Drainage Report

Basin 5 witout exfiltration Proposed basin 5 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 24P: Infiltration basin 5 Hydrograph Inflow 8.00 cfs Primary 8 Inflow Area=2.275 ac 7 Peak Elev=572.57' 6 Storage=25,739 cf Flow (cfs) 5 4 3 2 1 0.35 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 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 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 0.03 34 570.50 0.00 3.00 0.07 306 570.52 0.00 4.50 0.10 754 570.56 0.00 6.00 0.12 1,324 570.61 0.00 7.50 0.17 2,073 570.67 0.00 9.00 0.23 3,115 570.75 0.00 10.50 0.43 4,848 570.89 0.00 12.00 3.55 10,646 571.36 0.00 13.50 0.73 24,349 572.46 0.07 15.00 0.37 25,732 572.57 0.35 16.50 0.28 25,602 572.56 0.32 18.00 0.20 25,338 572.54 0.26 19.50 0.18 25,106 572.52 0.21 21.00 0.16 24,966 572.51 0.18 22.50 0.14 24,857 572.50 0.16 24.00 0.12 24,758 572.50 0.14 25.50 0.00 24,284 572.46 0.07 27.00 0.00 24,021 572.44 0.03 28.50 0.00 23,883 572.42 0.02 30.00 0.00 23,797 572.42 0.01 31.50 0.00 23,736 572.41 0.01 33.00 0.00 23,691 572.41 0.01 34.50 0.00 23,660 572.41 0.00 36.00 0.00 23,637 572.40 0.00 37.50 0.00 23,621 572.40 0.00 39.00 0.00 23,609 572.40 0.00 40.50 0.00 23,600 572.40 0.00 42.00 0.00 23,594 572.40 0.00 43.50 0.00 23,590 572.40 0.00 45.00 0.00 23,587 572.40 0.00 46.50 0.00 23,585 572.40 0.00 48.00 0.00 23,583

0 0.00 23,590 572.40 0.00 45.00 0.00 23,587 572.40 0.00 46.50 0.00 23,585 572.40 0.00 48.00 0.00 23,583 572.40 0.00 49.50 0.00 23,582 572.40 0.00 51.00 0.00 23,581 572.40 0.00 52.50 0.00 23,581 572.40 0.00 54.00 0.00 23,580 572.40 0.00 55.50 0.00 23,580 572.40 0.00 57.00 0.00 23,580 572.40 0.00 58.50 0.00 23,579 572.40 0.00 60.00 0.00 23,579 572.40 0.00 61.50 0.00 23,579 572.40 0.00 63.00 0.00 23,579 572.40 0.00 64.50 0.00 23,579 572.40 0.00 66.00 0.00 23,579 572.40 0.00 67.50 0.00 23,579 572.40 0.00 69.00 0.00 23,579 572.40 0.00 70.50 0.00 23,579 572.40 0.00 72.00 0.00 23,579 572.40 0.00

Basin 5 witout exfiltration Proposed basin 5 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 24P: Infiltration basin 5 Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 570.50 0.00 571.52 0.00 572.54 0.25 573.56 3.43 570.52 0.00 571.54 0.00 572.56 0.31 573.58 3.47 570.54 0.00 571.56 0.00 572.58 0.37 573.60 3.51 570.56 0.00 571.58 0.00 572.60 0.43 573.62 3.55 570.58 0.00 571.60 0.00 572.62 0.50 573.64 3.58 570.60 0.00 571.62 0.00 572.64 0.57 573.66 3.62 570.62 0.00 571.64 0.00 572.66 0.64 573.68 3.66 570.64 0.00 571.66 0.00 572.68 0.71 573.70 3.69 570.66 0.00 571.68 0.00 572.70 0.79 573.72 3.73 570.68 0.00 571.70 0.00 572.72 0.87 573.74 3.76 570.70 0.00 571.72 0.00 572.74 0.95 573.76 3.80 570.72 0.00 571.74 0.00 572.76 1.04 573.78 3.83 570.74 0.00 571.76 0.00 572.78 1.13 573.80 3.86 570.76 0.00 571.78 0.00 572.80 1.22 573.82 3.90 570.78 0.00 571.80 0.00 572.82 1.31 573.84 3.93 570.80 0.00 571.82 0.00 572.84 1.41 573.86 3.97 570.82 0.00 571.84 0.00 572.86 1.50 573.88 4.00 570.84 0.00 571.86 0.00 572.88 1.60 573.90 4.03 570.86 0.00 571.88 0.00 572.90 1.70

1.50 573.88 4.00 570.84 0.00 571.86 0.00 572.88 1.60 573.90 4.03 570.86 0.00 571.88 0.00 572.90 1.70 573.92 4.06 570.88 0.00 571.90 0.00 572.92 1.79 573.94 4.10 570.90 0.00 571.92 0.00 572.94 1.87 573.96 4.13 570.92 0.00 571.94 0.00 572.96 1.95 573.98 4.16 570.94 0.00 571.96 0.00 572.98 2.02 574.00 4.19 570.96 0.00 571.98 0.00 573.00 2.09 570.98 0.00 572.00 0.00 573.02 2.15 571.00 0.00 572.02 0.00 573.04 2.21 571.02 0.00 572.04 0.00 573.06 2.27 571.04 0.00 572.06 0.00 573.08 2.33 571.06 0.00 572.08 0.00 573.10 2.39 571.08 0.00 572.10 0.00 573.12 2.44 571.10 0.00 572.12 0.00 573.14 2.50 571.12 0.00 572.14 0.00 573.16 2.55 571.14 0.00 572.16 0.00 573.18 2.60 571.16 0.00 572.18 0.00 573.20 2.65 571.18 0.00 572.20 0.00 573.22 2.70 571.20 0.00 572.22 0.00 573.24 2.75 571.22 0.00 572.24 0.00 573.26 2.80 571.24 0.00 572.26 0.00 573.28 2.85 571.26 0.00 572.28 0.00 573.30 2.89 571.28 0.00 572.30 0.00 573.32 2.94 571.30 0.00 572.32 0.00 573.34 2.98 571.32 0.00 572.34 0.00 573.36 3.03 571.34 0.00 572.36 0.00 573.38 3.07 571.36 0.00 572.38 0.00 573.40 3.11 571.38 0.00 572.40 0.00 573.42 3.15 571.40 0.00 572.42 0.01 573.44 3.20 571.42 0.00 572.44 0.04 573.46 3.24 571.44 0.00 572.46 0.07 573.48 3.28 571.46 0.00 572.48 0.11 573.50

571.42 0.00 572.44 0.04 573.46 3.24 571.44 0.00 572.46 0.07 573.48 3.28 571.46 0.00 572.48 0.11 573.50 3.32 571.48 0.00 572.50 0.15 573.52 3.36 571.50 0.00 572.52 0.20 573.54 3.40

Basin 5 witout exfiltration Proposed basin 5 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 24P: Infiltration basin 5 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 570.50 12,410 0 573.05 12,410 31,645 570.55 12,410 620 573.10 12,410 32,266 570.60 12,410 1,241 573.15 12,410 32,886 570.65 12,410 1,861 573.20 12,410 33,507 570.70 12,410 2,482 573.25 12,410 34,128 570.75 12,410 3,103 573.30 12,410 34,748 570.80 12,410 3,723 573.35 12,410 35,369 570.85 12,410 4,344 573.40 12,410 35,989 570.90 12,410 4,964 573.45 12,410 36,610 570.95 12,410 5,585 573.50 12,410 37,230 571.00 12,410 6,205 573.55 12,410 37,850 571.05 12,410 6,825 573.60 12,410 38,471 571.10 12,410 7,446 573.65 12,410 39,091 571.15 12,410 8,066 573.70 12,410 39,712 571.20 12,410 8,687 573.75 12,410 40,333 571.25 12,410 9,308 573.80 12,410 40,953 571.30 12,410 9,928 573.85 12,410 41,574 571.35 12,410 10,549 573.90 12,410 42,194 571.40 12,410 11,169 573.95 12,410 42,815 571.45 12,410 11,790 574.00 12,410 43,435 571.50 12,410 12,410 571.55 12,410 13,030 571.60 12,410 13,651 571.65 12,410 14,271 571.70 12,410

43,435 571.50 12,410 12,410 571.55 12,410 13,030 571.60 12,410 13,651 571.65 12,410 14,271 571.70 12,410 14,892 571.75 12,410 15,513 571.80 12,410 16,133 571.85 12,410 16,754 571.90 12,410 17,374 571.95 12,410 17,995 572.00 12,410 18,615 572.05 12,410 19,235 572.10 12,410 19,856 572.15 12,410 20,476 572.20 12,410 21,097 572.25 12,410 21,718 572.30 12,410 22,338 572.35 12,410 22,959 572.40 12,410 23,579 572.45 12,410 24,200 572.50 12,410 24,820 572.55 12,410 25,440 572.60 12,410 26,061 572.65 12,410 26,681 572.70 12,410 27,302 572.75 12,410 27,923 572.80 12,410 28,543 572.85 12,410 29,164 572.90 12,410 29,784 572.95 12,410 30,405 573.00 12,410 31,025

Basin 5 witout exfiltration Proposed basin 5 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=0.03 hrs, 2401 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 23S: Basin 5 Runoff Area=99,084 sf Runoff Depth=7.34" Flow Length=314' Tc=11.3 min CN=74/98 Runoff=14.33 cfs 1.392 af Subcatchment 25S: overland 5-A Runoff Area=68,635 sf Runoff Depth=6.46" Flow Length=394' Tc=7.6 min CN=74/98 Runoff=10.39 cfs 0.848 af Subcatchment 26S: pre-dev basin 5 Runoff Area=167,719 sf Runoff Depth=5.04" Flow Length=274' Tc=11.5 min CN=70/0 Runoff=18.50 cfs 1.616 af Pond 24P: Infiltration basin 5 Peak Elev=573.29' Storage=34,562 cf Inflow=14.33 cfs 1.392 af Outflow=2.86 cfs 0.851 af Total Runoff Area = 7.701 ac Runoff Volume = 3.856 af Average Runoff Depth = 6.01"

Basin 5 witout exfiltration Proposed basin 5 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 34 Summary for Subcatchment 23S: Basin 5 Runoff = 14.33 cfs @ 12.18 hrs, Volume= 1.392 af, Depth= 7.34" Routed to Pond 24P : Infiltration basin 5 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 100-Year Rainfall=8.66" Area (sf) CN Description 62,281 98 Roofs, HSG D 36,803 74 >75% Grass cover, Good, HSG C 99,084 89 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.0170 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 1.0 164 0.0305 2.62 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.1 50 0.0760 5.60 Shallow Concentrated Flow, Paved Kv= 20.3 fps 11.3 314 Total Subcatchment 23S: Basin 5 Hydrograph 16 Runoff 15 14.33 cfs 14 NOAA 24-hr D 13 100-Year Rainfall=8.66" 12 11