complete drainage report rev 9

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 40 Summary for Subcatchment 10S: DA 1 - Perv Runoff = 42.86 cfs @ 12.32 hrs, Volume= Routed to Link 11L : DA 1 216,786 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) 197,386 284,447 481,833 481,833 CN 77 70 73 Description Woods, Good, HSG D Woods, Good, HSG C 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" 7.2 1,625 0.0540 3.74 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 22.1 1,725 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 10S: DA 1 - 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 41 Subcatchment 10S: DA 1 - Perv Flow (cfs) Hydrograph 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Runoff 42.86 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=481,833 sf Runoff Volume=216,786 cf Runoff Depth=5.40" Flow Length=1,725' Tc=22.1 min CN=73 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 10S: DA 1 - 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 0.11 0.36 0.69 1.38 2.94 14.36 10.90 4.48 3.11 2.38 2.01 1.64 1.44 1.35 1.26 1.17 1.07 0.98 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 42

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 43 Summary for Subcatchment 14S: DA 3 - Perv Runoff = 0.75 cfs @ 12.24 hrs, Volume= Routed to Link 13L : DA 3 3,253 cf, Depth= 5.04" 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) 7,751 7,751 CN 70 Description Woods, Good, HSG C 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.6 100 0.0400 0.11 Sheet Flow, Sheet Flow (A-B) Woods: Light underbrush n= 0.400 P2= 3.47" 0.2 70 0.1150 5.46 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 15.8 170 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 14S: DA 3 - Perv Subcatchment 14S: DA 3 - Perv Hydrograph Runoff 0.8 0.75 cfs 0.75 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=7,751 sf Runoff Volume=3,253 cf Runoff Depth=5.04" Flow Length=170' Tc=15.8 min CN=70 0.7 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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 14S: DA 3 - 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 0.00 8.00 1.12 0.02 9.00 1.37 0.06 10.00 1.72 0.14 11.00 2.25 0.34 12.00 4.15 1.43 13.00 6.41 3.13 14.00 6.94 3.57 15.00 7.29 3.86 16.00 7.54 4.07 17.00 7.75 4.25 18.00 7.92 4.40 19.00 8.07 4.52 20.00 8.21 4.64 21.00 8.33 4.75 22.00 8.45 4.86 23.00 8.56 4.95 24.00 8.66 5.04 25.00 8.66 5.04 26.00 8.66 5.04 27.00 8.66 5.04 28.00 8.66 5.04 29.00 8.66 5.04 30.00 8.66 5.04 31.00 8.66 5.04 32.00 8.66 5.04 33.00 8.66 5.04 34.00 8.66 5.04 35.00 8.66 5.04 36.00 8.66 5.04 37.00 8.66 5.04 38.00 8.66 5.04 39.00 8.66 5.04 40.00 8.66 5.04 41.00 8.66 5.04 42.00 8.66 5.04 43.00 8.66 5.04 44.00 8.66 5.04 45.00 8.66 5.04 46.00 8.66 5.04 47.00 8.66 5.04 48.00 8.66 5.04 49.00 8.66 5.04 50.00 8.66 5.04 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.04 0.27 0.14 0.07 0.05 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 5.04 52.00 8.66 5.04 53.00 8.66 5.04 54.00 8.66 5.04 55.00 8.66 5.04 56.00 8.66 5.04 57.00 8.66 5.04 58.00 8.66 5.04 59.00 8.66 5.04 60.00 8.66 5.04 61.00 8.66 5.04 62.00 8.66 5.04 63.00 8.66 5.04 64.00 8.66 5.04 65.00 8.66 5.04 66.00 8.66 5.04 67.00 8.66 5.04 68.00 8.66 5.04 69.00 8.66 5.04 70.00 8.66 5.04 71.00 8.66 5.04 72.00 8.66 5.04 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 44

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 45 Summary for Link 2L: DA 2 Inflow Area = 722,186 sf, 0.00% Impervious, Inflow Depth = 5.40" for 100-Year event Inflow = 72.79 cfs @ 12.25 hrs, Volume= 324,925 cf Primary = 72.79 cfs @ 12.25 hrs, Volume= 324,925 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 2L: DA 2 Hydrograph 80 75 Inflow Primary 72.79 cfs 72.79 cfs Inflow Area=722,186 sf 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 Printed 10/25/2024 Page 46 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 0.20 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 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 0.20 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 (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 47 Summary for Link 11L: DA 1 Inflow Area = 481,833 sf, 0.00% Impervious, Inflow Depth = 5.40" for 100-Year event Inflow = 42.86 cfs @ 12.32 hrs, Volume= 216,786 cf Primary = 42.86 cfs @ 12.32 hrs, Volume= 216,786 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 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Primary 42.86 cfs 42.86 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 100-Year Rainfall=8.66" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 48 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 0.11 0.36 0.69 1.38 2.94 14.36 10.90 4.48 3.11 2.38 2.01 1.64 1.44 1.35 1.26 1.17 1.07 0.98 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.11 0.36 0.69 1.38 2.94 14.36 10.90 4.48 3.11 2.38 2.01 1.64 1.44 1.35 1.26 1.17 1.07 0.98 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 49 Summary for Link 12L: Total Inflow Area = Inflow = Primary = 1,211,770 sf, 0.00% Impervious, Inflow Depth = 5.40" for 100-Year event 114.35 cfs @ 12.27 hrs, Volume= 544,964 cf 114.35 cfs @ 12.27 hrs, Volume= 544,964 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 Inflow Primary 114.35 cfs 120 114.35 cfs Inflow Area=1,211,770 sf 110 100 90 Flow (cfs) 80 70 60 50 40 30 20 10 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)