Drainage Report

Basin 3 without exfiltration proposed basin 3 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 37S: Basin 3 pre-development Runoff = 1.79 cfs @ 12.31 hrs, Volume= 0.212 af, Depth= 0.97" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 113,998 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 100 0.0400 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 3.7 204 0.0340 0.92 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 19.4 304 Total Subcatchment 37S: Basin 3 pre-development Hydrograph 2 Runoff 1.79 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=113,998 sf Runoff Volume=0.212 af Flow (cfs) 1 Runoff Depth=0.97"

12 af Flow (cfs) 1 Runoff Depth=0.97" Flow Length=304' Tc=19.4 min 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 3 without exfiltration proposed basin 3 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 37S: Basin 3 pre-development Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 2.50 0.11 0.00 0.00 0.00 5.00 0.24 0.00 0.00 0.00 7.50 0.40 0.00 0.00 0.00 10.00 0.68 0.00 0.00 0.00 12.50 2.35 0.39 0.00 1.23 15.00 2.89 0.66 0.00 0.18 17.50 3.11 0.78 0.00 0.11 20.00 3.26 0.86 0.00 0.08 22.50 3.38 0.93 0.00 0.07 25.00 3.44 0.97 0.00 0.00 27.50 3.44 0.97 0.00 0.00 30.00 3.44 0.97 0.00 0.00 32.50 3.44 0.97 0.00 0.00 35.00 3.44 0.97 0.00 0.00 37.50 3.44 0.97 0.00 0.00 40.00 3.44 0.97 0.00 0.00 42.50 3.44 0.97 0.00 0.00 45.00 3.44 0.97 0.00 0.00 47.50 3.44 0.97 0.00 0.00 50.00 3.44 0.97 0.00 0.00 52.50 3.44 0.97 0.00 0.00 55.00 3.44 0.97 0.00 0.00 57.50 3.44 0.97 0.00 0.00 60.00 3.44 0.97 0.00 0.00 62.50 3.44 0.97 0.00 0.00 65.00 3.44 0.97 0.00 0.00 67.50 3.44 0.97 0.00 0.00 70.00 3.44 0.97 0.00 0.00

Basin 3 without exfiltration proposed basin 3 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 35P: Basin 3 Inflow Area = 2.191 ac, Inflow Depth = 1.88" for 2-Year event Inflow = 3.73 cfs @ 12.17 hrs, Volume= 0.343 af Outflow = 0.09 cfs @ 20.28 hrs, Volume= 0.080 af, Atten= 98%, Lag= 486.3 min Primary = 0.09 cfs @ 20.28 hrs, Volume= 0.080 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 530.38' @ 20.28 hrs Surf.Area= 7,314 sf Storage= 12,717 cf Plug-Flow detention time= 853.2 min calculated for 0.080 af (23% of inflow) Center-of-Mass det. time= 638.4 min ( 1,446.6 - 808.2 ) Volume Invert Avail.Storage Storage Description #1 528.00' 26,911 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 528.00 3,437 0 0 530.00 6,648 10,085 10,085 532.00 10,178 16,826 26,911 Device Routing Invert Outlet Devices #1 Primary 530.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 530.60' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.09 cfs @ 20.28 hrs HW=530.38' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.09 cfs @ 1.43 fps) 2=Orifice/Grate ( Controls 0.00 cfs)

Basin 3 without exfiltration proposed basin 3 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 35P: Basin 3 Hydrograph Inflow 3.73 cfs Primary 4 Inflow Area=2.191 ac Peak Elev=530.38' 3 Storage=12,717 cf Flow (cfs) 2 1 0.09 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 3 without exfiltration proposed basin 3 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 35P: Basin 3 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 528.00 0.00 2.50 0.01 34 528.01 0.00 5.00 0.03 239 528.07 0.00 7.50 0.05 595 528.17 0.00 10.00 0.11 1,252 528.34 0.00 12.50 1.10 7,923 529.66 0.00 15.00 0.19 11,508 530.21 0.00 17.50 0.12 12,563 530.36 0.07 20.00 0.09 12,717 530.38 0.09 22.50 0.08 12,677 530.37 0.08 25.00 0.00 12,418 530.34 0.06 27.50 0.00 12,083 530.29 0.03 30.00 0.00 11,916 530.27 0.01 32.50 0.00 11,812 530.25 0.01 35.00 0.00 11,746 530.24 0.01 37.50 0.00 11,701 530.24 0.00 40.00 0.00 11,664 530.23 0.00 42.50 0.00 11,633 530.23 0.00 45.00 0.00 11,605 530.22 0.00 47.50 0.00 11,582 530.22 0.00 50.00 0.00 11,563 530.22 0.00 52.50 0.00 11,546 530.21 0.00 55.00 0.00 11,532 530.21 0.00 57.50 0.00 11,520 530.21 0.00 60.00 0.00 11,509 530.21 0.00 62.50 0.00 11,501 530.21 0.00 65.00 0.00 11,493 530.21 0.00 67.50 0.00 11,487 530.21 0.00 70.00 0.00 11,481 530.20 0.00

Basin 3 without exfiltration proposed basin 3 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 18 Stage-Discharge for Pond 35P: Basin 3 Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 528.00 0.00 529.02 0.00 530.04 0.00 531.06 2.24 528.02 0.00 529.04 0.00 530.06 0.00 531.08 2.35 528.04 0.00 529.06 0.00 530.08 0.00 531.10 2.46 528.06 0.00 529.08 0.00 530.10 0.00 531.12 2.57 528.08 0.00 529.10 0.00 530.12 0.00 531.14 2.66 528.10 0.00 529.12 0.00 530.14 0.00 531.16 2.74 528.12 0.00 529.14 0.00 530.16 0.00 531.18 2.83 528.14 0.00 529.16 0.00 530.18 0.00 531.20 2.90 528.16 0.00 529.18 0.00 530.20 0.00 531.22 2.98 528.18 0.00 529.20 0.00 530.22 0.00 531.24 3.05 528.20 0.00 529.22 0.00 530.24 0.01 531.26 3.12 528.22 0.00 529.24 0.00 530.26 0.01 531.28 3.19 528.24 0.00 529.26 0.00 530.28 0.02 531.30 3.26 528.26 0.00 529.28 0.00 530.30 0.03 531.32 3.33 528.28 0.00 529.30 0.00 530.32 0.04 531.34 3.39 528.30 0.00 529.32 0.00 530.34 0.06 531.36 3.45 528.32 0.00 529.34 0.00 530.36 0.07 531.38 3.52 528.34 0.00 529.36 0.00 530.38 0.09 531.40 3.58 528.36 0.00 529.38 0.00 530.40 0.11

.07 531.38 3.52 528.34 0.00 529.36 0.00 530.38 0.09 531.40 3.58 528.36 0.00 529.38 0.00 530.40 0.11 531.42 3.63 528.38 0.00 529.40 0.00 530.42 0.13 531.44 3.69 528.40 0.00 529.42 0.00 530.44 0.16 531.46 3.75 528.42 0.00 529.44 0.00 530.46 0.18 531.48 3.81 528.44 0.00 529.46 0.00 530.48 0.20 531.50 3.86 528.46 0.00 529.48 0.00 530.50 0.23 531.52 3.92 528.48 0.00 529.50 0.00 530.52 0.26 531.54 3.97 528.50 0.00 529.52 0.00 530.54 0.28 531.56 4.02 528.52 0.00 529.54 0.00 530.56 0.31 531.58 4.08 528.54 0.00 529.56 0.00 530.58 0.34 531.60 4.13 528.56 0.00 529.58 0.00 530.60 0.36 531.62 4.18 528.58 0.00 529.60 0.00 530.62 0.40 531.64 4.23 528.60 0.00 529.62 0.00 530.64 0.45 531.66 4.28 528.62 0.00 529.64 0.00 530.66 0.51 531.68 4.33 528.64 0.00 529.66 0.00 530.68 0.57 531.70 4.37 528.66 0.00 529.68 0.00 530.70 0.62 531.72 4.42 528.68 0.00 529.70 0.00 530.72 0.69 531.74 4.47 528.70 0.00 529.72 0.00 530.74 0.76 531.76 4.52 528.72 0.00 529.74 0.00 530.76 0.83 531.78 4.56 528.74 0.00 529.76 0.00 530.78 0.91 531.80 4.61 528.76 0.00 529.78 0.00 530.80 0.99 531.82 4.65 528.78 0.00 529.80 0.00 530.82 1.07 531.84 4.70 528.80 0.00 529.82 0.00 530.84 1.16 531.86 4.74 528.82 0.00 529.84 0.00 530.86

2 1.07 531.84 4.70 528.80 0.00 529.82 0.00 530.84 1.16 531.86 4.74 528.82 0.00 529.84 0.00 530.86 1.24 531.88 4.79 528.84 0.00 529.86 0.00 530.88 1.33 531.90 4.83 528.86 0.00 529.88 0.00 530.90 1.43 531.92 4.87 528.88 0.00 529.90 0.00 530.92 1.52 531.94 4.92 528.90 0.00 529.92 0.00 530.94 1.62 531.96 4.96 528.92 0.00 529.94 0.00 530.96 1.72 531.98 5.00 528.94 0.00 529.96 0.00 530.98 1.82 532.00 5.04 528.96 0.00 529.98 0.00 531.00 1.92 528.98 0.00 530.00 0.00 531.02 2.02 529.00 0.00 530.02 0.00 531.04 2.13

Basin 3 without exfiltration proposed basin 3 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 19 Stage-Area-Storage for Pond 35P: Basin 3 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 528.00 3,437 0 530.55 7,619 14,008 528.05 3,517 174 530.60 7,707 14,392 528.10 3,598 352 530.65 7,795 14,779 528.15 3,678 534 530.70 7,884 15,171 528.20 3,758 720 530.75 7,972 15,567 528.25 3,838 909 530.80 8,060 15,968 528.30 3,919 1,103 530.85 8,148 16,373 528.35 3,999 1,301 530.90 8,236 16,783 528.40 4,079 1,503 530.95 8,325 17,197 528.45 4,159 1,709 531.00 8,413 17,616 528.50 4,240 1,919 531.05 8,501 18,038 528.55 4,320 2,133 531.10 8,590 18,466 528.60 4,400 2,351 531.15 8,678 18,897 528.65 4,481 2,573 531.20 8,766 19,333 528.70 4,561 2,799 531.25 8,854 19,774 528.75 4,641 3,029 531.30 8,942 20,219 528.80 4,721 3,263 531.35 9,031 20,668 528.85 4,802 3,501 531.40 9,119 21,122 528.90 4,882 3,744 531.45 9,207 21,580 528.95 4,962 3,990 531.50 9,296 22,043 529.00 5,043 4,240 531.55 9,384 22,510 529.05 5,123 4,494 531.60 9,472 22,981 529.10 5,203