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HomeMy WebLinkAboutWPO201400024 Study 2017-04-12 , pre-south Prepared by{enter your company name here} Type II 24-hr 2 yr Rainfall1/2014 H droCAD® 10.00 s/n 08123 ©2013 H droCAD Software Solutions LLC Printed 5/1/2014 Pase 1 Summary for Subcatchment 1S: (new Subcat) Runoff = 8.60 cfs @ 12.21 hrs, Volume= 0.712 af, Depth> 1.07" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2 yr Rainfall=3.70" Area ac CN Descri.tion 2.120 74 >75% Grass cover, Good, HSG C 5.890 70 Woods Good HSG C 8.010 71 Weighted Average 8.010 ✓ 100.00% Pervious Area Tc Length Slope Velocity Capacity Description min feet ft/ft ft/sec 19.1. 200 0.0890 cfs 0.17 Sheet Flow, Overland 1 117 0.0890 Woods: Light underbrush n= 0.400 P2= 3.70" 1.49 Shallow Concentrated Flow, Shallow Conc 5 0 250 0.0500 Woodland Kv= 5.0 fps 0.83 0.08 Channel Flow, Channel Area=0.1 sf Perim= 0.1' r= 1.00' n= 0.400 Sheet flow: Woods+li•ht brush 25.4 567 Total Subcatchment 1S: (new Subcat) Hydrograph 9 aso cfsFa El Runoff Type 1124-hr 8 2 yr_Rainfall=3,70., 9-- Runoff Area=8.010 ac 5 Runoff;Volume=0 712 af 3Pa LL Runoff Depth>1:07" 4 kl s Flow Length=567'_ 3 - TG d -25y4 min 2 CN=71 12 13 14 15 16 Time (hours) 17 18 19 20 pre-south Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 1S: (new Subcat) Runoff = 19.65 cfs @ 12.20 hrs, Volume= 1.568 af, Depth> 2.35" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 yr Rainfall=5.60" Area (ac) CN Description 2.120 74 >75% Grass cover, Good, HSG C 5.890 70 Woods, Good, HSG C 8.010 71 Weighted Average 8.010 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.1 200 0.0890 0.17 Sheet Flow, Overland Woods: Light underbrush n= 0.400 P2= 3.70" 1.3 117 0.0890 1.49 Shallow Concentrated Flow, Shallow Conc Woodland Kv= 5.0 fps 5.0 250 0.0500 0.83 0.08 Channel Flow, Channel Area= 0.1 sf Perim= 0.1' r= 1.00' n= 0.400 Sheet flow: Woods+light brush 25.4 567 Total Subcatchment 1S: (new Subcat) Hydrograph 22 0 Runoff 20 ®.. Type 1124 hr181 / el 16 10 yr Rainfall=5.60" 2 . 15 Runoff..Area=8.010 ac 14; _ -Runoff-Volume=1.568 af - ,51 Runoff Depth>2.35" _. LL 10 Flow Length=567' Tc-254 min ... CN=71 5 _ -40 6 ty4 . . flC .�.� 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) pre-south Type 1124-hr 100 yr Rainfall=9.10" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 1S: (new Subcat) Runoff = 42.69 cfs @ 12.19 hrs, Volume= 3.418 af, Depth> 5.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 yr Rainfall=9.10" Area (ac) CN Description 2.120 74 >75% Grass cover, Good, HSG C 5.890 70 Woods, Good, HSG C 8.010 71 Weighted Average 8.010 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.1 200 0.0890 0.17 Sheet Flow, Overland Woods: Light underbrush n= 0.400 P2= 3.70" 1.3 117 0.0890 1.49 Shallow Concentrated Flow, Shallow Conc Woodland Kv= 5.0 fps 5.0 250 0.0500 0.83 0.08 Channel Flow, Channel Area= 0.1 sf Perim= 0.1' r= 1.00' n= 0.400 Sheet flow: Woods+light brush 25.4 567 Total Subcatchment 1S: (new Subcat) Hydrograph 46110=dif 44 ..... _...... ..._. ........ .. - .. ._142:69 cfs I 42 _. Type II 24hr...... 40-1- 38f 0=36 100 yr Rainfall=9.10'x.. _.. 34Runoff...Area=8.010 ac._.. 30;32 . 4,4 Runoff Volume 3:418;af 28 , Runoff Depth>5.12" 0 22 Flow Length=567' 18 s __. Tc=25.4 min 16 CN=71 04. 10 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) BAPpost-south — Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 1 Pipe Listing (selected nodes) Line# Node In-Invert Out-Invert Length Slope n Diam/Width Height Inside-Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 2P 553.00 552.81 18.0 0.0106 0.015 24.0 0.0 0.0 post-south Type 1124-hr 2 yr Rainfall=3.70" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 2 Summary for Pond 2P: (new Pond) Inflow Area = 8.720 ac,'32.49% Impervious, Inflow Depth > 1.64" for 2 yr event Inflow = 18.29 cfs @ 12.11 hrs, Volume= 1.195 af Outflow = 10.52 cfs @ 12.28 hrs, Volume= 1.059 af, Atten=42%, Lag= 10.0 min Primary = 10.52 cfs @ 12.28 hrs, Volume= 1.059 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 557.08' @ 12.28 hrs Surf.Area= 0.108 ac Storage= 0.352 af Plug-Flow detention time=61.8 min calculated for 1.059 af(89% of inflow) Center-of-Mass det. time= 25.1 min (824.0-798.8) Volume Invert Avail.Storage Storage Description #1A 552.00' 0.278 af 27.00'W x 175.00'L x 11.00'H Field A 1.193 af Overall - 0.497 af Embedded = 0.696 af x 40.0%Voids #2A 553.00' 0.497 af CMP_Round 108 x 16 Inside#1 Effective Size= 108.0"W x 108.0"H => 63.50 sf x 20.00'L = 1,270.0 cf Overall Size= 108.0"W x 108.0"H x 20.00'L 21.00' Header x 63.50 sf x 1 = 1,333.5 cf Inside 0.776 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 553.00' 24.0" Round Culvert L= 18.0' CPP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 553.00' /552.81' S= 0.01061/ Cc= 0.900 n= 0.015 Corrugated PE, smooth interior, Flow Area= 3.14 sf #2 Device 1 554.24' 16.0"W x 13.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 557.32' 1.1"W x 2.6" H Vert. 10 yr C= 0.600 #4 Device 1 559.95' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.00 Width (feet) 7.55 7.27 6.96 6.62 6.22 5.78 5.26 4.66 3.92 2.96 1.34 0.00 Primary OutFlow Max=10.49 cfs @ 12.28 hrs HW=557.07' (Free Discharge) t-1=Culvert (Passes 10.49 cfs of 26.49 cfs potential flow) -2=Orifice/Grate (Orifice Controls 10.49 cfs @ 7.26 fps) -3=10 yr ( Controls 0.00 cfs) -4=Custom Weir/Orifice ( Controls 0.00 cfs) post- south Type 11 24-hr 2 yr Rainfall=3.70" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 3 Pond 2P: (new Pond) - Chamber Wizard Field A Chamber Model =CMP_Round 108 Effective Size= 108.0"W x 108.0"H => 63.50 sf x 20.00'L= 1,270.0 cf Overall Size= 108.0"W x 108.0"H x 20.00'L 108.0"Wide + 36.0" Spacing = 144.0" C-C Row Spacing 8 Chambers/Row x 20.00' Long +9.00' Header x 1 = 169.00' Row Length +36.0" End Stone x 2 = 175.00' Base Length 2 Rows x 108.0"Wide + 36.0" Spacing x 1 + 36.0" Side Stone x 2 = 27.00' Base Width 12.0" Base+ 108.0" Chamber Height+ 12.0" Cover= 11.00' Field Height 16 Chambers x 1,270.0 cf+ 21.00' Header x 63.50 sf= 21,653.5 cf Chamber Storage 51,975.0 cf Field-21,653.5 cf Chambers = 30,321.5 cf Stone x 40.0%Voids = 12,128.6 cf Stone Storage Chamber Storage+ Stone Storage= 33,782.1 cf= 0.776 of Overall Storage Efficiency= 65.0% 16 Chambers 1,925.0 cy Field 1,123.0 cy Stone • Fl 4 �.q I post-south Type 1124-hr 2 yprrin tRained fa5I/I7/32. 07104 e2 " Prepared by{enter your company013 name HydroCAD here} HydroCAD® 10.00 s/n 08123Software Solutions LLC Page 4 Pond 2P: (new Pond) Hydrograph InflowM / r ' ' 1 1829cfs 1 0 Primary A -8 720 ac 204" - inflow. rea- . - ' - : ' ' , ' Peak Elev--557.-08° Ste/rage-0'352 af 18-E' • [ ' " ..... — "" 124.-.-- • 11 110 52cts ‘ 7 = • ' , ,%,' "a .:, •" to 10; ,', 1 • 8i, e";' '' LI- •-.: /' ' , ,' ' ',K,• , 7-',',' 6i 5 3-.;,' , , ,,, ,,•, ., --'1,4,,,,-gozs.elopw.-/;,:›der.cltr.m.44t1Y/4.4r-,4 6 7 15 16 17 18 19 20 5 8 9 1011 12 1314 Time (hours) post-south Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 5 Summary for Pond 2P: (new Pond) • Inflow Area = 8.720 ac, 32.49% Impervious, Inflow Depth > 3.17" for 10 yr event Inflow = 34.83 cfs @ 12.10 hrs, Volume= 2.301 af Outflow = 24.16 cfs @ 12.25 hrs, Volume= 2.159 af, Atten= 31%, Lag= 8.6 min Primary = 24.16 cfs @ 12.25 hrs, Volume= 2.159 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 560.41' @ 12.25 hrs Surf.Area= 0.108 ac Storage= 0.628 af Plug-Flow detention time=46.0 min calculated for 2.152 af(94% of inflow) Center-of-Mass det. time=24.3 min (809.0- 784.7) Volume Invert Avail.Storage Storage Description #1A 552.00' 0.278 af 27.00'W x 175.00'L x 11.00'H Field A 1.193 af Overall - 0.497 af Embedded = 0.696 af x 40.0%Voids #2A 553.00' 0.497 af CMP Round 108 x 16 Inside#1 Effective Size= 108.0"W x 108.0"H => 63.50 sf x 20.00'L = 1,270.0 cf Overall Size= 108.0"W x 108.0"H x 20.00'L 21.00' Header x 63.50 sf x 1 = 1,333.5 cf Inside 0.776 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 553.00' 24.0" Round Culvert L= 18.0' CPP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 553.00' /552.81' S= 0.0106 '/' Cc= 0.900 n= 0.015 Corrugated PE, smooth interior, Flow Area= 3.14 sf #2 Device 1 554.24' 16.0"W x 13.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 557.32' 1.1"W x 2.6" H Vert. 10 yr C= 0.600 #4 Device 1 559.95' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.00 Width (feet) 7.55 7.27 6.96 6.62 6.22 5.78 5.26 4.66 3.92 2.96 1.34 0.00 Primaryifs OutFlow Max=23.92 @ 12.25 hrs HW=560.40' (Free Discharge) ri 1=Culvert (Passes 23.92 cfs of 38.28 cfs potential flow) -2=Orifice/Grate (Orifice Controls 16.48 cfs @ 11.41 fps) -3=10 yr (Orifice Controls 0.16 cfs @ 8.30 fps) -4=Custom Weir/Orifice (Weir Controls 7.27 cfs @ 2.22 fps) post- south Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 6 Pond 2P: (new Pond) - Chamber Wizard Field A Chamber Model =CMP_Round 108 Effective Size= 108.0"W x 108.0"H => 63.50 sf x 20.00'L= 1,270.0 cf Overall Size= 108.0"W x 108.0"H x 20.00'L 108.0"Wide+36.0" Spacing = 144.0" C-C Row Spacing 8 Chambers/Row x 20.00' Long +9.00' Header x 1 = 169.00' Row Length +36.0" End Stone x 2 = 175.00' Base Length 2 Rows x 108.0"Wide+ 36.0" Spacing x 1 + 36.0" Side Stone x 2 =27.00' Base Width 12.0" Base+ 108.0" Chamber Height+ 12.0" Cover= 11.00' Field Height 16 Chambers x 1,270.0 cf+21.00' Header x 63.50 sf= 21,653.5 cf Chamber Storage 51,975.0 cf Field-21,653.5 cf Chambers = 30,321.5 cf Stone x 40.0% Voids = 12,128.6 cf Stone Storage Chamber Storage + Stone Storage = 33,782.1 cf= 0.776 of Overall Storage Efficiency = 65.0% 16 Chambers 1,925.0 cy Field 1,123.0 cy Stone r ; ktfim 11 rir fi /04 Ft^ 4 � a is r`n� y � yw� post-south Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 7 Pond 2P: (new Pond) Hydrograph ' Inflow 0 Primary I I 38 34 83 cfs 3642 Inflow Area=8.720 ac 3417' Peak Elev=560.41' 32-4 3Cr:- Storage=0 628. af 26 , 24 16 cfs j...7 22 •`-'1 3 - o 181 u. - • 164. ' 141 • 40 6;--• , , ;%. 0:i4aZrZke/7,11*". 3,,,,,P7,026M0S,;:aVo'ffk;fr..;Zar,t 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) post-south Type 1124-hr 100 yr Rainfall=9.10" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 8 Summary for Pond 2P: (new Pond) [93] Warning: Storage range exceeded by 17.57' [88] Warning: Qout>Qin may require Finer Routing>1 Inflow Area = 8.720 ac, 32.49% Impervious, Inflow Depth > 6.22" for 100 yr event Inflow = 66.46 cfs @ 12.10 hrs, Volume= 4.519 af Outflow = 78.01 cfs @ 12.15 hrs, Volume= 4.368 af, Atten= 0%, Lag= 2.8 min Primary = 78.01 cfs @ 12.15 hrs, Volume= 4.368 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 580.57' @ 12.15 hrs Surf.Area= 0.108 ac Storage= 0.776 af Plug-Flow detention time= 33.1 min calculated for 4.354 af(96% of inflow) Center-of-Mass det. time= 19.9 min (789.2 - 769.3) Volume Invert Avail.Storage Storage Description #1A 552.00' 0.278 af 27.00'W x 175.00'L x 11.00'H Field A 1.193 af Overall - 0.497 af Embedded = 0.696 af x 40.0%Voids #2A 553.00' 0.497 af CMP_Round 108 x 16 Inside#1 Effective Size= 108.0"W x 108.0"H => 63.50 sf x 20.00'L = 1,270.0 cf Overall Size= 108.0"W x 108.0"H x 20.00'L 21.00' Header x 63.50 sf x 1 = 1,333.5 cf Inside 0.776 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 553.00' 24.0" Round Culvert L= 18.0' CPP, square edge headwall, Ke= 0.500 Inlet/ Outlet Invert= 553.00'/552.81' S= 0.0106 '/' Cc= 0.900 n= 0.015 Corrugated PE, smooth interior, Flow Area= 3.14 sf #2 Device 1 554.24' 16.0"W x 13.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 557.32' 1.1"W x 2.6" H Vert. 10 yr C= 0.600 #4 Device 1 559.95' Custom Weir/Orifice, Cv=2.62(C= 3.28) Head (feet) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.00 Width (feet) 7.55 7.27 6.96 6.62 6.22 5.78 5.26 4.66 3.92 2.96 1.34 0.00 Primary OutFlow Max=76.76 cfs @ 12.15 hrs HW=579.75' (Free Discharge) Lam=Culvert (Inlet Controls 76.76 cfs @ 24.43 fps) -2=Orifice/Grate (Passes < 34.75 cfs potential flow) -3=10 yr (Passes < 0.45 cfs potential flow) -4=Custom Weir/Orifice (Passes < 231.44 cfs potential flow) post-south Type 1124-hr 100 yr Rainfall=9.10" Prepared by {enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 9 Pond 2P: (new Pond) - Chamber Wizard Field A Chamber Model =CMP_Round 108 Effective Size= 108.0"W x 108.0"H => 63.50 sf x 20.00'L= 1,270.0 cf Overall Size= 108.0"W x 108.0"H x 20.00'L 108.0"Wide + 36.0" Spacing = 144.0" C-C Row Spacing 8 Chambers/Row x 20.00' Long +9.00' Header x 1 = 169.00' Row Length +36.0" End Stone x 2 = 175.00' Base Length 2 Rows x 108.0"Wide+ 36.0" Spacing x 1 + 36.0" Side Stone x 2 = 27.00' Base Width 12.0" Base + 108.0" Chamber Height+ 12.0" Cover= 11.00' Field Height 16 Chambers x 1,270.0 cf+ 21.00' Header x 63.50 sf= 21,653.5 cf Chamber Storage 51,975.0 cf Field - 21,653.5 cf Chambers = 30,321.5 cf Stone x 40.0%Voids = 12,128.6 cf Stone Storage Chamber Storage + Stone Storage= 33,782.1 cf= 0.776 of Overall Storage Efficiency= 65.0% 16 Chambers 1,925.0 cy Field 1,123.0 cy Stone P F„ a3 'f` '3s , , . post-south Type 1124-hr 100 yr Rainfall=9.10" ' Prepared by {enter your company here}name HydroCAD® 10.00 s/n 08123 ©2013 HydroCADPrinted 5/1/2014 Software Solutions LLC Page 10 Pond 2P: (new Pond) Hydrograph ./. Erif{....ij ° Inflow 85-:. ,' I 78 01 efs I Inflow Area=8.720 ac 8751, " • KAP Peak Elev=580.57" = • . 1,,,,,1- ,,, Storage=0.776 at 65-i: • ' ,O; ' . so-!-',• ig,, ' 50. /,•, , i.4.:,,,„, , V-' 45:, 3 : ' • ir. i, 40: u- ''' • • f',;1,,. , 35-1) 30::. 25E'r• 20: V <1;;;',,„, 1°i.' , . . ',, •' -, ,'• ; :':;"- '"'de/ , elte#112::r.'1,4;%We';';‘*;:;,4ip:',/iLeWi,-,,ii7 54' ./., •, '; .- '',, , . ",,r.r,' ,'',.;,,,,,,o.,00,, ,, , ,/ •,e,e,,41(6:4:',...4•.'4,',IA.,,,a,•",/,‘..A. . . , E' t; 0 7 8 6 14 5 1, 1, , , 6 , ' ' • 17 18 19 20 5 9 10 11 12 13 Time (hours) .. '5tArP iti , post- north Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 1 Pipe Listing (selected nodes) Line# Node In-Invert Out-Invert Length Slope n Diam/Width Height Inside-Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 3P 564.00 562.85 120.0 0.0096 0.030 18.0 0.0 0.0 post- north Type 1124-hr 2 yr Rainfall=3.70" Prepared by {enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 2 Summary for Pond 3P: Detention Basin #1 Inflow Area = 2.580 ac, 50.78% Impervious, Inflow Depth > 2.12" for 2 yr event Inflow = 9.87 cfs @ 11.97 hrs, Volume= 0.455 of Outflow = 2.89 cfs @ 12.12 hrs, Volume= 0.378 af, Atten= 71%, Lag= 8.8 min Primary = 2.89 cfs @ 12.12 hrs, Volume= 0.378 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 568.37' @ 12.12 hrs Surf.Area=2,600 sf Storage= 8,927 cf Plug-Flow detention time= 92.6 min calculated for 0.378 af(83% of inflow) Center-of-Mass det. time= 43.4 min (818.3- 774.9) Volume Invert Avail.Storage Storage Description #1A 563.00' 6,404 cf 25.00'W x 104.00'L x 10.00'H Field A 26,000 cf Overall - 9,991 cf Embedded = 16,009 cf x 40.0%Voids #2A 564.00' 9,991 cf CMP_Round 96 x 10 Inside#1 Effective Size= 96.0"W x 96.0"H => 50.20 sf x 20.00'L= 1,004.1 cf Overall Size= 96.0"W x 96.0"H x 20.00'L Row Length Adjustment=-10.00' x 50.20 sf x 2 rows 19.00' Header x 50.20 sf x 1 = 953.9 cf Inside 16,394 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 564.00' 18.0" Round Culvert L= 120.0' Ke= 0.400 Inlet/Outlet Invert= 564.00'/562.85' S= 0.00961/1 Cc= 0.900 n= 0.030 Corrugated metal, Flow Area= 1.77 sf #2 Device 1 565.33' 8.0"W x 6.5" H Vert. 2 yr orifice C= 0.600 #3 Device 1 568.69' 8.0"W x 5.5" H Vert. 10 yr orifice C= 0.600 #4 Device 1 571.20' Custom Weir/Orifice, Cv= 2.62(C=3.28) Head (feet) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 Width (feet) 4.80 4.52 4.21 3.87 3.49 3.04 2.50 1.78 0.00 Primary OutFlow Max=2.88 cfs @ 12.12 hrs HW=568.34' (Free Discharge) =Culvert ulvert (Passes 2.88 cfs of 7.83 cfs potential flow) 2=2 yr orifice (Orifice Controls 2.88 cfs @ 7.97 fps) 3=10 yr orifice ( Controls 0.00 cfs) =Custom Weir/Orifice ( Controls 0.00 cfs) post- north Type 1124-hr 2 yr Rainfall=3.70" Prepared by {enter your company name here) Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 3 Pond 3P: Detention Basin #1 - Chamber Wizard Field A Chamber Model = CMP_Round 96 Effective Size= 96.0"W x 96.0"H => 50.20 sf x 20.00'L = 1,004.1 cf Overall Size= 96.0"W x 96.0"H x 20.00'L Row Length Adjustment=-10.00'x 50.20 sf x 2 rows 96.0" Wide+ 36.0" Spacing = 132.0" C-C Row Spacing 5 Chambers/Row x 20.00' Long -10.00' Row Adjustment +8.00' Header x 1 = 98.00' Row Length +36.0" End Stone x 2 = 104.00' Base Length 2 Rows x 96.0" Wide +36.0" Spacing x 1 + 36.0" Side Stone x 2 = 25.00' Base Width 12.0" Base+ 96.0" Chamber Height+ 12.0" Cover= 10.00' Field Height 10 Chambers x 1,004.1 cf -10.00' Row Adjustment x 50.20 sf x 2 Rows + 19.00' Header x 50.20 sf= 9,990.8 cf Chamber Storage 26,000.0 cf Field - 9,990.8 cf Chambers = 16,009.2 cf Stone x 40.0% Voids = 6,403.7 cf Stone Storage Chamber Storage + Stone Storage= 16,394.5 cf= 0.376 of Overall Storage Efficiency =63.1% 10 Chambers 963.0 cy Field 592.9 cy Stone fc,4 04 3 OA ar7(f /S T STs¢ ALO m � .,2 yJ post- north Type 1124-hr 2 yr Rainfall=.3.70" Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Pape 4 Pond 3P: Detention Basin #1 Hydrograph Inflow 11_ , 1987cfs 0 Primary 10- • ';'/, inflow.Area=2.580 ac Peak Elev--568 37" Storage=8 927 cf 25 _ 3- - ' 6 7 5 8 9 10 11 12' 13 14 15 16 17 18 19 20 Time (hours) , . post- north Type 1124-hr 2 yprrRinateindfaLIP2=/a32g.07:041" Prepared by{enter yourcompanyyname here) HydroCAD® 10.00 s/n 08123o2HydroCAD Software Solutions LLC Summary for Link 6L: (new Link) Inflow Area = 6.216 ac, ..Inflow Deopt.8h3>3 a1f.61" for 2 yr event Inflow = Primary = 88..55 22 cc ff ss @ 33.82%1122..1199 hrs,hrsVImpervious,ol Volume=umeAtten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs af, Link 6L: (new Link) Hydrograph 0 Inflowi,..;,..1,ary i 18 52 ds 1 _ 9 8 52t, inflow Area=6.216 ac , , /4 1 8- 7::: 6--- , ; ;' ,, iii. '' 5-: o u. .4.-- 3 =?<:=,, ' - Ti),A 7 27 0 16 17 18 19 '- seir,4712,1a,41,A 14 15 .Aked,557, 9 10 11 Till:, (hours) 0 8 5 6 7 post- north Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 5 Summary for Pond 3P: Detention Basin #1 Inflow Area = 2.580 ac, 50.78% Impervious, Inflow Depth > 3.77" for 10 yr event Inflow = 17.01 cfs @ 11.97 hrs, Volume= 0.811 af Outflow = 6.72 cfs @ 12.10 hrs, Volume= 0.732 af, Atten= 61%, Lag= 7.8 min Primary = 6.72 cfs @ 12.10 hrs, Volume= 0.732 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 571.28' @ 12.09 hrs Surf.Area=2,600 sf Storage= 14,334 cf Plug-Flow detention time= 75.2 min calculated for 0.730 af(90% of inflow) Center-of-Mass det. time=42.0 min ( 803.5- 761.5) Volume Invert Avail.Storage Storage Description #1A 563.00' 6,404 cf 25.00'W x 104.00'L x 10.00'H Field A 26,000 cf Overall - 9,991 cf Embedded = 16,009 cf x 40.0% Voids #2A 564.00' 9,991 cf CMP_Round 96 x 10 Inside#1 Effective Size= 96.0"W x 96.0"H => 50.20 sf x 20.00'L = 1,004.1 cf Overall Size= 96.0"W x 96.0"H x 20.00'L Row Length Adjustment= -10.00'x 50.20 sf x 2 rows 19.00' Header x 50.20 sf x 1 = 953.9 cf Inside 16,394 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 564.00' 18.0" Round Culvert L= 120.0' Ke= 0.400 Inlet/Outlet Invert= 564.00'/562.85' S= 0.0096 '/' Cc= 0.900 n= 0.030 Corrugated metal, Flow Area= 1.77 sf #2 Device 1 565.33' 8.0"W x 6.5" H Vert. 2 yr orifice C= 0.600 #3 Device 1 568.69' 8.0"W x 5.5" H Vert. 10 yr orifice C= 0.600 #4 Device 1 571.20' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 Width (feet) 4.80 4.52 4.21 3.87 3.49 3.04 2.50 1.78 0.00 Primary OutFlow Max=6.67 cfs @ 12.10 hrs HW=571.27' (Free Discharge) t--.=Culvert (Passes 6.67 cfs of 10.31 cfs potential flow) -2=2 yr orifice (Orifice Controls 4.14 cfs @ 11.46 fps) -3=10 yr orifice (Orifice Controls 2.25 cfs @ 7.38 fps) -4=Custom Weir/Orifice (Weir Controls 0.27 cfs @ 0.86 fps) • post- north Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 6 Pond 3P: Detention Basin #1 - Chamber Wizard Field A Chamber Model =CMP_Round 96 Effective Size= 96.0"W x 96.0"H => 50.20 sf x 20.00'L = 1,004.1 cf Overall Size= 96.0"W x 96.0"H x 20.00'L Row Length Adjustment=-10.00' x 50.20 sf x 2 rows 96.0"Wide + 36.0" Spacing= 132.0" C-C Row Spacing 5 Chambers/Row x 20.00' Long -10.00' Row Adjustment+8.00' Header x 1 = 98.00' Row Length +36.0" End Stone x 2 = 104.00' Base Length 2 Rows x 96.0" Wide+ 36.0" Spacing x 1 + 36.0" Side Stone x 2 =25.00' Base Width 12.0" Base + 96.0" Chamber Height+ 12.0" Cover= 10.00' Field Height 10 Chambers x 1,004.1 cf -10.00' Row Adjustment x 50.20 sf x 2 Rows + 19.00' Header x 50.20 sf= 9,990.8 cf Chamber Storage 26,000.0 cf Field - 9,990.8 cf Chambers = 16,009.2 cf Stone x 40.0% Voids = 6,403.7 cf Stone Storage Chamber Storage + Stone Storage = 16,394.5 cf= 0.376 of Overall Storage Efficiency = 63.1% 10 Chambers 963.0 cy Field 592.9 cy Stone 5 r s W I' 4 n ao r � f AtwnY *f r 4,04 471 ur'Ya rl Tt post- north Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 7 Pond 3P: Detention Basin #1 Hydrograph 19 ' iInflow mams B Primary Inflow Area=2.580 ac 16!-' C Peak Elev=571 .281 Storage=14,334 et 13= ' = 12 °,w14-, tf:. • "' '14/0411. -4111169* WZ:2114:207(09Z421, .efrdSfetilMsZeMPZ2V2ir/WAVIO 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) post- north Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 2 Summary for Link 6L: (new Link) Inflow Area = 6.216 ac, 33.82% Impervious, Inflow Depth3>3a3f.15" for 10 yr event Inflow = 17.28 cfs @ 12.17 hrs, Volume= i Primary = 17.28 cfs @ 12.17 hrs, Volume= 1.6336af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 6L: (new Link) Hydrograph : / E166131211jIc19 z 1Primary Inflow rea 16 ' 6.0e, , A =6.216 acrat 14 ' pi / X ' . 10 9 1 4/49"Ar:°)9"591: 49'7;" ' 6' 7 18 19 20 0 e 7 8 9 16 11 12 13 14 15 1 1 Time (hours) • post- north Type 1124-hr 100 yr Rainfall=9.10" Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 8 Summary for Pond 3P: Detention Basin #1 [82] Warning: Early inflow requires earlier time span [93] Warning: Storage range exceeded by 91.46' [88] Warning: Qout>Qin may require Finer Routing>1 Inflow Area = 2.580 ac, 50.78% Impervious, Inflow Depth > 6.94" for 100 yr event Inflow = 30.08 cfs @ 11.97 hrs, Volume= 1.492 af Outflow = 39.34 cfs @ 12.00 hrs, Volume= 1.410 af, Atten= 0%, Lag= 1.8 min Primary = 39.34 cfs @ 12.00 hrs, Volume= 1.410 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 664.46' @ 12.00 hrs Surf.Area= 2,600 sf Storage= 16,394 cf Plug-Flow detention time= 54.7 min calculated for 1.405 af(94% of inflow) Center-of-Mass det. time= 33.5 min (782.3- 748.8) Volume Invert Avail.Storage Storage Description #1A 563.00' 6,404 cf 25.00'W x 104.00'L x 10.00'H Field A 26,000 cf Overall - 9,991 cf Embedded = 16,009 cf x 40.0%Voids #2A 564.00' 9,991 cf CMP Round 96 x 10 Inside#1 Effective Size= 96.0"W x 96.0"H => 50.20 sf x 20.00'L = 1,004.1 cf Overall Size= 96.0"W x 96.0"H x 20.00'L Row Length Adjustment=-10.00' x 50.20 sf x 2 rows 19.00' Header x 50.20 sf x 1 = 953.9 cf Inside 16,394 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 564.00' 18.0" Round Culvert L= 120.0' Ke= 0.400 Inlet/Outlet Invert= 564.00'/562.85' S= 0.0096 '/' Cc= 0.900 n= 0.030 Corrugated metal, Flow Area= 1.77 sf #2 Device 1 565.33' 8.0"W x 6.5" H Vert. 2 yr orifice C= 0.600 #3 Device 1 568.69' 8.0"W x 5.5" H Vert. 10 yr orifice C= 0.600 #4 Device 1 571.20' Custom Weir/Orifice, Cv=2.62(C= 3.28) Head (feet) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 Width (feet) 4.80 4.52 4.21 3.87 3.49 3.04 2.50 1.78 0.00 Primary OutFlow Max=37.99 cfs @ 12.00 hrs HW=658.27' (Free Discharge) L.=Culvert (Barrel Controls 37.99 cfs @ 21.50 fps) -2=2 yr orifice (Passes < 16.74 cfs potential flow) -3=10 yr orifice (Passes < 13.91 cfs potential flow) --4=Custom Weir/Orifice (Passes < 118.09 cfs potential flow) post- north Type 1124-hr 100 yr Rainfall=9.10" Prepared by{enter your company name here} Printed 5/2/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 9 Pond 3P: Detention Basin #1 - Chamber Wizard Field A Chamber Model = CMP_Round 96 Effective Size= 96.0"W x 96.0"H => 50.20 sf x 20.00'L= 1,004.1 cf Overall Size= 96.0"W x 96.0"H x 20.00'L Row Length Adjustment=-10.00' x 50.20 sf x 2 rows 96.0"Wide + 36.0" Spacing = 132.0" C-C Row Spacing 5 Chambers/Row x 20.00' Long -10.00' Row Adjustment+8.00' Header x 1 = 98.00' Row Length +36.0" End Stone x 2 = 104.00' Base Length 2 Rows x 96.0"Wide + 36.0" Spacing x 1 + 36.0" Side Stone x 2 =25.00' Base Width 12.0" Base + 96.0" Chamber Height+ 12.0" Cover= 10.00' Field Height 10 Chambers x 1,004.1 cf -10.00' Row Adjustment x 50.20 sf x 2 Rows + 19.00' Header x 50.20 sf= 9,990.8 cf Chamber Storage 26,000.0 cf Field - 9,990.8 cf Chambers = 16,009.2 cf Stone x 40.0% Voids = 6,403.7 cf Stone Storage Chamber Storage + Stone Storage = 16,394.5 cf= 0.376 of Overall Storage Efficiency= 63.1% 10 Chambers 963.0 cy Field 592.9 cy Stone ems. .44z Ii 4 •da. ,Y f F� a� 'L2 �� &SoI�X rkF, G�R 7I .XwuyiY."!` irc f ( uF , . post- north Type 1124-hr 100 yrpr in Rainted fa51/12=/92.01104 o2 " Prepared by{enter your company013HydroCADnamehereI HydroCADO 10.00 s/n 08123Software Solutions LLC Page 10 Pond 3P: Detention Basin #1 Hydrograph Inflow ..1. ' El Pnmary 42t / __, _ _ _v 44 .' / 1 39 34cfs I Inflow Area=2.580 ac 'il ' Peak Elev=664.-46 38--- , 4, .., , 3334261:: ::;,,,,171:i , StOtfage-16,394 et 28i ' / //e-/ <:',,'),• .13 24-i ,• , fij ' , V, 22O4 LI- 18-: • /,,4 , 10t • v;;;"0., 3' ' z ihk','„1:4:,,,,g0-.......,-'''''',,' ', /,, `, • -',“/' /''',/,;/,''',,;;;,/, ,,,,,;,,,,, - 6 7 8 9 10 11 12 13 Time (hours) post- north Type 1124-hr 100 yr Printed Rain fa5//p2=/a92g.0:1043" re red by{enter your company yname here} HydroCAD®Ppa10.00 s/n 08123 © 2013 HydroCAD Software Solutions LLC Summary for Link 6L: (new Link) Inflow Area = 6.216 ac, 33.82% Impervious,olume= 327a Inflow Depthi> 6f.21" for 100 yr event Inflow = 52.10 cfs @ 12.00hrs, Volume= Primary = 52.10 cfs @ 12.00 hrs, Volume= 3.217 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span=5.00-20.00 hrs, dt= 0.05 hrs Link 6L: (new Link) Hydrograph [2:...1 El Primary / 15210cfs I 15210d; Inflow Area=6.216 ac 55-7: - P ' ' = • „* 50:" 451 40-- j0, • : / * U) . — 30: ,,,4", O i Z 25: / 20:-' , f.., 151-, ' Adip:frs„„, , /,.,,• ,/,-, )",,,,/, ''t,..,,%:-, ;,(•%-7 •";,,,,,e// 5- , ,„ , % •/, ,',,,, „27,,,,,, ' ,11 12 13 15 16 17 18 19 14 20 ,0 0 5 6 7 8 l Time (hours) pre- north Type 1124-hr 2 yr Rainfall=3.70" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 1 Summary for Subcatchment 1S: (new Subcat) Runoff = 6.46 cfs @ 12.21 hrs, Volume= 0.530 af, Depth> 1.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2 yr Rainfall=3.70" Area (ac) CN Description 0.050 98 Roofs, HSG C 0.210 96 Gravel surface, HSG C 0.660 92 Paved roads w/open ditches, 50% imp, HSG C 1.090 74 >75% Grass cover, Good, HSG C 2.864 70 Woods, Good, HSG C 4.874 75 Weighted Average 4.494 92.20% Pervious Area 0.380 7.80% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.1 140 0.0500 0.13 Sheet Flow, Overland Woods: Light underbrush n= 0.400 P2= 3.70" 8.0 705 0.0220 1.47 0.15 Channel Flow, Channel Area= 0.1 sf Perim= 0.1' r= 1.00' n= 0.150 Sheet flow over Short Grass 26.1 845 Total Subcatchment 1S: (new Subcat) Hydrograph 7 0 Runoff arri 6- } Type I124-hr Pp 2 yr Rainfall=3.70" 5 " IA Runoff Area=4.874 ac_ s. ,10 Runoff Volume=0.53O af 3 4:- la Runoff Depth>1.30" 3 Flores Length=851 Tc=26.1 min 2 GN75 b -- 494 re dor, .4r. '"?.4.41r4Sredlageteir 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) pre- north Type 1124-hr 10 yr Rainfall=5.60" Prepared by{enter your company name here} Printed 5/1/2014 HydroCAD® 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 1S: (new Subcat) Runoff = 13.54 cfs @ 12.20 hrs, Volume= 1.095 af, Depth> 2.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 yr Rainfall=5.60" Area (ac) CN Description 0.050 98 Roofs, HSG C 0.210 96 Gravel surface, HSG C 0.660 92 Paved roads w/open ditches, 50% imp, HSG C 1.090 74 >75% Grass cover, Good, HSG C 2.864 70 Woods, Good, HSG C 4.874 75 /Weighted Average 4.494 92.20% Pervious Area 0.380 7.80% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.1 140 0.0500 0.13 Sheet Flow, Overland Woods: Light underbrush n= 0.400 P2= 3.70" 8.0 705 0.0220 1.47 0.15 Channel Flow, Channel Area= 0.1 sf Perim= 0.1' r= 1.00' n= 0.150 Sheet flow over Short Grass 26.1 845 Total Subcatchment 1S: (new Subcat) Hydrograph 15 14_ 13.54 ors 4, Type 11 Z4hr .. ....._...... 12i "1 10 yr Rainfall=5 60" ri Runoff Area=4.874-ac - 01 FA Runoff Volulrr>le 1 095 af is 9- 8= Runoff Depth>2.70" 0" Flow Length:84-5:- 6_ �_ Tc=26.1 min ... 4� CN- 75 3- 010: 1- ra 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ,pre- north Type 1124-hr 100 yr Rainfall=9.10" Prepared by {enter your company name here} Printed 5/1/2014 HydroCADO 10.00 s/n 08123 ©2013 HydroCAD Software Solutions LLC Pace 3 Summary for Subcatchment 1S: (new Subcat) Runoff = 27.73 cfs @ 12.19 hrs, Volume= 2.275 af, Depth> 5.60" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 yr Rainfall=9.10" Area (ac) CN Description 0.050 98 Roofs, HSG C 0.210 96 Gravel surface, HSG C 0.660 92 Paved roads w/open ditches, 50% imp, HSG C 1.090 74 >75% Grass cover, Good, HSG C 2.864 70 Woods, Good, HSG C 4.874 75 Weighted Average 4.494 92.20% Pervious Area 0.380 7.80% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.1 140 0.0500 0.13 Sheet Flow, Overland Woods: Light underbrush n= 0.400 P2= 3.70" 8.0 705 0.0220 1.47 0.15 Channel Flow, Channel Area= 0.1 sf Perim= 0.1' r= 1.00' n= 0.150 Sheet flow over Short Grass 26.1 845 Total Subcatchment 1S: (new Subcat) Hydrograph LE.R1. ,2L1 28- 27.73 ds Type II 24-hr 26 24 100 yr Rainfall=9 10" 22� Runoff Area=4.874 ac -_ 20. ,$_ - Runoff Volume=2.275 af ,6- Runoff Depth>5.60" LL 14 Flow Length=845' 12: ,o. Tc=26.1 min CN=75 2v o_ 5 6 7 8 9 10 11 12 1'3 14 15 16 17 1'8 19 20 Time (hours) PROJECT MANAGEMENT S A* CIVIL ENGINEERING LAND PLANNING V • April 12, 2017 Frank Pohl County Engineer Albemarle County Department of Community Development 401 McIntire Rd Charlottesville, VA 22902 Regarding: Out of Bounds As-built Stormwater Report Dear Mr. Pohl, Two infiltration/detention facilities have been built to handle both storm quantity as well as quality. Below is a summary of the pre and post development peak flows for both the North Side (Barracks Road side) and the South Side (Smithfield Road Side). Measurements of both systems were taken and the flow calculations have been updated to reflect as-built conditions. Pre Post As-built North Side 2 Yr 8.62 -8752- 8.61 10 Yr 17.25 1723 17.24 South Side 2 Yr 10.89 1-0.72- 10.74 10 yr 24.20 23.96 23.99 If you have any questions please feel free to contact me via at Justin anshimp-enqineering.com or by telephone at 434-227-5140. Bes s, 1 /ice JuOtin Shimp Shimp Engineering, P.C. 4L Point o nalysis BMP #1 Underground Detention is) Drainage Area BMP #1 (28) Bypass Area SO Reach 0 6A, Link Drainage Diagram for Post Development-North Side 2WQV-ASBUILT Prepared by Shimp Engineering, Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Post Development- North Side 2WQV-ASBUILT Type 1124-hr2 Yr Storm Rainfall=3.67" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 sin 07054 ©2011 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 1S: Drainage Area BMP#1 Runoff = 8.78 cfs @ 12.03 hrs, Volume= 0.518 af, Depth> 2.51" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2 Yr Storm Rainfall=3.67" Area (ac) CN Description 1.620 98 Paved parking, HSG C 0.860 71 Meadow, non-grazed, HSG C 2.480 89 Weighted Average 0.860 34.68% Pervious Area 1.620 65.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.9 Direct Entry, Summary for Subcatchment 2S: Bypass Area Runoff = 5.51 cfs @ 12.14 hrs, Volume= 0.423 af, Depth> 1.55" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2 Yr Storm Rainfall=3.67" Area (ac) CN Description 1.400 70 Woods, Good, HSG C 0.800 98 Paved parking, HSG C 1.080 71 Meadow, non-grazed, HSG C 3.280 77 Weighted Average 2.480 75.61% Pervious Area 0.800 24.39% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 Direct Entry, Summary for Pond 3P: BMP#1 Underground Detention Inflow Area= 2.480 ac, 65.32% Impervious, Inflow Depth > 2.51" for 2 Yr Storm event Inflow = 8.78 cfs @ 12.03 hrs, Volume= 0.518 af Outflow = 3.19 cfs @ 12.21 hrs, Volume= 0.379 af, Atten= 64%, Lag= 10.5 min Primary = 3.19 cfs @ 12.21 hrs, Volume= 0.379 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 567.75' @ 12.21 hrs Surf.Area= 0.073 ac Storage= 0.233 of Plug-Flow detention time= 157.8 min calculated for 0.379 af (73% of inflow) Center-of-Mass det. time= 65.8 min ( 872.2 - 806.4 ) Post Development- North Side 2WQV-ASBUILT Type 1124-hr 2 Yr Storm Rainfall=3.67" Prepared by Shimp Engineering Printed 4/12/2017 HydroCADO 9.10 sin 07054 ©2011 HydroCAD Software Solutions LLC Page 3 Volume Invert Avail.Storage Storage Description #1 562.57' 0.192 of 28.00'W x 114.00'L x 10.00'H Drainfield 0.733 af Overall - 0.254 af Embedded = 0.479 af x 40.0%Voids #2 563.57' 0.254 af 96.0" D x 110.0'L Pipe Storage x 2 Inside#1 0.445 af Total Available Storage Device Routing Invert Outlet Devices #1 Primary 564.90' 18.0" Round Culvert L= 52.4' Ke= 0.400 Inlet/Outlet Invert= 564.90'/564.58' S= 0.0061 '/' Cc= 0.900 n=0.013 #2 Device 1 565.87' 9.0"W x 8.6" H Vert. 2 Yr Orifice C= 0.600 #3 Device 1 567.82' 4.0"W x 5.7" H Vert. 10 Yr Orifice C= 0.600 #4 Device 1 570.32' 5.5' long 100 Yr Weir 2 End Contraction(s) #5 Device 1 570.32' 5.5' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=3.19 cfs @ 12.21 hrs HW=567.75' (Free Discharge) L1=Culvert (Passes 3.19 cfs of 11.95 cfs potential flow) 2=2 Yr Orifice (Orifice Controls 3.19 cfs @ 5.93 fps) 3=10 Yr Orifice ( Controls 0.00 cfs) =100 Yr Weir ( Controls 0.00 cfs) 5=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Summary for Link 4L: Point of Analysis Inflow Area= 5.760 ac, 42.01% Impervious, Inflow Depth > 1.67" for 2 Yr Storm event Inflow = 8.61 cfs @ 12.15 hrs, Volume= 0.803 of Primary = 8.61 cfs @ 12.15 hrs, Volume= 0.803 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span=0.00-24.00 hrs, dt= 0.01 hrs Post Development- North Side 2WQV-ASBUILT Type 1124-hr 10 Yr Storm Rainfall=5.54" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 1S: Drainage Area BMP#1 Runoff = 14.58 cfs @ 12.03 hrs, Volume= 0.885 af, Depth> 4.28" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Yr Storm Rainfall=5.54" Area (ac) CN Description 1.620 98 Paved parking, HSG C 0.860 71 Meadow, non-grazed, HSG C 2.480 89 Weighted Average 0.860 34.68% Pervious Area 1.620 65.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.9 Direct Entry, Summary for Subcatchment 2S: Bypass Area Runoff = 11.06 cfs @ 12.13 hrs, Volume= 0.838 af, Depth> 3.06" Runoff by SCS TR-20 method,.UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Yr Storm Rainfall=5.54" Area (ac) CN Description 1.400 70 Woods, Good, HSG C 0.800 98 Paved parking, HSG C 1.080 71 Meadow, non-grazed, HSG C 3.280 77 Weighted Average 2.480 75.61% Pervious Area 0.800 24.39% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 Direct Entry, Summary for Pond 3P: BMP#1 Underground Detention Inflow Area= 2.480 ac, 65.32% Impervious, Inflow Depth > 4.28" for 10 Yr Storm event Inflow = 14.58 cfs @ 12.03 hrs, Volume= 0.885 af Outflow = 6.27 cfs @ 12.18 hrs, Volume= 0.744 af, Atten= 57%, Lag=9.2 min Primary = 6.27 cfs @ 12.18 hrs, Volume= 0.744 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 570.20' @ 12.18 hrs Surf.Area= 0.073 ac Storage= 0.359 af Plug-Flow detention time= 123.6 min calculated for 0.744 af (84%of inflow) Center-of-Mass det. time= 54.4 min ( 845.8 - 791.5 ) Post Development- North Side 2WQV-ASBUILT Type 1124-hr 10 Yr Storm Rainfall=5.54" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 5 Volume Invert Avail.Storage Storage Description #1 562.57' 0.192 of 28.00'W x 114.00'L x 10.00'H Drainfield 0.733 af Overall - 0.254 of Embedded = 0.479 af x 40.0%Voids #2 563.57' 0.254 af 96.0" D x 110.0'L Pipe Storage x 2 Inside#1 0.445 af Total Available Storage Device Routing Invert Outlet Devices #1 Primary 564.90' 18.0" Round Culvert L= 52.4' Ke= 0.400 Inlet/Outlet Invert= 564.90'/564.58' S= 0.0061 '/' Cc= 0.900 n= 0.013 #2 Device 1 565.87' 9.0"W x 8.6" H Vert. 2 Yr Orifice C= 0.600 #3 Device 1 567.82' 4.0"W x 5.7" H Vert. 10 Yr Orifice C= 0.600 #4 Device 1 570.32' 5.5' long 100 Yr Weir 2 End Contraction(s) #5 Device 1 570.32' 5.5' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=6.27 cfs @ 12.18 hrs HW=570.20' (Free Discharge) L1=Culvert (Passes 6.27 cfs of 18.75 cfs potential flow) 2=2 Yr Orifice (Orifice Controls 5.16 cfs @ 9.60 fps) 3=10 Yr Orifice (Orifice Controls 1.12 cfs @ 7.05 fps) =100 Yr Weir ( Controls 0.00 cfs) 5=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Summary for Link 4L: Point of Analysis Inflow Area= 5.760 ac, 42.01% Impervious, Inflow Depth > 3.29" for 10 Yr Storm event Inflow = 17.24 cfs @ 12.15 hrs, Volume= 1.581 af Primary = 17.24 cfs @ 12.15 hrs, Volume= 1.581 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Post Development- North Side 2WQV-ASBUILT Type 1124-hr 100 Yr Storm Rainfall=9.09" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1 S: Drainage Area BMP#1 Runoff = 25.46 cfs @ 12.03 hrs, Volume= 1.600 af, Depth> 7.74" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Yr Storm Rainfall=9.09" Area (ac) CN Description 1.620 98 Paved parking, HSG C 0.860 71 Meadow, non-grazed, HSG C 2.480 89 Weighted Average 0.860 34.68% Pervious Area 1.620 65.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.9 Direct Entry, Summary for Subcatchment 2S: Bypass Area Runoff = 22.30 cfs @ 12.13 hrs, Volume= 1.709 af, Depth> 6.25" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Yr Storm Rainfall=9.09" Area (ac) CN Description 1.400 70 Woods, Good, HSG C 0.800 98 Paved parking, HSG C 1.080 71 Meadow, non-grazed, HSG C 3.280 77 Weighted Average 2.480 75.61% Pervious Area 0.800 24.39% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 Direct Entry, Summary for Pond 3P: BMP#1 Underground Detention Inflow Area= 2.480 ac, 65.32% Impervious, Inflow Depth > 7.74" for 100 Yr Storm event Inflow = 25.46 cfs @ 12.03 hrs, Volume= 1.600 af Outflow = 21.48 cfs @ 12.09 hrs, Volume= 1.455 af, Atten= 16%, Lag=3.7 min Primary = 21.48 cfs @ 12.09 hrs, Volume= 1.455 af Routing by Stor-lnd method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 571.49' @ 12.09 hrs Surf.Area= 0.073 ac Storage= 0.414 af Plug-Flow detention time= 91.1 min calculated for 1.455 af (91%of inflow) Center-of-Mass det. time=44.2 min ( 820.0 - 775.7) Post Development- North Side 2WQV-ASBUILT Type 1124-hr 100 Yr Storm Rainfall=9.09" Prepared by Shimp Engineering Printed 4/12/2017 HydroCADO 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 7 Volume Invert Avail.Storage Storage Description #1 562.57' 0.192 of 28.00'W x 114.00'L x 10.00'H Drainfield 0.733 of Overall - 0.254 af Embedded = 0.479 af x 40.0%Voids #2 563.57' 0.254 of 96.0" D x 110.0'L Pipe Storage x 2 Inside#1 0.445 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 564.90' 18.0" Round Culvert L= 52.4' Ke= 0.400 Inlet/Outlet Invert= 564.90'/564.58' S= 0.0061 '/' Cc= 0.900 n= 0.013 #2 Device 1 565.87' 9.0"W x 8.6" H Vert. 2 Yr Orifice C= 0.600 #3 Device 1 567.82' 4.0"W x 5.7" H Vert. 10 Yr Orifice C= 0.600 #4 Device 1 570.32' 5.5' long 100 Yr Weir 2 End Contraction(s) #5 Device 1 570.32' 5.5' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=21.48 cfs @ 12.09 hrs HW=571.49' (Free Discharge) Z1=Culvert (Barrel Controls 21.48 cfs @ 12.15 fps) 2=2 Yr Orifice (Passes < 5.93 cfs potential flow) 3=10 Yr Orifice (Passes < 1.41 cfs potential flow) =100 Yr Weir (Passes < 21.74 cfs potential flow) =Sharp-Crested Rectangular Weir (Passes < 21.74 cfs potential flow) Summary for Link 4L: Point of Analysis Inflow Area= 5.760 ac, 42.01% Impervious, Inflow Depth > 6.59" for 100 Yr Storm event Inflow = 43.57 cfs @ 12.11 hrs, Volume= 3.165 of Primary = 43.57 cfs @ 12.11 hrs, Volume= 3.165 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs I f (:,:;',:*4::::, ,,z,z,,i) .._ .. -P. ..,,,,. .,. --------------------------i> - „ Drainage Area to BMP #2 BMP #2 Reach ,-, , Link Drainage Diagram for Post Development-South Side 2W0V-ASBUILT Prepared by Shimp Engineering, Printed 4/12/2017 HydroCAD®9 10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Post Development- South Side 2WQV-ASBUILT Type 1124-hr 2 Yr Storm Rainfall=3.67" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 1S: Drainage Area to BMP#2 Runoff = 17.89 cfs @ 12.12 hrs, Volume= 1.326 af, Depth> 1.84" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2 Yr Storm Rainfall=3.67" Area (ac) CN Description 0.950 90 1/8 acre lots, 65% imp, HSG C 2.140 70 Woods, Good, HSG C 2.690 98 Paved parking, HSG C 2.880 71 Meadow, non-grazed, HSG C 8.660 81 Weighted Average 5.352 61.81% Pervious Area 3.307 38.19% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.8 Direct Entry, Summary for Pond 2P: BMP#2 Inflow Area= 8.660 ac, 38.19% Impervious, Inflow Depth > 1.84" for 2 Yr Storm event Inflow = 17.89 cfs @ 12.12 hrs, Volume= 1.326 of Outflow = 10.74 cfs @ 12.30 hrs, Volume= 1.083 af, Atten=40%, Lag= 10.3 min Primary = 10.74 cfs @ 12.30 hrs, Volume= 1.083 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 557.05' @ 12.30 hrs Surf.Area= 0.115 ac Storage= 0.413 af Plug-Flow detention time= 118.6 min calculated for 1.082 af (82%of inflow) Center-of-Mass det. time=41.1 min ( 880.3 - 839.2 ) Volume Invert Avail.Storage Storage Description #1 551.53' 0.297 af 27.00'W x 186.00'L x 11.00'H Drainage Field 1.268 af Overall - 0.526 af Embedded = 0.742 af x 40.0%Voids #2 552.53' 0.526 af 108.0" D x 180.0'L Pipe Storage x 2 Inside#1 0.823 af Total Available Storage Device Routing Invert Outlet Devices #1 Primary 552.87' 24.0" Round Culvert L= 15.1' Ke= 0.500 Inlet/Outlet Invert= 552.53'/552.87' S= -0.0225 '/' Cc= 0.900 n=0.015 #2 Device 1 555.00' 19.2"W x 13.9" H Vert. 2 Yr Orifice C= 0.600 #3 Device 1 557.13' 1.0' long 10 Yr 2 End Contraction(s) #4 Device 1 559.53' 7.4' long 100 Yr Orifice 2 End Contraction(s) #5 Primary 559.53' 18.0" Round 100 Yr Culvert L= 20.0' Ke= 0.500 Inlet/Outlet Invert= 559.53'/556.00' S= 0.1765 '/' Cc= 0.900 n= 0.018 #6 Device 1 559.53' 7.4' long 100 YR WEIR PLATE 2 End Contraction(s) Post Development- South Side 2WQV-ASBUILT Type 1124-hr 2 Yr Storm Rainfall=3.67" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 3 Primary OutFlow Max=10.73 cfs @ 12.30 hrs HW=557.05' (Free Discharge) —1=Culvert (Passes 10.73 cfs of 26.96 cfs potential flow) 'r_.4. 2=2 Yr Orifice (Orifice Controls 10.73 cfs @ 5.79 fps) 3=10 Yr ( Controls 0.00 cfs) =100 Yr Orifice ( Controls 0.00 cfs) 6=100 YR WEIR PLATE ( Controls 0.00 cfs) 5=100 Yr Culvert ( Controls 0.00 cfs) Post Development- South Side 2WQV-ASBUILT Type 1124-hr 10 Yr Storm Rainfall=5.54" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 1S: Drainage Area to BMP#2 Runoff = 33.56 cfs @ 12.12 hrs, Volume= 2.490 af, Depth> 3.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Yr Storm Rainfall=5.54" Area (ac) CN Description 0.950 90 1/8 acre lots, 65% imp, HSG C 2.140 70 Woods, Good, HSG C 2.690 98 Paved parking, HSG C 2.880 71 Meadow, non-grazed, HSG C 8.660 81 Weighted Average 5.352 61.81% Pervious Area 3.307 38.19% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.8 Direct Entry, Summary for Pond 2P: BMP#2 Inflow Area= 8.660 ac, 38.19% Impervious, Inflow Depth > 3.45" for 10 Yr Storm event Inflow = 33.56 cfs @ 12.12 hrs, Volume= 2.490 af Outflow = 23.99 cfs @ 12.25 hrs, Volume= 2.242 af, Atten= 29%, Lag= 7.9 min Primary = 23.99 cfs @ 12.25 hrs, Volume= 2.242 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 559.52' @ 12.25 hrs Surf.Area= 0.115 ac Storage= 0.631 of Plug-Flow detention time= 79.3 min calculated for 2.242 of (90%of inflow) Center-of-Mass det. time= 29.8 min ( 851.3 - 821.5 ) Volume Invert Avail.Storage Storage Description #1 551.53' 0.297 af 27.00'W x 186.00'L x 11.00'H Drainage Field 1.268 af Overall - 0.526 af Embedded = 0.742 af x 40.0%Voids #2 552.53' 0.526 af 108.0" D x 180.0'L Pipe Storage x 2 Inside#1 0.823 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 552.87' 24.0" Round Culvert L= 15.1' Ke= 0.500 Inlet/Outlet Invert= 552.53'/552.87' S= -0.0225 'I' Cc= 0.900 n= 0.015 #2 Device 1 555.00' 19.2"W x 13.9" H Vert. 2 Yr Orifice C= 0.600 #3 Device 1 557.13' 1.0' long 10 Yr 2 End Contraction(s) #4 Device 1 559.53' 7.4' long 100 Yr Orifice 2 End Contraction(s) #5 Primary 559.53' 18.0" Round 100 Yr Culvert L= 20.0' Ke= 0.500 Inlet/Outlet Invert= 559.53'/556.00' S= 0.1765 '/' Cc= 0.900 n= 0.018 #6 Device 1 559.53' 7.4' long 100 YR WEIR PLATE 2 End Contraction(s) Post Development- South Side 2WQV-ASBUILT Type 1124-hr 10 Yr Storm Rainfall=5.54" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 5 Primary OutFlow Max=23.99 cfs @ 12.25 hrs HW=559.51' (Free Discharge) —1=Culvert (Passes 23.99 cfs of 35.94 cfs potential flow) dr..„4 2=2 Yr Orifice (Orifice Controls 17.69 cfs @ 9.54 fps) 3=10 Yr (Weir Controls 6.30 cfs @ 5.05 fps) =100 Yr Orifice ( Controls 0.00 cfs) 6=100 YR WEIR PLATE ( Controls 0.00 cfs) 5=100 Yr Culvert ( Controls 0.00 cfs) Post Development- South Side 2WQV-ASBUILT Type 1124-hr 100 Yr Storm Rainfall=9.09" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1S: Drainage Area to BMP#2 Runoff = 64.23 cfs @ 12.12 hrs, Volume= 4.870 af, Depth> 6.75" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Yr Storm Rainfall=9.09" Area (ac) CN Description 0.950 90 1/8 acre lots, 65% imp, HSG C 2.140 70 Woods, Good, HSG C 2.690 98 Paved parking, HSG C 2.880 71 Meadow, non-grazed, HSG C 8.660 81 Weighted Average 5.352 61.81% Pervious Area 3.307 38.19% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.8 Direct Entry, Summary for Pond 2P: BMP#2 Inflow Area= 8.660 ac, 38.19% Impervious, Inflow Depth > 6.75" for 100 Yr Storm event Inflow = 64.23 cfs @ 12.12 hrs, Volume= 4.870 of Outflow = 56.48 cfs @ 12.19 hrs, Volume= 4.613 af, Atten= 12%, Lag=4.5 min Primary = 56.48 cfs @ 12.19 hrs, Volume= 4.613 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 562.38' @ 12.19 hrs Surf.Area= 0.115 ac Storage= 0.816 of Plug-Flow detention time= 53.6 min calculated for 4.613 of (95% of inflow) Center-of-Mass det. time= 24.1 min ( 826.9 - 802.8 ) Volume Invert Avail.Storage Storage Description #1 551.53' 0.297 af 27.00'W x 186.001 x 11.00'H Drainage Field 1.268 af Overall - 0.526 af Embedded = 0.742 af x 40.0%Voids #2 552.53' 0.526 af 108.0" D x 180.0'L Pipe Storage x 2 Inside#1 0.823 of Total Available Storage Device Routing Invert Outlet Devices #1 Primary 552.87' 24.0" Round Culvert L= 15.1' Ke= 0.500 Inlet/Outlet Invert= 552.53'/552.87' S= -0.0225 '/' Cc= 0.900 n=0.015 #2 Device 1 555.00' 19.2"W x 13.9" H Vert. 2 Yr Orifice C= 0.600 #3 Device 1 557.13' 1.0' long 10 Yr 2 End Contraction(s) #4 Device 1 559.53' 7.4' long 100 Yr Orifice 2 End Contraction(s) #5 Primary 559.53' 18.0" Round 100 Yr Culvert L= 20.0' Ke= 0.500 Inlet/Outlet Invert= 559.53'/556.00' S= 0.1765 '/' Cc= 0.900 n= 0.018 #6 Device 1 559.53' 7.4' long 100 YR WEIR PLATE 2 End Contraction(s) Post Development- South Side 2WQV-ASBUILT Type 1124-hr 100 Yr Storm Rainfall=9.09" Prepared by Shimp Engineering Printed 4/12/2017 HydroCAD®9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 7 Primary OutFlow Max=56.46 cfs @ 12.19 hrs HW=562.38' (Free Discharge) —1=Culvert (Inlet Controls 44.13 cfs @ 14.05 fps) 2=2 Yr Orifice (Passes < 23.26 cfs potential flow) 3=10 Yr (Passes < 19.67 cfs potential flow) =100 Yr Orifice (Passes < 107.46 cfs potential flow) =100 YR WEIR PLATE (Passes < 107.46 cfs potential flow) 5=100 Yr Culvert (Inlet Controls 12.33 cfs @ 6.98 fps)