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Drainage Calcuations 10-15-09 .. Existing Conditions ~Ubc;V IReachl ~ ~ Proposed Conditions CITY OF CHANHASSEN RECEIVED OCT 1 6 2009 CHANHASSEN PLANNING DEPT Drainage Diagram for Drainage Calculations Prepared by Pierce Pini & Associates, Printed 10/15/2009 HydroCAOO 8.50 sIn 003481 @ 2007 HydroCAD Software Solutions LLC , . Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@ 8.50 sIn 003481 @ 2007 HydroCAD Software Solutions LLC Printed 10/15/2009 Paae 2 Area Listing (selected nodes) Area (acres) 1.080 3.999 5.079 CN Description (subcatchment-numbers) 74 (1S,2S) 98 (1S,2S) TOTAL AREA Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@ 8.50 sin 003481 @ 2007 HydroCAD Software Solutions LLC Area (acres) 0.000 0.000 0.000 0.000 5.079 5.079 Soil Goup HSGA HSGB HSGC HSGD Other Printed 10/15/2009 Pace 3 Soil Listing (selected nodes) Subcatchment Numbers 1S,2S TOTAL AREA Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@ 8.50 sin 003481 @ 2007 HydroCAD Software Solutions LLC Type 1/24-hr 2-Year Event RainfaJ/=2.70" Printed 1 0/15/2009 Pace 4 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+ Trans method - Pond routing by Stor-Ind method 5ubcatchment 15: Existing Conditions Runoff Area=11 0,626 sf 72.48% Impervious Runoff Depth> 1.79" Flow Length=210' Slope=0.0240 'j' Tc=2.2 min CN=91 Runoff=8.97 cfs 0.379 af 5ubcatchment 25: Proposed Conditions Runoff Area=11 0,626 sf 85.00% Impervious Runoff Depth>2.06" Flow Length=210' Slope=0.0240 'I' Tc=2.2 min CN=94 Runoff=9.91 cfs 0.436 at Total Runoff Area = 5.079 ac Runoff Volume = 0.815 at Average Runoff Depth = 1.93" 21.26% Pervious = 1.080 ac 78.74% Impervious = 3.999 ac Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@ 8.50 sin 003481 @ 2007 HydroCAD Software Solutions LLC Type 1/24-hr 2- Year Event Rainfal/=2.70" Printed 1 0/15/2009 Paae 5 Summary for Subcatchment 1 S: Existing Conditions Runoff 8.97 cfs @ 11.93 hrs, Volume= 0.379 af, Depth> 1.79" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Event Rainfall=2.70" * Area (sf) 80,180 30,446 110,626 30,446 80,180 CN Description 98 74 91 Weighted Average Pervious Area Impervious Area * Tc Length Slope Velocity Capacity Description (min) (feet) (fUft) (fUsee) (cfs) 2.2 210 0.0240 1.58 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.70" : Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@8.50 sIn 003481 @2007 HydroCAD Software Solutions LLC Type /I 24-hr 2- Year Event Rainfal/=2.70" Printed 1 0/15/2009 Pace 6 Summary for Subcatchment 2S: Proposed Conditions Runoff 9.91 cfs @ 11.93 hrs, Volume= 0.436 af, Depth> 2.06" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Event Rainfall=2.70" Area (sf) CN Description * 94,030 98 * 16,596 74 110,626 94 Weighted Average 16,596 Pervious Area 94,030 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 2.2 210 0.0240 1.58 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.70" Drainage Calculations Prepared by Pierce Pini & Associates HydroCAOO 8.50 sin 003481 @ 2007 HydroCAD Software Solutions LLC Type 1/24-hr 10-Year Event Rainfal/=4.15" Printed 1 0/15/2009 Pace 7 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+ Trans method - Pond routing by Stor-Ind method Subeatehment 1 S: Existing Conditions Runoff Area=11 0,626 sf 72.48% Impervious Runoff Depth>3.16" Flow Length=210' Slope=0.0240 'f' Tc=2.2 min CN=91 Runoff=15.22 cfs 0.669 at Subeatehment 2S: Proposed Conditions Runoff Area=110,626 sf 85.00% Impervious Runoff Depth>3.47" Flow Length=210' Slope=0.0240'1' Tc=2.2 min CN=94 Runoff=16.08 cts 0.734 at Total Runoff Area = 5.079 ae Runoff Volume = 1.403 at Average Runoff Depth = 3.32" 21.26% Pervious = 1.080 ae 78.74% Impervious = 3.999 ae .. Drainage Calculations Prepared by Pierce Pini & Associates HvdroCAD@8.50 sin 003481 @ 2007 HvdroCAD Software Solutions LLC Type 1/24-hr to-Year Event RainfaJ/=4.t5" Printed 1 0/15/2009 Pace 8 Summary for Subcatchment 1 S: Existing Conditions Runoff 15.22 cfs @ 11.93 hrs, Volume= 0.669 af, Depth> 3.16" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10- Year Event Rainfall=4.15" Area (sf) CN Description * 80,180 98 * 30,446 74 110,626 91 Weighted Average 30,446 Pervious Area 80,180 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.2 210 0.0240 1.58 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.70" Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@8.50 sin 003481 @2007 HydroCAD Software Solutions LLC Type II 24-hr 10- Year Event Rainfal/=4. 15" Printed 10/15/2009 Pace 9 Summary for Subcatchment 2S: Proposed Conditions Runoff 16.08 cfs @ 11.93 hrs, Volume= 0.734 af, Depth> 3.47" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10- Year Event Rainfall=4.15" * Area (sf) 94,030 16,596 110,626 16,596 94,030 CN Description 98 74 94 Weighted Average Pervious Area Impervious Area * Tc Length Slope Velocity Capacity Description (min) (feet) (fUft) (fUsee) (cfs) 2.2 210 0.0240 1.58 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.70" Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@8.50 sin 003481 @2007 HydroCAD Software Solutions LLC Type /I 24-hr 100- Year Event Rainfal/=6.00" Printed 1 0/15/2009 Pace 1 0 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+ Trans method - Pond routing by Stor-Ind method 5ubcatchment 15: Existing Conditions Runoff Area=11 0,626 sf 72.48% Impervious Runoff Depth>4.96" Flow Length=210' Slope=0.0240'1' Tc=2.2 min CN=91 Runoff=23.09 cfs 1.049 af 5ubcatchment 25: Proposed Conditions Runoff Area=110,626 sf 85.00% Impervious Runoff Depth>5.29" Flow Length=21 0' Slope=0.0240 'I' Tc=2.2 min CN=94 Runoff=23.81 cfs 1.121 af Total Runoff Area = 5.079 ac Runoff Volume = 2.169 at Average Runoff Depth = 5.13" 21.26% Pervious = 1.080 ac 78.74% Impervious = 3.999 ac " Drainage Calculations Prepared by Pierce Pini & Associates HydroCAD@ 8.50 sin 003481 @ 2007 HydroCAD Software Solutions LLC Type" 24-hr tOO-Year Event RainfaJ/=6.00" Printed 1 0/15/2009 Paae 11 Summary for Subcatchment 1 S: Existing Conditions Runoff = 23.09 cfs @ 11.93 hrs, Volume= 1.049 af, Depth> 4.96" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Event Rainfall=6.00" * Area (sf) 80,180 30,446 110,626 30,446 80,180 CN Description 98 74 91 Weighted Average Pervious Area Impervious Area * Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.2 210 0.0240 1.58 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.70" Drainage Calculations Prepared by Pierce Pini & Associates HvdroCAD@8.50 sin 003481 @2007 HvdroCAD Software Solutions LLC Type 1/24-hr tOO-Year Event Rainfal/=6.00" Printed 1 0/15/2009 Paae 12 Summary for Subcatchment 2S: Proposed Conditions Runoff 23.81 cfs @ 11.92 hrs, Volume= 1.121 af, Depth> 5.29" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Event Rainfall=6.00" * Area (sf) 94,030 16,596 110,626 16,596 94,030 CN Description 98 74 94 Weighted Average Pervious Area Impervious Area * Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 2.2 210 0.0240 1.58 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.70" - ~. 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