Drainage Report

.54 4.98 0.00 51.00 5.22 2.54 4.98 0.00 52.50 5.22 2.54 4.98 0.00 54.00 5.22 2.54 4.98 0.00 55.50 5.22 2.54 4.98 0.00 57.00 5.22 2.54 4.98 0.00 58.50 5.22 2.54 4.98 0.00 60.00 5.22 2.54 4.98 0.00 61.50 5.22 2.54 4.98 0.00 63.00 5.22 2.54 4.98 0.00 64.50 5.22 2.54 4.98 0.00 66.00 5.22 2.54 4.98 0.00 67.50 5.22 2.54 4.98 0.00 69.00 5.22 2.54 4.98 0.00 70.50 5.22 2.54 4.98 0.00 72.00 5.22 2.54 4.98 0.00

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 25S: overland 5-A [47] Hint: Peak is 141% of capacity of segment #4 Runoff = 5.38 cfs @ 12.15 hrs, Volume= 0.437 af, Depth= 3.33" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.03 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) CN Description 22,200 98 Paved parking, HSG C 46,435 74 >75% Grass cover, Good, HSG C 68,635 82 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.7 100 0.1200 0.25 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 0.1 20 0.0500 3.35 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.4 118 0.0550 4.76 Shallow Concentrated Flow, gutter flow Paved Kv= 20.3 fps 0.4 156 0.0349 6.80 3.82 Pipe Channel, 15.0" Round w/ 8.0" inside fill Area= 0.6 sf Perim= 3.1' r= 0.18' n= 0.013 Corrugated PE, smooth interior 7.6 394 Total

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 24 Subcatchment 25S: overland 5-A Hydrograph 6 Runoff 5.38 cfs NOAA 24-hr D 5 10-Year Rainfall=5.22" Runoff Area=68,635 sf 4 Runoff Volume=0.437 af Flow (cfs) 3 Runoff Depth=3.33" Flow Length=394' 2 Tc=7.6 min CN=74/98 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 25 Hydrograph for Subcatchment 25S: overland 5-A Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 1.50 0.09 0.00 0.01 0.01 3.00 0.20 0.00 0.07 0.03 4.50 0.31 0.00 0.16 0.03 6.00 0.45 0.00 0.27 0.04 7.50 0.61 0.00 0.42 0.06 9.00 0.83 0.00 0.63 0.09 10.50 1.17 0.05 0.96 0.20 12.00 2.50 0.61 2.27 2.57 13.50 4.05 1.63 3.82 0.44 15.00 4.39 1.89 4.16 0.23 16.50 4.61 2.06 4.37 0.18 18.00 4.77 2.19 4.54 0.13 19.50 4.91 2.29 4.67 0.11 21.00 5.02 2.38 4.79 0.10 22.50 5.13 2.47 4.89 0.09 24.00 5.22 2.54 4.98 0.08 25.50 5.22 2.54 4.98 0.00 27.00 5.22 2.54 4.98 0.00 28.50 5.22 2.54 4.98 0.00 30.00 5.22 2.54 4.98 0.00 31.50 5.22 2.54 4.98 0.00 33.00 5.22 2.54 4.98 0.00 34.50 5.22 2.54 4.98 0.00 36.00 5.22 2.54 4.98 0.00 37.50 5.22 2.54 4.98 0.00 39.00 5.22 2.54 4.98 0.00 40.50 5.22 2.54 4.98 0.00 42.00 5.22 2.54 4.98 0.00 43.50 5.22 2.54 4.98 0.00 45.00 5.22 2.54 4.98 0.00 46.50 5.22 2.54 4.98 0.00 48.00 5.22 2.54 4.98 0.00 49.50 5.22 2.54 4.98 0.00 51.00 5.22 2.54 4.98 0.00 52.50 5.22 2.54 4.98 0.00 54.00 5.22 2.54 4.98 0.00 55.50 5.22

2.54 4.98 0.00 51.00 5.22 2.54 4.98 0.00 52.50 5.22 2.54 4.98 0.00 54.00 5.22 2.54 4.98 0.00 55.50 5.22 2.54 4.98 0.00 57.00 5.22 2.54 4.98 0.00 58.50 5.22 2.54 4.98 0.00 60.00 5.22 2.54 4.98 0.00 61.50 5.22 2.54 4.98 0.00 63.00 5.22 2.54 4.98 0.00 64.50 5.22 2.54 4.98 0.00 66.00 5.22 2.54 4.98 0.00 67.50 5.22 2.54 4.98 0.00 69.00 5.22 2.54 4.98 0.00 70.50 5.22 2.54 4.98 0.00 72.00 5.22 2.54 4.98 0.00

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment 26S: pre-dev basin 5 Runoff = 8.02 cfs @ 12.20 hrs, Volume= 0.706 af, Depth= 2.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.03 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) CN Description 167,719 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.1200 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 1.4 174 0.1670 2.04 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.5 274 Total Subcatchment 26S: pre-dev basin 5 Hydrograph Runoff 8.02 cfs 8 NOAA 24-hr D 7 10-Year Rainfall=5.22" 6 Runoff Area=167,719 sf Runoff Volume=0.706 af Flow (cfs) 5 Runoff Depth=2.20" 4

noff Volume=0.706 af Flow (cfs) 5 Runoff Depth=2.20" 4 Flow Length=274' 3 Tc=11.5 min CN=70/0 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 27 Hydrograph for Subcatchment 26S: pre-dev basin 5 Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 1.50 0.09 0.00 0.00 0.00 3.00 0.20 0.00 0.00 0.00 4.50 0.31 0.00 0.00 0.00 6.00 0.45 0.00 0.00 0.00 7.50 0.61 0.00 0.00 0.00 9.00 0.83 0.00 0.00 0.00 10.50 1.17 0.02 0.00 0.12 12.00 2.50 0.46 0.00 2.92 13.50 4.05 1.36 0.00 0.92 15.00 4.39 1.60 0.00 0.49 16.50 4.61 1.75 0.00 0.37 18.00 4.77 1.87 0.00 0.27 19.50 4.91 1.97 0.00 0.24 21.00 5.02 2.05 0.00 0.22 22.50 5.13 2.13 0.00 0.19 24.00 5.22 2.20 0.00 0.17 25.50 5.22 2.20 0.00 0.00 27.00 5.22 2.20 0.00 0.00 28.50 5.22 2.20 0.00 0.00 30.00 5.22 2.20 0.00 0.00 31.50 5.22 2.20 0.00 0.00 33.00 5.22 2.20 0.00 0.00 34.50 5.22 2.20 0.00 0.00 36.00 5.22 2.20 0.00 0.00 37.50 5.22 2.20 0.00 0.00 39.00 5.22 2.20 0.00 0.00 40.50 5.22 2.20 0.00 0.00 42.00 5.22 2.20 0.00 0.00 43.50 5.22 2.20 0.00 0.00 45.00 5.22 2.20 0.00 0.00 46.50 5.22 2.20 0.00 0.00 48.00 5.22 2.20 0.00 0.00 49.50 5.22 2.20 0.00 0.00 51.00 5.22 2.20 0.00 0.00 52.50 5.22 2.20 0.00 0.00 54.00 5.22 2.20 0.00 0.00 55.50 5.22

2.20 0.00 0.00 51.00 5.22 2.20 0.00 0.00 52.50 5.22 2.20 0.00 0.00 54.00 5.22 2.20 0.00 0.00 55.50 5.22 2.20 0.00 0.00 57.00 5.22 2.20 0.00 0.00 58.50 5.22 2.20 0.00 0.00 60.00 5.22 2.20 0.00 0.00 61.50 5.22 2.20 0.00 0.00 63.00 5.22 2.20 0.00 0.00 64.50 5.22 2.20 0.00 0.00 66.00 5.22 2.20 0.00 0.00 67.50 5.22 2.20 0.00 0.00 69.00 5.22 2.20 0.00 0.00 70.50 5.22 2.20 0.00 0.00 72.00 5.22 2.20 0.00 0.00

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 28 Summary for Pond 24P: Infiltration basin 5 Inflow Area = 2.275 ac, Inflow Depth = 4.08" for 10-Year event Inflow = 8.00 cfs @ 12.19 hrs, Volume= 0.773 af Outflow = 0.35 cfs @ 15.15 hrs, Volume= 0.231 af, Atten= 96%, Lag= 177.6 min Primary = 0.35 cfs @ 15.15 hrs, Volume= 0.231 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.03 hrs Peak Elev= 572.57' @ 15.15 hrs Surf.Area= 12,410 sf Storage= 25,739 cf Plug-Flow detention time= 580.4 min calculated for 0.231 af (30% of inflow) Center-of-Mass det. time= 376.7 min ( 1,152.6 - 775.9 ) Volume Invert Avail.Storage Storage Description #1 570.50' 43,435 cf Custom Stage Data (Conic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 570.50 12,410 0 0 12,410 574.00 12,410 43,435 43,435 13,792 Device Routing Invert Outlet Devices #1 Primary 572.40' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.35 cfs @ 15.15 hrs HW=572.57' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.35 cfs @ 1.34 fps)