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Hydrology Report 07-01-2013CHANHASSEN SENIOR HOUSING FINAL HYDROLOGY REPORT 6 -29 -2013 PREPARED BY STEVE BROYER, P.E. I hereby certify this plan, specification or report was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the state of Minnesota . LIC #47080 CHANHASSEN SENIOR HOUSING SITE DRAINAGE MAP & HYDROLOGY SUMMARY 893.62 893.18 RCP 20"908.14 CMP12"óó ó24 UNIT - ASSISTED LIVING 13,700 sf FFE=913.0 LOT 1 BLOCK 1 8.57 AC OUTDOOR SPACE 5,100 SF 14 14 STALLS 894.00 894.57 895.44 894.87 899.98 900.85 908.00 907.20 917.67 917.67 914.67 914.50 912.24 913.26 911.50 909.28 910.22 912.20 912.20 912.13 912.13 912.13 911.34 911.02 912.13 900 910 910 896 898 902 904 906 908 912 912 914 914 916 916 910 902 904 906 908 912 914 916 916 900 910 894 896 898 902 904 906 908 910 902 904 906 908 912 914 916 900 902 904 906 6.73%4.16%4.30%7.08%-4.22%-7.04%-5.13%-1.33%-4.01%FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM 900 894 896 898 902 902 902 904 904 904 906 906 906 908 16.5' WETLAND BUFFER 40' WETLAND SETBACK -27.38%-30.52%-16.98%-28.90%-32.58%-29.15%-24.46%-22.35%-25.78%-22.63%-25.48%-29.13%-24.70%-12.33%-30.31%-33.59%-30.16%-15.56%-22.27%-9.93%-11.89%-16.71%-22.46%-14.18%Project Number:REVISION LOG:Date:Reg. No:47080 2011-05 CHANHASSEN, MINNESOTA CHANHASSEN SENIOR HOUSING I hereby certify this plan, specification or report was prepared by me or under my direct supervision and that I am a duly Professional Engineer under the laws of the state of 9109 w 23rd st SLP, MN 55426 (612) 770-4645 5/13/13 - SITE SURVEY REVISIONS 3/19/13 - 24 UNIT FOOTPRINT SHIFT/CITY SUBMITTAL 2/11/13 - DRAFT CITY SUBMITTAL ‹3/4/13 - 24 UNIT REVISION 6/13/13 - GRADING REVISIONS/SETBACK ADDITIONS 6/29/13 - HYDROLOGY REVISIONS LEGEND PROPOSED EXISTING HYDROLOGY INFORMATION STORMWATER CALCULATIONS &C3.1 STORMWATER INFORMATION THE DEVELOPMENTS SITE IMPACT FOOTPRINT WAS USED TO DERIVE EXISTING CONDITION DISCHARGE RATES IN THE HYDROLOGY CALCULATIONS.THE MAJORITY OF THE IMPACTED SITE DRAINS TO THE WEST TO THE EXISTING SUBDIVISION POND. THE HYDROLOGY CALCULATIONS ILLUSTRATE THE SITES DISCHARGE RATES FORM THE DEVELOPMENT ARE SIMILAR TO EXISTING CONDITIONS, INCREASES IN DISCHARGE RATES SHALL NOT ADVERSELY EFFECT DOWNSTREAM DRAINAGE.THE POND WILL BE CONSTRUCTED PER THE REQUIREMENTS SET FOURTH IN SECTION 19-144-ARCICLE VII OF THE CHANHASSEN SURFACE WATER MANAGEMENT CODE OF ORDINANCES CONTRACTOR TO PROVIDE SHOP DRAWINGS TO ENGINEER PER THE OUTLET DEVICE REQUIREMENTS ON THIS DOCUMENT POND INFORMATION SCALE IN FEET 0 40 20 80 POND OUTLET: CONTROL STRUCTURE ORIFICE(S)STORM SEWER CHANHASSEN SENIOR HOUSING EXISTING CONDITIONS HYDROLOGY CALCULATIONS 1.5AC EX Site Routing Diagram for 2012-12-31 Existing Hydrology Prepared by BCE Consultants, Printed 7/2/2013 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2012-12-31 Existing Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 2 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1.5AC: EX Site Runoff =0.09 cfs @ 36.02 hrs, Volume=0.027 af, Depth=0.21"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"Area (ac)CN Description 1.500 58Woods/grass comb., Good, HSG B 1.500 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)15.0 Direct Entry,Subcatchment 1.5AC: EX Site Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"Runoff Area=1.500 ac Runoff Volume=0.027 af Runoff Depth=0.21"Tc=15.0 min CN=58 0.09 cfs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2012-12-31 Existing Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 3 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1.5AC: EX Site Runoff =0.63 cfs @ 35.93 hrs, Volume=0.095 af, Depth=0.76"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"Area (ac)CN Description 1.500 58Woods/grass comb., Good, HSG B 1.500 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)15.0 Direct Entry,Subcatchment 1.5AC: EX Site Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )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 72.00 hrs 10 year Rainfall=4.20"Runoff Area=1.500 ac Runoff Volume=0.095 af Runoff Depth=0.76"Tc=15.0 min CN=58 0.63 cfs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2012-12-31 Existing Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 4 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1.5AC: EX Site Runoff =1.61 cfs @ 35.91 hrs, Volume=0.220 af, Depth=1.76"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"Area (ac)CN Description 1.500 58Woods/grass comb., Good, HSG B 1.500 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)15.0 Direct Entry,Subcatchment 1.5AC: EX Site Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )1 0 Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"Runoff Area=1.500 ac Runoff Volume=0.220 af Runoff Depth=1.76"Tc=15.0 min CN=58 1.61 cfs Spillway 1-day 10-day 600.00 hrs Snowmelt Rainfall=7.20", AMC=4 2012-12-31 Existing Hydrolog Printed 7/2/2013 Prepared by BCE Consultants Page 5 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1.5AC: EX Site Runoff =0.29 cfs @ 303.25 hrs, Volume=0.793 af, Depth>6.35"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Spillway 1-day 10-day 600.00 hrs Snowmelt Rainfall=7.20", AMC=4 Area (ac)CN AdjDescription 1.500 58 Woods/grass comb., Good, HSG B 1.500 58 98Weighted Average, AMC Adjusted 1.500 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)15.0 Direct Entry,Subcatchment 1.5AC: EX Site Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.32 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 Spillway 1-day 10-day 600.00 hrs Snowmelt Rainfall=7.20"AMC=4 Runoff Area=1.500 ac Runoff Volume=0.793 af Runoff Depth>6.35"Tc=15.0 min AMC Adjusted CN=98 0.29 cfs CHANHASSEN SENIOR HOUSING PROPOSED HYDROLOGY CALCULATIONS 0.57 AC CSH Pervious 0.69 AC CSH Impervious ENT RD Entrance Road 2P INFILTRATION BASIN POND NW POND Routing Diagram for 2013-06-29 Proposed Hydrology Prepared by BCE Consultants, Printed 7/2/2013 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 2 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.57 AC: CSH Pervious Runoff =0.09 cfs @ 35.86 hrs, Volume=0.015 af, Depth=0.29"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"Area (ac)CN Description 0.610 61>75% Grass cover, Good, HSG B 0.610 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)7.0 Direct Entry,Subcatchment 0.57 AC: CSH Pervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"Runoff Area=0.610 ac Runoff Volume=0.015 af Runoff Depth=0.29"Tc=7.0 min CN=61 0.09 cfs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 3 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.69 AC: CSH Impervious Runoff =1.04 cfs @ 35.76 hrs, Volume=0.148 af, Depth=2.57"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"Area (ac)CN Description *0.106100Pond *0.317 98Senior Housing *0.268 98Parking Lot 0.691 98Weighted Average 0.691 100.00% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment 0.69 AC: CSH Impervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )1 0 Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"Runoff Area=0.691 ac Runoff Volume=0.148 af Runoff Depth=2.57"Tc=5.0 min CN=98 1.04 cfs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 4 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment ENT RD: Entrance Road Runoff =0.33 cfs @ 35.78 hrs, Volume=0.042 af, Depth=0.57"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"Area (ac)CN Description *0.190 98Access Drive 0.340 61>75% Grass cover, Good, HSG B *0.360 61>75% Grass cover, Good, HSG B 0.890 69Weighted Average 0.700 78.65% Pervious Area 0.190 21.35% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment ENT RD: Entrance Road Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.36 0.34 0.32 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 72.00 hrs 2 year Rainfall=2.80"Runoff Area=0.890 ac Runoff Volume=0.042 af Runoff Depth=0.57"Tc=5.0 min CN=69 0.33 cfs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 5 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond 2P: INFILTRATION BASIN Inflow Area =0.890 ac,21.35% Impervious, Inflow Depth = 0.57" for 2 year event Inflow =0.33 cfs @ 35.78 hrs, Volume=0.042 af Outflow =0.01 cfs @ 49.62 hrs, Volume=0.042 af, Atten= 98%, Lag= 830.4 min Discarded=0.01 cfs @ 49.62 hrs, Volume=0.042 af Primary=0.00 cfs @ 1.00 hrs, Volume=0.000 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 904.38' @ 49.62 hrs Surf.Area= 968 sf Storage= 951 cf Flood Elev= 905.00' Surf.Area= 1,237 sf Storage= 1,632 cf Plug-Flow detention time= 1,476.4 min calculated for 0.042 af (100% of inflow)Center-of-Mass det. time= 1,476.5 min ( 4,129.0 - 2,652.5 )Volume Invert Avail.StorageStorage Description #1 903.00'1,632 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)903.00 424 0 0 904.00 801 613 613 905.00 1,237 1,019 1,632 DeviceRouting InvertOutlet Devices #1 Discarded 903.00'0.370 in/hr Exfiltration over Surface area #2 Primary 904.80'6.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Discarded OutFlow Max=0.01 cfs @ 49.62 hrs HW=904.38' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.01 cfs)Primary OutFlow Max=0.00 cfs @ 1.00 hrs HW=903.00' (Free Discharge)2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 6 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond 2P: INFILTRATION BASIN Inflow Outflow Discarded Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.36 0.34 0.32 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=0.890 ac Peak Elev=904.38'Storage=951 cf 0.33 cfs 0.01 cfs 0.01 cfs 0.00 cfs Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 7 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond POND: NW POND Inflow Area =1.301 ac,53.11% Impervious, Inflow Depth = 1.50" for 2 year event Inflow =1.11 cfs @ 35.76 hrs, Volume=0.163 af Outflow =0.08 cfs @ 37.30 hrs, Volume=0.163 af, Atten= 93%, Lag= 92.2 min Primary=0.08 cfs @ 37.30 hrs, Volume=0.163 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 905.70' @ 37.30 hrs Surf.Area= 5,232 sf Storage= 3,469 cf Flood Elev= 907.20' Surf.Area= 6,587 sf Storage= 11,108 cf Plug-Flow detention time= 732.6 min calculated for 0.163 af (100% of inflow)Center-of-Mass det. time= 732.2 min ( 3,035.6 - 2,303.4 )Volume Invert Avail.StorageStorage Description #1 905.00'11,108 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)905.00 4,719 0 0 906.00 5,455 5,087 5,087 907.00 6,587 6,021 11,108 DeviceRouting InvertOutlet Devices #1 Primary 905.00'12.0" Round Culvert L= 112.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 905.00' / 900.00' S= 0.0446 '/' Cc= 0.900 n= 0.120, Flow Area= 0.79 sf #2 Device 1 905.00'2.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 905.70'6.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 906.20'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)Primary OutFlow Max=0.08 cfs @ 37.30 hrs HW=905.70' (Free Discharge)1=Culvert (Passes 0.08 cfs of 0.44 cfs potential flow)2=Orifice/Grate (Orifice Controls 0.08 cfs @ 3.77 fps)3=Orifice/Grate ( Controls 0.00 cfs)4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 72.00 hrs 2 year Rainfall=2.80"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 8 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond POND: NW POND Inflow Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )1 0 Inflow Area=1.301 ac Peak Elev=905.70'Storage=3,469 cf 1.11 cfs 0.08 cfs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 9 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.57 AC: CSH Pervious Runoff =0.37 cfs @ 35.81 hrs, Volume=0.047 af, Depth=0.92"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"Area (ac)CN Description 0.610 61>75% Grass cover, Good, HSG B 0.610 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)7.0 Direct Entry,Subcatchment 0.57 AC: CSH Pervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.4 0.38 0.36 0.34 0.32 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 72.00 hrs 10 year Rainfall=4.20"Runoff Area=0.610 ac Runoff Volume=0.047 af Runoff Depth=0.92"Tc=7.0 min CN=61 0.37 cfs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 10 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.69 AC: CSH Impervious Runoff =1.57 cfs @ 35.76 hrs, Volume=0.228 af, Depth=3.96"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"Area (ac)CN Description *0.106100Pond *0.317 98Senior Housing *0.268 98Parking Lot 0.691 98Weighted Average 0.691 100.00% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment 0.69 AC: CSH Impervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )1 0 Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"Runoff Area=0.691 ac Runoff Volume=0.228 af Runoff Depth=3.96"Tc=5.0 min CN=98 1.57 cfs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 11 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment ENT RD: Entrance Road Runoff =0.88 cfs @ 35.77 hrs, Volume=0.104 af, Depth=1.40"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"Area (ac)CN Description *0.190 98Access Drive 0.340 61>75% Grass cover, Good, HSG B *0.360 61>75% Grass cover, Good, HSG B 0.890 69Weighted Average 0.700 78.65% Pervious Area 0.190 21.35% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment ENT RD: Entrance Road Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.95 0.9 0.85 0.8 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 72.00 hrs 10 year Rainfall=4.20"Runoff Area=0.890 ac Runoff Volume=0.104 af Runoff Depth=1.40"Tc=5.0 min CN=69 0.88 cfs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 12 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond 2P: INFILTRATION BASIN Inflow Area =0.890 ac,21.35% Impervious, Inflow Depth = 1.40" for 10 year event Inflow =0.88 cfs @ 35.77 hrs, Volume=0.104 af Outflow =0.49 cfs @ 35.96 hrs, Volume=0.104 af, Atten= 44%, Lag= 11.2 min Discarded=0.01 cfs @ 35.96 hrs, Volume=0.062 af Primary=0.48 cfs @ 35.96 hrs, Volume=0.041 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 904.89' @ 35.96 hrs Surf.Area= 1,190 sf Storage= 1,501 cf Flood Elev= 905.00' Surf.Area= 1,237 sf Storage= 1,632 cf Plug-Flow detention time= 1,132.2 min calculated for 0.104 af (100% of inflow)Center-of-Mass det. time= 1,132.2 min ( 3,691.4 - 2,559.2 )Volume Invert Avail.StorageStorage Description #1 903.00'1,632 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)903.00 424 0 0 904.00 801 613 613 905.00 1,237 1,019 1,632 DeviceRouting InvertOutlet Devices #1 Discarded 903.00'0.370 in/hr Exfiltration over Surface area #2 Primary 904.80'6.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Discarded OutFlow Max=0.01 cfs @ 35.96 hrs HW=904.89' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.01 cfs)Primary OutFlow Max=0.47 cfs @ 35.96 hrs HW=904.89' (Free Discharge)2=Broad-Crested Rectangular Weir (Weir Controls 0.47 cfs @ 0.85 fps) Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 13 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond 2P: INFILTRATION BASIN Inflow Outflow Discarded Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.890 ac Peak Elev=904.89'Storage=1,501 cf 0.88 cfs 0.49 cfs 0.01 cfs 0.48 cfs Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 14 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond POND: NW POND Inflow Area =1.301 ac,53.11% Impervious, Inflow Depth = 2.54" for 10 year event Inflow =1.92 cfs @ 35.76 hrs, Volume=0.275 af Outflow =0.37 cfs @ 36.08 hrs, Volume=0.275 af, Atten= 81%, Lag= 18.9 min Primary=0.37 cfs @ 36.08 hrs, Volume=0.275 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 906.03' @ 36.08 hrs Surf.Area= 5,486 sf Storage= 5,235 cf Flood Elev= 907.20' Surf.Area= 6,587 sf Storage= 11,108 cf Plug-Flow detention time= 595.0 min calculated for 0.275 af (100% of inflow)Center-of-Mass det. time= 595.2 min ( 2,893.8 - 2,298.6 )Volume Invert Avail.StorageStorage Description #1 905.00'11,108 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)905.00 4,719 0 0 906.00 5,455 5,087 5,087 907.00 6,587 6,021 11,108 DeviceRouting InvertOutlet Devices #1 Primary 905.00'12.0" Round Culvert L= 112.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 905.00' / 900.00' S= 0.0446 '/' Cc= 0.900 n= 0.120, Flow Area= 0.79 sf #2 Device 1 905.00'2.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 905.70'6.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 906.20'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)Primary OutFlow Max=0.37 cfs @ 36.08 hrs HW=906.03' (Free Discharge)1=Culvert (Passes 0.37 cfs of 0.78 cfs potential flow)2=Orifice/Grate (Orifice Controls 0.10 cfs @ 4.68 fps)3=Orifice/Grate (Orifice Controls 0.27 cfs @ 1.95 fps)4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 72.00 hrs 10 year Rainfall=4.20"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 15 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond POND: NW POND Inflow Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )2 1 0 Inflow Area=1.301 ac Peak Elev=906.03'Storage=5,235 cf 1.92 cfs 0.37 cfs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 16 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.57 AC: CSH Pervious Runoff =0.84 cfs @ 35.80 hrs, Volume=0.102 af, Depth=2.01"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"Area (ac)CN Description 0.610 61>75% Grass cover, Good, HSG B 0.610 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)7.0 Direct Entry,Subcatchment 0.57 AC: CSH Pervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.9 0.85 0.8 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 72.00 hrs 100 year Rainfall=6.00"Runoff Area=0.610 ac Runoff Volume=0.102 af Runoff Depth=2.01"Tc=7.0 min CN=61 0.84 cfs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 17 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.69 AC: CSH Impervious Runoff =2.26 cfs @ 35.76 hrs, Volume=0.332 af, Depth=5.76"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"Area (ac)CN Description *0.106100Pond *0.317 98Senior Housing *0.268 98Parking Lot 0.691 98Weighted Average 0.691 100.00% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment 0.69 AC: CSH Impervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )2 1 0 Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"Runoff Area=0.691 ac Runoff Volume=0.332 af Runoff Depth=5.76"Tc=5.0 min CN=98 2.26 cfs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 18 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment ENT RD: Entrance Road Runoff =1.70 cfs @ 35.77 hrs, Volume=0.201 af, Depth=2.71"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"Area (ac)CN Description *0.190 98Access Drive 0.340 61>75% Grass cover, Good, HSG B *0.360 61>75% Grass cover, Good, HSG B 0.890 69Weighted Average 0.700 78.65% Pervious Area 0.190 21.35% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment ENT RD: Entrance Road Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )1 0 Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"Runoff Area=0.890 ac Runoff Volume=0.201 af Runoff Depth=2.71"Tc=5.0 min CN=69 1.70 cfs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 19 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond 2P: INFILTRATION BASIN [93] Warning: Storage range exceeded by 0.02'[58] Hint: Peaked 0.02' above defined flood level [88] Warning: Qout>Qin may require Finer Routing>1 Inflow Area =0.890 ac,21.35% Impervious, Inflow Depth = 2.71" for 100 year event Inflow =1.70 cfs @ 35.77 hrs, Volume=0.201 af Outflow =1.70 cfs @ 35.76 hrs, Volume=0.201 af, Atten= 0%, Lag= 0.0 min Discarded=0.01 cfs @ 35.73 hrs, Volume=0.064 af Primary=1.69 cfs @ 35.76 hrs, Volume=0.137 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 905.02' @ 35.76 hrs Surf.Area= 1,237 sf Storage= 1,632 cf Flood Elev= 905.00' Surf.Area= 1,237 sf Storage= 1,632 cf Plug-Flow detention time= 595.2 min calculated for 0.201 af (100% of inflow)Center-of-Mass det. time= 595.3 min ( 3,095.2 - 2,499.9 )Volume Invert Avail.StorageStorage Description #1 903.00'1,632 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)903.00 424 0 0 904.00 801 613 613 905.00 1,237 1,019 1,632 DeviceRouting InvertOutlet Devices #1 Discarded 903.00'0.370 in/hr Exfiltration over Surface area #2 Primary 904.80'6.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Discarded OutFlow Max=0.01 cfs @ 35.73 hrs HW=905.01' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.01 cfs)Primary OutFlow Max=1.69 cfs @ 35.76 hrs HW=905.02' (Free Discharge)2=Broad-Crested Rectangular Weir (Weir Controls 1.69 cfs @ 1.30 fps) Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 20 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond 2P: INFILTRATION BASIN Inflow Outflow Discarded Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )1 0 Inflow Area=0.890 ac Peak Elev=905.02'Storage=1,632 cf 1.70 cfs 1.70 cfs 0.01 cfs 1.69 cfs Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 21 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond POND: NW POND Inflow Area =1.301 ac,53.11% Impervious, Inflow Depth = 4.00" for 100 year event Inflow =3.07 cfs @ 35.77 hrs, Volume=0.434 af Outflow =0.90 cfs @ 36.65 hrs, Volume=0.434 af, Atten= 71%, Lag= 52.8 min Primary=0.90 cfs @ 36.65 hrs, Volume=0.434 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 906.45' @ 36.04 hrs Surf.Area= 5,961 sf Storage= 7,637 cf Flood Elev= 907.20' Surf.Area= 6,587 sf Storage= 11,108 cf Plug-Flow detention time= 476.9 min calculated for 0.434 af (100% of inflow)Center-of-Mass det. time= 476.8 min ( 2,769.8 - 2,293.0 )Volume Invert Avail.StorageStorage Description #1 905.00'11,108 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)905.00 4,719 0 0 906.00 5,455 5,087 5,087 907.00 6,587 6,021 11,108 DeviceRouting InvertOutlet Devices #1 Primary 905.00'12.0" Round Culvert L= 112.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 905.00' / 900.00' S= 0.0446 '/' Cc= 0.900 n= 0.120, Flow Area= 0.79 sf #2 Device 1 905.00'2.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 905.70'6.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 906.20'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)Primary OutFlow Max=0.90 cfs @ 36.65 hrs HW=906.28' (Free Discharge)1=Culvert (Barrel Controls 0.90 cfs @ 1.16 fps)2=Orifice/Grate (Passes < 0.11 cfs potential flow)3=Orifice/Grate (Passes < 0.54 cfs potential flow)4=Sharp-Crested Rectangular Weir (Passes < 0.29 cfs potential flow) Type II 24-hr 72.00 hrs 100 year Rainfall=6.00"2013-06-29 Proposed Hydrology Printed 7/2/2013 Prepared by BCE Consultants Page 22 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond POND: NW POND Inflow Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )3 2 1 0 Inflow Area=1.301 ac Peak Elev=906.45'Storage=7,637 cf 3.07 cfs 0.90 cfs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 2013-06-29 Proposed Hydrol Printed 7/2/2013 Prepared by BCE Consultants Page 23 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.57 AC: CSH Pervious Runoff =0.15 cfs @ 242.52 hrs, Volume=0.354 af, Depth=6.96"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 Area (ac)CN AdjDescription 0.610 61 >75% Grass cover, Good, HSG B 0.610 61 98Weighted Average, AMC Adjusted 0.610 100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)7.0 Direct Entry,Subcatchment 0.57 AC: CSH Pervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )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 Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20"AMC=4 Runoff Area=0.610 ac Runoff Volume=0.354 af Runoff Depth=6.96"Tc=7.0 min AMC Adjusted CN=98 0.15 cfs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 2013-06-29 Proposed Hydrol Printed 7/2/2013 Prepared by BCE Consultants Page 24 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 0.69 AC: CSH Impervious Runoff =0.17 cfs @ 242.50 hrs, Volume=0.401 af, Depth=6.96"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 Area (ac)CN Description *0.106100Pond *0.317 98Senior Housing *0.268 98Parking Lot 0.691 98Weighted Average 0.691 100.00% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment 0.69 AC: CSH Impervious Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )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 Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20"AMC=4 Runoff Area=0.691 ac Runoff Volume=0.401 af Runoff Depth=6.96"Tc=5.0 min CN=98 0.17 cfs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 2013-06-29 Proposed Hydrol Printed 7/2/2013 Prepared by BCE Consultants Page 25 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment ENT RD: Entrance Road Runoff =0.21 cfs @ 242.50 hrs, Volume=0.516 af, Depth=6.96"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 Area (ac)CN AdjDescription *0.190 98 Access Drive 0.340 61 >75% Grass cover, Good, HSG B *0.360 61 >75% Grass cover, Good, HSG B 0.890 69 98Weighted Average, AMC Adjusted 0.700 78.65% Pervious Area 0.190 21.35% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs)5.0 Direct Entry,Subcatchment ENT RD: Entrance Road Runoff Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.24 0.23 0.22 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 Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20"AMC=4 Runoff Area=0.890 ac Runoff Volume=0.516 af Runoff Depth=6.96"Tc=5.0 min AMC Adjusted CN=98 0.21 cfs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 2013-06-29 Proposed Hydrol Printed 7/2/2013 Prepared by BCE Consultants Page 26 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond 2P: INFILTRATION BASIN Inflow Area =0.890 ac,21.35% Impervious, Inflow Depth = 6.96" for Snowmelt event Inflow =0.21 cfs @ 242.50 hrs, Volume=0.516 af Outflow =0.21 cfs @ 242.55 hrs, Volume=0.506 af, Atten= 0%, Lag= 3.2 min Discarded=0.01 cfs @ 242.55 hrs, Volume=0.300 af Primary=0.20 cfs @ 242.55 hrs, Volume=0.207 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 904.85' @ 242.55 hrs Surf.Area= 1,173 sf Storage= 1,454 cf Flood Elev= 905.00' Surf.Area= 1,237 sf Storage= 1,632 cf Plug-Flow detention time= 1,099.7 min calculated for 0.506 af (98% of inflow)Center-of-Mass det. time= 848.2 min ( 15,661.6 - 14,813.4 )Volume Invert Avail.StorageStorage Description #1 903.00'1,632 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)903.00 424 0 0 904.00 801 613 613 905.00 1,237 1,019 1,632 DeviceRouting InvertOutlet Devices #1 Discarded 903.00'0.370 in/hr Exfiltration over Surface area #2 Primary 904.80'6.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Discarded OutFlow Max=0.01 cfs @ 242.55 hrs HW=904.85' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.01 cfs)Primary OutFlow Max=0.20 cfs @ 242.55 hrs HW=904.85' (Free Discharge)2=Broad-Crested Rectangular Weir (Weir Controls 0.20 cfs @ 0.64 fps) Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 2013-06-29 Proposed Hydrol Printed 7/2/2013 Prepared by BCE Consultants Page 27 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond 2P: INFILTRATION BASIN Inflow Outflow Discarded Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )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=0.890 ac Peak Elev=904.85'Storage=1,454 cf 0.21 cfs 0.21 cfs 0.01 cfs 0.20 cfs Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 2013-06-29 Proposed Hydrol Printed 7/2/2013 Prepared by BCE Consultants Page 28 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Summary for Pond POND: NW POND Inflow Area =1.301 ac,53.11% Impervious, Inflow Depth = 6.96" for Snowmelt event Inflow =0.31 cfs @ 242.52 hrs, Volume=0.755 af Outflow =0.21 cfs @ 244.98 hrs, Volume=0.748 af, Atten= 34%, Lag= 148.0 min Primary=0.21 cfs @ 244.98 hrs, Volume=0.748 af Routing by Stor-Ind method, Time Span= 1.00-480.00 hrs, dt= 0.01 hrs Peak Elev= 905.90' @ 244.98 hrs Surf.Area= 5,381 sf Storage= 4,542 cf Flood Elev= 907.20' Surf.Area= 6,587 sf Storage= 11,108 cf Plug-Flow detention time= 622.6 min calculated for 0.748 af (99% of inflow)Center-of-Mass det. time= 500.7 min ( 15,315.0 - 14,814.3 )Volume Invert Avail.StorageStorage Description #1 905.00'11,108 cf Custom Stage Data (Prismatic) Listed below (Recalc)Elevation Surf.Area Inc.Store Cum.Store (feet)(sq-ft)(cubic-feet)(cubic-feet)905.00 4,719 0 0 906.00 5,455 5,087 5,087 907.00 6,587 6,021 11,108 DeviceRouting InvertOutlet Devices #1 Primary 905.00'12.0" Round Culvert L= 112.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 905.00' / 900.00' S= 0.0446 '/' Cc= 0.900 n= 0.120, Flow Area= 0.79 sf #2 Device 1 905.00'2.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 905.70'6.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 906.20'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)Primary OutFlow Max=0.21 cfs @ 244.98 hrs HW=905.90' (Free Discharge)1=Culvert (Passes 0.21 cfs of 0.66 cfs potential flow)2=Orifice/Grate (Orifice Controls 0.09 cfs @ 4.35 fps)3=Orifice/Grate (Orifice Controls 0.11 cfs @ 1.52 fps)4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Spillway 1-day 10-day 480.00 hrs Snowmelt Rainfall=7.20", AMC=4 2013-06-29 Proposed Hydrol Printed 7/2/2013 Prepared by BCE Consultants Page 29 HydroCAD® 10.00 s/n 08014 © 2013 HydroCAD Software Solutions LLC Pond POND: NW POND Inflow Primary Hydrograph Time (hours)480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 F l o w (c f s )0.34 0.32 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=1.301 ac Peak Elev=905.90'Storage=4,542 cf 0.31 cfs 0.21 cfs CHANHASSEN SENIOR HOUSING NURP POND CALCULATIONS PROJECT :Chanhassen Senior Housing DATE:29-Jun PROJECT # :BY:SJB NURP POND CALCULATION - ENTIRE SITE Rational Method Q = CIA 0.15 Acre Feet Total Drainage Area (A)=1.28 Acres Rainfall Event(I)=2.5 Inches C=0.55 ELEVATION AREA AREA VOLUME ACCUM. STOR LIVE STORAGE FT SF AC AC-FT AC-FT AC-FT 900.00 50 0.001 0.000 0.014 902.00 677 0.016 0.014 0.064 904.00 2256 0.052 0.078 0.078 NWL 905.00 4719 0.108 0.156 0.117 906.00 5455 0.125 0.273 0.138 907.00 6587 0.151 0.411 Permanent Pool Required = 0.15 ac-ft Permanent Pool Provided = 0.16 ac-ft POND - SIZE Pond Storage Calculations Surface Pond Area = 0.11 acres Mean Pond Depth = 1.44 feet Page 1