complete drainage report rev 9

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 30 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 2L: DA 2 Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.44 1.44 10.92 7.11 3.29 2.32 1.83 1.56 1.27 1.13 1.06 0.99 0.92 0.85 0.77 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.44 1.44 10.92 7.11 3.29 2.32 1.83 1.56 1.27 1.13 1.06 0.99 0.92 0.85 0.77 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 51.00 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 31 Summary for Link 11L: DA 1 Inflow Area = 481,833 sf, 0.00% Impervious, Inflow Depth = 2.45" for 10-Year event Inflow = 19.40 cfs @ 12.33 hrs, Volume= 98,544 cf Primary = 19.40 cfs @ 12.33 hrs, Volume= 98,544 cf, Atten= 0%, Lag= 0.0 min Routed to Link 12L : Total Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Link 11L: DA 1 Flow (cfs) Hydrograph 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Primary 19.40 cfs 19.40 cfs Inflow Area=481,833 sf 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)

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 32 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 11L: DA 1 Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.27 0.86 5.73 5.40 2.28 1.60 1.24 1.05 0.86 0.76 0.71 0.67 0.62 0.57 0.52 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.27 0.86 5.73 5.40 2.28 1.60 1.24 1.05 0.86 0.76 0.71 0.67 0.62 0.57 0.52 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 51.00 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 33 Summary for Link 12L: Total Inflow Area = Inflow = Primary = 1,211,770 sf, 0.00% Impervious, Inflow Depth = 2.45" for 10-Year event 51.71 cfs @ 12.28 hrs, Volume= 247,666 cf 51.71 cfs @ 12.28 hrs, Volume= 247,666 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Link 12L: Total Hydrograph 55 Inflow Primary 51.71 cfs 51.71 cfs Inflow Area=1,211,770 sf 50 45 40 Flow (cfs) 35 30 25 20 15 10 5 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)

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 34 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 12L: Total Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.71 2.31 16.76 12.57 5.61 3.95 3.08 2.62 2.15 1.90 1.79 1.67 1.55 1.43 1.30 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.71 2.31 16.76 12.57 5.61 3.95 3.08 2.62 2.15 1.90 1.79 1.67 1.55 1.43 1.30 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 51.00 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 35 Summary for Link 13L: DA 3 Inflow Area = 7,751 sf, 0.00% Impervious, Inflow Depth = 2.20" for 10-Year event Inflow = 0.32 cfs @ 12.25 hrs, Volume= 1,422 cf Primary = 0.32 cfs @ 12.25 hrs, Volume= 1,422 cf, Atten= 0%, Lag= 0.0 min Routed to Link 12L : Total Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Link 13L: DA 3 Hydrograph 0.36 0.34 0.32 Inflow Primary 0.32 cfs 0.32 cfs Inflow Area=7,751 sf 0.3 0.28 0.26 0.24 Flow (cfs) 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 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)

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 36 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 13L: DA 3 Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.10 0.07 0.03 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.10 0.07 0.03 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 51.00 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Existing Conditions NOAA 24-hr D 100-Year Rainfall=8.66" 2024-04-20 HydroCAD - Existing Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 37 Summary for Subcatchment 4S: DA 2 - Perv Runoff = 72.79 cfs @ 12.25 hrs, Volume= Routed to Link 2L : DA 2 324,925 cf, Depth= 5.40" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 399,842 36,590 257,004 28,750 722,186 722,186 CN 70 74 77 80 73 Description Woods, Good, HSG C >75% Grass cover, Good, HSG C Woods, Good, HSG D >75% Grass cover, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.9 100 0.0450 0.11 Sheet Flow, Sheet Flow (A-B) Woods: Light underbrush n= 0.400 P2= 3.47" 1.9 564 0.0920 4.88 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 16.8 664 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 4S: DA 2 - Perv

Existing Conditions NOAA 24-hr D 100-Year Rainfall=8.66" 2024-04-20 HydroCAD - Existing Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 38 Subcatchment 4S: DA 2 - Perv Hydrograph 80 Runoff 72.79 cfs 75 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=722,186 sf Runoff Volume=324,925 cf Runoff Depth=5.40" Flow Length=664' Tc=16.8 min CN=73 70 65 60 55 Flow (cfs) 50 45 40 35 30 25 20 15 10 5 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)

Existing Conditions NOAA 24-hr D 100-Year Rainfall=8.66" 2024-04-20 HydroCAD - Existing Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: DA 2 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.10 0.00 2.00 0.21 0.00 3.00 0.33 0.00 4.00 0.45 0.00 5.00 0.59 0.00 6.00 0.74 0.00 7.00 0.91 0.01 8.00 1.12 0.04 9.00 1.37 0.09 10.00 1.72 0.20 11.00 2.25 0.44 12.00 4.15 1.64 13.00 6.41 3.43 14.00 6.94 3.89 15.00 7.29 4.18 16.00 7.54 4.40 17.00 7.75 4.59 18.00 7.92 4.74 19.00 8.07 4.87 20.00 8.21 4.99 21.00 8.33 5.11 22.00 8.45 5.21 23.00 8.56 5.31 24.00 8.66 5.40 25.00 8.66 5.40 26.00 8.66 5.40 27.00 8.66 5.40 28.00 8.66 5.40 29.00 8.66 5.40 30.00 8.66 5.40 31.00 8.66 5.40 32.00 8.66 5.40 33.00 8.66 5.40 34.00 8.66 5.40 35.00 8.66 5.40 36.00 8.66 5.40 37.00 8.66 5.40 38.00 8.66 5.40 39.00 8.66 5.40 40.00 8.66 5.40 41.00 8.66 5.40 42.00 8.66 5.40 43.00 8.66 5.40 44.00 8.66 5.40 45.00 8.66 5.40 46.00 8.66 5.40 47.00 8.66 5.40 48.00 8.66 5.40 49.00 8.66 5.40 50.00 8.66 5.40 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.20 0.57 1.07 2.18 4.78 26.79 14.23 6.45 4.50 3.52 2.97 2.42 2.15 2.01 1.87 1.74 1.60 1.45 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 8.66 5.40 52.00 8.66 5.40 53.00 8.66 5.40 54.00 8.66 5.40 55.00 8.66 5.40 56.00 8.66 5.40 57.00 8.66 5.40 58.00 8.66 5.40 59.00 8.66 5.40 60.00 8.66 5.40 61.00 8.66 5.40 62.00 8.66 5.40 63.00 8.66 5.40 64.00 8.66 5.40 65.00 8.66 5.40 66.00 8.66 5.40 67.00 8.66 5.40 68.00 8.66 5.40 69.00 8.66 5.40 70.00 8.66 5.40 71.00 8.66 5.40 72.00 8.66 5.40 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 10/25/2024 Page 39