complete drainage report rev 9

Existing Conditions NOAA 24-hr D 2-Year Rainfall=3.44" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 20 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 0.00 0.03 0.03 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 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 0.00 0.03 0.03 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 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 21 Summary for Subcatchment 4S: DA 2 - Perv Runoff = 33.11 cfs @ 12.26 hrs, Volume= Routed to Link 2L : DA 2 147,700 cf, Depth= 2.45" 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 10-Year Rainfall=5.22" 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 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 22 Subcatchment 4S: DA 2 - Perv Hydrograph Runoff 36 33.11 cfs 34 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=722,186 sf Runoff Volume=147,700 cf Runoff Depth=2.45" Flow Length=664' Tc=16.8 min CN=73 32 30 28 26 Flow (cfs) 24 22 20 18 16 14 12 10 8 6 4 2 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 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 0.06 0.00 2.00 0.13 0.00 3.00 0.20 0.00 4.00 0.27 0.00 5.00 0.36 0.00 6.00 0.45 0.00 7.00 0.55 0.00 8.00 0.68 0.00 9.00 0.83 0.00 10.00 1.03 0.02 11.00 1.36 0.09 12.00 2.50 0.57 13.00 3.86 1.43 14.00 4.19 1.66 15.00 4.39 1.81 16.00 4.54 1.93 17.00 4.67 2.02 18.00 4.77 2.10 19.00 4.86 2.17 20.00 4.95 2.24 21.00 5.02 2.30 22.00 5.09 2.35 23.00 5.16 2.41 24.00 5.22 2.45 25.00 5.22 2.45 26.00 5.22 2.45 27.00 5.22 2.45 28.00 5.22 2.45 29.00 5.22 2.45 30.00 5.22 2.45 31.00 5.22 2.45 32.00 5.22 2.45 33.00 5.22 2.45 34.00 5.22 2.45 35.00 5.22 2.45 36.00 5.22 2.45 37.00 5.22 2.45 38.00 5.22 2.45 39.00 5.22 2.45 40.00 5.22 2.45 41.00 5.22 2.45 42.00 5.22 2.45 43.00 5.22 2.45 44.00 5.22 2.45 45.00 5.22 2.45 46.00 5.22 2.45 47.00 5.22 2.45 48.00 5.22 2.45 49.00 5.22 2.45 50.00 5.22 2.45 Runoff (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 Precip. Excess (hours) (inches) (inches) 51.00 5.22 2.45 52.00 5.22 2.45 53.00 5.22 2.45 54.00 5.22 2.45 55.00 5.22 2.45 56.00 5.22 2.45 57.00 5.22 2.45 58.00 5.22 2.45 59.00 5.22 2.45 60.00 5.22 2.45 61.00 5.22 2.45 62.00 5.22 2.45 63.00 5.22 2.45 64.00 5.22 2.45 65.00 5.22 2.45 66.00 5.22 2.45 67.00 5.22 2.45 68.00 5.22 2.45 69.00 5.22 2.45 70.00 5.22 2.45 71.00 5.22 2.45 72.00 5.22 2.45 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 23

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 24 Summary for Subcatchment 10S: DA 1 - Perv Runoff = 19.40 cfs @ 12.33 hrs, Volume= Routed to Link 11L : DA 1 98,544 cf, Depth= 2.45" 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 10-Year Rainfall=5.22" 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 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 25 Subcatchment 10S: DA 1 - Perv Flow (cfs) Hydrograph Runoff 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 19.40 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=481,833 sf Runoff Volume=98,544 cf Runoff Depth=2.45" 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 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 Hydrograph for Subcatchment 10S: DA 1 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.06 0.00 2.00 0.13 0.00 3.00 0.20 0.00 4.00 0.27 0.00 5.00 0.36 0.00 6.00 0.45 0.00 7.00 0.55 0.00 8.00 0.68 0.00 9.00 0.83 0.00 10.00 1.03 0.02 11.00 1.36 0.09 12.00 2.50 0.57 13.00 3.86 1.43 14.00 4.19 1.66 15.00 4.39 1.81 16.00 4.54 1.93 17.00 4.67 2.02 18.00 4.77 2.10 19.00 4.86 2.17 20.00 4.95 2.24 21.00 5.02 2.30 22.00 5.09 2.35 23.00 5.16 2.41 24.00 5.22 2.45 25.00 5.22 2.45 26.00 5.22 2.45 27.00 5.22 2.45 28.00 5.22 2.45 29.00 5.22 2.45 30.00 5.22 2.45 31.00 5.22 2.45 32.00 5.22 2.45 33.00 5.22 2.45 34.00 5.22 2.45 35.00 5.22 2.45 36.00 5.22 2.45 37.00 5.22 2.45 38.00 5.22 2.45 39.00 5.22 2.45 40.00 5.22 2.45 41.00 5.22 2.45 42.00 5.22 2.45 43.00 5.22 2.45 44.00 5.22 2.45 45.00 5.22 2.45 46.00 5.22 2.45 47.00 5.22 2.45 48.00 5.22 2.45 49.00 5.22 2.45 50.00 5.22 2.45 Runoff (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 Precip. Excess (hours) (inches) (inches) 51.00 5.22 2.45 52.00 5.22 2.45 53.00 5.22 2.45 54.00 5.22 2.45 55.00 5.22 2.45 56.00 5.22 2.45 57.00 5.22 2.45 58.00 5.22 2.45 59.00 5.22 2.45 60.00 5.22 2.45 61.00 5.22 2.45 62.00 5.22 2.45 63.00 5.22 2.45 64.00 5.22 2.45 65.00 5.22 2.45 66.00 5.22 2.45 67.00 5.22 2.45 68.00 5.22 2.45 69.00 5.22 2.45 70.00 5.22 2.45 71.00 5.22 2.45 72.00 5.22 2.45 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 26

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 27 Summary for Subcatchment 14S: DA 3 - Perv Runoff = 0.32 cfs @ 12.25 hrs, Volume= Routed to Link 13L : DA 3 1,422 cf, Depth= 2.20" 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 10-Year Rainfall=5.22" 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 0.36 Runoff 0.34 0.32 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=7,751 sf Runoff Volume=1,422 cf Runoff Depth=2.20" Flow Length=170' Tc=15.8 min CN=70 0.32 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 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 0.06 0.00 2.00 0.13 0.00 3.00 0.20 0.00 4.00 0.27 0.00 5.00 0.36 0.00 6.00 0.45 0.00 7.00 0.55 0.00 8.00 0.68 0.00 9.00 0.83 0.00 10.00 1.03 0.01 11.00 1.36 0.05 12.00 2.50 0.46 13.00 3.86 1.24 14.00 4.19 1.45 15.00 4.39 1.60 16.00 4.54 1.70 17.00 4.67 1.80 18.00 4.77 1.87 19.00 4.86 1.94 20.00 4.95 2.00 21.00 5.02 2.05 22.00 5.09 2.11 23.00 5.16 2.16 24.00 5.22 2.20 25.00 5.22 2.20 26.00 5.22 2.20 27.00 5.22 2.20 28.00 5.22 2.20 29.00 5.22 2.20 30.00 5.22 2.20 31.00 5.22 2.20 32.00 5.22 2.20 33.00 5.22 2.20 34.00 5.22 2.20 35.00 5.22 2.20 36.00 5.22 2.20 37.00 5.22 2.20 38.00 5.22 2.20 39.00 5.22 2.20 40.00 5.22 2.20 41.00 5.22 2.20 42.00 5.22 2.20 43.00 5.22 2.20 44.00 5.22 2.20 45.00 5.22 2.20 46.00 5.22 2.20 47.00 5.22 2.20 48.00 5.22 2.20 49.00 5.22 2.20 50.00 5.22 2.20 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 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 Precip. Excess (hours) (inches) (inches) 51.00 5.22 2.20 52.00 5.22 2.20 53.00 5.22 2.20 54.00 5.22 2.20 55.00 5.22 2.20 56.00 5.22 2.20 57.00 5.22 2.20 58.00 5.22 2.20 59.00 5.22 2.20 60.00 5.22 2.20 61.00 5.22 2.20 62.00 5.22 2.20 63.00 5.22 2.20 64.00 5.22 2.20 65.00 5.22 2.20 66.00 5.22 2.20 67.00 5.22 2.20 68.00 5.22 2.20 69.00 5.22 2.20 70.00 5.22 2.20 71.00 5.22 2.20 72.00 5.22 2.20 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 28

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 29 Summary for Link 2L: DA 2 Inflow Area = 722,186 sf, 0.00% Impervious, Inflow Depth = 2.45" for 10-Year event Inflow = 33.11 cfs @ 12.26 hrs, Volume= 147,700 cf Primary = 33.11 cfs @ 12.26 hrs, Volume= 147,700 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 36 34 Inflow Primary 33.11 cfs 33.11 cfs Inflow Area=722,186 sf 32 30 28 26 Flow (cfs) 24 22 20 18 16 14 12 10 8 6 4 2 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)