Drainage Report

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 27 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 0.16 0.00 0.00 0.00 5.00 0.36 0.00 0.00 0.00 7.50 0.61 0.00 0.00 0.00 10.00 1.03 0.01 0.00 0.03 12.50 3.57 1.05 0.00 2.78 15.00 4.39 1.60 0.00 0.35 17.50 4.73 1.83 0.00 0.21 20.00 4.95 2.00 0.00 0.16 22.50 5.13 2.13 0.00 0.13 25.00 5.22 2.20 0.00 0.00 27.50 5.22 2.20 0.00 0.00 30.00 5.22 2.20 0.00 0.00 32.50 5.22 2.20 0.00 0.00 35.00 5.22 2.20 0.00 0.00 37.50 5.22 2.20 0.00 0.00 40.00 5.22 2.20 0.00 0.00 42.50 5.22 2.20 0.00 0.00 45.00 5.22 2.20 0.00 0.00 47.50 5.22 2.20 0.00 0.00 50.00 5.22 2.20 0.00 0.00 52.50 5.22 2.20 0.00 0.00 55.00 5.22 2.20 0.00 0.00 57.50 5.22 2.20 0.00 0.00 60.00 5.22 2.20 0.00 0.00 62.50 5.22 2.20 0.00 0.00 65.00 5.22 2.20 0.00 0.00 67.50 5.22 2.20 0.00 0.00 70.00 5.22 2.20 0.00 0.00

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 28 Summary for Pond 35P: Basin 3 Inflow Area = 2.191 ac, Inflow Depth = 3.37" for 10-Year event Inflow = 6.79 cfs @ 12.17 hrs, Volume= 0.615 af Outflow = 0.87 cfs @ 13.12 hrs, Volume= 0.352 af, Atten= 87%, Lag= 56.9 min Primary = 0.87 cfs @ 13.12 hrs, Volume= 0.352 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 530.77' @ 13.12 hrs Surf.Area= 8,004 sf Storage= 15,712 cf Plug-Flow detention time= 393.9 min calculated for 0.352 af (57% of inflow) Center-of-Mass det. time= 268.4 min ( 1,069.1 - 800.7 ) 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=0.86 cfs @ 13.12 hrs HW=530.77' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.53 cfs @ 2.72 fps) 2=Orifice/Grate (Orifice Controls 0.33 cfs @ 1.32 fps)

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 29 Pond 35P: Basin 3 Hydrograph Inflow 6.79 cfs Primary 7 Inflow Area=2.191 ac 6 Peak Elev=530.77' Storage=15,712 cf 5 Flow (cfs) 4 3 2 0.87 cfs 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)

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 30 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 0.03 102 528.03 0.00 5.00 0.05 489 528.14 0.00 7.50 0.09 1,085 528.30 0.00 10.00 0.22 2,251 528.58 0.00 12.50 1.95 14,552 530.62 0.41 15.00 0.33 14,716 530.64 0.46 17.50 0.20 13,907 530.54 0.28 20.00 0.15 13,396 530.47 0.19 22.50 0.13 13,148 530.44 0.15 25.00 0.00 12,693 530.37 0.09 27.50 0.00 12,201 530.31 0.03 30.00 0.00 11,979 530.27 0.02 32.50 0.00 11,852 530.26 0.01 35.00 0.00 11,771 530.25 0.01 37.50 0.00 11,720 530.24 0.00 40.00 0.00 11,680 530.23 0.00 42.50 0.00 11,646 530.23 0.00 45.00 0.00 11,617 530.22 0.00 47.50 0.00 11,592 530.22 0.00 50.00 0.00 11,571 530.22 0.00 52.50 0.00 11,553 530.21 0.00 55.00 0.00 11,538 530.21 0.00 57.50 0.00 11,525 530.21 0.00 60.00 0.00 11,514 530.21 0.00 62.50 0.00 11,504 530.21 0.00 65.00 0.00 11,496 530.21 0.00 67.50 0.00 11,489 530.21 0.00 70.00 0.00 11,484 530.20 0.00

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 31 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 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 32 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

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 4,752 531.65 9,560 23,457 529.15 5,283 5,014 531.70 9,649 23,937 529.20 5,364 5,280 531.75 9,737 24,422 529.25 5,444 5,551 531.80 9,825 24,911 529.30 5,524 5,825 531.85 9,913 25,404 529.35 5,604 6,103 531.90 10,001 25,902 529.40 5,685 6,385 531.95 10,090 26,404 529.45 5,765 6,671 532.00 10,178 26,911 529.50 5,845 6,962 529.55 5,926 7,256 529.60 6,006 7,554 529.65 6,086 7,857 529.70 6,166 8,163 529.75 6,247 8,473 529.80 6,327 8,788 529.85 6,407 9,106 529.90 6,487 9,428 529.95 6,568 9,755 530.00 6,648 10,085 530.05 6,736 10,420 530.10 6,825 10,759 530.15 6,913 11,102 530.20 7,001 11,450 530.25 7,089 11,802 530.30 7,177 12,159 530.35 7,266 12,520 530.40 7,354 12,885 530.45 7,442 13,255 530.50 7,531 13,630

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 33 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 34S: Basin 3 Runoff Area=95,425 sf Runoff Depth=6.50" Flow Length=670' Tc=10.0 min CN=74/98 Runoff=13.09 cfs 1.188 af Subcatchment 36S: Basin 3 undetained Runoff Area=18,573 sf Runoff Depth=6.57" Flow Length=45' Slope=0.1000 '/' Tc=10.0 min CN=74/98 Runoff=2.56 cfs 0.234 af Subcatchment 37S: Basin 3 pre-development Runoff Area=113,998 sf Runoff Depth=5.04" Flow Length=304' Tc=19.4 min CN=70/0 Runoff=10.09 cfs 1.098 af Pond 35P: Basin 3 Peak Elev=531.69' Storage=23,858 cf Inflow=13.09 cfs 1.188 af Outflow=4.35 cfs 0.924 af Total Runoff Area = 5.234 ac Runoff Volume = 2.519 af Average Runoff Depth = 5.78"