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MMW Hydrocad Proposed North Park Lot 9-8-15A1 East Grass Fields & Tennis Cts A2 West Grass & Tennis Courts A3 Main Parking Lot A4 Proposed Parking Lot & Widened Drive 1CB 1P East Filtration Swale 2P West Filtration Swale 3P Proposed New Underground Storm Chambers Routing Diagram for MMW North Park Lot Add 9-1-15 Prepared by Microsoft, Printed 9/8/2015 HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Subcat Reach Pond Link MMW North Park Lot Add 9-1-15 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) 10.383 61 >75% Grass cover, Good, HSG B (A1, A2, A3, A4) 2.719 98 Parking Lot (A3, A4) 0.600 98 Path (A2) 0.689 98 Paved parking, HSG A (A1) 14.391 71 TOTAL AREA MMW North Park Lot Add 9-1-15 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 0.689 HSG A A1 10.383 HSG B A1, A2, A3, A4 0.000 HSG C 0.000 HSG D 3.319 Other A2, A3, A4 14.391 TOTAL AREA MMW North Park Lot Add 9-1-15 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 0.000 10.383 0.000 0.000 0.000 10.383 >75% Grass cover, Good A1, A2, A3, A4 0.000 0.000 0.000 0.000 2.719 2.719 Parking Lot A3, A4 0.000 0.000 0.000 0.000 0.600 0.600 Path A2 0.689 0.000 0.000 0.000 0.000 0.689 Paved parking A1 0.689 10.383 0.000 0.000 3.319 14.391 TOTAL AREA MMW North Park Lot Add 9-1-15 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 1,043.00 1,040.00 140.0 0.0214 0.015 18.0 0.0 0.0 Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 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=0.29"Subcatchment A1: East Grass Fields & Tennis Flow Length=400' Tc=45.0 min CN=65 Runoff=0.71 cfs 0.158 af Runoff Area=0.809 ac 74.17% Impervious Runoff Depth=1.37"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=88 Runoff=0.95 cfs 0.093 af Runoff Area=6.321 ac 33.38% Impervious Runoff Depth=0.56"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=4.83 cfs 0.296 af Runoff Area=0.794 ac 76.70% Impervious Runoff Depth=1.45"Subcatchment A4: Proposed Parking Lot & Flow Length=430' Tc=21.5 min CN=89 Runoff=1.23 cfs 0.096 af Peak Elev=1,044.80' Inflow=4.83 cfs 0.296 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=4.83 cfs 0.296 af Peak Elev=1,060.22' Storage=0.101 af Inflow=0.71 cfs 0.158 afPond 1P: East Filtration Swale Discarded=0.07 cfs 0.146 af Primary=0.00 cfs 0.000 af Outflow=0.07 cfs 0.146 af Peak Elev=1,051.25' Storage=0.038 af Inflow=0.95 cfs 0.093 afPond 2P: West Filtration Swale Discarded=0.04 cfs 0.065 af Primary=0.75 cfs 0.028 af Outflow=0.78 cfs 0.093 af Peak Elev=1,040.77' Storage=0.368 af Inflow=5.81 cfs 0.420 afPond 3P: Proposed New Underground Storm Discarded=0.04 cfs 0.226 af Primary=0.00 cfs 0.000 af Outflow=0.04 cfs 0.226 af Total Runoff Area = 14.391 ac Runoff Volume = 0.643 af Average Runoff Depth = 0.54" 72.15% Pervious = 10.383 ac 27.85% Impervious = 4.008 ac Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 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 =0.71 cfs @ 12.56 hrs, Volume=0.158 af, Depth=0.29" 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=2.49" Area (ac)CN Description 5.778 61 >75% Grass cover, Good, HSG B 0.689 98 Paved parking, HSG A 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 ) 0.75 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=2.49" Runoff Area=6.467 ac Runoff Volume=0.158 af Runoff Depth=0.29" Flow Length=400' Tc=45.0 min CN=65 0.71 cfs Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 8HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A2: West Grass & Tennis Courts Runoff =0.95 cfs @ 12.25 hrs, Volume=0.093 af, Depth=1.37" 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=2.49" Area (ac)CN Description *0.600 98 Path 0.209 61 >75% Grass cover, Good, HSG B 0.809 88 Weighted Average 0.209 25.83% Pervious Area 0.600 74.17% 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 ) 1 0 Type II 24-hr 1 year Rainfall=2.49" Runoff Area=0.809 ac Runoff Volume=0.093 af Runoff Depth=1.37" Flow Length=600' Tc=30.6 min CN=88 0.95 cfs Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 9HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A3: Main Parking Lot Runoff =4.83 cfs @ 12.04 hrs, Volume=0.296 af, Depth=0.56" 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=2.49" Area (ac)CN Description *2.110 98 Parking Lot 4.211 61 >75% Grass cover, Good, HSG B 6.321 73 Weighted Average 4.211 66.62% Pervious Area 2.110 33.38% 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 ) 5 4 3 2 1 0 Type II 24-hr 1 year Rainfall=2.49" Runoff Area=6.321 ac Runoff Volume=0.296 af Runoff Depth=0.56" Flow Length=350' Tc=10.8 min CN=73 4.83 cfs Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 10HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff =1.23 cfs @ 12.14 hrs, Volume=0.096 af, Depth=1.45" 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=2.49" Area (ac)CN Description *0.609 98 Parking Lot 0.185 61 >75% Grass cover, Good, HSG B 0.794 89 Weighted Average 0.185 23.30% Pervious Area 0.609 76.70% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.8 250 0.0100 1.11 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 17.7 180 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 21.5 430 Total Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type II 24-hr 1 year Rainfall=2.49" Runoff Area=0.794 ac Runoff Volume=0.096 af Runoff Depth=1.45" Flow Length=430' Tc=21.5 min CN=89 1.23 cfs Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 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 1,044.80' (Flood elevation advised) Inflow Area =6.321 ac,33.38% Impervious, Inflow Depth = 0.56" for 1 year event Inflow =4.83 cfs @ 12.04 hrs, Volume=0.296 af Outflow =4.83 cfs @ 12.04 hrs, Volume=0.296 af, Atten= 0%, Lag= 0.0 min Primary =4.83 cfs @ 12.04 hrs, Volume=0.296 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,044.80' @ 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=4.82 cfs @ 12.04 hrs HW=1,044.80' TW=1,039.34' (Dynamic Tailwater) 1=Culvert (Barrel Controls 4.82 cfs @ 3.17 fps) Pond 1: Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Inflow Area=6.321 ac Peak Elev=1,044.80' 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' 4.83 cfs 4.83 cfs Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 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 = 0.29" for 1 year event Inflow =0.71 cfs @ 12.56 hrs, Volume=0.158 af Outflow =0.07 cfs @ 23.19 hrs, Volume=0.146 af, Atten= 90%, Lag= 637.5 min Discarded =0.07 cfs @ 23.19 hrs, Volume=0.146 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= 1,060.22' @ 23.19 hrs Surf.Area= 0.178 ac Storage= 0.101 af Plug-Flow detention time= 1,030.9 min calculated for 0.146 af (92% of inflow) Center-of-Mass det. time= 992.7 min ( 1,953.8 - 961.1 ) 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=0.07 cfs @ 23.19 hrs HW=1,060.22' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,059.00' TW=1,039.00' (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=2.49"MMW North Park Lot Add 9-1-15 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 ) 0.75 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=6.467 ac Peak Elev=1,060.22' Storage=0.101 af 0.71 cfs 0.07 cfs 0.07 cfs 0.00 cfs Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 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 [93] Warning: Storage range exceeded by 0.25' [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=48) Inflow Area =0.809 ac,74.17% Impervious, Inflow Depth = 1.37" for 1 year event Inflow =0.95 cfs @ 12.25 hrs, Volume=0.093 af Outflow =0.78 cfs @ 12.52 hrs, Volume=0.093 af, Atten= 17%, Lag= 16.3 min Discarded =0.04 cfs @ 12.52 hrs, Volume=0.065 af Primary =0.75 cfs @ 12.52 hrs, Volume=0.028 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,051.25' @ 12.52 hrs Surf.Area= 0.082 ac Storage= 0.038 af Plug-Flow detention time= 399.3 min calculated for 0.093 af (100% of inflow) Center-of-Mass det. time= 399.4 min ( 1,244.9 - 845.5 ) 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 @ 12.52 hrs HW=1,051.25' (Free Discharge) 3=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.75 cfs @ 12.52 hrs HW=1,051.25' TW=1,039.95' (Dynamic Tailwater) 1=Culvert (Passes 0.75 cfs of 6.88 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.75 cfs @ 2.02 fps) Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 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 ) 1 0 Inflow Area=0.809 ac Peak Elev=1,051.25' Storage=0.038 af 0.95 cfs 0.78 cfs 0.04 cfs 0.75 cfs Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 16HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Proposed New Underground Storm Chambers Inflow Area =14.391 ac,27.85% Impervious, Inflow Depth = 0.35" for 1 year event Inflow =5.81 cfs @ 12.05 hrs, Volume=0.420 af Outflow =0.04 cfs @ 24.19 hrs, Volume=0.226 af, Atten= 99%, Lag= 728.6 min Discarded =0.04 cfs @ 24.19 hrs, Volume=0.226 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= 1,040.77' @ 24.19 hrs Surf.Area= 0.436 ac Storage= 0.368 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 1,590.8 min ( 2,460.5 - 869.7 ) Volume Invert Avail.Storage Storage Description #1A 1,039.00'0.726 af 144.08'W x 131.89'L x 7.00'H Field A 3.054 af Overall - 1.239 af Embedded = 1.815 af x 40.0% Voids #2A 1,040.50'1.239 af ADS_StormTech MC-4500 +Cap x 496 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Rows of 31 Chambers Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 1.965 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 1,043.00'18.0" Round Culvert L= 140.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.00' / 1,040.00' S= 0.0214 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 1.77 sf #2 Discarded 1,039.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Discarded OutFlow Max=0.04 cfs @ 24.19 hrs HW=1,040.77' (Free Discharge) 2=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,039.00' (Free Discharge) 1=Culvert ( Controls 0.00 cfs) Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 17HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with end caps) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 100.0" Wide + 7.0" Spacing = 107.0" C-C Row Spacing 31 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 129.89' Row Length +12.0" End Stone x 2 = 131.89' Base Length 16 Rows x 100.0" Wide + 7.0" Spacing x 15 + 12.0" Side Stone x 2 = 144.08' Base Width 18.0" Base + 60.0" Chamber Height + 6.0" Cover = 7.00' Field Height 496 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 16 Rows = 53,961.7 cf Chamber Storage 133,023.7 cf Field - 53,961.7 cf Chambers = 79,062.1 cf Stone x 40.0% Voids = 31,624.8 cf Stone Storage Chamber Storage + Stone Storage = 85,586.5 cf = 1.965 af Overall Storage Efficiency = 64.3% 496 Chambers 4,926.8 cy Field 2,928.2 cy Stone Type II 24-hr 1 year Rainfall=2.49"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 18HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 6 5 4 3 2 1 0 Inflow Area=14.391 ac Peak Elev=1,040.77' Storage=0.368 af 5.81 cfs 0.04 cfs 0.04 cfs 0.00 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 19HydroCAD® 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=1.16"Subcatchment A1: East Grass Fields & Tennis Flow Length=400' Tc=45.0 min CN=65 Runoff=4.34 cfs 0.628 af Runoff Area=0.809 ac 74.17% Impervious Runoff Depth=2.94"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=88 Runoff=2.03 cfs 0.198 af Runoff Area=6.321 ac 33.38% Impervious Runoff Depth=1.69"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=15.96 cfs 0.893 af Runoff Area=0.794 ac 76.70% Impervious Runoff Depth=3.04"Subcatchment A4: Proposed Parking Lot & Flow Length=430' Tc=21.5 min CN=89 Runoff=2.54 cfs 0.201 af Peak Elev=1,046.33' Inflow=15.96 cfs 0.893 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=15.96 cfs 0.893 af Peak Elev=1,060.62' Storage=0.198 af Inflow=4.34 cfs 0.628 afPond 1P: East Filtration Swale Discarded=0.12 cfs 0.238 af Primary=2.07 cfs 0.373 af Outflow=2.19 cfs 0.611 af Peak Elev=1,051.53' Storage=0.038 af Inflow=2.03 cfs 0.198 afPond 2P: West Filtration Swale Discarded=0.04 cfs 0.075 af Primary=2.30 cfs 0.124 af Outflow=2.34 cfs 0.198 af Peak Elev=1,043.33' Storage=1.295 af Inflow=17.97 cfs 1.590 afPond 3P: Proposed New Underground Storm Discarded=0.04 cfs 0.234 af Primary=0.49 cfs 0.305 af Outflow=0.53 cfs 0.539 af Total Runoff Area = 14.391 ac Runoff Volume = 1.920 af Average Runoff Depth = 1.60" 72.15% Pervious = 10.383 ac 27.85% Impervious = 4.008 ac Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 20HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A1: East Grass Fields & Tennis Cts Runoff =4.34 cfs @ 12.46 hrs, Volume=0.628 af, Depth=1.16" 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=4.23" Area (ac)CN Description 5.778 61 >75% Grass cover, Good, HSG B 0.689 98 Paved parking, HSG A 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=4.23" Runoff Area=6.467 ac Runoff Volume=0.628 af Runoff Depth=1.16" Flow Length=400' Tc=45.0 min CN=65 4.34 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 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 =2.03 cfs @ 12.24 hrs, Volume=0.198 af, Depth=2.94" 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=4.23" Area (ac)CN Description *0.600 98 Path 0.209 61 >75% Grass cover, Good, HSG B 0.809 88 Weighted Average 0.209 25.83% Pervious Area 0.600 74.17% 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=4.23" Runoff Area=0.809 ac Runoff Volume=0.198 af Runoff Depth=2.94" Flow Length=600' Tc=30.6 min CN=88 2.03 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 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 =15.96 cfs @ 12.03 hrs, Volume=0.893 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 10 year Rainfall=4.23" Area (ac)CN Description *2.110 98 Parking Lot 4.211 61 >75% Grass cover, Good, HSG B 6.321 73 Weighted Average 4.211 66.62% Pervious Area 2.110 33.38% 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 ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 10 year Rainfall=4.23" Runoff Area=6.321 ac Runoff Volume=0.893 af Runoff Depth=1.69" Flow Length=350' Tc=10.8 min CN=73 15.96 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 23HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff =2.54 cfs @ 12.14 hrs, Volume=0.201 af, Depth=3.04" 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=4.23" Area (ac)CN Description *0.609 98 Parking Lot 0.185 61 >75% Grass cover, Good, HSG B 0.794 89 Weighted Average 0.185 23.30% Pervious Area 0.609 76.70% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.8 250 0.0100 1.11 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 17.7 180 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 21.5 430 Total Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 10 year Rainfall=4.23" Runoff Area=0.794 ac Runoff Volume=0.201 af Runoff Depth=3.04" Flow Length=430' Tc=21.5 min CN=89 2.54 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 24HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1: [57] Hint: Peaked at 1,046.33' (Flood elevation advised) Inflow Area =6.321 ac,33.38% Impervious, Inflow Depth = 1.69" for 10 year event Inflow =15.96 cfs @ 12.03 hrs, Volume=0.893 af Outflow =15.96 cfs @ 12.03 hrs, Volume=0.893 af, Atten= 0%, Lag= 0.0 min Primary =15.96 cfs @ 12.03 hrs, Volume=0.893 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,046.33' @ 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=15.95 cfs @ 12.03 hrs HW=1,046.33' TW=1,040.50' (Dynamic Tailwater) 1=Culvert (Barrel Controls 15.95 cfs @ 5.08 fps) Pond 1: Inflow 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=6.321 ac Peak Elev=1,046.33' 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' 15.96 cfs 15.96 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 25HydroCAD® 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 = 1.16" for 10 year event Inflow =4.34 cfs @ 12.46 hrs, Volume=0.628 af Outflow =2.19 cfs @ 12.98 hrs, Volume=0.611 af, Atten= 50%, Lag= 31.7 min Discarded =0.12 cfs @ 12.64 hrs, Volume=0.238 af Primary =2.07 cfs @ 12.98 hrs, Volume=0.373 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,060.62' @ 12.98 hrs Surf.Area= 0.314 ac Storage= 0.198 af Plug-Flow detention time= 368.4 min calculated for 0.611 af (97% of inflow) Center-of-Mass det. time= 353.9 min ( 1,258.9 - 905.0 ) 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 @ 12.64 hrs HW=1,060.50' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.12 cfs) Primary OutFlow Max=2.07 cfs @ 12.98 hrs HW=1,060.62' TW=1,041.84' (Dynamic Tailwater) 1=Culvert (Passes 2.07 cfs of 16.56 cfs potential flow) 2=Orifice/Grate (Weir Controls 2.07 cfs @ 1.52 fps) Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 26HydroCAD® 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=1,060.62' Storage=0.198 af 4.34 cfs 2.19 cfs 0.12 cfs 2.07 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 27HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 2P: West Filtration Swale [93] Warning: Storage range exceeded by 0.53' [90] Warning: Qout>Qin may require smaller dt or Finer Routing [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=142) Inflow Area =0.809 ac,74.17% Impervious, Inflow Depth = 2.94" for 10 year event Inflow =2.03 cfs @ 12.24 hrs, Volume=0.198 af Outflow =2.34 cfs @ 12.24 hrs, Volume=0.198 af, Atten= 0%, Lag= 0.0 min Discarded =0.04 cfs @ 12.24 hrs, Volume=0.075 af Primary =2.30 cfs @ 12.24 hrs, Volume=0.124 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,051.53' @ 12.24 hrs Surf.Area= 0.082 ac Storage= 0.038 af Plug-Flow detention time= 224.7 min calculated for 0.198 af (100% of inflow) Center-of-Mass det. time= 224.7 min ( 1,048.4 - 823.8 ) 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 @ 12.24 hrs HW=1,051.53' (Free Discharge) 3=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=2.30 cfs @ 12.24 hrs HW=1,051.53' TW=1,041.10' (Dynamic Tailwater) 1=Culvert (Passes 2.30 cfs of 7.10 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.30 cfs @ 2.71 fps) Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 28HydroCAD® 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 ) 2 1 0 Inflow Area=0.809 ac Peak Elev=1,051.53' Storage=0.038 af 2.03 cfs 2.34 cfs 0.04 cfs 2.30 cfs Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 29HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Proposed New Underground Storm Chambers Inflow Area =14.391 ac,27.85% Impervious, Inflow Depth = 1.33" for 10 year event Inflow =17.97 cfs @ 12.04 hrs, Volume=1.590 af Outflow =0.53 cfs @ 19.32 hrs, Volume=0.539 af, Atten= 97%, Lag= 437.2 min Discarded =0.04 cfs @ 19.32 hrs, Volume=0.234 af Primary =0.49 cfs @ 19.32 hrs, Volume=0.305 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,043.33' @ 19.32 hrs Surf.Area= 0.436 ac Storage= 1.295 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 906.2 min ( 1,766.9 - 860.6 ) Volume Invert Avail.Storage Storage Description #1A 1,039.00'0.726 af 144.08'W x 131.89'L x 7.00'H Field A 3.054 af Overall - 1.239 af Embedded = 1.815 af x 40.0% Voids #2A 1,040.50'1.239 af ADS_StormTech MC-4500 +Cap x 496 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Rows of 31 Chambers Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 1.965 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 1,043.00'18.0" Round Culvert L= 140.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.00' / 1,040.00' S= 0.0214 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 1.77 sf #2 Discarded 1,039.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Discarded OutFlow Max=0.04 cfs @ 19.32 hrs HW=1,043.33' (Free Discharge) 2=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.49 cfs @ 19.32 hrs HW=1,043.33' (Free Discharge) 1=Culvert (Inlet Controls 0.49 cfs @ 1.72 fps) Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 30HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with end caps) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 100.0" Wide + 7.0" Spacing = 107.0" C-C Row Spacing 31 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 129.89' Row Length +12.0" End Stone x 2 = 131.89' Base Length 16 Rows x 100.0" Wide + 7.0" Spacing x 15 + 12.0" Side Stone x 2 = 144.08' Base Width 18.0" Base + 60.0" Chamber Height + 6.0" Cover = 7.00' Field Height 496 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 16 Rows = 53,961.7 cf Chamber Storage 133,023.7 cf Field - 53,961.7 cf Chambers = 79,062.1 cf Stone x 40.0% Voids = 31,624.8 cf Stone Storage Chamber Storage + Stone Storage = 85,586.5 cf = 1.965 af Overall Storage Efficiency = 64.3% 496 Chambers 4,926.8 cy Field 2,928.2 cy Stone Type II 24-hr 10 year Rainfall=4.23"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 31HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=14.391 ac Peak Elev=1,043.33' Storage=1.295 af 17.97 cfs 0.53 cfs 0.04 cfs0.49 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 32HydroCAD® 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=3.33"Subcatchment A1: East Grass Fields & Tennis Flow Length=400' Tc=45.0 min CN=65 Runoff=13.93 cfs 1.794 af Runoff Area=0.809 ac 74.17% Impervious Runoff Depth=5.88"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=88 Runoff=3.94 cfs 0.396 af Runoff Area=6.321 ac 33.38% Impervious Runoff Depth=4.19"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=39.44 cfs 2.205 af Runoff Area=0.794 ac 76.70% Impervious Runoff Depth=5.99"Subcatchment A4: Proposed Parking Lot & Flow Length=430' Tc=21.5 min CN=89 Runoff=4.84 cfs 0.396 af Peak Elev=1,051.47' Inflow=39.44 cfs 2.205 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=39.44 cfs 2.205 af Peak Elev=1,061.47' Storage=0.343 af Inflow=13.93 cfs 1.794 afPond 1P: East Filtration Swale Discarded=0.12 cfs 0.252 af Primary=15.66 cfs 1.525 af Outflow=15.78 cfs 1.777 af Peak Elev=1,051.76' Storage=0.038 af Inflow=3.94 cfs 0.396 afPond 2P: West Filtration Swale Discarded=0.04 cfs 0.083 af Primary=4.05 cfs 0.313 af Outflow=4.08 cfs 0.396 af Peak Elev=1,045.89' Storage=1.946 af Inflow=45.59 cfs 4.439 afPond 3P: Proposed New Underground Storm Discarded=0.04 cfs 0.244 af Primary=10.99 cfs 3.139 af Outflow=11.03 cfs 3.383 af Total Runoff Area = 14.391 ac Runoff Volume = 4.791 af Average Runoff Depth = 4.00" 72.15% Pervious = 10.383 ac 27.85% Impervious = 4.008 ac Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 33HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A1: East Grass Fields & Tennis Cts Runoff =13.93 cfs @ 12.45 hrs, Volume=1.794 af, Depth=3.33" 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=7.29" Area (ac)CN Description 5.778 61 >75% Grass cover, Good, HSG B 0.689 98 Paved parking, HSG A 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 ) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100 year Rainfall=7.29" Runoff Area=6.467 ac Runoff Volume=1.794 af Runoff Depth=3.33" Flow Length=400' Tc=45.0 min CN=65 13.93 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 34HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A2: West Grass & Tennis Courts Runoff =3.94 cfs @ 12.24 hrs, Volume=0.396 af, Depth=5.88" 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=7.29" Area (ac)CN Description *0.600 98 Path 0.209 61 >75% Grass cover, Good, HSG B 0.809 88 Weighted Average 0.209 25.83% Pervious Area 0.600 74.17% 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 ) 4 3 2 1 0 Type II 24-hr 100 year Rainfall=7.29" Runoff Area=0.809 ac Runoff Volume=0.396 af Runoff Depth=5.88" Flow Length=600' Tc=30.6 min CN=88 3.94 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 35HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A3: Main Parking Lot Runoff =39.44 cfs @ 12.03 hrs, Volume=2.205 af, Depth=4.19" 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=7.29" Area (ac)CN Description *2.110 98 Parking Lot 4.211 61 >75% Grass cover, Good, HSG B 6.321 73 Weighted Average 4.211 66.62% Pervious Area 2.110 33.38% 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 ) 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 100 year Rainfall=7.29" Runoff Area=6.321 ac Runoff Volume=2.205 af Runoff Depth=4.19" Flow Length=350' Tc=10.8 min CN=73 39.44 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 36HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff =4.84 cfs @ 12.13 hrs, Volume=0.396 af, Depth=5.99" 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=7.29" Area (ac)CN Description *0.609 98 Parking Lot 0.185 61 >75% Grass cover, Good, HSG B 0.794 89 Weighted Average 0.185 23.30% Pervious Area 0.609 76.70% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.8 250 0.0100 1.11 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 17.7 180 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 21.5 430 Total Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Type II 24-hr 100 year Rainfall=7.29" Runoff Area=0.794 ac Runoff Volume=0.396 af Runoff Depth=5.99" Flow Length=430' Tc=21.5 min CN=89 4.84 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 37HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1: [57] Hint: Peaked at 1,051.47' (Flood elevation advised) Inflow Area =6.321 ac,33.38% Impervious, Inflow Depth = 4.19" for 100 year event Inflow =39.44 cfs @ 12.03 hrs, Volume=2.205 af Outflow =39.44 cfs @ 12.03 hrs, Volume=2.205 af, Atten= 0%, Lag= 0.0 min Primary =39.44 cfs @ 12.03 hrs, Volume=2.205 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,051.47' @ 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=39.39 cfs @ 12.03 hrs HW=1,051.45' TW=1,042.06' (Dynamic Tailwater) 1=Culvert (Inlet Controls 39.39 cfs @ 12.54 fps) Pond 1: Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=6.321 ac Peak Elev=1,051.47' 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' 39.44 cfs 39.44 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 38HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 1P: East Filtration Swale [93] Warning: Storage range exceeded by 0.47' [90] Warning: Qout>Qin may require smaller dt or Finer Routing [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=9) Inflow Area =6.467 ac,10.65% Impervious, Inflow Depth = 3.33" for 100 year event Inflow =13.93 cfs @ 12.45 hrs, Volume=1.794 af Outflow =15.78 cfs @ 12.51 hrs, Volume=1.777 af, Atten= 0%, Lag= 3.7 min Discarded =0.12 cfs @ 12.19 hrs, Volume=0.252 af Primary =15.66 cfs @ 12.51 hrs, Volume=1.525 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,061.47' @ 12.51 hrs Surf.Area= 0.447 ac Storage= 0.343 af Plug-Flow detention time= 142.1 min calculated for 1.777 af (99% of inflow) Center-of-Mass det. time= 136.4 min ( 1,009.2 - 872.8 ) 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 @ 12.19 hrs HW=1,060.52' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.12 cfs) Primary OutFlow Max=15.66 cfs @ 12.51 hrs HW=1,061.47' TW=1,044.74' (Dynamic Tailwater) 1=Culvert (Passes 15.66 cfs of 17.96 cfs potential flow) 2=Orifice/Grate (Orifice Controls 15.66 cfs @ 4.99 fps) Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 39HydroCAD® 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 ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=6.467 ac Peak Elev=1,061.47' Storage=0.343 af 13.93 cfs 15.78 cfs 0.12 cfs 15.66 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 40HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 2P: West Filtration Swale [93] Warning: Storage range exceeded by 0.76' [90] Warning: Qout>Qin may require smaller dt or Finer Routing [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=331) Inflow Area =0.809 ac,74.17% Impervious, Inflow Depth = 5.88" for 100 year event Inflow =3.94 cfs @ 12.24 hrs, Volume=0.396 af Outflow =4.08 cfs @ 12.24 hrs, Volume=0.396 af, Atten= 0%, Lag= 0.1 min Discarded =0.04 cfs @ 12.24 hrs, Volume=0.083 af Primary =4.05 cfs @ 12.24 hrs, Volume=0.313 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,051.76' @ 12.24 hrs Surf.Area= 0.082 ac Storage= 0.038 af Plug-Flow detention time= 130.9 min calculated for 0.396 af (100% of inflow) Center-of-Mass det. time= 131.0 min ( 935.6 - 804.5 ) 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 @ 12.24 hrs HW=1,051.76' (Free Discharge) 3=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=4.05 cfs @ 12.24 hrs HW=1,051.76' TW=1,043.69' (Dynamic Tailwater) 1=Culvert (Passes 4.05 cfs of 7.28 cfs potential flow) 2=Orifice/Grate (Orifice Controls 4.05 cfs @ 3.15 fps) Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 41HydroCAD® 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 ) 4 3 2 1 0 Inflow Area=0.809 ac Peak Elev=1,051.76' Storage=0.038 af 3.94 cfs4.08 cfs 0.04 cfs 4.05 cfs Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 42HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Proposed New Underground Storm Chambers Inflow Area =14.391 ac,27.85% Impervious, Inflow Depth = 3.70" for 100 year event Inflow =45.59 cfs @ 12.04 hrs, Volume=4.439 af Outflow =11.03 cfs @ 13.05 hrs, Volume=3.383 af, Atten= 76%, Lag= 60.9 min Discarded =0.04 cfs @ 13.05 hrs, Volume=0.244 af Primary =10.99 cfs @ 13.05 hrs, Volume=3.139 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 1,045.89' @ 13.05 hrs Surf.Area= 0.436 ac Storage= 1.946 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 210.0 min ( 1,052.0 - 842.0 ) Volume Invert Avail.Storage Storage Description #1A 1,039.00'0.726 af 144.08'W x 131.89'L x 7.00'H Field A 3.054 af Overall - 1.239 af Embedded = 1.815 af x 40.0% Voids #2A 1,040.50'1.239 af ADS_StormTech MC-4500 +Cap x 496 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Rows of 31 Chambers Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 1.965 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 1,043.00'18.0" Round Culvert L= 140.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.00' / 1,040.00' S= 0.0214 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 1.77 sf #2 Discarded 1,039.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Discarded OutFlow Max=0.04 cfs @ 13.05 hrs HW=1,045.89' (Free Discharge) 2=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=10.99 cfs @ 13.05 hrs HW=1,045.89' (Free Discharge) 1=Culvert (Inlet Controls 10.99 cfs @ 6.22 fps) Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 43HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with end caps) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 100.0" Wide + 7.0" Spacing = 107.0" C-C Row Spacing 31 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 129.89' Row Length +12.0" End Stone x 2 = 131.89' Base Length 16 Rows x 100.0" Wide + 7.0" Spacing x 15 + 12.0" Side Stone x 2 = 144.08' Base Width 18.0" Base + 60.0" Chamber Height + 6.0" Cover = 7.00' Field Height 496 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 16 Rows = 53,961.7 cf Chamber Storage 133,023.7 cf Field - 53,961.7 cf Chambers = 79,062.1 cf Stone x 40.0% Voids = 31,624.8 cf Stone Storage Chamber Storage + Stone Storage = 85,586.5 cf = 1.965 af Overall Storage Efficiency = 64.3% 496 Chambers 4,926.8 cy Field 2,928.2 cy Stone Type II 24-hr 100 year Rainfall=7.29"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 44HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=14.391 ac Peak Elev=1,045.89' Storage=1.946 af 45.59 cfs 11.03 cfs 0.04 cfs 10.99 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 45HydroCAD® 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=0.809 ac 74.17% Impervious Runoff Depth=0.31"Subcatchment A2: West Grass & Tennis Courts Flow Length=600' Tc=30.6 min CN=88 Runoff=0.19 cfs 0.021 af Runoff Area=6.321 ac 33.38% Impervious Runoff Depth=0.03"Subcatchment A3: Main Parking Lot Flow Length=350' Tc=10.8 min CN=73 Runoff=0.02 cfs 0.017 af Runoff Area=0.794 ac 76.70% Impervious Runoff Depth=0.35"Subcatchment A4: Proposed Parking Lot & Flow Length=430' Tc=21.5 min CN=89 Runoff=0.28 cfs 0.023 af Peak Elev=1,043.73' Inflow=0.02 cfs 0.017 afPond 1: 24.0" Round Culvert n=0.015 L=35.0' S=-0.0049 '/' Outflow=0.02 cfs 0.017 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=1,050.49' Storage=0.011 af Inflow=0.19 cfs 0.021 afPond 2P: West Filtration Swale Discarded=0.01 cfs 0.021 af Primary=0.00 cfs 0.000 af Outflow=0.01 cfs 0.021 af Peak Elev=1,039.05' Storage=0.010 af Inflow=0.28 cfs 0.040 afPond 3P: Proposed New Underground Storm Discarded=0.04 cfs 0.040 af Primary=0.00 cfs 0.000 af Outflow=0.04 cfs 0.040 af Total Runoff Area = 14.391 ac Runoff Volume = 0.061 af Average Runoff Depth = 0.05" 72.15% Pervious = 10.383 ac 27.85% Impervious = 4.008 ac Type II 24-hr Abstraction Rainfall=1.10"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 46HydroCAD® 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 Paved parking, HSG A 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 North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 47HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A2: West Grass & Tennis Courts Runoff =0.19 cfs @ 12.28 hrs, Volume=0.021 af, Depth=0.31" 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 *0.600 98 Path 0.209 61 >75% Grass cover, Good, HSG B 0.809 88 Weighted Average 0.209 25.83% Pervious Area 0.600 74.17% 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 ) 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 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=0.809 ac Runoff Volume=0.021 af Runoff Depth=0.31" Flow Length=600' Tc=30.6 min CN=88 0.19 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 48HydroCAD® 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=0.017 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 *2.110 98 Parking Lot 4.211 61 >75% Grass cover, Good, HSG B 6.321 73 Weighted Average 4.211 66.62% Pervious Area 2.110 33.38% 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=6.321 ac Runoff Volume=0.017 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 North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 49HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff =0.28 cfs @ 12.16 hrs, Volume=0.023 af, Depth=0.35" 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 *0.609 98 Parking Lot 0.185 61 >75% Grass cover, Good, HSG B 0.794 89 Weighted Average 0.185 23.30% Pervious Area 0.609 76.70% Impervious Area Tc Length Slope Velocity Capacity Description (min)(feet)(ft/ft)(ft/sec)(cfs) 3.8 250 0.0100 1.11 Sheet Flow, Minnetonka HS Smooth surfaces n= 0.011 P2= 2.50" 17.7 180 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.50" 21.5 430 Total Subcatchment A4: Proposed Parking Lot & Widened Drive Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr Abstraction Rainfall=1.10" Runoff Area=0.794 ac Runoff Volume=0.023 af Runoff Depth=0.35" Flow Length=430' Tc=21.5 min CN=89 0.28 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 50HydroCAD® 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 =6.321 ac,33.38% Impervious, Inflow Depth = 0.03" for Abstraction event Inflow =0.02 cfs @ 13.02 hrs, Volume=0.017 af Outflow =0.02 cfs @ 13.02 hrs, Volume=0.017 af, Atten= 0%, Lag= 0.0 min Primary =0.02 cfs @ 13.02 hrs, Volume=0.017 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=1,039.05' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.02 cfs @ 0.85 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=6.321 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 North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 51HydroCAD® 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=1,039.00' (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 North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 52HydroCAD® 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 North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 53HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 2P: West Filtration Swale Inflow Area =0.809 ac,74.17% Impervious, Inflow Depth = 0.31" for Abstraction event Inflow =0.19 cfs @ 12.28 hrs, Volume=0.021 af Outflow =0.01 cfs @ 15.87 hrs, Volume=0.021 af, Atten= 93%, Lag= 216.0 min Discarded =0.01 cfs @ 15.87 hrs, Volume=0.021 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= 1,050.49' @ 15.87 hrs Surf.Area= 0.027 ac Storage= 0.011 af Plug-Flow detention time= 423.8 min calculated for 0.021 af (100% of inflow) Center-of-Mass det. time= 423.8 min ( 1,313.5 - 889.7 ) 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=0.01 cfs @ 15.87 hrs HW=1,050.49' (Free Discharge) 3=Exfiltration ( Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,050.00' TW=1,039.00' (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 North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 54HydroCAD® 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 ) 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.809 ac Peak Elev=1,050.49' Storage=0.011 af 0.19 cfs 0.01 cfs 0.01 cfs 0.00 cfs Type II 24-hr Abstraction Rainfall=1.10"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 55HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Summary for Pond 3P: Proposed New Underground Storm Chambers [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=164) Inflow Area =14.391 ac,27.85% Impervious, Inflow Depth = 0.03" for Abstraction event Inflow =0.28 cfs @ 12.16 hrs, Volume=0.040 af Outflow =0.04 cfs @ 14.01 hrs, Volume=0.040 af, Atten= 84%, Lag= 110.8 min Discarded =0.04 cfs @ 14.01 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= 1,039.05' @ 14.01 hrs Surf.Area= 0.436 ac Storage= 0.010 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 89.6 min ( 1,038.7 - 949.2 ) Volume Invert Avail.Storage Storage Description #1A 1,039.00'0.726 af 144.08'W x 131.89'L x 7.00'H Field A 3.054 af Overall - 1.239 af Embedded = 1.815 af x 40.0% Voids #2A 1,040.50'1.239 af ADS_StormTech MC-4500 +Cap x 496 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 16 Rows of 31 Chambers Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 1.965 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 1,043.00'18.0" Round Culvert L= 140.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 1,043.00' / 1,040.00' S= 0.0214 '/' Cc= 0.900 n= 0.015 Concrete sewer w/manholes & inlets, Flow Area= 1.77 sf #2 Discarded 1,039.00'0.100 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 0.00' Discarded OutFlow Max=0.04 cfs @ 14.01 hrs HW=1,039.05' (Free Discharge) 2=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=1,039.00' (Free Discharge) 1=Culvert ( Controls 0.00 cfs) Type II 24-hr Abstraction Rainfall=1.10"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 56HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-4500 +Cap (ADS StormTech® MC-4500 with end caps) Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap Cap Storage= +35.7 cf x 2 x 16 rows = 1,142.4 cf 100.0" Wide + 7.0" Spacing = 107.0" C-C Row Spacing 31 Chambers/Row x 4.02' Long +2.56' Cap Length x 2 = 129.89' Row Length +12.0" End Stone x 2 = 131.89' Base Length 16 Rows x 100.0" Wide + 7.0" Spacing x 15 + 12.0" Side Stone x 2 = 144.08' Base Width 18.0" Base + 60.0" Chamber Height + 6.0" Cover = 7.00' Field Height 496 Chambers x 106.5 cf + 35.7 cf Cap Volume x 2 x 16 Rows = 53,961.7 cf Chamber Storage 133,023.7 cf Field - 53,961.7 cf Chambers = 79,062.1 cf Stone x 40.0% Voids = 31,624.8 cf Stone Storage Chamber Storage + Stone Storage = 85,586.5 cf = 1.965 af Overall Storage Efficiency = 64.3% 496 Chambers 4,926.8 cy Field 2,928.2 cy Stone Type II 24-hr Abstraction Rainfall=1.10"MMW North Park Lot Add 9-1-15 Printed 9/8/2015Prepared by Microsoft Page 57HydroCAD® 10.00-12 s/n 06027 © 2014 HydroCAD Software Solutions LLC Pond 3P: Proposed New Underground Storm Chambers Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=14.391 ac Peak Elev=1,039.05' Storage=0.010 af 0.28 cfs 0.04 cfs 0.04 cfs 0.00 cfs