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HomeMy WebLinkAboutWPO200600048 Calculations WPO VSMP 2018-11-24Belvedere — Phase I ALBEMARLE COUNTY, VIRGINIA WPO AMENDMENT DESIGN CALCULATIONS & NARRATIVE NOVEMBER 13, 2018 0000000 • * 0 TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: John Wilson, PE Timmons Group 608 Preston Ave STE 200 Charlottesville, VA 22903 434.327.1684 U CRAIG W J. KCTARS Ki > Lie. No. 0402M507 A by the Albemadc' CcAffi Y CommunityLWE'l �y►T03�'t ryr, Q+1x?"s• Mate_ adl� _ Pile Table of Contents Section Title Pre-Developed/Post-Developed HyrdoCAD Calculations 1S ( ( 2S 3S Pre -1 A Post 1 A FP st 1A ON X4 1 IA 5L (new Link) Subcat Reach On Link Routing Diagram for WPO Amendment Prepared by Timmons Group, Printed 7/12/2018 EHydroIAD@ 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC WPO Amendment Prepared by Timmons Group Printed 7/12/2018 _H_ydroCAD®10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 35.400 76 (1S) 13.050 98 (2S, 3S) 26.680 74 (2S, 3S) 0.390 91 (2S) 0.210 88 (2S) 2.000 61 (2S) 77.730 79 TOTAL AREA WPO Amendment Prepared by Timmons Group Printed 7/12/2018 HydroCAD®10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 3 Ground Covers (all nodes) HSG -A HSG -B HSG -C HSG -D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 0.000 77.730 77.730 1 S, 2S, 3S 0.000 0.000 0.000 0.000 77.730 77.730 TOTAL AREA WPO Amendment Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 4 Pipe Listing (all 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 4P 388.00 383.95 80.0 0.0506 0.025 24.0 0.0 0.0 WPO Amendment Type// 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 5 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS, Weighted -CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre AA Runoff Area=35.400 ac 0.00% Impervious Runoff Depth>1.73" Tc=16.5 min CN=76 Runoff=74.94 cfs 5.106 of Subcatchment2S: Post 1A OFF Runoff Area=36.050 ac 24.72% Impervious Runoff Depth>1.96" Tc=14.8 min CN=79 Runoff=91.41 cfs 5.877 of Subcatchment3S: Post 1A ON Runoff Area=6.280 ac 65.92% Impervious Runoff Depth>2.91" Tc=14.8 min CN=90 Runoff=23.07 cfs 1.523 of Pond 4P: 1A Peak Elev=397.58' Storage=137,362 cf Inflow=114.45 cfs 7.400 of Outflow=34.98 cfs 5.320 of Link 5L: (new Link) Inflow=34.98 cfs 5.320 of Primary=34.98 cfs 5.320 of Total Runoff Area = 77.730 ac Runoff Volume = 12.506 of Average Runoff Depth = 1.93" 83.21% Pervious = 64.680 ac 16.79% Impervious = 13.050 ac WPO Amendment Type 11 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1S: Pre -1 A Runoff = 74.94 cfs @ 12.09 hrs, Volume= 5.106 af, Depth> 1.73" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 YR Rainfall=4.00" Area (ac) CN Description 35.400 76 35.400 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 Direct Entry, Subcatchment 1S: Pre -1A Hydrograph v i c a a o o 1 13 5 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff WPO Amendment Type// 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 7 Hydrograph for Subcatchment 1S: Pre -1A Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.25 0.01 0.00 0.00 0.50 0.02 0.00 0.00 0.75 0.03 0.00 0.00 1.00 0.04 0.00 0.00 1.25 0.05 0.00 0.00 1.50 0.06 0.00 0.00 1.75 0.08 0.00 0.00 2.00 0.09 0.00 0.00 2.25 0.10 0.00 0.00 2.50 0.11 0.00 0.00 2.75 0.13 0.00 0.00 3.00 0.14 0.00 0.00 3.25 0.15 0.00 0.00 3.50 0.16 0.00 0.00 3.75 0.18 0.00 0.00 4.00 0.19 0.00 0.00 4.25 0.21 0.00 0.00 4.50 0.22 0.00 0.00 4.75 0.24 0.00 0.00 5.00 0.25 0.00 0.00 5.25 0.27 0.00 0.00 5.50 0.29 0.00 0.00 5.75 0.30 0.00 0.00 6.00 0.32 0.00 0.00 6.25 0.34 0.00 0.00 6.50 0.36 0.00 0.00 6.75 0.38 0.00 0.00 7.00 0.40 0.00 0.00 7.25 0.42 0.00 0.00 7.50 0.44 0.00 0.00 7.75 0.46 0.00 0.00 8.00 0.48 0.00 0.00 8.25 0.50 0.00 0.00 8.50 0.53 0.00 0.00 8.75 0.56 0.00 0.00 9.00 0.59 0.00 0.00 9.25 0.62 0.00 0.00 9.50 0.65 0.00 0.00 9.75 0.69 0.00 0.06 10.00 0.72 0.00 0.17 10.25 0.77 0.01 0.32 10.50 0.82 0.01 0.53 10.75 0.87 0.02 0.81 11.00 0.94 0.03 1.22 11.25 1.02 0.04 1.82 11.50 1.13 0.07 2.89 11.75 1.55 0.21 8.79 12.00 2.65 0.79 56.52 12.25 2.82 0.90 41.98 12.50 2.94 0.97 16.03 12.75 3.02 1.03 9.33 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.00 3.09 1.07 7.23 13.25 3.15 1.11 6.08 13.50 3.20 1.15 5.34 13.75 3.24 1.18 4.71 14.00 3.28 1.21 4.21 14.25 3.32 1.23 3.79 14.50 3.35 1.26 3.57 14.75 3.38 1.28 3.41 15.00 3.41 1.30 3.24 15.25 3.44 1.32 3.08 15.50 3.47 1.34 2.91 15.75 3.50 1.36 2.74 16.00 3.52 1.38 2.57 16.25 3.54 1.40 2.41 16.50 3.56 1.41 2.33 16.75 3.59 1.43 2.27 17.00 3.61 1.44 2.21 17.25 3.63 1.46 2.15 17.50 3.65 1.47 2.09 17.75 3.67 1.49 2.03 18.00 3.68 1.50 1.97 18.25 3.70 1.51 1.91 18.50 3.72 1.53 1.84 18.75 3.74 1.54 1.78 19.00 3.75 1.55 1.72 19.25 3.77 1.56 1.65 19.50 3.78 1.57 1.59 19.75 3.79 1.58 1.53 20.00 3.81 1.59 1.46 20.25 3.82 1.60 1.41 20.50 3.83 1.61 1.38 20.75 3.85 1.62 1.37 21.00 3.86 1.63 1.36 21.25 3.87 1.64 1.35 21.50 3.88 1.65 1.34 21.75 3.90 1.66 1.32 22.00 3.91 1.67 1.31 22.25 3.92 1.68 1.30 22.50 3.93 1.69 1.29 22.75 3.94 1.70 1.28 23.00 3.95 1.70 1.26 23.25 3.97 1.71 1.25 23.50 3.98 1.72 1.24 23.75 3.99 1.73 1.23 24.00 4.00 1.74 1.22 WPO Amendment Type 1124 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 2S: Post 1A OFF Runoff = 91.41 cfs @ 12.07 hrs, Volume= 5.877 af, Depth> 1.96" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 YR Rainfall=4.00" Area (ac) CN Description 8.910 98 24.540 74 0.390 91 0.210 88 2.000 61 36.050 79 Weighted Average 27.140 75.28% Pervious Area 8.910 24.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.8 Direct Entry, 0 w U 3 0 LL Subcatchment 2S: Post 1A OFF 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Runoff WPO Amendment Type 1124 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCADO 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 9 Hydrograph for Subcatchment 2S: Post 1A OFF Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.25 0.01 0.00 0.00 0.50 0.02 0.00 0.00 0.75 0.03 0.00 0.00 1.00 0.04 0.00 0.00 1.25 0.05 0.00 0.00 1.50 0.06 0.00 0.00 1.75 0.08 0.00 0.00 2.00 0.09 0.00 0.00 2.25 0.10 0.00 0.00 2.50 0.11 0.00 0.00 2.75 0.13 0.00 0.00 3.00 0.14 0.00 0.00 3.25 0.15 0.00 0.00 3.50 0.16 0.00 0.00 3.75 0.18 0.00 0.00 4.00 0.19 0.00 0.00 4.25 0.21 0.00 0.00 4.50 0.22 0.00 0.00 4.75 0.24 0.00 0.00 5.00 0.25 0.00 0.00 5.25 0.27 0.00 0.00 5.50 0.29 0.00 0.00 5.75 0.30 0.00 0.00 6.00 0.32 0.00 0.00 6.25 0.34 0.00 0.00 6.50 0.36 0.00 0.00 6.75 0.38 0.00 0.00 7.00 0.40 0.00 0.00 7.25 0.42 0.00 0.00 7.50 0.44 0.00 0.00 7.75 0.46 0.00 0.00 8.00 0.48 0.00 0.00 8.25 0.50 0.00 0.00 8.50 0.53 0.00 0.00 8.75 0.56 0.00 0.01 9.00 0.59 0.00 0.09 9.25 0.62 0.00 0.20 9.50 0.65 0.01 0.30 9.75 0.69 0.01 0.41 10.00 0.72 0.01 0.58 10.25 0.77 0.02 0.79 10.50 0.82 0.03 1.08 10.75 0.87 0.04 1.46 11.00 0.94 0.05 2.00 11.25 1.02 0.08 2.80 11.50 1.13 0.11 4.20 11.75 1.55 0.28 13.20 12.00 2.65 0.94 76.04 12.25 2.82 1.06 41.35 12.50 2.94 1.14 16.21 12.75 3.02 1.20 9.72 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.00 3.09 1.25 7.82 13.25 3.15 1.30 6.59 13.50 3.20 1.33 5.80 13.75 3.24 1.37 5.11 14.00 3.28 1.40 4.56 14.25 3.32 1.42 4.11 14.50 3.35 1.45 3.89 14.75 3.38 1.48 3.71 15.00 3.41 1.50 3.53 15.25 3.44 1.52 3.34 15.50 3.47 1.54 3.16 15.75 3.50 1.56 2.97 16.00 3.52 1.58 2.78 16.25 3.54 1.60 2.61 16.50 3.56 1.62 2.53 16.75 3.59 1.63 2.47 17.00 3.61 1.65 2.40 17.25 3.63 1.67 2.33 17.50 3.65 1.68 2.27 17.75 3.67 1.70 2.20 18.00 3.68 1.71 2.13 18.25 3.70 1.72 2.06 18.50 3.72 1.74 1.99 18.75 3.74 1.75 1.93 19.00 3.75 1.76 1.86 19.25 3.77 1.78 1.79 19.50 3.78 1.79 1.72 19.75 3.79 1.80 1.65 20.00 3.81 1.81 1.58 20.25 3.82 1.82 1.52 20.50 3.83 1.83 1.50 20.75 3.85 1.84 1.48 21.00 3.86 1.85 1.47 21.25 3.87 1.86 1.46 21.50 3.88 1.87 1.44 21.75 3.90 1.88 1.43 22.00 3.91 1.89 1.42 22.25 3.92 1.90 1.40 22.50 3.93 1.91 1.39 22.75 3.94 1.92 1.38 23.00 3.95 1.93 1.36 23.25 3.97 1.94 1.35 23.50 3.98 1.95 1.34 23.75 3.99 1.95 1.32 24.00 4.00 1.96 1.31 WPO Amendment Type// 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 3S: Post 1A ON Runoff = 23.07 cfs @ 12.06 hrs, Volume= 1.523 af, Depth> 2.91" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 YR Rainfall=4.00" Area (ac) CN Description 3.660 98 22 ' 2.140 74 2 YR Rainfall=4.00" 0.480 98 17- 6.280 90 Weighted Average 2.140 Tc=14.8 min 34.08% Pervious Area 4.140 65.92% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.8 Direct Entry, Subcatchment 3S: Post 1A ON Hydrograph 24 F-23 07 22 Type II 24 -hr 20 2 YR Rainfall=4.00" 18 Runoff Area=6.280 ac i- 17- Runoff Volume=1.523 of v14 Runoff Depth>2.91"` 13 °12 LL Tc=14.8 min 14 CN=90 7 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Runoff WPO Amendment Type 1124 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCADO 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 11 Hydrograph for Subcatchment 3S: Post 1A ON Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.25 0.01 0.00 0.00 0.50 0.02 0.00 0.00 0.75 0.03 0.00 0.00 1.00 0.04 0.00 0.00 1.25 0.05 0.00 0.00 1.50 0.06 0.00 0.00 1.75 0.08 0.00 0.00 2.00 0.09 0.00 0.00 2.25 0.10 0.00 0.00 2.50 0.11 0.00 0.00 2.75 0.13 0.00 0.00 3.00 0.14 0.00 0.00 3.25 0.15 0.00 0.00 3.50 0.16 0.00 0.00 3.75 0.18 0.00 0.00 4.00 0.19 0.00 0.00 4.25 0.21 0.00 0.00 4.50 0.22 0.00 0.00 4.75 0.24 0.00 0.00 5.00 0.25 0.00 0.01 5.25 0.27 0.00 0.02 5.50 0.29 0.00 0.03 5.75 0.30 0.01 0.05 6.00 0.32 0.01 0.06 6.25 0.34 0.01 0.07 6.50 0.36 0.01 0.09 6.75 0.38 0.02 0.10 7.00 0.40 0.02 0.11 7.25 0.42 0.03 0.13 7.50 0.44 0.03 0.14 7.75 0.46 0.04 0.16 8.00 0.48 0.05 0.18 8.25 0.50 0.06 0.20 8.50 0.53 0.07 0.23 8.75 0.56 0.08 0.27 9.00 0.59 0.09 0.31 9.25 0.62 0.10 0.35 9.50 0.65 0.12 0.37 9.75 0.69 0.14 0.40 10.00 0.72 0.16 0.47 10.25 0.77 0.18 0.55 10.50 0.82 0.21 0.65 10.75 0.87 0.24 0.78 11.00 0.94 0.28 0.96 11.25 1.02 0.34 1.22 11.50 1.13 0.41 1.66 11.75 1.55 0.72 4.51 12.00 2.65 1.67 20.14 12.25 2.82 1.82 9.84 12.50 2.94 1.93 3.66 12.75 3.02 2.00 2.14 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.00 3.09 2.07 1.71 13.25 3.15 2.12 1.43 13.50 3.20 2.16 1.25 13.75 3.24 2.21 1.10 14.00 3.28 2.24 0.98 14.25 3.32 2.28 0.88 14.50 3.35 2.31 0.83 14.75 3.38 2.34 0.79 15.00 3.41 2.37 0.75 15.25 3.44 2.39 0.71 15.50 3.47 2.42 0.66 15.75 3.50 2.44 0.62 16.00 3.52 2.47 0.58 16.25 3.54 2.49 0.55 16.50 3.56 2.51 0.53 16.75 3.59 2.53 0.52 17.00 3.61 2.55 0.50 17.25 3.63 2.57 0.49 17.50 3.65 2.59 0.47 17.75 3.67 2.60 0.46 18.00 3.68 2.62 0.44 18.25 3.70 2.64 0.43 18.50 3.72 2.65 0.41 18.75 3.74 2.67 0.40 19.00 3.75 2.68 0.38 19.25 3.77 2.70 0.37 19.50 3.78 2.71 0.35 19.75 3.79 2.72 0.34 20.00 3.81 2.74 0.32 20.25 3.82 2.75 0.31 20.50 3.83 2.76 0.31 20.75 3.85 2.77 0.30 21.00 3.86 2.79 0.30 21.25 3.87 2.80 0.30 21.50 3.88 2.81 0.30 21.75 3.90 2.82 0.29 22.00 3.91 2.83 0.29 22.25 3.92 2.84 0.29 22.50 3.93 2.85 0.28 22.75 3.94 2.87 0.28 23.00 3.95 2.88 0.28 23.25 3.97 2.89 0.28 23.50 3.98 2.90 0.27 23.75 3.99 2.91 0.27 24.00 4.00 2.92 0.27 WPO Amendment Type 1124 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCADO 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 12 Summary for Pond 4P: 1A Inflow Area = 42.330 ac, 30.83% Impervious, Inflow Depth > 2.10" for 2 YR event Inflow = 114.45 cfs @ 12.07 hrs, Volume= 7.400 of Outflow = 34.98 cfs @ 12.33 hrs, Volume= 5.320 af, Atten= 69%, Lag= 15.6 min Primary = 34.98 cfs @ 12.33 hrs, Volume= 5.320 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 397.58'@ 12.33 hrs Surf.Area= 23,398 sf Storage= 137,362 cf Plug -Flow detention time= 166.2 min calculated for 5.309 of (72% of inflow) Center -of -Mass det. time= 68.5 min ( 898.5 - 830.0 ) Volume Invert Avail.Storage Storage Description #1 388.00' 405,270 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) 388.00 6,554 0 0 390.00 9,445 15,999 15,999 392.00 12,611 22,056 38,055 394.00 16,134 28,745 66,800 396.00 20,060 36,194 102,994 398.00 24,281 44,341 147,335 400.00 28,776 53,057 200,392 402.00 32,358 61,134 261,526 404.00 35,833 68,191 329,717 406.00 39,720 75,553 405,270 Device Routinq Invert Outlet Devices #1 Primary 388.00' 24.0" Round CMP Round 24" L= 80.0' CMP, projecting, no headwall, Ke= 0.900 Inlet/ Outlet Invert= 388.00'/383.95' S=0.0506'/' Cc= 0.900 n=0.025 Corrugated metal, Flow Area= 3.14 sf #2 Device 1 395.00' 24.0" Vert. Orifice/Grate X 2.00 C= 0.600 #3 Device 1 401.00' 12.6' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=34.97 cfs @ 12.33 hrs HW=397.58' (Free Discharge) L1=CMP_Round 24" (Inlet Controls 34.97 cfs @ 11.13 fps) L2=Orifice/Grate (Passes 34.97 cfs of 37.98 cfs potential flow) 3=Sharp-Crested Rectangular Weir( Controls 0.00 cfs) WPO Amendment Type// 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Paae 13 N V 3 0 LL d 0 0 0 m LU Pond 4P: 1A Hydrograph 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 4P: 1A Stage -Discharge 0 5 10 15 20 25 30 35 40 45 Discharge (cfs) `1 Inflow 7 Primary ❑ Primary 111 Crested Rectangular Weir WPO Amendment Type 1124 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 14 d m c 0 d LU Pond 4P: IA Stage -Area -Storage Surface/Horizontal/Wetted Area (sq -ft) 0 50,000 100,000 150,000 200,000 250,000 300,000 350,000 400,000 Storage (cubic -feet) Surface ❑ Storage WPO Amendment Type 11 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 15 Hydrograph for Pond 4P: 1A Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 388.00 0.00 0.50 0.00 0 388.00 0.00 1.00 0.00 0 388.00 0.00 1.50 0.00 0 388.00 0.00 2.00 0.00 0 388.00 0.00 2.50 0.00 0 388.00 0.00 3.00 0.00 0 388.00 0.00 3.50 0.00 0 388.00 0.00 4.00 0.00 0 388.00 0.00 4.50 0.00 0 388.00 0.00 5.00 0.01 6 388.00 0.00 5.50 0.03 45 388.01 0.00 6.00 0.06 128 388.02 0.00 6.50 0.09 258 388.04 0.00 7.00 0.11 438 388.07 0.00 7.50 0.14 670 388.10 0.00 8.00 0.18 958 388.14 0.00 8.50 0.23 1,314 388.20 0.00 9.00 0.40 1,844 388.27 0.00 9.50 0.68 2,825 388.41 0.00 10.00 1.04 4,323 388.62 0.00 10.50 1.73 6,759 388.93 0.00 11.00 2.96 10,858 389.43 0.00 11.50 5.86 18,353 390.24 0.00 12.00 96.19 69,839 394.19 0.00 12.50 19.87 131,965 397.35 34.42 13.00 9.52 108,929 396.29 16.60 13.50 7.05 101,529 395.93 9.34 14.00 5.54 98,521 395.77 6.77 14.50 4.72 96,783 395.69 5.42 15.00 4.27 95,802 395.63 4.71 15.50 3.82 95,083 395.60 4.19 16.00 3.36 94,428 395.56 3.72 16.50 3.06 93,804 395.53 3.36 17.00 2.90 93,363 395.51 3.11 17.50 2.74 93,020 395.49 2.92 18.00 2.57 92,710 395.47 2.74 18.50 2.41 92,409 395.46 2.57 19.00 2.24 92,111 395.44 2.41 19.50 2.07 91,811 395.43 2.24 20.00 1.90 91,510 395.41 2.07 20.50 1.81 91,241 395.40 1.92 21.00 1.77 91,093 395.39 1.83 21.50 1.74 91,003 395.38 1.78 22.00 1.71 90,934 395.38 1.74 22.50 1.68 90,863 395.38 1.72 23.00 1.64 90,784 395.37 1.69 23.50 1.61 90,701 395.37 1.66 24.00 1.58 90,615 395.36 1.63 WPO Amendment Type 11 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 16 Elevation Primary (feet) (Cfs) 388.00 0.00 388.20 0.00 388.40 0.00 388.60 0.00 388.80 0.00 389.00 0.00 389.20 0.00 389.40 0.00 389.60 0.00 389.80 0.00 390.00 0.00 390.20 0.00 390.40 0.00 390.60 0.00 390.80 0.00 391.00 0.00 391.20 0.00 391.40 0.00 391.60 0.00 391.80 0.00 392.00 0.00 392.20 0.00 392.40 0.00 392.60 0.00 392.80 0.00 393.00 0.00 393.20 0.00 393.40 0.00 393.60 0.00 393.80 0.00 394.00 0.00 394.20 0.00 394.40 0.00 394.60 0.00 394.80 0.00 395.00 0.00 395.20 0.50 395.40 1.93 395.60 4.18 395.80 7.15 396.00 10.70 396.20 14.68 396.40 18.93 396.60 23.21 396.80 27.21 397.00 30.25 397.20 33.14 397.40 34.61 397.60 35.02 397.80 35.43 398.00 35.83 398.20 36.22 Stage -Discharge for Pond 4P: 1A Elevation Primary (feet) (Cfs) 398.40 36.61 398.60 37.00 398.80 37.38 399.00 37.76 399.20 38.14 399.40 38.51 399.60 38.88 399.80 39.25 400.00 39.61 400.20 39.97 400.40 40.32 400.60 40.67 400.80 41.02 401.00 41.37 401.20 41.65 401.40 41.92 401.60 42.19 401.80 42.46 402.00 42.73 402.20 43.00 402.40 43.26 402.60 43.52 402.80 43.78 403.00 44.04 403.20 44.30 403.40 44.55 403.60 44.81 403.80 45.06 404.00 45.31 404.20 45.56 404.40 45.81 404.60 46.06 404.80 46.31 405.00 46.55 405.20 46.80 405.40 47.04 405.60 47.28 405.80 47.52 406.00 47.76 WPO Amendment Type 11 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD®10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 17 Stage -Area -Storage for Pond 4P: 1A Elevation Surface Storage (feet) (sq -ft) (cubic -feet) 388.00 6,554 0 388.20 6,843 1,340 388.40 7,132 2,737 388.60 7,421 4,193 388.80 7,710 5,706 389.00 8,000 7,277 389.20 8,289 8,906 389.40 8,578 10,592 389.60 8,867 12,337 389.80 9,156 14,139 390.00 9,445 15,999 390.20 9,762 17,920 390.40 10,078 19,904 390.60 10,395 21,951 390.80 10,711 24,062 391.00 11,028 26,236 391.20 11,345 28,473 391.40 11,661 30,773 391.60 11,978 33,137 391.80 12,294 35,564 392.00 12,611 38,055 392.20 12,963 40,612 392.40 13,316 43,240 392.60 13,668 45,939 392.80 14,020 48,707 393.00 14,373 51,547 393.20 14,725 54,456 393.40 15,077 57,437 393.60 15,429 60,487 393.80 15,782 63,608 394.00 16,134 66,800 394.20 16,527 70,066 394.40 16,919 73,411 394.60 17,312 76,834 394.80 17,704 80,335 395.00 18,097 83,916 395.20 18,490 87,574 395.40 18,882 91,311 395.60 19,275 95,127 395.80 19,667 99,021 396.00 20,060 102,994 396.20 20,482 107,048 396.40 20,904 111,187 396.60 21,326 115,410 396.80 21,748 119,717 397.00 22,171 124,109 397.20 22,593 128,586 397.40 23,015 133,146 397.60 23,437 137,791 397.80 23,859 142,521 398.00 24,281 147,335 398.20 24,730 152,236 Elevation Surface Storage (feet) (sq -ft) (cubic -feet) 398.40 25,180 157,227 398.60 25,630 162,308 398.80 26,079 167,479 399.00 26,529 172,740 399.20 26,978 178,090 399.40 27,427 183,531 399.60 27,877 189,061 399.80 28,327 194,682 400.00 28,776 200,392 400.20 29,134 206,183 400.40 29,492 212,046 400.60 29,851 217,980 400.80 30,209 223,986 401.00 30,567 230,064 401.20 30,925 236,213 401.40 31,283 242,434 401.60 31,642 248,726 401.80 32,000 255,090 402.00 32,358 261,526 402.20 32,705 268,032 402.40 33,053 274,608 402.60 33,401 281,254 402.80 33,748 287,968 403.00 34,096 294,753 403.20 34,443 301,607 403.40 34,790 308,530 403.60 35,138 315,523 403.80 35,486 322,585 404.00 35,833 329,717 404.20 36,222 336,922 404.40 36,610 344,206 404.60 36,999 351,567 404.80 37,388 359,005 405.00 37,777 366,522 405.20 38,165 374,116 405.40 38,554 381,788 405.60 38,943 389,537 405.80 39,331 397,365 406.00 39,720 405,270 WPO Amendment Type// 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 18 Summary for Link 5L: (new Link) Inflow Area = 42.330 ac, 30.83% Impervious, Inflow Depth > 1.51" for 2 YR event Inflow = 34.98 cfs @ 12.33 hrs, Volume= 5.320 of Primary = 34.98 cfs @ 12.33 hrs, Volume= 5.320 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: (new Link) Hydrograph 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) FE -1 W -. 10 Primary WPO Amendment Type// 24 -hr 2 YR Rainfall=4.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD®10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 19 Hydrograph for Link 5L: (new Link) Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.25 0.00 0.00 0.00 0.50 0.00 0.00 0.00 0.75 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.25 0.00 0.00 0.00 1.50 0.00 0.00 0.00 1.75 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.25 0.00 0.00 0.00 2.50 0.00 0.00 0.00 2.75 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.25 0.00 0.00 0.00 3.50 0.00 0.00 0.00 3.75 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.25 0.00 0.00 0.00 4.50 0.00 0.00 0.00 4.75 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.25 0.00 0.00 0.00 7.50 0.00 0.00 0.00 7.75 0.00 0.00 0.00 8.00 0.00 0.00 0.00 8.25 0.00 0.00 0.00 8.50 0.00 0.00 0.00 8.75 0.00 0.00 0.00 9.00 0.00 0.00 0.00 9.25 0.00 0.00 0.00 9.50 0.00 0.00 0.00 9.75 0.00 0.00 0.00 10.00 0.00 0.00 0.00 10.25 0.00 0.00 0.00 10.50 0.00 0.00 0.00 10.75 0.00 0.00 0.00 11.00 0.00 0.00 0.00 11.25 0.00 0.00 0.00 11.50 0.00 0.00 0.00 11.75 0.00 0.00 0.00 12.00 0.00 0.00 0.00 12.25 34.80 0.00 34.80 12.50 34.42 0.00 34.42 12.75 25.73 0.00 25.73 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 13.00 16.60 0.00 16.60 13.25 11.86 0.00 11.86 13.50 9.34 0.00 9.34 13.75 7.85 0.00 7.85 14.00 6.77 0.00 6.77 14.25 5.97 0.00 5.97 14.50 5.42 0.00 5.42 14.75 5.03 0.00 5.03 15.00 4.71 0.00 4.71 15.25 4.44 0.00 4.44 15.50 4.19 0.00 4.19 15.75 3.95 0.00 3.95 16.00 3.72 0.00 3.72 16.25 3.52 0.00 3.52 16.50 3.36 0.00 3.36 16.75 3.22 0.00 3.22 17.00 3.11 0.00 3.11 17.25 3.01 0.00 3.01 17.50 2.92 0.00 2.92 17.75 2.83 0.00 2.83 18.00 2.74 0.00 2.74 18.25 2.66 0.00 2.66 18.50 2.57 0.00 2.57 18.75 2.49 0.00 2.49 19.00 2.41 0.00 2.41 19.25 2.32 0.00 2.32 19.50 2.24 0.00 2.24 19.75 2.15 0.00 2.15 20.00 2.07 0.00 2.07 20.25 1.98 0.00 1.98 20.50 1.92 0.00 1.92 20.75 1.87 0.00 1.87 21.00 1.83 0.00 1.83 21.25 1.81 0.00 1.81 21.50 1.78 0.00 1.78 21.75 1.76 0.00 1.76 22.00 1.74 0.00 1.74 22.25 1.73 0.00 1.73 22.50 1.72 0.00 1.72 22.75 1.70 0.00 1.70 23.00 1.69 0.00 1.69 23.25 1.67 0.00 1.67 23.50 1.66 0.00 1.66 23.75 1.64 0.00 1.64 24.00 1.63 0.00 1.63 WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD010.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 20 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS, Weighted -CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre AA Runoff Area=35.400 ac 0.00% Impervious Runoff Depth>3.37" Tc=16.5 min CN=76 Runoff=146.75 cfs 9.932 of Subcatchment2S: Post 1A OFF Runoff Area=36.050 ac 24.72% Impervious Runoff Depth>3.67" Tc=14.8 min CN=79 Runoff= 170.65 cfs 11.018 of Subcatchment3S: Post 1A ON Runoff Area=6.280 ac 65.92% Impervious Runoff Depth>4.83" Tc=14.8 min CN=90 Runoff=37.32 cfs 2.529 of Pond 4P: 1A Peak Elev=402.25' Storage=269,691 cf Inflow=207.95 cfs 13.547 of Outflow=43.06 cfs 11.423 of Link 5L: (new Link) Inflow=43.06 cfs 11.423 of Primary=43.06 cfs 11.423 of Total Runoff Area = 77.730 ac Runoff Volume = 23.480 of Average Runoff Depth = 3.62" 83.21 % Pervious = 64.680 ac 16.79% Impervious = 13.050 ac WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 1S: Pre -1A Runoff = 146.75 cfs @ 12.09 hrs, Volume= 9.932 af, Depth> 3.37' Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 YR Rainfall=6.00" Area (ac) CN Description 35.400 76 35.400 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 Direct Entry, Subcatchment 1S: Pre -1A Hydrograph 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Runoffill WPO Amendment Type // 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 22 Hydrograph for Subcatchment 1S: Pre -1A Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.25 0.02 0.00 0.00 0.50 0.03 0.00 0.00 0.75 0.05 0.00 0.00 1.00 0.06 0.00 0.00 1.25 0.08 0.00 0.00 1.50 0.10 0.00 0.00 1.75 0.11 0.00 0.00 2.00 0.13 0.00 0.00 2.25 0.15 0.00 0.00 2.50 0.17 0.00 0.00 2.75 0.19 0.00 0.00 3.00 0.21 0.00 0.00 3.25 0.23 0.00 0.00 3.50 0.25 0.00 0.00 3.75 0.27 0.00 0.00 4.00 0.29 0.00 0.00 4.25 0.31 0.00 0.00 4.50 0.33 0.00 0.00 4.75 0.35 0.00 0.00 5.00 0.38 0.00 0.00 5.25 0.40 0.00 0.00 5.50 0.43 0.00 0.00 5.75 0.45 0.00 0.00 6.00 0.48 0.00 0.00 6.25 0.51 0.00 0.00 6.50 0.54 0.00 0.00 6.75 0.56 0.00 0.00 7.00 0.59 0.00 0.00 7.25 0.62 0.00 0.00 7.50 0.66 0.00 0.01 7.75 0.69 0.00 0.07 8.00 0.72 0.00 0.16 8.25 0.75 0.00 0.26 8.50 0.79 0.01 0.39 8.75 0.84 0.01 0.55 9.00 0.88 0.02 0.74 9.25 0.93 0.03 0.95 9.50 0.98 0.03 1.13 9.75 1.03 0.04 1.31 10.00 1.09 0.06 1.63 10.25 1.15 0.07 2.04 10.50 1.22 0.09 2.58 10.75 1.31 0.12 3.28 11.00 1.41 0.15 4.28 11.25 1.54 0.20 5.69 11.50 1.70 0.27 8.16 11.75 2.32 0.59 21.85 12.00 3.98 1.72 115.82 12.25 4.24 1.92 79.49 12.50 4.41 2.06 29.27 12.75 4.53 2.15 16.69 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.00 4.63 2.24 12.85 13.25 4.72 2.31 10.75 13.50 4.79 2.37 9.41 13.75 4.86 2.42 8.28 14.00 4.92 2.47 7.37 14.25 4.97 2.51 6.61 14.50 5.03 2.56 6.23 14.75 5.07 2.60 5.93 15.00 5.12 2.64 5.63 15.25 5.16 2.67 5.34 15.50 5.21 2.71 5.04 15.75 5.24 2.74 4.73 16.00 5.28 2.77 4.43 16.25 5.31 2.80 4.16 16.50 5.35 2.82 4.02 16.75 5.38 2.85 3.91 17.00 5.41 2.88 3.80 17.25 5.44 2.90 3.70 17.50 5.47 2.93 3.59 17.75 5.50 2.95 3.48 18.00 5.53 2.97 3.37 18.25 5.55 3.00 3.26 18.50 5.58 3.02 3.15 18.75 5.60 3.04 3.04 19.00 5.63 3.06 2.93 19.25 5.65 3.08 2.82 19.50 5.67 3.10 2.71 19.75 5.69 3.12 2.60 20.00 5.71 3.13 2.49 20.25 5.73 3.15 2.39 20.50 5.75 3.17 2.36 20.75 5.77 3.18 2.33 21.00 5.79 3.20 2.31 21.25 5.81 3.21 2.29 21.50 5.83 3.23 2.27 21.75 5.84 3.25 2.25 22.00 5.86 3.26 2.23 22.25 5.88 3.28 2.21 22.50 5.90 3.29 2.18 22.75 5.92 3.31 2.16 23.00 5.93 3.32 2.14 23.25 5.95 3.34 2.12 23.50 5.97 3.35 2.10 23.75 5.98 3.37 2.08 24.00 6.00 3.38 2.05 WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCADO 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 2S: Post 1A OFF Runoff = 170.65 cfs @ 12.07 hrs, Volume= 11.018 af, Depth> 3.67' Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 YR Rainfall=6.00" Area (ac) CN Description 8.910 98 24.540 74 0.390 91 0.210 88 2.000 61 36.050 79 Weighted Average 27.140 75.28% Pervious Area 8.910 24.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.8 Direct Entry, Subcatchment 2S: Post 1A OFF Hydrograph U 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Runoff WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 24 Hydrograph for Subcatchment 2S: Post 1A OFF Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.25 0.02 0.00 0.00 0.50 0.03 0.00 0.00 0.75 0.05 0.00 0.00 1.00 0.06 0.00 0.00 1.25 0.08 0.00 0.00 1.50 0.10 0.00 0.00 1.75 0.11 0.00 0.00 2.00 0.13 0.00 0.00 2.25 0.15 0.00 0.00 2.50 0.17 0.00 0.00 2.75 0.19 0.00 0.00 3.00 0.21 0.00 0.00 3.25 0.23 0.00 0.00 3.50 0.25 0.00 0.00 3.75 0.27 0.00 0.00 4.00 0.29 0.00 0.00 4.25 0.31 0.00 0.00 4.50 0.33 0.00 0.00 4.75 0.35 0.00 0.00 5.00 0.38 0.00 0.00 5.25 0.40 0.00 0.00 5.50 0.43 0.00 0.00 5.75 0.45 0.00 0.00 6.00 0.48 0.00 0.00 6.25 0.51 0.00 0.00 6.50 0.54 0.00 0.00 6.75 0.56 0.00 0.03 7.00 0.59 0.00 0.11 7.25 0.62 0.00 0.21 7.50 0.66 0.01 0.31 7.75 0.69 0.01 0.41 8.00 0.72 0.01 0.51 8.25 0.75 0.02 0.64 8.50 0.79 0.02 0.82 8.75 0.84 0.03 1.03 9.00 0.88 0.04 1.28 9.25 0.93 0.05 1.53 9.50 0.98 0.06 1.71 9.75 1.03 0.08 1.93 10.00 1.09 0.10 2.33 10.25 1.15 0.12 2.83 10.50 1.22 0.14 3.50 10.75 1.31 0.18 4.36 11.00 1.41 0.22 5.56 11.25 1.54 0.28 7.29 11.50 1.70 0.36 10.26 11.75 2.32 0.72 29.45 12.00 3.98 1.95 146.02 12.25 4.24 2.16 74.68 12.50 4.41 2.30 28.40 12.75 4.53 2.40 16.79 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.00 4.63 2.49 13.44 13.25 4.72 2.56 11.29 13.50 4.79 2.63 9.90 13.75 4.86 2.68 8.71 14.00 4.92 2.73 7.76 14.25 4.97 2.78 6.98 14.50 5.03 2.82 6.59 14.75 5.07 2.87 6.27 15.00 5.12 2.91 5.95 15.25 5.16 2.94 5.64 15.50 5.21 2.98 5.31 15.75 5.24 3.01 4.99 16.00 5.28 3.04 4.67 16.25 5.31 3.07 4.39 16.50 5.35 3.10 4.25 16.75 5.38 3.13 4.13 17.00 5.41 3.16 4.02 17.25 5.44 3.18 3.90 17.50 5.47 3.21 3.79 17.75 5.50 3.24 3.67 18.00 5.53 3.26 3.56 18.25 5.55 3.28 3.44 18.50 5.58 3.31 3.33 18.75 5.60 3.33 3.21 19.00 5.63 3.35 3.09 19.25 5.65 3.37 2.97 19.50 5.67 3.39 2.86 19.75 5.69 3.41 2.74 20.00 5.71 3.42 2.62 20.25 5.73 3.44 2.52 20.50 5.75 3.46 2.49 20.75 5.77 3.47 2.46 21.00 5.79 3.49 2.44 21.25 5.81 3.51 2.42 21.50 5.83 3.52 2.39 21.75 5.84 3.54 2.37 22.00 5.86 3.56 2.35 22.25 5.88 3.57 2.33 22.50 5.90 3.59 2.30 22.75 5.92 3.60 2.28 23.00 5.93 3.62 2.26 23.25 5.95 3.63 2.23 23.50 5.97 3.65 2.21 23.75 5.98 3.66 2.19 24.00 6.00 3.68 2.16 WPO Amendment Type// 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 3S: Post 1A ON Runoff = 37.32 cfs @ 12.06 hrs, Volume= 2.529 af, Depth> 4.83" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 YR Rainfall=6.00" Area (ac) CN Description 3.660 98 2.140 74 0.480 98 6.280 90 Weighted Average 2.140 34.08% Pervious Area 4.140 65.92% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.8 Direct Entry, 3 0 LL Subcatchment 3S: Post 1A ON Hydrograph 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) I LJ Runoff WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 26 Hydrograph for Subcatchment 3S: Post 1A ON Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.25 0.02 0.00 0.00 0.50 0.03 0.00 0.00 0.75 0.05 0.00 0.00 1.00 0.06 0.00 0.00 1.25 0.08 0.00 0.00 1.50 0.10 0.00 0.00 1.75 0.11 0.00 0.00 2.00 0.13 0.00 0.00 2.25 0.15 0.00 0.00 2.50 0.17 0.00 0.00 2.75 0.19 0.00 0.00 3.00 0.21 0.00 0.00 3.25 0.23 0.00 0.00 3.50 0.25 0.00 0.01 3.75 0.27 0.00 0.02 4.00 0.29 0.00 0.04 4.25 0.31 0.01 0.06 4.50 0.33 0.01 0.08 4.75 0.35 0.01 0.10 5.00 0.38 0.02 0.12 5.25 0.40 0.03 0.14 5.50 0.43 0.03 0.16 5.75 0.45 0.04 0.19 6.00 0.48 0.05 0.21 6.25 0.51 0.06 0.24 6.50 0.54 0.07 0.26 6.75 0.56 0.08 0.28 7.00 0.59 0.09 0.31 7.25 0.62 0.11 0.34 7.50 0.66 0.12 0.36 7.75 0.69 0.14 0.39 8.00 0.72 0.15 0.41 8.25 0.75 0.17 0.45 8.50 0.79 0.19 0.51 8.75 0.84 0.22 0.59 9.00 0.88 0.25 0.66 9.25 0.93 0.28 0.73 9.50 0.98 0.31 0.76 9.75 1.03 0.34 0.81 10.00 1.09 0.38 0.92 10.25 1.15 0.42 1.06 10.50 1.22 0.47 1.25 10.75 1.31 0.54 1.47 11.00 1.41 0.61 1.78 11.25 1.54 0.71 2.22 11.50 1.70 0.84 2.96 11.75 2.32 1.37 7.80 12.00 3.98 2.90 32.92 12.25 4.24 3.14 15.69 12.50 4.41 3.31 5.76 12.75 4.53 3.43 3.35 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.00 4.63 3.52 2.67 13.25 4.72 3.61 2.23 13.50 4.79 3.68 1.95 13.75 4.86 3.74 1.71 14.00 4.92 3.80 1.52 14.25 4.97 3.85 1.36 14.50 5.03 3.90 1.29 14.75 5.07 3.95 1.22 15.00 5.12 3.99 1.16 15.25 5.16 4.04 1.10 15.50 5.21 4.07 1.03 15.75 5.24 4.11 0.97 16.00 5.28 4.15 0.90 16.25 5.31 4.18 0.85 16.50 5.35 4.21 0.82 16.75 5.38 4.24 0.80 17.00 5.41 4.27 0.78 17.25 5.44 4.30 0.75 17.50 5.47 4.33 0.73 17.75 5.50 4.36 0.71 18.00 5.53 4.39 0.68 18.25 5.55 4.41 0.66 18.50 5.58 4.44 0.64 18.75 5.60 4.46 0.62 19.00 5.63 4.48 0.59 19.25 5.65 4.50 0.57 19.50 5.67 4.53 0.55 19.75 5.69 4.55 0.52 20.00 5.71 4.57 0.50 20.25 5.73 4.58 0.48 20.50 5.75 4.60 0.48 20.75 5.77 4.62 0.47 21.00 5.79 4.64 0.47 21.25 5.81 4.66 0.46 21.50 5.83 4.68 0.46 21.75 5.84 4.69 0.45 22.00 5.86 4.71 0.45 22.25 5.88 4.73 0.44 22.50 5.90 4.75 0.44 22.75 5.92 4.76 0.43 23.00 5.93 4.78 0.43 23.25 5.95 4.80 0.43 23.50 5.97 4.81 0.42 23.75 5.98 4.83 0.42 24.00 6.00 4.85 0.41 WPO Amendment Type 1124 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 27 Summary for Pond 4P: 1A Inflow Area = 42.330 ac, 30.83% Impervious, Inflow Depth > 3.84" for 10 YR event Inflow = 207.95 cfs @ 12.07 hrs, Volume= 13.547 of Outflow = 43.06 cfs @ 12.42 hrs, Volume= 11.423 af, Atten= 79%, Lag= 21.4 min Primary = 43.06 cfs @ 12.42 hrs, Volume= 11.423 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 402.25'@ 12.42 hrs Surf.Area= 32,794 sf Storage= 269,691 cf Plug -Flow detention time= 133.7 min calculated for 11.400 of (84% of inflow) Center -of -Mass det. time= 65.3 min ( 879.0 - 813.7 ) Volume Invert Avail.Storage Storage Description #1 388.00' 405,270 cf Custom Stage Data (Prismatic)-isted below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) 388.00 6,554 0 0 390.00 9,445 15,999 15,999 392.00 12,611 22,056 38,055 394.00 16,134 28,745 66,800 396.00 20,060 36,194 102,994 398.00 24,281 44,341 147,335 400.00 28,776 53,057 200,392 402.00 32,358 61,134 261,526 404.00 35,833 68,191 329,717 406.00 39,720 75,553 405,270 Device Routing Invert Outlet Devices #1 Primary 388.00' 24.0" Round CMP -Round 24" L= 80.0' CMP, projecting, no headwall, Ke= 0.900 Inlet/ Outlet Invert= 388.00'/ 383.95' S= 0.0506 T Cc= 0.900 n=0.025 Corrugated metal, Flow Area= 3.14 sf #2 Device 1 395.00' 24.0" Vert. Orifice/Grate X 2.00 C= 0.600 #3 Device 1 401.00' 12.6' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=43.05 cfs @ 12.42 hrs HW=402.25' (Free Discharge) L1=CMP_Round 24" (Barrel Controls 43.05 cfs @ 13.70 fps) �__2=0rifice/Grate (Passes < 75.60 cfs potential flow) 3=Sharp-Crested Rectangular Weir(Passes < 56.12 cfs potential flow) WPO Amendment Type// 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCADO 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 28 Pond 4P: 1A Hydrograph 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 4P: 1A Stage -Discharge ■ Inflow ■ Primary 0 5 0 15 20 25 30 35 40 45 Discharge (cfs) WPO Amendment Type 1124 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 29 w Pond 4P: 1A Stage -Area -Storage SurfacelHorizonta 'ted Area /sq -ft) 5.000 10.000 15.000 20.000 25.000 30.000 35.000 0 50,000 100,000 150,000 200,000 250,000 300,000 350,000 400,000 Storage (cubic -feet) Surface I El Storage WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 30 Hydrograph for Pond 4P: 1A Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 388.00 0.00 0.50 0.00 0 388.00 0.00 1.00 0.00 0 388.00 0.00 1.50 0.00 0 388.00 0.00 2.00 0.00 0 388.00 0.00 2.50 0.00 0 388.00 0.00 3.00 0.00 0 388.00 0.00 3.50 0.01 2 388.00 0.00 4.00 0.04 45 388.01 0.00 4.50 0.08 152 388.02 0.00 5.00 0.12 331 388.05 0.00 5.50 0.16 588 388.09 0.00 6.00 0.21 926 388.14 0.00 6.50 0.26 1,350 388.20 0.00 7.00 0.42 1,931 388.28 0.00 7.50 0.67 2,907 388.42 0.00 8.00 0.93 4,340 388.62 0.00 8.50 1.33 6,322 388.88 0.00 9.00 1.94 9,244 389.24 0.00 9.50 2.48 13,279 389.70 0.00 10.00 3.25 18,291 390.24 0.00 10.50 4.75 25,368 390.92 0.00 11.00 7.35 36,004 391.84 0.00 11.50 13.22 53,629 393.14 0.00 12.00 178.95 144,841 397.90 35.62 12.50 34.16 268,313 402.21 43.01 13.00 16.11 231,581 401.05 41.44 13.50 11.85 184,124 399.42 38.55 14.00 9.28 136,733 397.55 34.93 14.50 7.88 107,048 396.20 14.70 15.00 7.11 100,836 395.89 8.74 15.50 6.35 98,900 395.79 7.09 16.00 5.57 97,772 395.74 6.14 16.50 5.07 96,848 395.69 5.47 17.00 4.80 96,278 395.66 5.06 17.50 4.52 95,846 395.64 4.75 18.00 4.24 95,451 395.62 4.46 18.50 3.96 95,063 395.60 4.18 19.00 3.68 94,676 395.58 3.90 19.50 3.40 94,285 395.56 3.63 20.00 3.12 93,842 395.53 3.38 20.50 2.96 93,417 395.51 3.14 21.00 2.91 93,177 395.50 3.01 21.50 2.85 93,028 395.49 2.92 22.00 2.80 92,912 395.48 2.86 22.50 2.74 92,807 395.48 2.80 23.00 2.69 92,707 395.47 2.74 23.50 2.63 92,608 395.47 2.69 24.00 2.57 92,509 395.46 2.63 WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCADO 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 31 Elevation Primary (feet) (Cfs) 388.00 0.00 388.20 0.00 388.40 0.00 388.60 0.00 388.80 0.00 389.00 0.00 389.20 0.00 389.40 0.00 389.60 0.00 389.80 0.00 390.00 0.00 390.20 0.00 390.40 0.00 390.60 0.00 390.80 0.00 391.00 0.00 391.20 0.00 391.40 0.00 391.60 0.00 391.80 0.00 392.00 0.00 392.20 0.00 392.40 0.00 392.60 0.00 392.80 0.00 393.00 0.00 393.20 0.00 393.40 0.00 393.60 0.00 393.80 0.00 394.00 0.00 394.20 0.00 394.40 0.00 394.60 0.00 394.80 0.00 395.00 0.00 395.20 0.50 395.40 1.93 395.60 4.18 395.80 7.15 396.00 10.70 396.20 14.68 396.40 18.93 396.60 23.21 396.80 27.21 397.00 30.25 397.20 33.14 397.40 34.61 397.60 35.02 397.80 35.43 398.00 35.83 398.20 36.22 Stage -Discharge for Pond 4P: 1A Elevation Primary (feet) (Cfs) 398.40 36.61 398.60 37.00 398.80 37.38 399.00 37.76 399.20 38.14 399.40 38.51 399.60 38.88 399.80 39.25 400.00 39.61 400.20 39.97 400.40 40.32 400.60 40.67 400.80 41.02 401.00 41.37 401.20 41.65 401.40 41.92 401.60 42.19 401.80 42.46 402.00 42.73 402.20 43.00 402.40 43.26 402.60 43.52 402.80 43.78 403.00 44.04 403.20 44.30 403.40 44.55 403.60 44.81 403.80 45.06 404.00 45.31 404.20 45.56 404.40 45.81 404.60 46.06 404.80 46.31 405.00 46.55 405.20 46.80 405.40 47.04 405.60 47.28 405.80 47.52 406.00 47.76 WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 32 Stage -Area -Storage for Pond 4P: 1A Elevation Surface Storage (feet) (sq -ft) (cubic -feet) 388.00 6,554 0 388.20 6,843 1,340 388.40 7,132 2,737 388.60 7,421 4,193 388.80 7,710 5,706 389.00 8,000 7,277 389.20 8,289 8,906 389.40 8,578 10,592 389.60 8,867 12,337 389.80 9,156 14,139 390.00 9,445 15,999 390.20 9,762 17,920 390.40 10,078 19,904 390.60 10,395 21,951 390.80 10,711 24,062 391.00 11,028 26,236 391.20 11,345 28,473 391.40 11,661 30,773 391.60 11,978 33,137 391.80 12,294 35,564 392.00 12,611 38,055 392.20 12,963 40,612 392.40 13,316 43,240 392.60 13,668 45,939 392.80 14,020 48,707 393.00 14,373 51,547 393.20 14,725 54,456 393.40 15,077 57,437 393.60 15,429 60,487 393.80 15,782 63,608 394.00 16,134 66,800 394.20 16,527 70,066 394.40 16,919 73,411 394.60 17,312 76,834 394.80 17,704 80,335 395.00 18,097 83,916 395.20 18,490 87,574 395.40 18,882 91,311 395.60 19,275 95,127 395.80 19,667 99,021 396.00 20,060 102,994 396.20 20,482 107,048 396.40 20,904 111,187 396.60 21,326 115,410 396.80 21,748 119,717 397.00 22,171 124,109 397.20 22,593 128,586 397.40 23,015 133,146 397.60 23,437 137,791 397.80 23,859 142,521 398.00 24,281 147,335 398.20 24,730 152,236 Elevation Surface Storage (feet) (sq -ft) (cubic -feet) 398.40 25,180 157,227 398.60 25,630 162,308 398.80 26,079 167,479 399.00 26,529 172,740 399.20 26,978 178,090 399.40 27,427 183,531 399.60 27,877 189,061 399.80 28,327 194,682 400.00 28,776 200,392 400.20 29,134 206,183 400.40 29,492 212,046 400.60 29,851 217,980 400.80 30,209 223,986 401.00 30,567 230,064 401.20 30,925 236,213 401.40 31,283 242,434 401.60 31,642 248,726 401.80 32,000 255,090 402.00 32,358 261,526 402.20 32,705 268,032 402.40 33,053 274,608 402.60 33,401 281,254 402.80 33,748 287,968 403.00 34,096 294,753 403.20 34,443 301,607 403.40 34,790 308,530 403.60 35,138 315,523 403.80 35,486 322,585 404.00 35,833 329,717 404.20 36,222 336,922 404.40 36,610 344,206 404.60 36,999 351,567 404.80 37,388 359,005 405.00 37,777 366,522 405.20 38,165 374,116 405.40 38,554 381,788 405.60 38,943 389,537 405.80 39,331 397,365 406.00 39,720 405,270 WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 © 2015 HydroCAD Software Solutions LLC Page 33 Summary for Link 5L: (new Link) Inflow Area = 42.330 ac, 30.83% Impervious, Inflow Depth > 3.24" for 10 YR event Inflow = 43.06 cfs @ 12.42 hrs, Volume= 11.423 of Primary = 43.06 cfs @ 12.42 hrs, Volume= 11.423 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs 48 46 44 42 40 38 36 34 32 30 w 28 v 26 3 24 0 22 LL 20 18 16 14 12 10 8 6 4 2 0 0 Link 5L: (new Link) Hydrograph 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ® Inflow ❑ Primary WPO Amendment Type 11 24 -hr 10 YR Rainfall=6.00" Prepared by Timmons Group Printed 7/12/2018 HydroCAD® 10.00-16 s/n 06538 @2015 HydroCAD Software Solutions LLC Page 34 Hydrograph for Link 5L: (new Link) Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.25 0.00 0.00 0.00 0.50 0.00 0.00 0.00 0.75 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.25 0.00 0.00 0.00 1.50 0.00 0.00 0.00 1.75 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.25 0.00 0.00 0.00 2.50 0.00 0.00 0.00 2.75 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.25 0.00 0.00 0.00 3.50 0.00 0.00 0.00 3.75 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.25 0.00 0.00 0.00 4.50 0.00 0.00 0.00 4.75 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.25 0.00 0.00 0.00 7.50 0.00 0.00 0.00 7.75 0.00 0.00 0.00 8.00 0.00 0.00 0.00 8.25 0.00 0.00 0.00 8.50 0.00 0.00 0.00 8.75 0.00 0.00 0.00 9.00 0.00 0.00 0.00 9.25 0.00 0.00 0.00 9.50 0.00 0.00 0.00 9.75 0.00 0.00 0.00 10.00 0.00 0.00 0.00 10.25 0.00 0.00 0.00 10.50 0.00 0.00 0.00 10.75 0.00 0.00 0.00 11.00 0.00 0.00 0.00 11.25 0.00 0.00 0.00 11.50 0.00 0.00 0.00 11.75 0.00 0.00 0.00 12.00 35.62 0.00 35.62 12.25 42.59 0.00 42.59 12.50 43.01 0.00 43.01 12.75 42.38 0.00 42.38 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 13.00 41.44 0.00 41.44 13.25 40.08 0.00 40.08 13.50 38.55 0.00 38.55 13.75 36.84 0.00 36.84 14.00 34.93 0.00 34.93 14.25 24.58 0.00 24.58 14.50 14.70 0.00 14.70 14.75 10.56 0.00 10.56 15.00 8.74 0.00 8.74 15.25 7.75 0.00 7.75 15.50 7.09 0.00 7.09 15.75 6.57 0.00 6.57 16.00 6.14 0.00 6.14 16.25 5.77 0.00 5.77 16.50 5.47 0.00 5.47 16.75 5.24 0.00 5.24 17.00 5.06 0.00 5.06 17.25 4.90 0.00 4.90 17.50 4.75 0.00 4.75 17.75 4.60 0.00 4.60 18.00 4.46 0.00 4.46 18.25 4.32 0.00 4.32 18.50 4.18 0.00 4.18 18.75 4.04 0.00 4.04 19.00 3.90 0.00 3.90 19.25 3.76 0.00 3.76 19.50 3.63 0.00 3.63 19.75 3.51 0.00 3.51 20.00 3.38 0.00 3.38 20.25 3.25 0.00 3.25 20.50 3.14 0.00 3.14 20.75 3.06 0.00 3.06 21.00 3.01 0.00 3.01 21.25 2.96 0.00 2.96 21.50 2.92 0.00 2.92 21.75 2.89 0.00 2.89 22.00 2.86 0.00 2.86 22.25 2.83 0.00 2.83 22.50 2.80 0.00 2.80 22.75 2.77 0.00 2.77 23.00 2.74 0.00 2.74 23.25 2.71 0.00 2.71 23.50 2.69 0.00 2.69 23.75 2.66 0.00 2.66 24.00 2.63 0.00 2.63