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MMW Hydrocad Exist North Pond 9-8-15A1 East Grass Fields & Tennis Cts A11 Det Pond A2 West Grass & Tennis Courts A3 Main Parking Lot 1CB 1P East Filtration Swale 2P West Filtration Swale 3P Det Pond Routing Diagram for MMW Exist Pond 2003 Design 8-28-15 Prepared by Microsoft, Printed 9/8/2015 HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Subcat Reach Pond Link MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 2HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.540 39 >75% Grass cover, Good, HSG A (A11) 10.050 61 >75% Grass cover, Good, HSG B (A1, A2, A3) 1.963 98 Parking Lot (A3) 1.227 98 Path (A1, A2) 0.254 98 Pond (A11) 14.034 69 TOTAL AREA MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 3HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.540 HSG A A11 10.050 HSG B A1, A2, A3 0.000 HSG C 0.000 HSG D 3.444 Other A1, A11, A2, A3 14.034 TOTAL AREA MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 4HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.540 10.050 0.000 0.000 0.000 10.590 >75% Grass cover, Good A1, A11, A2, A3 0.000 0.000 0.000 0.000 1.963 1.963 Parking Lot A3 0.000 0.000 0.000 0.000 1.227 1.227 Path A1, A2 0.000 0.000 0.000 0.000 0.254 0.254 Pond A11 0.540 10.050 0.000 0.000 3.444 14.034 TOTAL AREA MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 5HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line#Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 1 1,043.50 1,043.67 35.0 -0.0049 0.015 24.0 0.0 0.0 2 1P 1,055.00 1,046.00 140.0 0.0643 0.010 18.0 0.0 0.0 3 2P 1,046.50 1,046.00 30.0 0.0167 0.010 12.0 0.0 0.0 4 3P 1,043.64 1,043.20 50.0 0.0088 0.015 18.0 0.0 0.0 Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 6HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=6.467 ac 10.65% Impervious Runoff Depth=0.23"Subcatchment A1: East Grass Fields & Tennis Flow Length=400' Tc=45.0 min CN=65 Runoff=0.48 cfs 0.122 af Runoff Area=0.794 ac 31.99% Impervious Runoff Depth=0.09"Subcatchment A11: Det Pond Flow Length=100' Tc=6.3 min CN=58 Runoff=0.01 cfs 0.006 af Runoff Area=0.813 ac 66.17% Impervious Runoff Depth=1.02"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=85 Runoff=0.70 cfs 0.069 af Runoff Area=5.960 ac 32.94% Impervious Runoff Depth=0.46"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=3.61 cfs 0.230 af Peak Elev=1,044.62' Inflow=3.61 cfs 0.230 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=3.61 cfs 0.230 af Peak Elev=1,060.12' Storage=0.084 af Inflow=0.48 cfs 0.122 afPond 1P: East Filtration Swale Discarded=0.05 cfs 0.112 af Primary=0.00 cfs 0.000 af Outflow=0.05 cfs 0.112 af Peak Elev=1,050.98' Storage=0.037 af Inflow=0.70 cfs 0.069 afPond 2P: West Filtration Swale Discarded=0.04 cfs 0.061 af Primary=0.04 cfs 0.008 af Outflow=0.07 cfs 0.069 af Peak Elev=1,040.61' Storage=0.237 af Inflow=3.62 cfs 0.244 afPond 3P: Det Pond Discarded=0.01 cfs 0.040 af Primary=0.00 cfs 0.000 af Outflow=0.01 cfs 0.040 af Total Runoff Area = 14.034 ac Runoff Volume = 0.427 af Average Runoff Depth = 0.37" 75.46% Pervious = 10.590 ac 24.54% Impervious = 3.444 ac Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 7HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A1: East Grass Fields & Tennis Cts Runoff =0.48 cfs @ 12.60 hrs, Volume=0.122 af, Depth=0.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 1 year Rainfall=2.30" Area (ac)CN Description 5.778 61 >75% Grass cover, Good, HSG B *0.689 98 Path 6.467 65 Weighted Average 5.778 89.35% Pervious Area 0.689 10.65% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 43.6 300 0.0150 0.11 Sheet Flow, Existing grass play field Grass: Dense n= 0.240 P2= 2.50" 1.4 100 0.0200 1.22 Sheet Flow, Paved Path Smooth surfaces n= 0.011 P2= 2.50" 45.0 400 Total Subcatchment A1: East Grass Fields & Tennis Cts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 1 year Rainfall=2.30" Runoff Area=6.467 ac Runoff Volume=0.122 af Runoff Depth=0.23" Flow Length=400' Tc=45.0 min CN=65 0.48 cfs Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 8HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A11: Det Pond Runoff =0.01 cfs @ 12.37 hrs, Volume=0.006 af, Depth=0.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 1 year Rainfall=2.30" Area (ac)CN Description *0.254 98 Pond 0.540 39 >75% Grass cover, Good, HSG A 0.794 58 Weighted Average 0.540 68.01% Pervious Area 0.254 31.99% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 1.4 50 0.0050 0.61 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 4.9 50 0.1000 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 6.3 100 Total Subcatchment A11: Det Pond Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Type II 24-hr 1 year Rainfall=2.30" Runoff Area=0.794 ac Runoff Volume=0.006 af Runoff Depth=0.09" Flow Length=100' Tc=6.3 min CN=58 0.01 cfs Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 9HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A2: West Grass & Tennis Courts Runoff =0.70 cfs @ 12.27 hrs, Volume=0.069 af, Depth=1.02" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 1 year Rainfall=2.30" Area (ac)CN Description *0.538 98 Path 0.275 61 >75% Grass cover, Good, HSG B 0.813 85 Weighted Average 0.275 33.83% Pervious Area 0.538 66.17% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.7 300 0.0150 1.35 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 26.9 300 0.0500 0.19 Sheet Flow, West Grass Grass: Dense n= 0.240 P2= 2.50" 30.6 600 Total Subcatchment A2: West Grass & Tennis Courts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 1 year Rainfall=2.30" Runoff Area=0.813 ac Runoff Volume=0.069 af Runoff Depth=1.02" Flow Length=600' Tc=30.6 min CN=85 0.70 cfs Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 10HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A3: Main Parking Lot Runoff =3.61 cfs @ 12.04 hrs, Volume=0.230 af, Depth=0.46" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 1 year Rainfall=2.30" Area (ac)CN Description *1.963 98 Parking Lot 3.997 61 >75% Grass cover, Good, HSG B 5.960 73 Weighted Average 3.997 67.06% Pervious Area 1.963 32.94% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 4.4 300 0.0100 1.15 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 6.4 50 0.0200 0.13 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 10.8 350 Total Subcatchment A3: Main Parking Lot Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 1 year Rainfall=2.30" Runoff Area=5.960 ac Runoff Volume=0.230 af Runoff Depth=0.46" Flow Length=350' Tc=10.8 min CN=73 3.61 cfs Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 11HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1: [57] Hint: Peaked at 1,044.62' (Flood elevation advised) Inflow Area =5.960 ac,32.94% Impervious, Inflow Depth = 0.46" for 1 year event Inflow =3.61 cfs @ 12.04 hrs, Volume=0.230 af Outflow =3.61 cfs @ 12.04 hrs, Volume=0.230 af, Atten= 0%, Lag= 0.0 min Primary =3.61 cfs @ 12.04 hrs, Volume=0.230 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,044.62' @ 12.04 hrs Device Routing Invert Outlet Devices #1 Primary 1,043.67'24.0" Round Culvert L= 35.0' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 1,043.50' / 1,043.67' S= -0.0049 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf Primary OutFlow Max=3.61 cfs @ 12.04 hrs HW=1,044.62' TW=1,036.62' (Dynamic Tailwater) 1=Culvert (Barrel Controls 3.61 cfs @ 2.88 fps) Pond 1: Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Inflow Area=5.960 ac Peak Elev=1,044.62' 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' 3.61 cfs 3.61 cfs Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 12HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1P: East Filtration Swale Inflow Area =6.467 ac,10.65% Impervious, Inflow Depth = 0.23" for 1 year event Inflow =0.48 cfs @ 12.60 hrs, Volume=0.122 af Outflow =0.05 cfs @ 24.34 hrs, Volume=0.112 af, Atten= 89%, Lag= 704.0 min Discarded =0.05 cfs @ 24.34 hrs, Volume=0.112 af Primary =0.00 cfs @ 0.00 hrs, Volume=0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,060.12' @ 24.34 hrs Surf.Area= 0.141 ac Storage= 0.084 af Plug-Flow detention time= 1,127.4 min calculated for 0.112 af (92% of inflow) Center-of-Mass det. time= 1,086.9 min ( 2,061.6 - 974.7 ) Volume Invert Avail.Storage Storage Description #1 1,059.00'0.343 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,059.00 0.040 0.000 0.000 1,060.00 0.100 0.070 0.070 1,061.00 0.447 0.273 0.343 Device Routing Invert Outlet Devices #1 Primary 1,055.00'18.0" Round Culvert L= 140.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,055.00' / 1,046.00' S= 0.0643 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 1.77 sf #2 Device 1 1,060.40'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,059.00'0.500 in/hr Exfiltration over Surface area from 1,059.00' - 1,060.50' Excluded Surface area = 0.040 ac Phase-In= 0.01' Discarded OutFlow Max=0.05 cfs @ 24.34 hrs HW=1,060.12' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.05 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,059.00' TW=1,034.00' (Dynamic Tailwater) 1=Culvert (Passes 0.00 cfs of 13.53 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 13HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 1P: East Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=6.467 ac Peak Elev=1,060.12' Storage=0.084 af 0.48 cfs 0.05 cfs 0.05 cfs 0.00 cfs Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 14HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 2P: West Filtration Swale Inflow Area =0.813 ac,66.17% Impervious, Inflow Depth = 1.02" for 1 year event Inflow =0.70 cfs @ 12.27 hrs, Volume=0.069 af Outflow =0.07 cfs @ 13.67 hrs, Volume=0.069 af, Atten= 89%, Lag= 84.3 min Discarded =0.04 cfs @ 13.67 hrs, Volume=0.061 af Primary =0.04 cfs @ 13.67 hrs, Volume=0.008 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,050.98' @ 13.67 hrs Surf.Area= 0.080 ac Storage= 0.037 af Plug-Flow detention time= 493.7 min calculated for 0.069 af (100% of inflow) Center-of-Mass det. time= 493.6 min ( 1,355.0 - 861.4 ) Volume Invert Avail.Storage Storage Description #1 1,050.00'0.038 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,050.00 0.018 0.000 0.000 1,050.50 0.027 0.011 0.011 1,051.00 0.082 0.027 0.038 Device Routing Invert Outlet Devices #1 Primary 1,046.50'12.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,046.50' / 1,046.00' S= 0.0167 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Device 1 1,050.90'24.0" Vert. Orifice/Grate C= 0.600 #3 Discarded 1,050.00'0.500 in/hr Exfiltration over Horizontal area from 1,049.00' - 1,050.90' Conductivity to Groundwater Elevation = 0.00' Excluded Horizontal area = 0.000 ac Phase-In= 0.01' Discarded OutFlow Max=0.04 cfs @ 13.67 hrs HW=1,050.98' (Free Discharge) 3=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.04 cfs @ 13.67 hrs HW=1,050.98' TW=1,039.07' (Dynamic Tailwater) 1=Culvert (Passes 0.04 cfs of 6.66 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.04 cfs @ 0.95 fps) Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 15HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 2P: West Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.813 ac Peak Elev=1,050.98' Storage=0.037 af 0.70 cfs 0.07 cfs 0.04 cfs 0.04 cfs Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 16HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Det Pond Inflow Area =14.034 ac,24.54% Impervious, Inflow Depth = 0.21" for 1 year event Inflow =3.62 cfs @ 12.04 hrs, Volume=0.244 af Outflow =0.01 cfs @ 24.26 hrs, Volume=0.040 af, Atten= 100%, Lag= 733.1 min Discarded =0.01 cfs @ 24.26 hrs, Volume=0.040 af Primary =0.00 cfs @ 0.00 hrs, Volume=0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,040.61' @ 24.26 hrs Surf.Area= 0.086 ac Storage= 0.237 af Plug-Flow detention time= 1,824.5 min calculated for 0.040 af (16% of inflow) Center-of-Mass det. time= 1,648.3 min ( 2,543.8 - 895.4 ) Volume Invert Avail.Storage Storage Description #1 1,034.00'1.327 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,034.00 0.005 0.000 0.000 1,035.00 0.010 0.008 0.008 1,036.00 0.017 0.013 0.021 1,037.00 0.027 0.022 0.043 1,038.00 0.040 0.033 0.077 1,039.00 0.055 0.048 0.124 1,040.00 0.073 0.064 0.188 1,041.00 0.095 0.084 0.272 1,042.00 0.122 0.109 0.381 1,043.00 0.183 0.152 0.533 1,044.00 0.254 0.219 0.752 1,045.00 0.287 0.270 1.022 1,046.00 0.323 0.305 1.327 Device Routing Invert Outlet Devices #1 Primary 1,043.64'18.0" Round Surface Outlet L= 50.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.64' / 1,043.20' S= 0.0088 '/' Cc= 0.900 n= 0.015 Concrete, trowel finish, Flow Area= 1.77 sf #2 Device 1 1,045.44'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,034.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Phase-In= 0.01' Discarded OutFlow Max=0.01 cfs @ 24.26 hrs HW=1,040.61' (Free Discharge) 3=Exfiltration ( Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,034.00' (Free Discharge) 1=Surface Outlet ( Controls 0.00 cfs) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr 1 year Rainfall=2.30"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 17HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Det Pond Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Inflow Area=14.034 ac Peak Elev=1,040.61' Storage=0.237 af 3.62 cfs 0.01 cfs 0.01 cfs 0.00 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 18HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=6.467 ac 10.65% Impervious Runoff Depth=1.12"Subcatchment A1: East Grass Fields & Tennis Flow Length=400' Tc=45.0 min CN=65 Runoff=4.13 cfs 0.602 af Runoff Area=0.794 ac 31.99% Impervious Runoff Depth=0.73"Subcatchment A11: Det Pond Flow Length=100' Tc=6.3 min CN=58 Runoff=0.91 cfs 0.049 af Runoff Area=0.813 ac 66.17% Impervious Runoff Depth=2.59"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=85 Runoff=1.80 cfs 0.176 af Runoff Area=5.960 ac 32.94% Impervious Runoff Depth=1.64"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=14.51 cfs 0.813 af Peak Elev=1,046.19' Inflow=14.51 cfs 0.813 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=14.51 cfs 0.813 af Peak Elev=1,060.60' Storage=0.193 af Inflow=4.13 cfs 0.602 afPond 1P: East Filtration Swale Discarded=0.12 cfs 0.237 af Primary=1.88 cfs 0.348 af Outflow=2.00 cfs 0.585 af Peak Elev=1,051.64' Storage=0.038 af Inflow=1.80 cfs 0.176 afPond 2P: West Filtration Swale Discarded=0.04 cfs 0.073 af Primary=3.12 cfs 0.103 af Outflow=3.15 cfs 0.176 af Peak Elev=1,045.50' Storage=1.171 af Inflow=15.30 cfs 1.312 afPond 3P: Det Pond Discarded=0.03 cfs 0.147 af Primary=0.33 cfs 0.125 af Outflow=0.36 cfs 0.272 af Total Runoff Area = 14.034 ac Runoff Volume = 1.638 af Average Runoff Depth = 1.40" 75.46% Pervious = 10.590 ac 24.54% Impervious = 3.444 ac Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 19HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A1: East Grass Fields & Tennis Cts Runoff =4.13 cfs @ 12.46 hrs, Volume=0.602 af, Depth=1.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 10 year Rainfall=4.15" Area (ac)CN Description 5.778 61 >75% Grass cover, Good, HSG B *0.689 98 Path 6.467 65 Weighted Average 5.778 89.35% Pervious Area 0.689 10.65% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 43.6 300 0.0150 0.11 Sheet Flow, Existing grass play field Grass: Dense n= 0.240 P2= 2.50" 1.4 100 0.0200 1.22 Sheet Flow, Paved Path Smooth surfaces n= 0.011 P2= 2.50" 45.0 400 Total Subcatchment A1: East Grass Fields & Tennis Cts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 10 year Rainfall=4.15" Runoff Area=6.467 ac Runoff Volume=0.602 af Runoff Depth=1.12" Flow Length=400' Tc=45.0 min CN=65 4.13 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 20HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A11: Det Pond Runoff =0.91 cfs @ 11.99 hrs, Volume=0.049 af, Depth=0.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 10 year Rainfall=4.15" Area (ac)CN Description *0.254 98 Pond 0.540 39 >75% Grass cover, Good, HSG A 0.794 58 Weighted Average 0.540 68.01% Pervious Area 0.254 31.99% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 1.4 50 0.0050 0.61 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 4.9 50 0.1000 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 6.3 100 Total Subcatchment A11: Det Pond Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type II 24-hr 10 year Rainfall=4.15" Runoff Area=0.794 ac Runoff Volume=0.049 af Runoff Depth=0.73" Flow Length=100' Tc=6.3 min CN=58 0.91 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 21HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A2: West Grass & Tennis Courts Runoff =1.80 cfs @ 12.24 hrs, Volume=0.176 af, Depth=2.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 10 year Rainfall=4.15" Area (ac)CN Description *0.538 98 Path 0.275 61 >75% Grass cover, Good, HSG B 0.813 85 Weighted Average 0.275 33.83% Pervious Area 0.538 66.17% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.7 300 0.0150 1.35 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 26.9 300 0.0500 0.19 Sheet Flow, West Grass Grass: Dense n= 0.240 P2= 2.50" 30.6 600 Total Subcatchment A2: West Grass & Tennis Courts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 10 year Rainfall=4.15" Runoff Area=0.813 ac Runoff Volume=0.176 af Runoff Depth=2.59" Flow Length=600' Tc=30.6 min CN=85 1.80 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 22HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A3: Main Parking Lot Runoff =14.51 cfs @ 12.03 hrs, Volume=0.813 af, Depth=1.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 10 year Rainfall=4.15" Area (ac)CN Description *1.963 98 Parking Lot 3.997 61 >75% Grass cover, Good, HSG B 5.960 73 Weighted Average 3.997 67.06% Pervious Area 1.963 32.94% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 4.4 300 0.0100 1.15 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 6.4 50 0.0200 0.13 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 10.8 350 Total Subcatchment A3: Main Parking Lot Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 10 year Rainfall=4.15" Runoff Area=5.960 ac Runoff Volume=0.813 af Runoff Depth=1.64" Flow Length=350' Tc=10.8 min CN=73 14.51 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 23HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1: [57] Hint: Peaked at 1,046.19' (Flood elevation advised) Inflow Area =5.960 ac,32.94% Impervious, Inflow Depth = 1.64" for 10 year event Inflow =14.51 cfs @ 12.03 hrs, Volume=0.813 af Outflow =14.51 cfs @ 12.03 hrs, Volume=0.813 af, Atten= 0%, Lag= 0.0 min Primary =14.51 cfs @ 12.03 hrs, Volume=0.813 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,046.19' @ 12.03 hrs Device Routing Invert Outlet Devices #1 Primary 1,043.67'24.0" Round Culvert L= 35.0' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 1,043.50' / 1,043.67' S= -0.0049 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf Primary OutFlow Max=14.50 cfs @ 12.03 hrs HW=1,046.19' TW=1,040.35' (Dynamic Tailwater) 1=Culvert (Barrel Controls 14.50 cfs @ 4.62 fps) Pond 1: Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.960 ac Peak Elev=1,046.19' 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' 14.51 cfs 14.51 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 24HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1P: East Filtration Swale Inflow Area =6.467 ac,10.65% Impervious, Inflow Depth = 1.12" for 10 year event Inflow =4.13 cfs @ 12.46 hrs, Volume=0.602 af Outflow =2.00 cfs @ 13.01 hrs, Volume=0.585 af, Atten= 52%, Lag= 33.4 min Discarded =0.12 cfs @ 12.67 hrs, Volume=0.237 af Primary =1.88 cfs @ 13.01 hrs, Volume=0.348 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,060.60' @ 13.01 hrs Surf.Area= 0.309 ac Storage= 0.193 af Plug-Flow detention time= 383.3 min calculated for 0.585 af (97% of inflow) Center-of-Mass det. time= 368.3 min ( 1,274.6 - 906.4 ) Volume Invert Avail.Storage Storage Description #1 1,059.00'0.343 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,059.00 0.040 0.000 0.000 1,060.00 0.100 0.070 0.070 1,061.00 0.447 0.273 0.343 Device Routing Invert Outlet Devices #1 Primary 1,055.00'18.0" Round Culvert L= 140.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,055.00' / 1,046.00' S= 0.0643 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 1.77 sf #2 Device 1 1,060.40'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,059.00'0.500 in/hr Exfiltration over Surface area from 1,059.00' - 1,060.50' Excluded Surface area = 0.040 ac Phase-In= 0.01' Discarded OutFlow Max=0.12 cfs @ 12.67 hrs HW=1,060.50' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.12 cfs) Primary OutFlow Max=1.88 cfs @ 13.01 hrs HW=1,060.60' TW=1,043.38' (Dynamic Tailwater) 1=Culvert (Passes 1.88 cfs of 16.54 cfs potential flow) 2=Orifice/Grate (Weir Controls 1.88 cfs @ 1.47 fps) Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 25HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 1P: East Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Inflow Area=6.467 ac Peak Elev=1,060.60' Storage=0.193 af 4.13 cfs 2.00 cfs 0.12 cfs 1.88 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 26HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 2P: West Filtration Swale [93] Warning: Storage range exceeded by 0.64' [90] Warning: Qout>Qin may require smaller dt or Finer Routing [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=121) Inflow Area =0.813 ac,66.17% Impervious, Inflow Depth = 2.59" for 10 year event Inflow =1.80 cfs @ 12.24 hrs, Volume=0.176 af Outflow =3.15 cfs @ 12.25 hrs, Volume=0.176 af, Atten= 0%, Lag= 0.4 min Discarded =0.04 cfs @ 12.25 hrs, Volume=0.073 af Primary =3.12 cfs @ 12.25 hrs, Volume=0.103 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,051.64' @ 12.25 hrs Surf.Area= 0.082 ac Storage= 0.038 af Plug-Flow detention time= 247.5 min calculated for 0.176 af (100% of inflow) Center-of-Mass det. time= 247.7 min ( 1,082.4 - 834.7 ) Volume Invert Avail.Storage Storage Description #1 1,050.00'0.038 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,050.00 0.018 0.000 0.000 1,050.50 0.027 0.011 0.011 1,051.00 0.082 0.027 0.038 Device Routing Invert Outlet Devices #1 Primary 1,046.50'12.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,046.50' / 1,046.00' S= 0.0167 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Device 1 1,050.90'24.0" Vert. Orifice/Grate C= 0.600 #3 Discarded 1,050.00'0.500 in/hr Exfiltration over Horizontal area from 1,049.00' - 1,050.90' Conductivity to Groundwater Elevation = 0.00' Excluded Horizontal area = 0.000 ac Phase-In= 0.01' Discarded OutFlow Max=0.04 cfs @ 12.25 hrs HW=1,051.64' (Free Discharge) 3=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=3.11 cfs @ 12.25 hrs HW=1,051.64' TW=1,042.07' (Dynamic Tailwater) 1=Culvert (Passes 3.11 cfs of 7.19 cfs potential flow) 2=Orifice/Grate (Orifice Controls 3.11 cfs @ 2.93 fps) Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 27HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 2P: West Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 3 2 1 0 Inflow Area=0.813 ac Peak Elev=1,051.64' Storage=0.038 af 1.80 cfs 3.15 cfs 0.04 cfs 3.12 cfs Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 28HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Det Pond [80] Warning: Exceeded Pond 1 by 1.81' @ 24.62 hrs (10.08 cfs 5.340 af) Inflow Area =14.034 ac,24.54% Impervious, Inflow Depth = 1.12" for 10 year event Inflow =15.30 cfs @ 12.03 hrs, Volume=1.312 af Outflow =0.36 cfs @ 21.07 hrs, Volume=0.272 af, Atten= 98%, Lag= 542.7 min Discarded =0.03 cfs @ 21.07 hrs, Volume=0.147 af Primary =0.33 cfs @ 21.07 hrs, Volume=0.125 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,045.50' @ 21.07 hrs Surf.Area= 0.305 ac Storage= 1.171 af Plug-Flow detention time= 1,268.8 min calculated for 0.272 af (21% of inflow) Center-of-Mass det. time= 1,111.4 min ( 1,982.9 - 871.4 ) Volume Invert Avail.Storage Storage Description #1 1,034.00'1.327 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,034.00 0.005 0.000 0.000 1,035.00 0.010 0.008 0.008 1,036.00 0.017 0.013 0.021 1,037.00 0.027 0.022 0.043 1,038.00 0.040 0.033 0.077 1,039.00 0.055 0.048 0.124 1,040.00 0.073 0.064 0.188 1,041.00 0.095 0.084 0.272 1,042.00 0.122 0.109 0.381 1,043.00 0.183 0.152 0.533 1,044.00 0.254 0.219 0.752 1,045.00 0.287 0.270 1.022 1,046.00 0.323 0.305 1.327 Device Routing Invert Outlet Devices #1 Primary 1,043.64'18.0" Round Surface Outlet L= 50.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.64' / 1,043.20' S= 0.0088 '/' Cc= 0.900 n= 0.015 Concrete, trowel finish, Flow Area= 1.77 sf #2 Device 1 1,045.44'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,034.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Phase-In= 0.01' Discarded OutFlow Max=0.03 cfs @ 21.07 hrs HW=1,045.50' (Free Discharge) 3=Exfiltration ( Controls 0.03 cfs) Primary OutFlow Max=0.33 cfs @ 21.07 hrs HW=1,045.50' (Free Discharge) 1=Surface Outlet (Passes 0.33 cfs of 7.92 cfs potential flow) 2=Orifice/Grate (Weir Controls 0.33 cfs @ 0.82 fps) Type II 24-hr 10 year Rainfall=4.15"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 29HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Det Pond Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=14.034 ac Peak Elev=1,045.50' Storage=1.171 af 15.30 cfs 0.36 cfs 0.03 cfs0.33 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 30HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=6.467 ac 10.65% Impervious Runoff Depth=2.28"Subcatchment A1: East Grass Fields & Tennis Flow Length=400' Tc=45.0 min CN=65 Runoff=9.30 cfs 1.228 af Runoff Area=0.794 ac 31.99% Impervious Runoff Depth=1.69"Subcatchment A11: Det Pond Flow Length=100' Tc=6.3 min CN=58 Runoff=2.33 cfs 0.112 af Runoff Area=0.813 ac 66.17% Impervious Runoff Depth=4.21"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=85 Runoff=2.90 cfs 0.285 af Runoff Area=5.960 ac 32.94% Impervious Runoff Depth=3.01"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=26.83 cfs 1.493 af Peak Elev=1,047.86' Inflow=26.83 cfs 1.493 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=26.83 cfs 1.493 af Peak Elev=1,060.87' Storage=0.290 af Inflow=9.30 cfs 1.228 afPond 1P: East Filtration Swale Discarded=0.12 cfs 0.247 af Primary=6.72 cfs 0.965 af Outflow=6.84 cfs 1.211 af Peak Elev=1,051.64' Storage=0.038 af Inflow=2.90 cfs 0.285 afPond 2P: West Filtration Swale Discarded=0.04 cfs 0.078 af Primary=3.06 cfs 0.207 af Outflow=3.10 cfs 0.285 af Peak Elev=1,045.94' Storage=1.308 af Inflow=30.54 cfs 2.777 afPond 3P: Det Pond Discarded=0.03 cfs 0.150 af Primary=7.29 cfs 1.585 af Outflow=7.32 cfs 1.736 af Total Runoff Area = 14.034 ac Runoff Volume = 3.118 af Average Runoff Depth = 2.67" 75.46% Pervious = 10.590 ac 24.54% Impervious = 3.444 ac Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 31HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A1: East Grass Fields & Tennis Cts Runoff =9.30 cfs @ 12.45 hrs, Volume=1.228 af, Depth=2.28" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 100 year Rainfall=5.90" Area (ac)CN Description 5.778 61 >75% Grass cover, Good, HSG B *0.689 98 Path 6.467 65 Weighted Average 5.778 89.35% Pervious Area 0.689 10.65% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 43.6 300 0.0150 0.11 Sheet Flow, Existing grass play field Grass: Dense n= 0.240 P2= 2.50" 1.4 100 0.0200 1.22 Sheet Flow, Paved Path Smooth surfaces n= 0.011 P2= 2.50" 45.0 400 Total Subcatchment A1: East Grass Fields & Tennis Cts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100 year Rainfall=5.90" Runoff Area=6.467 ac Runoff Volume=1.228 af Runoff Depth=2.28" Flow Length=400' Tc=45.0 min CN=65 9.30 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 32HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A11: Det Pond Runoff =2.33 cfs @ 11.99 hrs, Volume=0.112 af, Depth=1.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 100 year Rainfall=5.90" Area (ac)CN Description *0.254 98 Pond 0.540 39 >75% Grass cover, Good, HSG A 0.794 58 Weighted Average 0.540 68.01% Pervious Area 0.254 31.99% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 1.4 50 0.0050 0.61 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 4.9 50 0.1000 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 6.3 100 Total Subcatchment A11: Det Pond Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 100 year Rainfall=5.90" Runoff Area=0.794 ac Runoff Volume=0.112 af Runoff Depth=1.69" Flow Length=100' Tc=6.3 min CN=58 2.33 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 33HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A2: West Grass & Tennis Courts Runoff =2.90 cfs @ 12.24 hrs, Volume=0.285 af, Depth=4.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 100 year Rainfall=5.90" Area (ac)CN Description *0.538 98 Path 0.275 61 >75% Grass cover, Good, HSG B 0.813 85 Weighted Average 0.275 33.83% Pervious Area 0.538 66.17% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.7 300 0.0150 1.35 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 26.9 300 0.0500 0.19 Sheet Flow, West Grass Grass: Dense n= 0.240 P2= 2.50" 30.6 600 Total Subcatchment A2: West Grass & Tennis Courts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 3 2 1 0 Type II 24-hr 100 year Rainfall=5.90" Runoff Area=0.813 ac Runoff Volume=0.285 af Runoff Depth=4.21" Flow Length=600' Tc=30.6 min CN=85 2.90 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 34HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A3: Main Parking Lot Runoff =26.83 cfs @ 12.03 hrs, Volume=1.493 af, Depth=3.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr 100 year Rainfall=5.90" Area (ac)CN Description *1.963 98 Parking Lot 3.997 61 >75% Grass cover, Good, HSG B 5.960 73 Weighted Average 3.997 67.06% Pervious Area 1.963 32.94% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 4.4 300 0.0100 1.15 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 6.4 50 0.0200 0.13 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 10.8 350 Total Subcatchment A3: Main Parking Lot Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 100 year Rainfall=5.90" Runoff Area=5.960 ac Runoff Volume=1.493 af Runoff Depth=3.01" Flow Length=350' Tc=10.8 min CN=73 26.83 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 35HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1: [57] Hint: Peaked at 1,047.86' (Flood elevation advised) Inflow Area =5.960 ac,32.94% Impervious, Inflow Depth = 3.01" for 100 year event Inflow =26.83 cfs @ 12.03 hrs, Volume=1.493 af Outflow =26.83 cfs @ 12.03 hrs, Volume=1.493 af, Atten= 0%, Lag= 0.0 min Primary =26.83 cfs @ 12.03 hrs, Volume=1.493 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,047.86' @ 12.03 hrs Device Routing Invert Outlet Devices #1 Primary 1,043.67'24.0" Round Culvert L= 35.0' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 1,043.50' / 1,043.67' S= -0.0049 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf Primary OutFlow Max=26.80 cfs @ 12.03 hrs HW=1,047.85' TW=1,042.76' (Dynamic Tailwater) 1=Culvert (Barrel Controls 26.80 cfs @ 8.53 fps) Pond 1: Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=5.960 ac Peak Elev=1,047.86' 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' 26.83 cfs 26.83 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 36HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1P: East Filtration Swale Inflow Area =6.467 ac,10.65% Impervious, Inflow Depth = 2.28" for 100 year event Inflow =9.30 cfs @ 12.45 hrs, Volume=1.228 af Outflow =6.84 cfs @ 12.73 hrs, Volume=1.211 af, Atten= 26%, Lag= 16.7 min Discarded =0.12 cfs @ 12.33 hrs, Volume=0.247 af Primary =6.72 cfs @ 12.73 hrs, Volume=0.965 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,060.87' @ 12.73 hrs Surf.Area= 0.403 ac Storage= 0.290 af Plug-Flow detention time= 198.1 min calculated for 1.211 af (99% of inflow) Center-of-Mass det. time= 190.4 min ( 1,074.3 - 883.9 ) Volume Invert Avail.Storage Storage Description #1 1,059.00'0.343 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,059.00 0.040 0.000 0.000 1,060.00 0.100 0.070 0.070 1,061.00 0.447 0.273 0.343 Device Routing Invert Outlet Devices #1 Primary 1,055.00'18.0" Round Culvert L= 140.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,055.00' / 1,046.00' S= 0.0643 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 1.77 sf #2 Device 1 1,060.40'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,059.00'0.500 in/hr Exfiltration over Surface area from 1,059.00' - 1,060.50' Excluded Surface area = 0.040 ac Phase-In= 0.01' Discarded OutFlow Max=0.12 cfs @ 12.33 hrs HW=1,060.52' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.12 cfs) Primary OutFlow Max=6.72 cfs @ 12.73 hrs HW=1,060.87' TW=1,045.66' (Dynamic Tailwater) 1=Culvert (Passes 6.72 cfs of 17.00 cfs potential flow) 2=Orifice/Grate (Weir Controls 6.72 cfs @ 2.25 fps) Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 37HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 1P: East Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=6.467 ac Peak Elev=1,060.87' Storage=0.290 af 9.30 cfs 6.84 cfs 0.12 cfs 6.72 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 38HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 2P: West Filtration Swale [93] Warning: Storage range exceeded by 0.64' [90] Warning: Qout>Qin may require smaller dt or Finer Routing [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=217) Inflow Area =0.813 ac,66.17% Impervious, Inflow Depth = 4.21" for 100 year event Inflow =2.90 cfs @ 12.24 hrs, Volume=0.285 af Outflow =3.10 cfs @ 12.25 hrs, Volume=0.285 af, Atten= 0%, Lag= 0.5 min Discarded =0.04 cfs @ 12.25 hrs, Volume=0.078 af Primary =3.06 cfs @ 12.25 hrs, Volume=0.207 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,051.64' @ 12.25 hrs Surf.Area= 0.082 ac Storage= 0.038 af Plug-Flow detention time= 167.1 min calculated for 0.285 af (100% of inflow) Center-of-Mass det. time= 167.3 min ( 988.3 - 821.0 ) Volume Invert Avail.Storage Storage Description #1 1,050.00'0.038 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,050.00 0.018 0.000 0.000 1,050.50 0.027 0.011 0.011 1,051.00 0.082 0.027 0.038 Device Routing Invert Outlet Devices #1 Primary 1,046.50'12.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,046.50' / 1,046.00' S= 0.0167 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Device 1 1,050.90'24.0" Vert. Orifice/Grate C= 0.600 #3 Discarded 1,050.00'0.500 in/hr Exfiltration over Horizontal area from 1,049.00' - 1,050.90' Conductivity to Groundwater Elevation = 0.00' Excluded Horizontal area = 0.000 ac Phase-In= 0.01' Discarded OutFlow Max=0.04 cfs @ 12.25 hrs HW=1,051.64' (Free Discharge) 3=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=3.06 cfs @ 12.25 hrs HW=1,051.64' TW=1,044.35' (Dynamic Tailwater) 1=Culvert (Passes 3.06 cfs of 7.18 cfs potential flow) 2=Orifice/Grate (Orifice Controls 3.06 cfs @ 2.92 fps) Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 39HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 2P: West Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 3 2 1 0 Inflow Area=0.813 ac Peak Elev=1,051.64' Storage=0.038 af 2.90 cfs3.10 cfs 0.04 cfs 3.06 cfs Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 40HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Det Pond [80] Warning: Exceeded Pond 1 by 1.84' @ 24.52 hrs (10.32 cfs 6.846 af) Inflow Area =14.034 ac,24.54% Impervious, Inflow Depth = 2.37" for 100 year event Inflow =30.54 cfs @ 12.03 hrs, Volume=2.777 af Outflow =7.32 cfs @ 13.08 hrs, Volume=1.736 af, Atten= 76%, Lag= 63.1 min Discarded =0.03 cfs @ 13.08 hrs, Volume=0.150 af Primary =7.29 cfs @ 13.08 hrs, Volume=1.585 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,045.94' @ 13.08 hrs Surf.Area= 0.321 ac Storage= 1.308 af Plug-Flow detention time= 359.2 min calculated for 1.736 af (63% of inflow) Center-of-Mass det. time= 245.6 min ( 1,102.0 - 856.4 ) Volume Invert Avail.Storage Storage Description #1 1,034.00'1.327 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,034.00 0.005 0.000 0.000 1,035.00 0.010 0.008 0.008 1,036.00 0.017 0.013 0.021 1,037.00 0.027 0.022 0.043 1,038.00 0.040 0.033 0.077 1,039.00 0.055 0.048 0.124 1,040.00 0.073 0.064 0.188 1,041.00 0.095 0.084 0.272 1,042.00 0.122 0.109 0.381 1,043.00 0.183 0.152 0.533 1,044.00 0.254 0.219 0.752 1,045.00 0.287 0.270 1.022 1,046.00 0.323 0.305 1.327 Device Routing Invert Outlet Devices #1 Primary 1,043.64'18.0" Round Surface Outlet L= 50.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.64' / 1,043.20' S= 0.0088 '/' Cc= 0.900 n= 0.015 Concrete, trowel finish, Flow Area= 1.77 sf #2 Device 1 1,045.44'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,034.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Phase-In= 0.01' Discarded OutFlow Max=0.03 cfs @ 13.08 hrs HW=1,045.94' (Free Discharge) 3=Exfiltration ( Controls 0.03 cfs) Primary OutFlow Max=7.29 cfs @ 13.08 hrs HW=1,045.94' (Free Discharge) 1=Surface Outlet (Passes 7.29 cfs of 9.25 cfs potential flow) 2=Orifice/Grate (Weir Controls 7.29 cfs @ 2.32 fps) Type II 24-hr 100 year Rainfall=5.90"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 41HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Det Pond Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=14.034 ac Peak Elev=1,045.94' Storage=1.308 af 30.54 cfs 7.32 cfs 0.03 cfs 7.29 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 42HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=6.467 ac 10.65% Impervious Runoff Depth=0.00"Subcatchment A1: East Grass Fields & Tennis Flow Length=400' Tc=45.0 min CN=65 Runoff=0.00 cfs 0.000 af Runoff Area=0.794 ac 31.99% Impervious Runoff Depth=0.00"Subcatchment A11: Det Pond Flow Length=100' Tc=6.3 min CN=58 Runoff=0.00 cfs 0.000 af Runoff Area=0.813 ac 66.17% Impervious Runoff Depth=0.22"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=85 Runoff=0.12 cfs 0.015 af Runoff Area=5.960 ac 32.94% Impervious Runoff Depth=0.03"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=0.02 cfs 0.016 af Peak Elev=1,043.73' Inflow=0.02 cfs 0.016 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=0.02 cfs 0.016 af Peak Elev=1,059.00' Storage=0.000 af Inflow=0.00 cfs 0.000 afPond 1P: East Filtration Swale Discarded=0.00 cfs 0.000 af Primary=0.00 cfs 0.000 af Outflow=0.00 cfs 0.000 af Peak Elev=1,050.32' Storage=0.007 af Inflow=0.12 cfs 0.015 afPond 2P: West Filtration Swale Discarded=0.01 cfs 0.015 af Primary=0.00 cfs 0.000 af Outflow=0.01 cfs 0.015 af Peak Elev=1,035.60' Storage=0.015 af Inflow=0.02 cfs 0.016 afPond 3P: Det Pond Discarded=0.00 cfs 0.006 af Primary=0.00 cfs 0.000 af Outflow=0.00 cfs 0.006 af Total Runoff Area = 14.034 ac Runoff Volume = 0.031 af Average Runoff Depth = 0.03" 75.46% Pervious = 10.590 ac 24.54% Impervious = 3.444 ac Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 43HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A1: East Grass Fields & Tennis Cts Runoff =0.00 cfs @ 24.25 hrs, Volume=0.000 af, Depth=0.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr Abstraction Rainfall=1.10" Area (ac)CN Description 5.778 61 >75% Grass cover, Good, HSG B *0.689 98 Path 6.467 65 Weighted Average 5.778 89.35% Pervious Area 0.689 10.65% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 43.6 300 0.0150 0.11 Sheet Flow, Existing grass play field Grass: Dense n= 0.240 P2= 2.50" 1.4 100 0.0200 1.22 Sheet Flow, Paved Path Smooth surfaces n= 0.011 P2= 2.50" 45.0 400 Total Subcatchment A1: East Grass Fields & Tennis Cts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 Type II 24-hr Abstraction Rainfall=1.10" Runoff Area=6.467 ac Runoff Volume=0.000 af Runoff Depth=0.00" Flow Length=400' Tc=45.0 min CN=65 0.00 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 44HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A11: Det Pond [45] Hint: Runoff=Zero Runoff =0.00 cfs @ 0.00 hrs, Volume=0.000 af, Depth=0.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr Abstraction Rainfall=1.10" Area (ac)CN Description *0.254 98 Pond 0.540 39 >75% Grass cover, Good, HSG A 0.794 58 Weighted Average 0.540 68.01% Pervious Area 0.254 31.99% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 1.4 50 0.0050 0.61 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 4.9 50 0.1000 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 6.3 100 Total Subcatchment A11: Det Pond Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type II 24-hr Abstraction Rainfall=1.10" Runoff Area=0.794 ac Runoff Volume=0.000 af Runoff Depth=0.00" Flow Length=100' Tc=6.3 min CN=58 0.00 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 45HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A2: West Grass & Tennis Courts Runoff =0.12 cfs @ 12.30 hrs, Volume=0.015 af, Depth=0.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr Abstraction Rainfall=1.10" Area (ac)CN Description *0.538 98 Path 0.275 61 >75% Grass cover, Good, HSG B 0.813 85 Weighted Average 0.275 33.83% Pervious Area 0.538 66.17% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.7 300 0.0150 1.35 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 26.9 300 0.0500 0.19 Sheet Flow, West Grass Grass: Dense n= 0.240 P2= 2.50" 30.6 600 Total Subcatchment A2: West Grass & Tennis Courts Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr Abstraction Rainfall=1.10" Runoff Area=0.813 ac Runoff Volume=0.015 af Runoff Depth=0.22" Flow Length=600' Tc=30.6 min CN=85 0.12 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 46HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A3: Main Parking Lot Runoff =0.02 cfs @ 13.02 hrs, Volume=0.016 af, Depth=0.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Type II 24-hr Abstraction Rainfall=1.10" Area (ac)CN Description *1.963 98 Parking Lot 3.997 61 >75% Grass cover, Good, HSG B 5.960 73 Weighted Average 3.997 67.06% Pervious Area 1.963 32.94% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 4.4 300 0.0100 1.15 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 6.4 50 0.0200 0.13 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 10.8 350 Total Subcatchment A3: Main Parking Lot Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Type II 24-hr Abstraction Rainfall=1.10" Runoff Area=5.960 ac Runoff Volume=0.016 af Runoff Depth=0.03" Flow Length=350' Tc=10.8 min CN=73 0.02 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 47HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1: [57] Hint: Peaked at 1,043.73' (Flood elevation advised) Inflow Area =5.960 ac,32.94% Impervious, Inflow Depth = 0.03" for Abstraction event Inflow =0.02 cfs @ 13.02 hrs, Volume=0.016 af Outflow =0.02 cfs @ 13.02 hrs, Volume=0.016 af, Atten= 0%, Lag= 0.0 min Primary =0.02 cfs @ 13.02 hrs, Volume=0.016 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,043.73' @ 13.02 hrs Device Routing Invert Outlet Devices #1 Primary 1,043.67'24.0" Round Culvert L= 35.0' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 1,043.50' / 1,043.67' S= -0.0049 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf Primary OutFlow Max=0.02 cfs @ 13.02 hrs HW=1,043.73' TW=1,034.22' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.02 cfs @ 0.84 fps) Pond 1: Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=5.960 ac Peak Elev=1,043.73' 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' 0.02 cfs 0.02 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 48HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1P: East Filtration Swale Inflow Area =6.467 ac,10.65% Impervious, Inflow Depth = 0.00" for Abstraction event Inflow =0.00 cfs @ 24.25 hrs, Volume=0.000 af Outflow =0.00 cfs @ 25.84 hrs, Volume=0.000 af, Atten= 99%, Lag= 95.5 min Discarded =0.00 cfs @ 25.84 hrs, Volume=0.000 af Primary =0.00 cfs @ 0.00 hrs, Volume=0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,059.00' @ 25.84 hrs Surf.Area= 0.040 ac Storage= 0.000 af Plug-Flow detention time= 1,329.6 min calculated for 0.000 af (28% of inflow) Center-of-Mass det. time= 1,289.5 min ( 2,733.8 - 1,444.3 ) Volume Invert Avail.Storage Storage Description #1 1,059.00'0.343 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,059.00 0.040 0.000 0.000 1,060.00 0.100 0.070 0.070 1,061.00 0.447 0.273 0.343 Device Routing Invert Outlet Devices #1 Primary 1,055.00'18.0" Round Culvert L= 140.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,055.00' / 1,046.00' S= 0.0643 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 1.77 sf #2 Device 1 1,060.40'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,059.00'0.500 in/hr Exfiltration over Surface area from 1,059.00' - 1,060.50' Excluded Surface area = 0.040 ac Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 25.84 hrs HW=1,059.00' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,059.00' TW=1,034.00' (Dynamic Tailwater) 1=Culvert (Passes 0.00 cfs of 13.53 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 49HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 1P: East Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 Inflow Area=6.467 ac Peak Elev=1,059.00' Storage=0.000 af 0.00 cfs 0.00 cfs 0.00 cfs 0.00 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 50HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 2P: West Filtration Swale Inflow Area =0.813 ac,66.17% Impervious, Inflow Depth = 0.22" for Abstraction event Inflow =0.12 cfs @ 12.30 hrs, Volume=0.015 af Outflow =0.01 cfs @ 15.41 hrs, Volume=0.015 af, Atten= 90%, Lag= 186.5 min Discarded =0.01 cfs @ 15.41 hrs, Volume=0.015 af Primary =0.00 cfs @ 0.00 hrs, Volume=0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,050.32' @ 15.41 hrs Surf.Area= 0.024 ac Storage= 0.007 af Plug-Flow detention time= 287.3 min calculated for 0.015 af (100% of inflow) Center-of-Mass det. time= 287.3 min ( 1,198.3 - 911.0 ) Volume Invert Avail.Storage Storage Description #1 1,050.00'0.038 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,050.00 0.018 0.000 0.000 1,050.50 0.027 0.011 0.011 1,051.00 0.082 0.027 0.038 Device Routing Invert Outlet Devices #1 Primary 1,046.50'12.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,046.50' / 1,046.00' S= 0.0167 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Device 1 1,050.90'24.0" Vert. Orifice/Grate C= 0.600 #3 Discarded 1,050.00'0.500 in/hr Exfiltration over Horizontal area from 1,049.00' - 1,050.90' Conductivity to Groundwater Elevation = 0.00' Excluded Horizontal area = 0.000 ac Phase-In= 0.01' Discarded OutFlow Max=0.01 cfs @ 15.41 hrs HW=1,050.32' (Free Discharge) 3=Exfiltration ( Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,050.00' TW=1,034.00' (Dynamic Tailwater) 1=Culvert (Passes 0.00 cfs of 5.78 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 51HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 2P: West Filtration Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.813 ac Peak Elev=1,050.32' Storage=0.007 af 0.12 cfs 0.01 cfs 0.01 cfs 0.00 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 52HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Det Pond Inflow Area =14.034 ac,24.54% Impervious, Inflow Depth = 0.01" for Abstraction event Inflow =0.02 cfs @ 13.02 hrs, Volume=0.016 af Outflow =0.00 cfs @ 24.26 hrs, Volume=0.006 af, Atten= 94%, Lag= 674.5 min Discarded =0.00 cfs @ 24.26 hrs, Volume=0.006 af Primary =0.00 cfs @ 0.00 hrs, Volume=0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,035.60' @ 24.26 hrs Surf.Area= 0.014 ac Storage= 0.015 af Plug-Flow detention time= 1,702.9 min calculated for 0.006 af (39% of inflow) Center-of-Mass det. time= 1,493.9 min ( 2,545.0 - 1,051.1 ) Volume Invert Avail.Storage Storage Description #1 1,034.00'1.327 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet)(acres)(acre-feet)(acre-feet) 1,034.00 0.005 0.000 0.000 1,035.00 0.010 0.008 0.008 1,036.00 0.017 0.013 0.021 1,037.00 0.027 0.022 0.043 1,038.00 0.040 0.033 0.077 1,039.00 0.055 0.048 0.124 1,040.00 0.073 0.064 0.188 1,041.00 0.095 0.084 0.272 1,042.00 0.122 0.109 0.381 1,043.00 0.183 0.152 0.533 1,044.00 0.254 0.219 0.752 1,045.00 0.287 0.270 1.022 1,046.00 0.323 0.305 1.327 Device Routing Invert Outlet Devices #1 Primary 1,043.64'18.0" Round Surface Outlet L= 50.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.64' / 1,043.20' S= 0.0088 '/' Cc= 0.900 n= 0.015 Concrete, trowel finish, Flow Area= 1.77 sf #2 Device 1 1,045.44'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,034.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 24.26 hrs HW=1,035.60' (Free Discharge) 3=Exfiltration ( Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,034.00' (Free Discharge) 1=Surface Outlet ( Controls 0.00 cfs) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr Abstraction Rainfall=1.10"MMW Exist Pond 2003 Design 8-28-15 Printed 9/8/2015Prepared by Microsoft Page 53HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Det Pond Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=14.034 ac Peak Elev=1,035.60' Storage=0.015 af 0.02 cfs 0.00 cfs 0.00 cfs 0.00 cfs