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Existing Stormwater Calculations
1S Area 1 drainage 2S Area 2 drainage3S Area 3 drainage 4S Existing Area E4 5S Existing Area E5 6S Existing Area E6 1R north ditch one 2R north ditch 2 3R north ditch 3 4R north ditch 4 5R Area to West 6R Area to North 4P North ditch outlet 7P Area E6 Depression Routing Diagram for 14-0105 EXISTING Prepared by Otto Associates, Engineers & Land Surveyors, Inc., Printed 2/13/2014 HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Subcat Reach Pond Link Type II 24-hr 2 yr Rainfall=2.80"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 2HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Area 1 drainage Runoff=1.43 cfs @ 12.22 hrs, Volume=0.148 af, Depth=0.61" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription *0.44099pavement 2.500652 acre lots, 12% imp, HSG B 2.94070Weighted Average 2.20074.83% Pervious Area 0.74025.17% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 25.0 Direct Entry, Summary for Subcatchment 2S: Area 2 drainage Runoff=1.81 cfs @ 12.30 hrs, Volume=0.247 af, Depth=0.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription *0.25099pavement 6.300652 acre lots, 12% imp, HSG B 6.55066Weighted Average 5.54484.64% Pervious Area 1.00615.36% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 30.0 Direct Entry, Summary for Subcatchment 3S: Area 3 drainage Runoff=1.41 cfs @ 12.40 hrs, Volume=0.216 af, Depth=0.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription *0.22099Pavement 5.500652 acre lots, 12% imp, HSG B 5.72066Weighted Average 4.84084.62% Pervious Area 0.88015.38% Impervious Area Type II 24-hr 2 yr Rainfall=2.80"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 3HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 35.0 Direct Entry, Summary for Subcatchment 4S: Existing Area E4 Runoff=6.42 cfs @ 12.30 hrs, Volume=0.682 af, Depth=1.42" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription 2.16083Woods, Poor, HSG D 3.0008450-75% Grass cover, Fair, HSG D 0.60098Paved parking & roofs 5.76085Weighted Average 5.16089.58% Pervious Area 0.60010.42% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 19.53000.02850.26 Sheet Flow, Range n= 0.130 P2= 2.80" 15.23500.00300.38 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 34.7650Total Summary for Subcatchment 5S: Existing Area E5 Runoff=2.80 cfs @ 12.39 hrs, Volume=0.346 af, Depth=1.35" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription 2.15083Woods, Poor, HSG D 0.32098Paved parking & roofs 0.60080>75% Grass cover, Good, HSG D 3.07084Weighted Average 2.75089.58% Pervious Area 0.32010.42% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 20.62150.01700.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 22.1800.01400.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 42.7295Total Type II 24-hr 2 yr Rainfall=2.80"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 4HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: Existing Area E6 Runoff=1.38 cfs @ 12.04 hrs, Volume=0.081 af, Depth=1.16" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (ac)CNDescription 0.74080>75% Grass cover, Good, HSG D 0.05098Paved parking & roofs 0.05083Woods, Poor, HSG D 0.84081Weighted Average 0.79094.05% Pervious Area 0.0505.95% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 12.31200.01910.16 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" Summary for Reach 1R: north ditch one Inflow Area =2.940 ac,25.17% Impervious, Inflow Depth = 0.61" for 2 yr event Inflow=1.43 cfs @ 12.22 hrs, Volume=0.148 af Outflow=1.41 cfs @ 12.29 hrs, Volume=0.148 af, Atten= 1%, Lag= 4.2 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 2.00 fps, Min. Travel Time= 2.4 min Avg. Velocity = 0.77 fps, Avg. Travel Time= 6.3 min Peak Storage= 205 cf @ 12.25 hrs Average Depth at Peak Storage= 0.33' Bank-Full Depth= 4.00' Flow Area= 16.0 sf, Capacity= 101.38 cfs 2.00' x 4.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 6.00' Length= 290.0' Slope= 0.0099 '/' Inlet Invert= 987.22', Outlet Invert= 984.36' Type II 24-hr 2 yr Rainfall=2.80"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 5HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 2R: north ditch 2 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 0.50" for 2 yr event Inflow=3.22 cfs @ 12.30 hrs, Volume=0.395 af Outflow=3.15 cfs @ 12.39 hrs, Volume=0.395 af, Atten= 2%, Lag= 5.3 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 2.64 fps, Min. Travel Time= 3.0 min Avg. Velocity = 1.09 fps, Avg. Travel Time= 7.3 min Peak Storage= 573 cf @ 12.34 hrs Average Depth at Peak Storage= 0.53' Bank-Full Depth= 4.50' Flow Area= 19.1 sf, Capacity= 131.73 cfs 2.00' x 4.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 6.50' Length= 480.0' Slope= 0.0105 '/' Inlet Invert= 983.90', Outlet Invert= 978.88' Summary for Reach 3R: north ditch 3 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 0.50" for 2 yr event Inflow=3.15 cfs @ 12.39 hrs, Volume=0.395 af Outflow=3.15 cfs @ 12.39 hrs, Volume=0.395 af, Atten= 0%, Lag= 0.4 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 4.03 fps, Min. Travel Time= 0.2 min Avg. Velocity = 1.68 fps, Avg. Travel Time= 0.6 min Peak Storage= 47 cf @ 12.39 hrs Average Depth at Peak Storage= 0.36' Bank-Full Depth= 5.00' Flow Area= 22.5 sf, Capacity= 303.44 cfs 2.00' x 5.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 7.00' Length= 60.0' Slope= 0.0363 '/' Inlet Invert= 978.67', Outlet Invert= 976.49' Type II 24-hr 2 yr Rainfall=2.80"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 6HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 4R: north ditch 4 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 0.50" for 2 yr event Inflow=3.15 cfs @ 12.39 hrs, Volume=0.395 af Outflow=3.07 cfs @ 12.50 hrs, Volume=0.395 af, Atten= 3%, Lag= 6.4 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 2.74 fps, Min. Travel Time= 3.5 min Avg. Velocity = 1.11 fps, Avg. Travel Time= 8.7 min Peak Storage= 651 cf @ 12.44 hrs Average Depth at Peak Storage= 0.52' Bank-Full Depth= 4.00' Flow Area= 12.8 sf, Capacity= 79.20 cfs 2.00' x 4.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.3 '/' Top Width= 4.40' Length= 580.0' Slope= 0.0118 '/' Inlet Invert= 977.76', Outlet Invert= 970.94' Summary for Reach 5R: Area to West Inflow Area =20.970 ac,15.38% Impervious, Inflow Depth = 0.43" for 2 yr event Inflow=6.42 cfs @ 12.30 hrs, Volume=0.756 af Outflow=6.42 cfs @ 12.30 hrs, Volume=0.756 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Summary for Reach 6R: Area to North Inflow Area =3.910 ac,9.46% Impervious, Inflow Depth = 1.12" for 2 yr event Inflow=2.80 cfs @ 12.39 hrs, Volume=0.364 af Outflow=2.80 cfs @ 12.39 hrs, Volume=0.364 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Summary for Pond 4P: North ditch outlet Inflow Area =15.210 ac,17.26% Impervious, Inflow Depth = 0.48" for 2 yr event Inflow=4.37 cfs @ 12.48 hrs, Volume=0.611 af Outflow=0.18 cfs @ 24.46 hrs, Volume=0.073 af, Atten= 96%, Lag= 719.0 min Primary=0.18 cfs @ 24.46 hrs, Volume=0.073 af Routing by Stor-Ind method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 2 yr Rainfall=2.80"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 7HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Peak Elev= 968.56' @ 24.46 hrs Surf.Area= 9,840 sf Storage= 25,214 cf Plug-Flow detention time= 1,033.7 min calculated for 0.073 af (12% of inflow) Center-of-Mass det. time= 838.2 min ( 1,773.6 - 935.4 ) VolumeInvertAvail.StorageStorage Description #1966.00'63,780 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 966.009,84000 968.389,84023,41923,419 969.009,8406,10129,520 970.009,8409,84039,360 971.0012,00010,92050,280 972.0015,00013,50063,780 DeviceRouting InvertOutlet Devices #1Primary968.38'18.0" Round Culvert L= 60.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 968.38' / 967.78' S= 0.0100 '/' Cc= 0.900 n= 0.013 Concrete pipe, straight & clean, Flow Area= 1.77 sf Primary OutFlow Max=0.17 cfs @ 24.46 hrs HW=968.56' (Free Discharge) 1=Culvert (Barrel Controls 0.17 cfs @ 2.17 fps) Summary for Pond 7P: Area E6 Depression Inflow Area =0.840 ac,5.95% Impervious, Inflow Depth = 1.16" for 2 yr event Inflow=1.38 cfs @ 12.04 hrs, Volume=0.081 af Outflow=0.04 cfs @ 16.97 hrs, Volume=0.018 af, Atten= 97%, Lag= 295.3 min Primary=0.04 cfs @ 16.97 hrs, Volume=0.018 af Routing by Stor-Ind method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Peak Elev= 978.20' @ 16.97 hrs Surf.Area= 9,785 sf Storage= 2,802 cf Plug-Flow detention time= 481.7 min calculated for 0.018 af (22% of inflow) Center-of-Mass det. time= 341.0 min ( 1,190.0 - 848.9 ) VolumeInvertAvail.StorageStorage Description #1977.53'3,883 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 977.53000 978.005,3751,2631,263 978.209,6851,5062,769 978.3012,6001,1143,883 DeviceRouting InvertOutlet Devices #1Primary978.20'48.0' long x 10.0' breadth Broad-Crested Rectangular Weir Type II 24-hr 2 yr Rainfall=2.80"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 8HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=0.02 cfs @ 16.97 hrs HW=978.20' (Free Discharge) 1=Broad-Crested Rectangular Weir (Weir Controls 0.02 cfs @ 0.15 fps) Type II 24-hr 10 yr Rainfall=4.20"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 9HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Area 1 drainage Runoff=4.00 cfs @ 12.20 hrs, Volume=0.359 af, Depth=1.46" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription *0.44099pavement 2.500652 acre lots, 12% imp, HSG B 2.94070Weighted Average 2.20074.83% Pervious Area 0.74025.17% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 25.0 Direct Entry, Summary for Subcatchment 2S: Area 2 drainage Runoff=6.19 cfs @ 12.27 hrs, Volume=0.659 af, Depth=1.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription *0.25099pavement 6.300652 acre lots, 12% imp, HSG B 6.55066Weighted Average 5.54484.64% Pervious Area 1.00615.36% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 30.0 Direct Entry, Summary for Subcatchment 3S: Area 3 drainage Runoff=4.86 cfs @ 12.33 hrs, Volume=0.576 af, Depth=1.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription *0.22099Pavement 5.500652 acre lots, 12% imp, HSG B 5.72066Weighted Average 4.84084.62% Pervious Area 0.88015.38% Impervious Area Type II 24-hr 10 yr Rainfall=4.20"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 10HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 35.0 Direct Entry, Summary for Subcatchment 4S: Existing Area E4 Runoff=12.00 cfs @ 12.30 hrs, Volume=1.266 af, Depth=2.64" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription 2.16083Woods, Poor, HSG D 3.0008450-75% Grass cover, Fair, HSG D 0.60098Paved parking & roofs 5.76085Weighted Average 5.16089.58% Pervious Area 0.60010.42% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 19.53000.02850.26 Sheet Flow, Range n= 0.130 P2= 2.80" 15.23500.00300.38 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 34.7650Total Summary for Subcatchment 5S: Existing Area E5 Runoff=5.36 cfs @ 12.39 hrs, Volume=0.652 af, Depth=2.55" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription 2.15083Woods, Poor, HSG D 0.32098Paved parking & roofs 0.60080>75% Grass cover, Good, HSG D 3.07084Weighted Average 2.75089.58% Pervious Area 0.32010.42% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 20.62150.01700.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 22.1800.01400.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 42.7295Total Type II 24-hr 10 yr Rainfall=4.20"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 11HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: Existing Area E6 Runoff=2.73 cfs @ 12.04 hrs, Volume=0.160 af, Depth=2.29" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (ac)CNDescription 0.74080>75% Grass cover, Good, HSG D 0.05098Paved parking & roofs 0.05083Woods, Poor, HSG D 0.84081Weighted Average 0.79094.05% Pervious Area 0.0505.95% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 12.31200.01910.16 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" Summary for Reach 1R: north ditch one Inflow Area =2.940 ac,25.17% Impervious, Inflow Depth = 1.46" for 10 yr event Inflow=4.00 cfs @ 12.20 hrs, Volume=0.359 af Outflow=3.97 cfs @ 12.25 hrs, Volume=0.359 af, Atten= 1%, Lag= 3.1 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 2.77 fps, Min. Travel Time= 1.7 min Avg. Velocity = 0.97 fps, Avg. Travel Time= 5.0 min Peak Storage= 415 cf @ 12.22 hrs Average Depth at Peak Storage= 0.62' Bank-Full Depth= 4.00' Flow Area= 16.0 sf, Capacity= 101.38 cfs 2.00' x 4.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 6.00' Length= 290.0' Slope= 0.0099 '/' Inlet Invert= 987.22', Outlet Invert= 984.36' Type II 24-hr 10 yr Rainfall=4.20"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 12HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 2R: north ditch 2 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 1.29" for 10 yr event Inflow=10.13 cfs @ 12.26 hrs, Volume=1.018 af Outflow=10.04 cfs @ 12.33 hrs, Volume=1.018 af, Atten= 1%, Lag= 3.9 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 3.68 fps, Min. Travel Time= 2.2 min Avg. Velocity = 1.38 fps, Avg. Travel Time= 5.8 min Peak Storage= 1,309 cf @ 12.29 hrs Average Depth at Peak Storage= 1.07' Bank-Full Depth= 4.50' Flow Area= 19.1 sf, Capacity= 131.73 cfs 2.00' x 4.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 6.50' Length= 480.0' Slope= 0.0105 '/' Inlet Invert= 983.90', Outlet Invert= 978.88' Summary for Reach 3R: north ditch 3 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 1.29" for 10 yr event Inflow=10.04 cfs @ 12.33 hrs, Volume=1.018 af Outflow=10.03 cfs @ 12.33 hrs, Volume=1.018 af, Atten= 0%, Lag= 0.3 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 5.77 fps, Min. Travel Time= 0.2 min Avg. Velocity = 2.14 fps, Avg. Travel Time= 0.5 min Peak Storage= 104 cf @ 12.33 hrs Average Depth at Peak Storage= 0.73' Bank-Full Depth= 5.00' Flow Area= 22.5 sf, Capacity= 303.44 cfs 2.00' x 5.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 7.00' Length= 60.0' Slope= 0.0363 '/' Inlet Invert= 978.67', Outlet Invert= 976.49' Type II 24-hr 10 yr Rainfall=4.20"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 13HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 4R: north ditch 4 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 1.29" for 10 yr event Inflow=10.03 cfs @ 12.33 hrs, Volume=1.018 af Outflow=9.89 cfs @ 12.41 hrs, Volume=1.018 af, Atten= 1%, Lag= 4.5 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 3.82 fps, Min. Travel Time= 2.5 min Avg. Velocity = 1.40 fps, Avg. Travel Time= 6.9 min Peak Storage= 1,502 cf @ 12.36 hrs Average Depth at Peak Storage= 1.11' Bank-Full Depth= 4.00' Flow Area= 12.8 sf, Capacity= 79.20 cfs 2.00' x 4.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.3 '/' Top Width= 4.40' Length= 580.0' Slope= 0.0118 '/' Inlet Invert= 977.76', Outlet Invert= 970.94' Summary for Reach 5R: Area to West Inflow Area =20.970 ac,15.38% Impervious, Inflow Depth = 1.33" for 10 yr event Inflow=12.00 cfs @ 12.30 hrs, Volume=2.322 af Outflow=12.00 cfs @ 12.30 hrs, Volume=2.322 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Summary for Reach 6R: Area to North Inflow Area =3.910 ac,9.46% Impervious, Inflow Depth = 2.30" for 10 yr event Inflow=6.03 cfs @ 12.38 hrs, Volume=0.749 af Outflow=6.03 cfs @ 12.38 hrs, Volume=0.749 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Summary for Pond 4P: North ditch outlet Inflow Area =15.210 ac,17.26% Impervious, Inflow Depth = 1.26" for 10 yr event Inflow=14.60 cfs @ 12.39 hrs, Volume=1.593 af Outflow=2.86 cfs @ 13.30 hrs, Volume=1.056 af, Atten= 80%, Lag= 54.6 min Primary=2.86 cfs @ 13.30 hrs, Volume=1.056 af Routing by Stor-Ind method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr Rainfall=4.20"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 14HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Peak Elev= 969.16' @ 13.30 hrs Surf.Area= 9,840 sf Storage= 31,123 cf Plug-Flow detention time= 292.2 min calculated for 1.056 af (66% of inflow) Center-of-Mass det. time= 168.8 min ( 1,065.1 - 896.4 ) VolumeInvertAvail.StorageStorage Description #1966.00'63,780 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 966.009,84000 968.389,84023,41923,419 969.009,8406,10129,520 970.009,8409,84039,360 971.0012,00010,92050,280 972.0015,00013,50063,780 DeviceRouting InvertOutlet Devices #1Primary968.38'18.0" Round Culvert L= 60.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 968.38' / 967.78' S= 0.0100 '/' Cc= 0.900 n= 0.013 Concrete pipe, straight & clean, Flow Area= 1.77 sf Primary OutFlow Max=2.86 cfs @ 13.30 hrs HW=969.16' (Free Discharge) 1=Culvert (Barrel Controls 2.86 cfs @ 4.46 fps) Summary for Pond 7P: Area E6 Depression Inflow Area =0.840 ac,5.95% Impervious, Inflow Depth = 2.29" for 10 yr event Inflow=2.73 cfs @ 12.04 hrs, Volume=0.160 af Outflow=0.93 cfs @ 12.23 hrs, Volume=0.097 af, Atten= 66%, Lag= 11.6 min Primary=0.93 cfs @ 12.23 hrs, Volume=0.097 af Routing by Stor-Ind method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Peak Elev= 978.24' @ 12.23 hrs Surf.Area= 10,832 sf Storage= 3,173 cf Plug-Flow detention time= 206.9 min calculated for 0.097 af (60% of inflow) Center-of-Mass det. time= 94.0 min ( 923.3 - 829.4 ) VolumeInvertAvail.StorageStorage Description #1977.53'3,883 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 977.53000 978.005,3751,2631,263 978.209,6851,5062,769 978.3012,6001,1143,883 DeviceRouting InvertOutlet Devices #1Primary978.20'48.0' long x 10.0' breadth Broad-Crested Rectangular Weir Type II 24-hr 10 yr Rainfall=4.20"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 15HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=0.93 cfs @ 12.23 hrs HW=978.24' (Free Discharge) 1=Broad-Crested Rectangular Weir (Weir Controls 0.93 cfs @ 0.49 fps) Type II 24-hr 100 yr Rainfall=5.90"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 16HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Area 1 drainage Runoff=7.74 cfs @ 12.19 hrs, Volume=0.668 af, Depth=2.73" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=5.90" Area (ac)CNDescription *0.44099pavement 2.500652 acre lots, 12% imp, HSG B 2.94070Weighted Average 2.20074.83% Pervious Area 0.74025.17% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 25.0 Direct Entry, Summary for Subcatchment 2S: Area 2 drainage Runoff=13.03 cfs @ 12.24 hrs, Volume=1.292 af, Depth=2.37" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=5.90" Area (ac)CNDescription *0.25099pavement 6.300652 acre lots, 12% imp, HSG B 6.55066Weighted Average 5.54484.64% Pervious Area 1.00615.36% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 30.0 Direct Entry, Summary for Subcatchment 3S: Area 3 drainage Runoff=10.27 cfs @ 12.33 hrs, Volume=1.128 af, Depth=2.37" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=5.90" Area (ac)CNDescription *0.22099Pavement 5.500652 acre lots, 12% imp, HSG B 5.72066Weighted Average 4.84084.62% Pervious Area 0.88015.38% Impervious Area Type II 24-hr 100 yr Rainfall=5.90"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 17HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 35.0 Direct Entry, Summary for Subcatchment 4S: Existing Area E4 Runoff=18.99 cfs @ 12.30 hrs, Volume=2.020 af, Depth=4.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=5.90" Area (ac)CNDescription 2.16083Woods, Poor, HSG D 3.0008450-75% Grass cover, Fair, HSG D 0.60098Paved parking & roofs 5.76085Weighted Average 5.16089.58% Pervious Area 0.60010.42% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 19.53000.02850.26 Sheet Flow, Range n= 0.130 P2= 2.80" 15.23500.00300.38 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 34.7650Total Summary for Subcatchment 5S: Existing Area E5 Runoff=8.60 cfs @ 12.38 hrs, Volume=1.050 af, Depth=4.10" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=5.90" Area (ac)CNDescription 2.15083Woods, Poor, HSG D 0.32098Paved parking & roofs 0.60080>75% Grass cover, Good, HSG D 3.07084Weighted Average 2.75089.58% Pervious Area 0.32010.42% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 20.62150.01700.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" 22.1800.01400.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 42.7295Total Type II 24-hr 100 yr Rainfall=5.90"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 18HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: Existing Area E6 Runoff=4.47 cfs @ 12.04 hrs, Volume=0.265 af, Depth=3.79" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=5.90" Area (ac)CNDescription 0.74080>75% Grass cover, Good, HSG D 0.05098Paved parking & roofs 0.05083Woods, Poor, HSG D 0.84081Weighted Average 0.79094.05% Pervious Area 0.0505.95% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 12.31200.01910.16 Sheet Flow, Grass: Short n= 0.150 P2= 2.80" Summary for Reach 1R: north ditch one Inflow Area =2.940 ac,25.17% Impervious, Inflow Depth = 2.73" for 100 yr event Inflow=7.74 cfs @ 12.19 hrs, Volume=0.668 af Outflow=7.69 cfs @ 12.23 hrs, Volume=0.668 af, Atten= 1%, Lag= 2.4 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 3.35 fps, Min. Travel Time= 1.4 min Avg. Velocity = 1.13 fps, Avg. Travel Time= 4.3 min Peak Storage= 666 cf @ 12.21 hrs Average Depth at Peak Storage= 0.93' Bank-Full Depth= 4.00' Flow Area= 16.0 sf, Capacity= 101.38 cfs 2.00' x 4.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 6.00' Length= 290.0' Slope= 0.0099 '/' Inlet Invert= 987.22', Outlet Invert= 984.36' Type II 24-hr 100 yr Rainfall=5.90"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 19HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 2R: north ditch 2 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 2.48" for 100 yr event Inflow=20.71 cfs @ 12.24 hrs, Volume=1.960 af Outflow=20.54 cfs @ 12.30 hrs, Volume=1.960 af, Atten= 1%, Lag= 3.5 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 4.43 fps, Min. Travel Time= 1.8 min Avg. Velocity = 1.60 fps, Avg. Travel Time= 5.0 min Peak Storage= 2,226 cf @ 12.27 hrs Average Depth at Peak Storage= 1.64' Bank-Full Depth= 4.50' Flow Area= 19.1 sf, Capacity= 131.73 cfs 2.00' x 4.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 6.50' Length= 480.0' Slope= 0.0105 '/' Inlet Invert= 983.90', Outlet Invert= 978.88' Summary for Reach 3R: north ditch 3 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 2.48" for 100 yr event Inflow=20.54 cfs @ 12.30 hrs, Volume=1.960 af Outflow=20.53 cfs @ 12.30 hrs, Volume=1.960 af, Atten= 0%, Lag= 0.2 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 7.03 fps, Min. Travel Time= 0.1 min Avg. Velocity = 2.48 fps, Avg. Travel Time= 0.4 min Peak Storage= 175 cf @ 12.30 hrs Average Depth at Peak Storage= 1.14' Bank-Full Depth= 5.00' Flow Area= 22.5 sf, Capacity= 303.44 cfs 2.00' x 5.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.5 '/' Top Width= 7.00' Length= 60.0' Slope= 0.0363 '/' Inlet Invert= 978.67', Outlet Invert= 976.49' Type II 24-hr 100 yr Rainfall=5.90"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 20HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Summary for Reach 4R: north ditch 4 Inflow Area =9.490 ac,18.40% Impervious, Inflow Depth = 2.48" for 100 yr event Inflow=20.53 cfs @ 12.30 hrs, Volume=1.960 af Outflow=20.32 cfs @ 12.37 hrs, Volume=1.960 af, Atten= 1%, Lag= 3.9 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Max. Velocity= 4.57 fps, Min. Travel Time= 2.1 min Avg. Velocity = 1.62 fps, Avg. Travel Time= 6.0 min Peak Storage= 2,581 cf @ 12.33 hrs Average Depth at Peak Storage= 1.76' Bank-Full Depth= 4.00' Flow Area= 12.8 sf, Capacity= 79.20 cfs 2.00' x 4.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 0.3 '/' Top Width= 4.40' Length= 580.0' Slope= 0.0118 '/' Inlet Invert= 977.76', Outlet Invert= 970.94' Summary for Reach 5R: Area to West Inflow Area =20.970 ac,15.38% Impervious, Inflow Depth = 2.62" for 100 yr event Inflow=23.65 cfs @ 12.48 hrs, Volume=4.570 af Outflow=23.65 cfs @ 12.48 hrs, Volume=4.570 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Summary for Reach 6R: Area to North Inflow Area =3.910 ac,9.46% Impervious, Inflow Depth = 3.84" for 100 yr event Inflow=9.81 cfs @ 12.34 hrs, Volume=1.252 af Outflow=9.81 cfs @ 12.34 hrs, Volume=1.252 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Summary for Pond 4P: North ditch outlet Inflow Area =15.210 ac,17.26% Impervious, Inflow Depth = 2.44" for 100 yr event Inflow=30.40 cfs @ 12.36 hrs, Volume=3.088 af Outflow=11.60 cfs @ 12.81 hrs, Volume=2.550 af, Atten= 62%, Lag= 27.0 min Primary=11.60 cfs @ 12.81 hrs, Volume=2.550 af Routing by Stor-Ind method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr Rainfall=5.90"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 21HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Peak Elev= 970.82' @ 12.81 hrs Surf.Area= 11,606 sf Storage= 48,126 cf Plug-Flow detention time= 166.6 min calculated for 2.550 af (83% of inflow) Center-of-Mass det. time= 88.0 min ( 962.3 - 874.3 ) VolumeInvertAvail.StorageStorage Description #1966.00'63,780 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 966.009,84000 968.389,84023,41923,419 969.009,8406,10129,520 970.009,8409,84039,360 971.0012,00010,92050,280 972.0015,00013,50063,780 DeviceRouting InvertOutlet Devices #1Primary968.38'18.0" Round Culvert L= 60.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 968.38' / 967.78' S= 0.0100 '/' Cc= 0.900 n= 0.013 Concrete pipe, straight & clean, Flow Area= 1.77 sf Primary OutFlow Max=11.60 cfs @ 12.81 hrs HW=970.82' (Free Discharge) 1=Culvert (Barrel Controls 11.60 cfs @ 6.56 fps) Summary for Pond 7P: Area E6 Depression Inflow Area =0.840 ac,5.95% Impervious, Inflow Depth = 3.79" for 100 yr event Inflow=4.47 cfs @ 12.04 hrs, Volume=0.265 af Outflow=3.61 cfs @ 12.11 hrs, Volume=0.202 af, Atten= 19%, Lag= 4.1 min Primary=3.61 cfs @ 12.11 hrs, Volume=0.202 af Routing by Stor-Ind method, Time Span= 2.00-200.00 hrs, dt= 0.01 hrs Peak Elev= 978.30' @ 12.11 hrs Surf.Area= 12,513 sf Storage= 3,846 cf Plug-Flow detention time= 143.8 min calculated for 0.202 af (76% of inflow) Center-of-Mass det. time= 53.7 min ( 868.7 - 815.0 ) VolumeInvertAvail.StorageStorage Description #1977.53'3,883 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaInc.StoreCum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet) 977.53000 978.005,3751,2631,263 978.209,6851,5062,769 978.3012,6001,1143,883 DeviceRouting InvertOutlet Devices #1Primary978.20'48.0' long x 10.0' breadth Broad-Crested Rectangular Weir Type II 24-hr 100 yr Rainfall=5.90"14-0105 EXISTING Printed 2/13/2014Prepared by Otto Associates, Engineers & Land Surveyors, Inc. Page 22HydroCAD® 10.00 s/n 03113 © 2012 HydroCAD Software Solutions LLC Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=3.61 cfs @ 12.11 hrs HW=978.30' (Free Discharge) 1=Broad-Crested Rectangular Weir (Weir Controls 3.61 cfs @ 0.78 fps)