complete drainage report rev 9

Existing Conditions NOAA 24-hr D 2-Year Rainfall=3.44" 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 0.04 0.00 2.00 0.08 0.00 3.00 0.13 0.00 4.00 0.18 0.00 5.00 0.24 0.00 6.00 0.29 0.00 7.00 0.36 0.00 8.00 0.45 0.00 9.00 0.55 0.00 10.00 0.68 0.00 11.00 0.89 0.01 12.00 1.65 0.18 13.00 2.55 0.59 14.00 2.76 0.71 15.00 2.89 0.79 16.00 2.99 0.85 17.00 3.08 0.91 18.00 3.15 0.95 19.00 3.20 0.99 20.00 3.26 1.02 21.00 3.31 1.05 22.00 3.36 1.08 23.00 3.40 1.11 24.00 3.44 1.14 25.00 3.44 1.14 26.00 3.44 1.14 27.00 3.44 1.14 28.00 3.44 1.14 29.00 3.44 1.14 30.00 3.44 1.14 31.00 3.44 1.14 32.00 3.44 1.14 33.00 3.44 1.14 34.00 3.44 1.14 35.00 3.44 1.14 36.00 3.44 1.14 37.00 3.44 1.14 38.00 3.44 1.14 39.00 3.44 1.14 40.00 3.44 1.14 41.00 3.44 1.14 42.00 3.44 1.14 43.00 3.44 1.14 44.00 3.44 1.14 45.00 3.44 1.14 46.00 3.44 1.14 47.00 3.44 1.14 48.00 3.44 1.14 49.00 3.44 1.14 50.00 3.44 1.14 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 2.05 2.70 1.19 0.85 0.66 0.57 0.47 0.41 0.39 0.36 0.34 0.31 0.29 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 3.44 1.14 52.00 3.44 1.14 53.00 3.44 1.14 54.00 3.44 1.14 55.00 3.44 1.14 56.00 3.44 1.14 57.00 3.44 1.14 58.00 3.44 1.14 59.00 3.44 1.14 60.00 3.44 1.14 61.00 3.44 1.14 62.00 3.44 1.14 63.00 3.44 1.14 64.00 3.44 1.14 65.00 3.44 1.14 66.00 3.44 1.14 67.00 3.44 1.14 68.00 3.44 1.14 69.00 3.44 1.14 70.00 3.44 1.14 71.00 3.44 1.14 72.00 3.44 1.14 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 10

Existing Conditions NOAA 24-hr D 2-Year Rainfall=3.44" 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 11 Summary for Subcatchment 14S: DA 3 - Perv Runoff = 0.13 cfs @ 12.26 hrs, Volume= Routed to Link 13L : DA 3 627 cf, Depth= 0.97" 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 2-Year Rainfall=3.44" 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 0.14 0.13 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=7,751 sf Runoff Volume=627 cf Runoff Depth=0.97" Flow Length=170' Tc=15.8 min CN=70 0.13 0.12 0.11 0.1 Flow (cfs) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 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 2-Year Rainfall=3.44" 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 0.04 0.00 2.00 0.08 0.00 3.00 0.13 0.00 4.00 0.18 0.00 5.00 0.24 0.00 6.00 0.29 0.00 7.00 0.36 0.00 8.00 0.45 0.00 9.00 0.55 0.00 10.00 0.68 0.00 11.00 0.89 0.00 12.00 1.65 0.12 13.00 2.55 0.48 14.00 2.76 0.58 15.00 2.89 0.66 16.00 2.99 0.71 17.00 3.08 0.76 18.00 3.15 0.80 19.00 3.20 0.83 20.00 3.26 0.86 21.00 3.31 0.89 22.00 3.36 0.92 23.00 3.40 0.95 24.00 3.44 0.97 25.00 3.44 0.97 26.00 3.44 0.97 27.00 3.44 0.97 28.00 3.44 0.97 29.00 3.44 0.97 30.00 3.44 0.97 31.00 3.44 0.97 32.00 3.44 0.97 33.00 3.44 0.97 34.00 3.44 0.97 35.00 3.44 0.97 36.00 3.44 0.97 37.00 3.44 0.97 38.00 3.44 0.97 39.00 3.44 0.97 40.00 3.44 0.97 41.00 3.44 0.97 42.00 3.44 0.97 43.00 3.44 0.97 44.00 3.44 0.97 45.00 3.44 0.97 46.00 3.44 0.97 47.00 3.44 0.97 48.00 3.44 0.97 49.00 3.44 0.97 50.00 3.44 0.97 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 0.03 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 Precip. Excess (hours) (inches) (inches) 51.00 3.44 0.97 52.00 3.44 0.97 53.00 3.44 0.97 54.00 3.44 0.97 55.00 3.44 0.97 56.00 3.44 0.97 57.00 3.44 0.97 58.00 3.44 0.97 59.00 3.44 0.97 60.00 3.44 0.97 61.00 3.44 0.97 62.00 3.44 0.97 63.00 3.44 0.97 64.00 3.44 0.97 65.00 3.44 0.97 66.00 3.44 0.97 67.00 3.44 0.97 68.00 3.44 0.97 69.00 3.44 0.97 70.00 3.44 0.97 71.00 3.44 0.97 72.00 3.44 0.97 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 12

Existing Conditions NOAA 24-hr D 2-Year Rainfall=3.44" 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 13 Summary for Link 2L: DA 2 Inflow Area = 722,186 sf, 0.00% Impervious, Inflow Depth = 1.14" for 2-Year event Inflow = 14.76 cfs @ 12.27 hrs, Volume= 68,577 cf Primary = 14.76 cfs @ 12.27 hrs, Volume= 68,577 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 16 15 Inflow Primary 14.76 cfs 14.76 cfs Inflow Area=722,186 sf 14 13 12 11 Flow (cfs) 10 9 8 7 6 5 4 3 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)

Existing Conditions NOAA 24-hr D 2-Year Rainfall=3.44" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 14 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 0.00 0.00 0.19 4.06 3.59 1.72 1.23 0.98 0.84 0.69 0.61 0.58 0.54 0.51 0.47 0.43 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.19 4.06 3.59 1.72 1.23 0.98 0.84 0.69 0.61 0.58 0.54 0.51 0.47 0.43 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 2-Year Rainfall=3.44" 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 15 Summary for Link 11L: DA 1 Inflow Area = 481,833 sf, 0.00% Impervious, Inflow Depth = 1.14" for 2-Year event Inflow = 8.62 cfs @ 12.34 hrs, Volume= 45,754 cf Primary = 8.62 cfs @ 12.34 hrs, Volume= 45,754 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 Hydrograph Inflow Primary 8.62 cfs 9 8.62 cfs Inflow Area=481,833 sf 8 7 Flow (cfs) 6 5 4 3 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)

Existing Conditions NOAA 24-hr D 2-Year Rainfall=3.44" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 16 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 0.00 0.00 0.10 2.05 2.70 1.19 0.85 0.66 0.57 0.47 0.41 0.39 0.36 0.34 0.31 0.29 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.10 2.05 2.70 1.19 0.85 0.66 0.57 0.47 0.41 0.39 0.36 0.34 0.31 0.29 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 2-Year Rainfall=3.44" 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 17 Summary for Link 12L: Total Inflow Area = Inflow = Primary = 1,211,770 sf, 0.00% Impervious, Inflow Depth = 1.14" for 2-Year event 22.98 cfs @ 12.29 hrs, Volume= 114,958 cf 22.98 cfs @ 12.29 hrs, Volume= 114,958 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 22.98 cfs 24 22.98 cfs Inflow Area=1,211,770 sf 22 20 18 Flow (cfs) 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 2-Year Rainfall=3.44" 2024-04-20 HydroCAD - Existing Printed 10/25/2024 Page 18 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 0.00 0.00 0.29 6.14 6.32 2.92 2.09 1.64 1.41 1.16 1.03 0.97 0.91 0.85 0.79 0.72 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.29 6.14 6.32 2.92 2.09 1.64 1.41 1.16 1.03 0.97 0.91 0.85 0.79 0.72 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 2-Year Rainfall=3.44" 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 19 Summary for Link 13L: DA 3 Inflow Area = 7,751 sf, 0.00% Impervious, Inflow Depth = 0.97" for 2-Year event Inflow = 0.13 cfs @ 12.26 hrs, Volume= 627 cf Primary = 0.13 cfs @ 12.26 hrs, Volume= 627 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 Inflow Primary 0.13 cfs 0.14 0.13 0.13 cfs Inflow Area=7,751 sf 0.12 0.11 Flow (cfs) 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 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)