126,860 51.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.3 220 0.0320 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 2.5 300 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.3 260 0.0400 14.31 1,502.24 Channel Flow, Area= 105.0 sf Perim= 60.5' r= 1.74' n= 0.030 Short grass 19.1 780 Total Minnetonka Middle School SW Pond Type II 24-hr 10-yr, 24-hr Rainfall=4.20" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 6 Summary for Pond 1P: Existing Pond Inflow Area = 5.453 ac, 53.41% Impervious, Inflow Depth = 2.29" for 10-yr, 24-hr event Inflow = 14.19 cfs @12.12 hrs, Volume= 1.041 af Outflow = 7.55 cfs @12.31 hrs, Volume= 1.010 af, Atten= 47%, Lag= 11.6 min Primary = 7.55 cfs @12.31 hrs, Volume= 1.010 af Secondary = 0.00 cfs @0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 1,036.59' @12.31 hrs Surf.Area= 5,121 sf Storage= 8,076 cf Plug-Flow detention time= 33.0 min calculated for 1.010 af (97% of inflow) Center-of-Mass det. time= 14.9 min ( 850.6 -835.7 ) Volume Invert Avail.Storage Storage Description #1 1,034.45' 24,446 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 1,034.45 2,396 0 0 1,035.00 3,180 1,533 1,533 1,036.00 4,356 3,768 5,301 1,037.00 5,663 5,010 10,311 1,038.00 7,013 6,338 16,649 1,039.00 8,581 7,797 24,446 Device Routing Invert Outlet Devices #1 Primary 1,032.10' 12.0" Round Culvert L= 84.0' CPP, square edge headwall, Ke= 0.500 Inlet /Outlet Invert= 1,032.10' /1,026.90' S= 0.0619 '/' Cc= 0.900 n= 0.010 PVC, smooth interior #2 Device 1 1,034.94' 24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Secondary 1,038.60' 15.0' long x 8.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.43 2.54 2.70 2.69 2.68 2.68 2.66 2.64 2.64 2.64 2.65 2.65 2.66 2.66 2.68 2.70 2.74 Primary OutFlow Max=7.54 cfs @12.31 hrs HW=1,036.58' (Free Discharge) 1=Culvert (Inlet Controls 7.54 cfs @9.61 fps) 2=Orifice/Grate (Passes 7.54 cfs of 37.00 cfs potential flow) Secondary OutFlow Max=0.00 cfs @0.00 hrs HW=1,034.45' (Free Discharge) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Minnetonka Middle School SW Pond Type II 24-hr 10-yr, 24-hr Rainfall=4.20" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 7 Summary for Pond 2P: Proposed Pond Inflow Area = 5.672 ac, 51.35% Impervious, Inflow Depth = 2.21" for 10-yr, 24-hr event Inflow = 14.22 cfs @12.12 hrs, Volume= 1.044 af Outflow = 7.60 cfs @12.31 hrs, Volume= 1.044 af, Atten= 47%, Lag= 11.6 min Discarded = 0.10 cfs @12.31 hrs, Volume= 0.062 af Primary = 7.51 cfs @12.31 hrs, Volume= 0.981 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 1,036.69' @12.31 hrs Surf.Area= 5,247 sf Storage= 9,107 cf Plug-Flow detention time= 18.6 min calculated for 1.043 af (100% of inflow) Center-of-Mass det. time= 18.8 min ( 857.4 -838.6 ) Volume Invert Avail.Storage Storage Description #1 1,032.00' 24,767 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 1,032.00 1,824 0.0 0 0 1,034.50 2,578 30.0 1,651 1,651 1,035.00 3,111 30.0 427 2,077 1,036.00 4,336 100.0 3,724 5,801 1,037.00 5,656 100.0 4,996 10,797 1,038.00 6,914 100.0 6,285 17,082 1,039.00 8,456 100.0 7,685 24,767 Device Routing Invert Outlet Devices #1 Discarded 1,032.00' 0.800 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' #2 Device 3 1,035.50' 27.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 1,032.25' 12.0" Round Culvert L= 98.0' CPP, square edge headwall, Ke= 0.500 Inlet /Outlet Invert= 1,032.25' /1,026.90' S= 0.0546 '/' Cc= 0.900 n= 0.010 PVC, smooth interior #4 Device 3 1,032.50' 8.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.10 cfs @12.31 hrs HW=1,036.68' (Free Discharge) 1=Exfiltration ( Controls 0.10 cfs) Primary OutFlow Max=7.50 cfs @12.31 hrs HW=1,036.68' (Free Discharge) 3=Culvert (Inlet Controls 7.50 cfs @9.55 fps) 2=Orifice/Grate (Passes < 20.84 cfs potential flow) 4=Orifice/Grate (Passes < 3.30 cfs potential flow) Minnetonka Middle School SW Pond Type II 24-hr 100-yr, 24-hr Rainfall=6.00" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 3S: Existing Runoff = 23.93 cfs @12.11 hrs, Volume= 1.765 af, Depth= 3.88" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr, 24-hr Rainfall=6.00" Area (sf) CN Description 126,860 98 Paved parking, HSG B 110,672 61 >75% Grass cover, Good, HSG B 237,532 81 Weighted Average 110,672 46.59% Pervious Area 126,860 53.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.3 220 0.0320 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 2.5 300 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.3 260 0.0400 14.31 1,502.24 Channel Flow, Area= 105.0 sf Perim= 60.5' r= 1.74' n= 0.030 Short grass 19.1 780 Total Summary for Subcatchment 4S: Proposed Runoff = 24.28 cfs @12.11 hrs, Volume= 1.787 af, Depth= 3.78" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr, 24-hr Rainfall=6.00" Area (sf) CN Description 126,860 98 Paved parking, HSG B 120,197 61 >75% Grass cover, Good, HSG B 247,057 80 Weighted Average 120,197 48.65% Pervious Area 126,860 51.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.3 220 0.0320 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 2.5 300 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.3 260 0.0400 14.31 1,502.24 Channel Flow, Area= 105.0 sf Perim= 60.5' r= 1.74' n= 0.030 Short grass 19.1 780 Total Minnetonka Middle School SW Pond Type II 24-hr 100-yr, 24-hr Rainfall=6.00" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 9 Summary for Pond 1P: Existing Pond Inflow Area = 5.453 ac, 53.41% Impervious, Inflow Depth = 3.88" for 100-yr, 24-hr event Inflow = 23.93 cfs @12.11 hrs, Volume= 1.765 af Outflow = 8.99 cfs @12.38 hrs, Volume= 1.734 af, Atten= 62%, Lag= 16.2 min Primary = 8.99 cfs @12.38 hrs, Volume= 1.734 af Secondary = 0.00 cfs @0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 1,038.26' @12.38 hrs Surf.Area= 7,414 sf Storage= 18,494 cf Plug-Flow detention time= 30.3 min calculated for 1.732 af (98% of inflow) Center-of-Mass det. time= 19.7 min ( 840.3 -820.6 ) Volume Invert Avail.Storage Storage Description #1 1,034.45' 24,446 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 1,034.45 2,396 0 0 1,035.00 3,180 1,533 1,533 1,036.00 4,356 3,768 5,301 1,037.00 5,663 5,010 10,311 1,038.00 7,013 6,338 16,649 1,039.00 8,581 7,797 24,446 Device Routing Invert Outlet Devices #1 Primary 1,032.10' 12.0" Round Culvert L= 84.0' CPP, square edge headwall, Ke= 0.500 Inlet /Outlet Invert= 1,032.10' /1,026.90' S= 0.0619 '/' Cc= 0.900 n= 0.010 PVC, smooth interior #2 Device 1 1,034.94' 24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Secondary 1,038.60' 15.0' long x 8.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.43 2.54 2.70 2.69 2.68 2.68 2.66 2.64 2.64 2.64 2.65 2.65 2.66 2.66 2.68 2.70 2.74 Primary OutFlow Max=8.99 cfs @12.38 hrs HW=1,038.25' (Free Discharge) 1=Culvert (Inlet Controls 8.99 cfs @11.45 fps) 2=Orifice/Grate (Passes 8.99 cfs of 52.57 cfs potential flow) Secondary OutFlow Max=0.00 cfs @0.00 hrs HW=1,034.45' (Free Discharge) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Minnetonka Middle School SW Pond Type II 24-hr 100-yr, 24-hr Rainfall=6.00" Prepared by SEH, Inc. Printed 6/2/2011 HydroCAD® 9.10 s/n 01109 © 2009 HydroCAD Software Solutions LLC Page 10 Summary for Pond 2P: Proposed Pond Inflow Area = 5.672 ac, 51.35% Impervious, Inflow Depth = 3.78" for 100-yr, 24-hr event Inflow = 24.28 cfs @12.11 hrs, Volume= 1.787 af Outflow = 9.12 cfs @12.38 hrs, Volume= 1.787 af, Atten= 62%, Lag= 16.2 min Discarded = 0.14 cfs @12.38 hrs, Volume= 0.075 af Primary = 8.98 cfs @12.38 hrs, Volume= 1.713 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 1,038.39' @12.38 hrs Surf.Area= 7,514 sf Storage= 19,888 cf Plug-Flow detention time= 22.1 min calculated for 1.785 af (100% of inflow) Center-of-Mass det. time= 22.2 min ( 845.4 -823.2 ) Volume Invert Avail.Storage Storage Description #1 1,032.00' 24,767 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 1,032.00 1,824 0.0 0 0 1,034.50 2,578 30.0 1,651 1,651 1,035.00 3,111 30.0 427 2,077 1,036.00 4,336 100.0 3,724 5,801 1,037.00 5,656 100.0 4,996 10,797 1,038.00 6,914 100.0 6,285 17,082 1,039.00 8,456 100.0 7,685 24,767 Device Routing Invert Outlet Devices #1 Discarded 1,032.00' 0.800 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' #2 Device 3 1,035.50' 27.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 1,032.25' 12.0" Round Culvert L= 98.0' CPP, square edge headwall, Ke= 0.500 Inlet /Outlet Invert= 1,032.25' /1,026.90' S= 0.0546 '/' Cc= 0.900 n= 0.010 PVC, smooth interior #4 Device 3 1,032.50' 8.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.14 cfs @12.38 hrs HW=1,038.38' (Free Discharge) 1=Exfiltration ( Controls 0.14 cfs) Primary OutFlow Max=8.98 cfs @12.38 hrs HW=1,038.38' (Free Discharge) 3=Culvert (Inlet Controls 8.98 cfs @11.43 fps) 2=Orifice/Grate (Passes < 32.52 cfs potential flow) 4=Orifice/Grate (Passes < 3.96 cfs potential flow)