Drainage Report

Hydrograph Runoff 2.94 cfs 3 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=68,635 sf 2 Runoff Volume=0.243 af Flow (cfs) Runoff Depth=1.85" Flow Length=394' Tc=7.6 min 1 CN=74/98 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 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 12 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 0.06 0.00 0.00 0.00 3.00 0.13 0.00 0.03 0.01 4.50 0.21 0.00 0.07 0.02 6.00 0.29 0.00 0.14 0.02 7.50 0.40 0.00 0.23 0.04 9.00 0.55 0.00 0.36 0.05 10.50 0.77 0.00 0.57 0.09 12.00 1.65 0.20 1.43 1.36 13.50 2.67 0.71 2.44 0.25 15.00 2.89 0.84 2.66 0.14 16.50 3.04 0.93 2.81 0.10 18.00 3.15 1.00 2.91 0.08 19.50 3.23 1.06 3.00 0.07 21.00 3.31 1.11 3.08 0.06 22.50 3.38 1.16 3.15 0.05 24.00 3.44 1.20 3.21 0.05 25.50 3.44 1.20 3.21 0.00 27.00 3.44 1.20 3.21 0.00 28.50 3.44 1.20 3.21 0.00 30.00 3.44 1.20 3.21 0.00 31.50 3.44 1.20 3.21 0.00 33.00 3.44 1.20 3.21 0.00 34.50 3.44 1.20 3.21 0.00 36.00 3.44 1.20 3.21 0.00 37.50 3.44 1.20 3.21 0.00 39.00 3.44 1.20 3.21 0.00 40.50 3.44 1.20 3.21 0.00 42.00 3.44 1.20 3.21 0.00 43.50 3.44 1.20 3.21 0.00 45.00 3.44 1.20 3.21 0.00 46.50 3.44 1.20 3.21 0.00 48.00 3.44 1.20 3.21 0.00 49.50 3.44 1.20 3.21 0.00 51.00 3.44 1.20 3.21 0.00 52.50 3.44 1.20 3.21 0.00 54.00 3.44 1.20 3.21 0.00 55.50 3.44

1.20 3.21 0.00 51.00 3.44 1.20 3.21 0.00 52.50 3.44 1.20 3.21 0.00 54.00 3.44 1.20 3.21 0.00 55.50 3.44 1.20 3.21 0.00 57.00 3.44 1.20 3.21 0.00 58.50 3.44 1.20 3.21 0.00 60.00 3.44 1.20 3.21 0.00 61.50 3.44 1.20 3.21 0.00 63.00 3.44 1.20 3.21 0.00 64.50 3.44 1.20 3.21 0.00 66.00 3.44 1.20 3.21 0.00 67.50 3.44 1.20 3.21 0.00 69.00 3.44 1.20 3.21 0.00 70.50 3.44 1.20 3.21 0.00 72.00 3.44 1.20 3.21 0.00

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment 26S: pre-dev basin 5 Runoff = 3.33 cfs @ 12.20 hrs, Volume= 0.312 af, Depth= 0.97" 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 2-Year Rainfall=3.44" 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 3.33 cfs NOAA 24-hr D 3 2-Year Rainfall=3.44" Runoff Area=167,719 sf Runoff Volume=0.312 af Flow (cfs) 2 Runoff Depth=0.97"

af Flow (cfs) 2 Runoff Depth=0.97" Flow Length=274' Tc=11.5 min 1 CN=70/0 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 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 14 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 0.06 0.00 0.00 0.00 3.00 0.13 0.00 0.00 0.00 4.50 0.21 0.00 0.00 0.00 6.00 0.29 0.00 0.00 0.00 7.50 0.40 0.00 0.00 0.00 9.00 0.55 0.00 0.00 0.00 10.50 0.77 0.00 0.00 0.00 12.00 1.65 0.12 0.00 0.99 13.50 2.67 0.54 0.00 0.45 15.00 2.89 0.66 0.00 0.25 16.50 3.04 0.74 0.00 0.19 18.00 3.15 0.80 0.00 0.14 19.50 3.23 0.85 0.00 0.13 21.00 3.31 0.89 0.00 0.11 22.50 3.38 0.93 0.00 0.10 24.00 3.44 0.97 0.00 0.09 25.50 3.44 0.97 0.00 0.00 27.00 3.44 0.97 0.00 0.00 28.50 3.44 0.97 0.00 0.00 30.00 3.44 0.97 0.00 0.00 31.50 3.44 0.97 0.00 0.00 33.00 3.44 0.97 0.00 0.00 34.50 3.44 0.97 0.00 0.00 36.00 3.44 0.97 0.00 0.00 37.50 3.44 0.97 0.00 0.00 39.00 3.44 0.97 0.00 0.00 40.50 3.44 0.97 0.00 0.00 42.00 3.44 0.97 0.00 0.00 43.50 3.44 0.97 0.00 0.00 45.00 3.44 0.97 0.00 0.00 46.50 3.44 0.97 0.00 0.00 48.00 3.44 0.97 0.00 0.00 49.50 3.44 0.97 0.00 0.00 51.00 3.44 0.97 0.00 0.00 52.50 3.44 0.97 0.00 0.00 54.00 3.44 0.97 0.00 0.00 55.50 3.44

0.97 0.00 0.00 51.00 3.44 0.97 0.00 0.00 52.50 3.44 0.97 0.00 0.00 54.00 3.44 0.97 0.00 0.00 55.50 3.44 0.97 0.00 0.00 57.00 3.44 0.97 0.00 0.00 58.50 3.44 0.97 0.00 0.00 60.00 3.44 0.97 0.00 0.00 61.50 3.44 0.97 0.00 0.00 63.00 3.44 0.97 0.00 0.00 64.50 3.44 0.97 0.00 0.00 66.00 3.44 0.97 0.00 0.00 67.50 3.44 0.97 0.00 0.00 69.00 3.44 0.97 0.00 0.00 70.50 3.44 0.97 0.00 0.00 72.00 3.44 0.97 0.00 0.00

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 15 Summary for Pond 24P: Infiltration basin 5 Inflow Area = 2.275 ac, Inflow Depth = 2.46" for 2-Year event Inflow = 4.83 cfs @ 12.19 hrs, Volume= 0.466 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.03 hrs Peak Elev= 572.14' @ 24.66 hrs Surf.Area= 12,410 sf Storage= 20,319 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) 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=0.00 cfs @ 0.00 hrs HW=570.50' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs)

Basin 5 witout exfiltration Proposed basin 5 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 16 Pond 24P: Infiltration basin 5 Hydrograph Inflow 4.83 cfs Primary 5 Inflow Area=2.275 ac Peak Elev=572.14' Storage=20,319 cf 4 Flow (cfs) 3 2 1 0.00 cfs 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 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 17 Hydrograph for Pond 24P: Infiltration basin 5 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 570.50 0.00 1.50 0.01 4 570.50 0.00 3.00 0.03 118 570.51 0.00 4.50 0.05 355 570.53 0.00 6.00 0.07 683 570.56 0.00 7.50 0.10 1,135 570.59 0.00 9.00 0.14 1,779 570.64 0.00 10.50 0.25 2,802 570.73 0.00 12.00 2.12 6,214 571.00 0.00 13.50 0.45 14,558 571.67 0.00 15.00 0.23 16,261 571.81 0.00 16.50 0.17 17,314 571.90 0.00 18.00 0.13 18,120 571.96 0.00 19.50 0.11 18,749 572.01 0.00 21.00 0.10 19,317 572.06 0.00 22.50 0.09 19,825 572.10 0.00 24.00 0.08 20,271 572.13 0.00 25.50 0.00 20,319 572.14 0.00 27.00 0.00 20,319 572.14 0.00 28.50 0.00 20,319 572.14 0.00 30.00 0.00 20,319 572.14 0.00 31.50 0.00 20,319 572.14 0.00 33.00 0.00 20,319 572.14 0.00 34.50 0.00 20,319 572.14 0.00 36.00 0.00 20,319 572.14 0.00 37.50 0.00 20,319 572.14 0.00 39.00 0.00 20,319 572.14 0.00 40.50 0.00 20,319 572.14 0.00 42.00 0.00 20,319 572.14 0.00 43.50 0.00 20,319 572.14 0.00 45.00 0.00 20,319 572.14 0.00 46.50 0.00 20,319 572.14 0.00 48.00 0.00 20,319