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Stormwater Calculations East Courts• %�a ar i�Lia DEC 0 11 2010 ENGINES -FLING DEPT. 1 S -P Proposed I qew 4 East Tennis Courts 1P Filtratio Swale 2L Total Runoff to Existing Pond 1 S -E Existing Grass Play Ai ea 1L Total Runoff Subcat Reach on Link MMW FILT SWALE EAST COURTS 11 -16 -10 Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment- numbers) 0.650 74 >75% Grass cover, Good, HSG C (1 S -E) 0.650 98 Paved parking, HSG A (1 S -P) 1.300 TOTAL AREA MMW FILT SWALE EAST COURTS 11 -16 -10 Prepared by Inspec HvdroCADO 9.00 s/n 06027 © 2009 HvdroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Goup Subcatchment Numbers 0.650 HSG A 1 S -P 0.000 HSG B 0.650 HSG C 1 S -E 0.000 HSG D 0.000 Other 1.300 TOTAL AREA Printed 12/3/2010 Paae 3 MMW FILT SWALE EAST COURTS 11 -16 -10 Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 @2009 HydroCAD Software Solutions LLC Page 4 Pipe Listing (all nodes) Line# Node In- Invert Out - Invert Length Slope n DiamMidth Height Number (feet) (feet) (feet) (ft/ft) (inches) (inche 1 1 P 1,055.00 1,046.00 140.0 0.0643 0.010 18.0 0.0 MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 1 year Rainfall = 2.30" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 5 Time span =0.00 -72.00 hrs, dt =0.01 hrs, 7201 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment 1S -E: Existing Grass Play Runoff Area =0.650 ac 0.00% Impervious Runoff Depth = 0.50" Flow Length =300' Slope= 0.0150 '/' Tc =30.0 min CN =74 Runoff =0.23 cfs 0.027 of Subcatchment 1S -P: Proposed New 4 Runoff Area =0.650 ac 100.00% Impervious Runoff Depth= 2.07" Flow Length =300' Slope= 0.0150 '/' Tc =3.7 min CN =98 Runoff =2.25 cfs 0.112 of Pond 1P: Filtration Swale Peak Elev= 1,060.05' Storage =0.075 of Inflow =2.25 cfs 0.112 of Discarded =0.06 cfs 0.111 of Primary =0.00 cfs 0.000 of Outflow =0.06 cfs 0.111 of Link 1 L: Total Runoff Link 2L: Total Runoff to Existing Pond Inflow =0.23 cfs 0.027 of Primary =0.23 cfs 0.027 of Inflow =0.00 cfs 0.000 of Primary =0.00 cfs 0.000 of Total Runoff Area = 1.300 ac Runoff Volume = 0.139 of Average Runoff Depth = 1.29" 50.00% Pervious = 0.650 ac 50.00% Impervious = 0.650 ac MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 1 year Rainfall = 2.30" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1 S -E: Existing Grass Play Area Runoff = 0.23 cfs @ 12.30 hrs, Volume= 0.027 af, Depth= 0.50" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Type II 24 -hr 1 year Rainfall= 2.30" Area (ac) CN Description 0.650 74 >75% Grass cover, Good, HSG C 0.650 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 300 0.0150 0.17 Sheet Flow, Existing grass play field Grass: Short n=0.150 P2=2.50" Subcatchment 1S -E: Existing Grass Play Area Hydrograph 0.25 0.24-- 0.23 cfs 0.23 0.22- 0.21- Type II 24 -hr 1 year 019 = Rainfall =2.30 0.18 0.17' Runoff Area= 0.650 ac 0.16: 0.15= Runoff Volume =0.027 of .� 0.14 0.13= Runoff Depth= 0.50" 0 0.12 - 0.11 Flow Length =300' 0.1= 0.09: _ Slope= 0.0150 '/' 0.08- 0.07= 0.06- Tc =30.0 min 0.05 = - - CN =74 0.04- 0.03_ -- - - - -,- 0.02 0.01- 0= 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) — Runoff MMW F1 LT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 1 year Rainfall = 2.30" Prepared by Inspec Printed 12/3/2010 HydroCAD@ 9.00 s/n 06027 @ 2009 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 1 S -P: Proposed New 4 East Tennis Courts Runoff = 2.25 cfs @ 11.94 hrs, Volume= 0.112 af, Depth= 2.07" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Type II 24 -hr 1 year Rainfall= 2.30" Area (ac) CN Description 0.650 98 Paved parking, HSG A 0.650 100.00% 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" Subcatchment 1S -P: Proposed New 4 East Tennis Courts Hydrograph N 3 a LL 0 2 4 6 8 1012141618202224262830323436384042444648505254565860626466687072 Time (hours) 2.25 cfs 2- Type II 24 -hr 1 year Rainfall= 2.30" Runoff Area =0.650 ac Runoff Volume =0.112 of Runoff Depth= 2.07" Flow Length =300' Slope= 0.0150 '/' Tc =3.7 min CN =98 0- .. .. — Runoff MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 1 year Rainfall = 2.30" Prepared by Inspec Printed 12/3/2010 HydroCADO 9.00 s/n 06027 © 2009 HydroCAD Software Solutions LLC Page 8 Summary for Pond 1 P: Filtration Swale Inflow Area = 0.650 ac,100.00% Impervious, Inflow Depth= 2.07" for 1 year event Inflow = 2.25 cfs @ 11.94 hrs, Volume= 0.112 of Outflow = 0.06 cfs @ 13.86 hrs, Volume= 0.111 af, Atten= 97 %, Lag= 115.3 min Discarded = 0.06 cfs @ 13.86 hrs, Volume= 0.111 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Peak Elev= 1,060.05' @ 13.86 hrs Surf.Area= 0.116 ac Storage= 0.075 of Plug -Flow detention time= 863.5 min calculated for 0.111 of (99% of inflow) Center -of -Mass det. time= 857.4 min ( 1,615.4 - 758.0 ) Volume Invert Avail.Storage Storage Description #1 1,059.00' 0.335 of 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 0.430 0.265 0.335 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 Outlet Invert= 1,046.00' S= 0.06437' Cc= 0.900 n= 0.010 PVC, smooth interior #2 Device 1 1,060.90' 24.0" Horiz. Orifice /Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,059.00' 0.800 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 =0.06 cfs @ 13.86 hrs HW= 1,060.05' (Free Discharge) L3= Exfiltration (Exfiltration Controls 0.06 cfs) Z Primary OutFlow Max =0.00 cfs @ 0.00 hrs HW= 1,059.00' (Free Discharge) =Culvert (Passes 0.00 cfs of 13.53 cfs potential flow) L2= Orifice /Grate ( Controls 0.00 cfs) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 1 year Rainfall = 2.30" Prepared by Inspec Printed 12/3/2010 HydroCAD0 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 9 Pond 1 P: Filtration Swale Hydrograph — Inflow — Outflow — Discarded — Primary N U 3 O LL 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW Fl LT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 1 year Rainfall = 2.30" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 10 Summary for Link 1 L: Total Runoff Inflow Area = 0.650 ac, 0.00% Impervious, Inflow Depth = 0.50" for 1 year event Inflow = 0.23 cfs @ 12.30 hrs, Volume= 0.027 of Primary = 0.23 cfs @ 12.30 hrs, Volume= 0.027 af, Atten= 0 %, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Link 1 L: Total Runoff Hydrograph — Inflow Primary N V 3 0 U- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW Fl LT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 1 year Rainfall = 2.30" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 11 Summary for Link 2L: Total Runoff to Existing Pond Inflow Area = 0.650 ac,100.00% Impervious, Inflow Depth= 0.00" for 1 year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0 %, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Link 2L: Total Runoff to Existing Pond N 3 0 1 0.00 cfs I Hydrograph i I � 1 I I I I Inflow Area =0.650 ac I 1 I I I I I I I I I I I I I I I I I I I I 1 I I 1 I I I 1 I I I I I I I I I I 1 I I I 1 I 1 I i I 1 I I I I I I I I t I I I 1 I I I I I I I 1 I I I I I I I I I 1 I I I I I I I I I I I I I I I 1 I I I I I I I I I I 1 t I I I I I I I I I 1 I I I I I 1 I I I I I I I I I - I 1 I I I I 1 I I I I I I I I I I I I I E 1 I I I 1 I I I I I I I I I E I 1 I I 1 I I f I I I I I I I I I I I 1 I I 1 I I I I I — Inflow Primary 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 10 year Rainfall = 4.10" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 12 Time span =0.00 -72.00 hrs, dt =0.01 hrs, 7201 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment 1S -E: Existing Grass Play Runoff Area =0.650 ac 0.00% Impervious Runoff Depth= 1.67" Flow Length =300' Slope= 0.0150 '/' Tc =30.0 min CN =74 Runoff =0.91 cfs 0.090 of Subcatchment 1S -P: Proposed New 4 Runoff Area =0.650 ac 100.00% Impervious Runoff Depth= 3.86" Flow Length =300' Slope= 0.0150 '/' Tc =3.7 min CN =98 Runoff =4.07 cfs 0.209 of Pond 1 P: Filtration Swale Peak Elev= 1,060.39' Storage =0.135 of Inflow =4.07 cfs 0.209 of Discarded =0.15 cfs 0.208 of Primary =0.00 cfs 0.000 of Outflow =0.15 cfs 0.208 of Link 1 L: Total Runoff Inflow =0.91 cfs 0.090 of Primary =0.91 cfs 0.090 of Link 2L: Total Runoff to Existing Pond Inflow =0.00 cfs 0.000 of Primary =0.00 cfs 0.000 of Total Runoff Area = 1.300 ac Runoff Volume = 0.300 of Average Runoff Depth = 2.77" 50.00% Pervious = 0.650 ac 50.00% Impervious = 0.650 ac MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 10 year Rainfall=4. 10 " Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 © 2009 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment 1S -E: Existing Grass Play Area Runoff = 0.91 cfs @ 12.24 hrs, Volume= 0.090 af, Depth= 1.67" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Type II 24 -hr 10 year Rainfall= 4.10" Area (ac) CN Description 0.650 74 >75% Grass cover, Good, HSG C 0.650 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 300 0.0150 0.17 Sheet Flow, Existing grass play field Grass: Short n=0.150 P2=2.50" Subcatchment 1S-E: Existing Grass Play Area Hydrograph N 3 0 LL Type 11 24-hr 10 year Rainfall= 4.10 Runoff Area =0.650 ac Runoff Volume =0.090 of Runoff Depth = 1.67" Flow Length =300' Slope= 0.0150 T Tc =30.0 min CN =74 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) — Runoff MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 10 year Rainfall = 4.10" Prepared by Inspec Printed 12/3/2010 HydroCADO 9.00 s/n 06027 @ 2009 HydroCAD Software Solutions LLC Page 14 Summary for Subcatchment 1S -P: Proposed New 4 East Tennis Courts Runoff = 4.07 cfs @ 11.94 hrs, Volume= 0.209 af, Depth= 3.86" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Type II 24 -hr 10 year Rainfall= 4.10" Area (ac) CN Description 0.650 98 Paved parking, HSG A 0.650 100.00% 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" Subcatchment 1S -P: Proposed New 4 East Tennis Courts Hydrograph N U 3 0 LL Type II 24 -hr 10 year Rainfall= 4.10 Runoff Area =0.650 ac Runoff Volume =0.209 of Runoff Depth = 3.86" Flow Length =300' Slope= 0.0150 IT Tc =3.7 min CN =98 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) — Runoff MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 10 year Rainfall=4. 10 " Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 @ 2009 HydroCAD Software Solutions LLC Page 15 Summary for Pond 1 P: Filtration Swale Inflow Area = 0.650 ac,100.00% Impervious, Inflow Depth = 3.86" for 10 year event Inflow = 4.07 cfs @ 11.94 hrs, Volume= 0.209 of Outflow = 0.15 cfs @ 13.20 hrs, Volume= 0.208 af, Atten= 96 %, Lag= 75.4 min Discarded = 0.15 cfs @ 13.20 hrs, Volume= 0.208 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Peak Elev= 1,060.39' @ 13.20 hrs Surf.Area= 0.229 ac Storage= 0.135 of Plug -Flow detention time= 726.4 min calculated for 0.208 of (99% of inflow) Center -of -Mass det. time= 720.7 min ( 1,466.0 - 745.4 ) Volume Invert Avail.Storage Storage Description #1 1,059.00' 0.335 of 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 0.430 0.265 0.335 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 Outlet Invert= 1,046.00' S= 0.06437' Cc= 0.900 n= 0.010 PVC, smooth interior #2 Device 1 1,060.90' 24.0" Horiz. Orifice /Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,059.00' 0.800 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 =0.15 cfs @ 13.20 hrs HW= 1,060.39' (Free Discharge) t-3= Exfiltration (Exfiltration Controls 0.15 cfs) Primary OutFlow Max =0.00 cfs @ 0.00 hrs HW= 1,059.00' (Free Discharge) 't--1 =Culvert (Passes 0.00 cfs of 13.53 cfs potential flow) t-2= Orifice /Grate ( Controls 0.00 cfs) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 10 year Rainfall = 4.10" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 16 Pond 1 P: Filtration Swale Hydrograph — Inflow — Outflow — Discarded — Primary N V 3 0 LL 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW Fl LT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 10 year Rainfall=4. 10 " Prepared by Inspec Printed 12/3/2010 HydroCADO 9.00 s/n 06027 © 2009 HydroCAD Software Solutions LLC Page 17 Summary for Link 1 L: Total Runoff Inflow Area = 0.650 ac, 0.00% Impervious, Inflow Depth = 1.67" for 10 year event Inflow = 0.91 cfs @ 12.24 hrs, Volume= 0.090 of Primary = 0.91 cfs @ 12.24 hrs, Volume= 0.090 af, Atten= 0 %, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Link 1 L: Total Runoff Hydrograph N U 3 0 LL F - 1 nflow Primary 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 10 year Rainfall=4. 10 " Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 @2009 HydroCAD Software Solutions LLC Page 18 Summary for Link 2L: Total Runoff to Existing Pond Inflow Area = 0.650 ac,100.00% Impervious, Inflow Depth = 0.00" for 10 year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0 %, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs 0 N O I Y. Link 2L: Total Runoff to Existing Pond Hydrograph I I I I I I I I I I I I I I I I I I I ! Inflow Area =0.6 I I I I I 1 I I I I I I I 1 I I I I I I I I I I I 1 I I I I I I I 1 1 4 I I I I I I I I I I 1 I I I 1 I I I 1 I 1 I I I 1 I ! I 1 I I I I I I I I I t I I I I I I I I t I 1 I I I I I 1 I I I 1 1 I I t I I I I I ! t I I I I I I I I I I I I I 1 I I 1 I I I I I I I I I I I I I I I I 1 I I ! I I I I I I I I I I I I I I I I 1 I I I I I I F 1 I I I I I I I i I I I I I 1 I I 1 I ! I 1 1 I I I I I I I I I I i I I I I I 1 1 I I 1 I I I I I I I I I I I I I I I I I I ! I I i I I I I I I I I I I 1 I 1 I I I 1 I 1 I I i I I I I I I ! I I I 1 I I I I I ! I 1 I 50 ac I I 1 I I 1 I 1 I I 1 I I I 1 I I I 1 I I I I I I I 1 I I I I I I I I I I I I I I 1 1 I I I I I I I I I I I I I I I I I I I I i I I I I I I I i I I I I I 1 I i I I I I I I ( I I I I I I I I I I 1 I I I I I I I 1 ! — Inflow Primary 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 11 24 -hr 100 year Rainfall = 5.90" Prepared by Inspec Printed 12/3/2010 HydroCADO 9.00 s/n 06027 0 2009 HydroCAD Software Solutions LLC Page 19 Time span =0.00 -72.00 hrs, dt =0.01 hrs, 7201 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment 1S -E: Existing Grass Play Runoff Area =0.650 ac 0.00% Impervious Runoff Depth= 3.10" Flow Length =300' Slope= 0.0150 '/' Tc =30.0 min CN =74 Runoff =1.75 cfs 0.168 of Subcatchment 1S -P: Proposed New 4 Runoff Area =0.650 ac 100.00% Impervious Runoff Depth = 5.66" Flow Length =300' Slope= 0.0150 '/' Tc =3.7 min CN =98 Runoff =5.88 cfs 0.307 of Pond 1 P: Filtration Swale Peak Elev= 1,060.64' Storage =0.202 of Inflow =5.88 cfs 0.307 of Discarded =0.18 cfs 0.304 of Primary =0.00 cfs 0.000 of Outflow =0.18 cfs 0.304 of Link 1 L: Total Runoff Inflow =1.75 cfs 0.168 of Primary =1.75 cfs 0.168 of Link 2L: Total Runoff to Existing Pond Inflow =0.00 cfs 0.000 of Primary =0.00 cfs 0.000 of Total Runoff Area = 1.300 ac Runoff Volume = 0.475 of Average Runoff Depth = 4.38" 50.00% Pervious = 0.650 ac 50.00% Impervious = 0.650 ac MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 100 year Rainfall= 5.90" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 @2009 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 1S -E: Existing Grass Play Area Runoff = 1.75 cfs @ 12.24 hrs, Volume= 0.168 af, Depth= 3.10" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Type II 24 -hr 100 year Rainfall = 5.90" Area (ac) CN Description 0.650 74 >75% Grass cover, Good, HSG C 0.650 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 300 0.0150 0.17 Sheet Flow, Existing grass play field Grass: Short n=0.150 P2=2.50" Subcatchment 1S -E: Existing Grass Play Area Hydrograph N 3 0 LL 1.75 cfs Type II 24 -hr 100 year Rainfall= 5.90 Runoff Area =0.650 ac Runoff Volume =0.168 of 1- Runoff Depth= 3.10" Flow Length =300' Slope= 0.0150 '/' Tc =30.0 min CN =74 0 I.-M ... M . . . . . . . . . . . . . . . L . — Runoff 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 100 year Rainfall = 5.90" Prepared by Inspec Printed 12/3/2010 HydroCAD@ 9.00 s/n 06027 © 2009 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 1 S -P: Proposed New 4 East Tennis Courts Runoff = 5.88 cfs @ 11.94 hrs, Volume= 0.307 af, Depth= 5.66" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Type II 24 -hr 100 year Rainfall = 5.90" Area (ac) CN Description 0.650 98 Paved parking, HSG A 0.650 100.00% 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" Subcatchment 1S -P: Proposed New 4 East Tennis Courts Hydrograph 3 0 LL o- Type 1124 -hr 100 year 5- Rainfall =5.90 Runoff Area =0.650 ac 4- Runoff Volume =0.307 of Runoff Depth = 5.66" 3- Flow Length =300' Slope= 0.0150 '/' Tc =3.7 min CN =98 .1 M — Runoff 0 2 4 6 8 1012141618202224262830323436384042444648505254565860626466687072 Time (hours) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 100 year Rainfall= 5.90" Prepared by Inspec Printed 12/3/2010 HydroCADO 9.00 s/n 06027 © 2009 HydroCAD Software Solutions LLC Page 22 Summary for Pond 1 P: Filtration Swale Inflow Area = 0.650 ac,100.00% Impervious, Inflow Depth = 5.66" for 100 year event Inflow = 5.88 cfs @ 11.94 hrs, Volume= 0.307 of Outflow = 0.18 cfs @ 11.98 hrs, Volume= 0.304 af, Atten= 97 %, Lag= 2.3 min Discarded = 0.18 cfs @ 11.98 hrs, Volume= 0.304 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Peak Elev= 1,060.64' @ 13.56 hrs Surf.Area= 0.311 ac Storage= 0.202 of Plug -Flow detention time= 729.8 min calculated for 0.304 of (99% of inflow) Center -of -Mass det. time= 723.7 min ( 1,462.8 - 739.1 ) Volume Invert Avail.Storage Storage Description #1 1,059.00' 0.335 of 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 0.430 0.265 0.335 Device Routina Invert Outlet Devices #1 Primary 1,055.00' 18.0" Round Culvert L= 140.0' RCP, mitered to conform to fill, Ke= 0.700 Outlet Invert= 1,046.00' S= 0.06437' Cc= 0.900 n= 0.010 PVC, smooth interior #2 Device 1 1,060.90' 24.0" Horiz. Orifice /Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 1,059.00' 0.800 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 =0.18 cfs @ 11.98 hrs HW= 1,060.50' (Free Discharge) L3= Exfiltration ( Exfiltration Controls 0.18 cfs) Primary OutFlow Max =0.00 cfs @ 0.00 hrs HW= 1,059.00' (Free Discharge) t--1 =Culvert (Passes 0.00 cfs of 13.53 cfs potential flow) t-2= Orifice /Grate ( Controls 0.00 cfs) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 100 year Rainfall = 5.90" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 02009 HydroCAD Software Solutions LLC Page 23 Pond 1 P: Filtration Swale Hydrograph 6 5.88 cfs — Inflow Area= 0.650'ac Peak Elev= 1,060.' 5 - 64' _ 4 - Storage =0.202 of LL O I I I I I I I I I 3 r I I ' I I I ' 0.18 cfs 0.00 cfs 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 100 year Rainfall = 5.90" Prepared by Inspec Printed 12/3/2010 HydroCAD® 9.00 s/n 06027 @ 2009 HydroCAD Software Solutions LLC Page 24 Summary for Link 1 L: Total Runoff Inflow Area = 0.650 ac, 0.00% Impervious, Inflow Depth = 3.10" for 100 year event Inflow = 1.75 cfs @ 12.24 hrs, Volume= 0.168 of Primary = 1.75 cfs @ 12.24 hrs, Volume= 0.168 af, Atten= 0 %, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Link 1 L: Total Runoff Hydrograph N U O u- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 T, — Inflow — Primary Time (hours) MMW FILT SWALE EAST COURTS 11 -16 -10 Type 1124 -hr 100 year Rainfall = 5.90" Prepared by Inspec Printed 12/3/2010 HydroCAD@ 9.00 s/n 06027 © 2009 HydroCAD Software Solutions LLC Page 25 Summary for Link 2L: Total Runoff to Existing Pond Inflow Area = 0.650 ac,100.00% Impervious, Inflow Depth = 0.00" for 100 year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0 %, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00 -72.00 hrs, dt= 0.01 hrs Link 2L: Total Runoff to Existing Pond 0 N r LL Hydrograph I I I I I I I I I I I I I I I I ! I I I I I I I I I I I I In #low Area =0.650 ac I I I I I I 1 I 1 1 I I I I I I I 1 ! I I I I I I I I I I I ! I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I f I I I I I I I I I I I I I I I I I I I ! I I I I I I I I I I I I I I I I I I I I 1 ! I I I I I I I I I I 1 1 I I ! I I I I I I I I I I I I I 1 I I 1 I 1 I I 1 I I 1 I I I ! I I I 1 I I I 1 I I I I I I I I I I I I I 1 1 ! I I I I 1 I I I I I I 30 cfs L — Inflow — Primary 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)