Drainage Report

Basin 2-4 without exfiltration Proposed Basin 2-4 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 26 Pond 43P: pond 2-4 Hydrograph Inflow 7.12 cfs Primary 7 Inflow Area=2.205 ac Peak Elev=543.52' 6 Storage=16,883 cf 5 Flow (cfs) 4 3 2 1 0.62 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 2-4 without exfiltration Proposed Basin 2-4 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 Pond 43P: pond 2-4 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 542.00 0.00 2.50 0.02 83 542.01 0.00 5.00 0.04 399 542.04 0.00 7.50 0.07 887 542.08 0.00 10.00 0.23 2,063 542.19 0.00 12.50 2.04 14,919 543.35 0.42 15.00 0.34 16,208 543.46 0.54 17.50 0.21 14,512 543.31 0.37 20.00 0.16 13,407 543.21 0.24 22.50 0.13 12,859 543.16 0.18 25.00 0.00 12,208 543.10 0.11 27.50 0.00 11,495 543.04 0.05 30.00 0.00 11,115 543.00 0.03 32.50 0.00 10,882 542.98 0.02 35.00 0.00 10,724 542.97 0.01 37.50 0.00 10,615 542.96 0.01 40.00 0.00 10,530 542.95 0.01 42.50 0.00 10,460 542.94 0.01 45.00 0.00 10,403 542.94 0.01 47.50 0.00 10,356 542.93 0.00 50.00 0.00 10,318 542.93 0.00 52.50 0.00 10,287 542.93 0.00 55.00 0.00 10,261 542.93 0.00 57.50 0.00 10,240 542.92 0.00 60.00 0.00 10,223 542.92 0.00 62.50 0.00 10,209 542.92 0.00 65.00 0.00 10,197 542.92 0.00 67.50 0.00 10,187 542.92 0.00 70.00 0.00 10,176 542.92 0.00

Basin 2-4 without exfiltration Proposed Basin 2-4 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 Stage-Discharge for Pond 43P: pond 2-4 Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 542.00 0.00 543.02 0.04 544.04 1.48 545.06 2.43 542.02 0.00 543.04 0.06 544.06 1.51 545.08 2.44 542.04 0.00 543.06 0.07 544.08 1.53 545.10 2.46 542.06 0.00 543.08 0.09 544.10 1.56 545.12 2.47 542.08 0.00 543.10 0.11 544.12 1.58 545.14 2.49 542.10 0.00 543.12 0.13 544.14 1.60 545.16 2.50 542.12 0.00 543.14 0.16 544.16 1.63 545.18 2.52 542.14 0.00 543.16 0.18 544.18 1.65 545.20 2.53 542.16 0.00 543.18 0.20 544.20 1.67 545.22 2.54 542.18 0.00 543.20 0.23 544.22 1.69 545.24 2.56 542.20 0.00 543.22 0.26 544.24 1.71 545.26 2.57 542.22 0.00 543.24 0.28 544.26 1.73 545.28 2.59 542.24 0.00 543.26 0.31 544.28 1.76 545.30 2.60 542.26 0.00 543.28 0.34 544.30 1.78 545.32 2.61 542.28 0.00 543.30 0.36 544.32 1.80 545.34 2.63 542.30 0.00 543.32 0.39 544.34 1.82 545.36 2.64 542.32 0.00 543.34 0.41 544.36 1.84 545.38 2.66 542.34 0.00 543.36 0.44 544.38 1.86 545.40 2.67 542.36 0.00 543.38 0.46 544.40 1.88

.84 545.38 2.66 542.34 0.00 543.36 0.44 544.38 1.86 545.40 2.67 542.36 0.00 543.38 0.46 544.40 1.88 545.42 2.68 542.38 0.00 543.40 0.47 544.42 1.90 545.44 2.70 542.40 0.00 543.42 0.49 544.44 1.91 545.46 2.71 542.42 0.00 543.44 0.51 544.46 1.93 545.48 2.72 542.44 0.00 543.46 0.54 544.48 1.95 545.50 2.74 542.46 0.00 543.48 0.56 544.50 1.97 545.52 2.75 542.48 0.00 543.50 0.59 544.52 1.99 545.54 2.76 542.50 0.00 543.52 0.62 544.54 2.01 545.56 2.77 542.52 0.00 543.54 0.65 544.56 2.02 545.58 2.79 542.54 0.00 543.56 0.68 544.58 2.04 545.60 2.80 542.56 0.00 543.58 0.71 544.60 2.06 545.62 2.81 542.58 0.00 543.60 0.75 544.62 2.08 545.64 2.83 542.60 0.00 543.62 0.78 544.64 2.09 545.66 2.84 542.62 0.00 543.64 0.82 544.66 2.11 545.68 2.85 542.64 0.00 543.66 0.85 544.68 2.13 545.70 2.86 542.66 0.00 543.68 0.89 544.70 2.15 545.72 2.88 542.68 0.00 543.70 0.93 544.72 2.16 545.74 2.89 542.70 0.00 543.72 0.97 544.74 2.18 545.76 2.90 542.72 0.00 543.74 1.01 544.76 2.20 545.78 2.91 542.74 0.00 543.76 1.05 544.78 2.21 545.80 2.93 542.76 0.00 543.78 1.09 544.80 2.23 545.82 2.94 542.78 0.00 543.80 1.12 544.82 2.24 545.84 2.95 542.80 0.00 543.82 1.16 544.84 2.26 545.86 2.96 542.82 0.00 543.84 1.20 544.86

2 2.24 545.84 2.95 542.80 0.00 543.82 1.16 544.84 2.26 545.86 2.96 542.82 0.00 543.84 1.20 544.86 2.28 545.88 2.97 542.84 0.00 543.86 1.23 544.88 2.29 545.90 2.99 542.86 0.00 543.88 1.26 544.90 2.31 545.92 3.00 542.88 0.00 543.90 1.29 544.92 2.32 545.94 3.01 542.90 0.00 543.92 1.32 544.94 2.34 545.96 3.02 542.92 0.00 543.94 1.35 544.96 2.35 545.98 3.03 542.94 0.01 543.96 1.38 544.98 2.37 546.00 3.05 542.96 0.01 543.98 1.40 545.00 2.38 542.98 0.02 544.00 1.43 545.02 2.40 543.00 0.03 544.02 1.46 545.04 2.41

Basin 2-4 without exfiltration Proposed Basin 2-4 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 Stage-Area-Storage for Pond 43P: pond 2-4 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 542.00 11,090 0 544.55 11,090 28,279 542.05 11,090 554 544.60 11,090 28,834 542.10 11,090 1,109 544.65 11,090 29,388 542.15 11,090 1,663 544.70 11,090 29,943 542.20 11,090 2,218 544.75 11,090 30,498 542.25 11,090 2,773 544.80 11,090 31,052 542.30 11,090 3,327 544.85 11,090 31,607 542.35 11,090 3,882 544.90 11,090 32,161 542.40 11,090 4,436 544.95 11,090 32,716 542.45 11,090 4,991 545.00 11,090 33,270 542.50 11,090 5,545 545.05 11,090 33,824 542.55 11,090 6,099 545.10 11,090 34,379 542.60 11,090 6,654 545.15 11,090 34,933 542.65 11,090 7,208 545.20 11,090 35,488 542.70 11,090 7,763 545.25 11,090 36,043 542.75 11,090 8,318 545.30 11,090 36,597 542.80 11,090 8,872 545.35 11,090 37,152 542.85 11,090 9,427 545.40 11,090 37,706 542.90 11,090 9,981 545.45 11,090 38,261 542.95 11,090 10,536 545.50 11,090 38,815 543.00 11,090 11,090 545.55 11,090 39,369 543.05 11,090 11,644 545.60 11,090 39,924 543.10 11,090

38,815 543.00 11,090 11,090 545.55 11,090 39,369 543.05 11,090 11,644 545.60 11,090 39,924 543.10 11,090 12,199 545.65 11,090 40,478 543.15 11,090 12,753 545.70 11,090 41,033 543.20 11,090 13,308 545.75 11,090 41,588 543.25 11,090 13,863 545.80 11,090 42,142 543.30 11,090 14,417 545.85 11,090 42,697 543.35 11,090 14,972 545.90 11,090 43,251 543.40 11,090 15,526 545.95 11,090 43,806 543.45 11,090 16,081 546.00 11,090 44,360 543.50 11,090 16,635 543.55 11,090 17,189 543.60 11,090 17,744 543.65 11,090 18,298 543.70 11,090 18,853 543.75 11,090 19,408 543.80 11,090 19,962 543.85 11,090 20,517 543.90 11,090 21,071 543.95 11,090 21,626 544.00 11,090 22,180 544.05 11,090 22,734 544.10 11,090 23,289 544.15 11,090 23,843 544.20 11,090 24,398 544.25 11,090 24,953 544.30 11,090 25,507 544.35 11,090 26,062 544.40 11,090 26,616 544.45 11,090 27,171 544.50 11,090 27,725

Basin 2-4 without exfiltration Proposed Basin 2-4 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 30 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 38S: Basin 2-4 Runoff Area=96,037 sf Runoff Depth=6.65" Flow Length=1,912' Tc=10.1 min CN=78/98 Runoff=13.54 cfs 1.223 af Subcatchment 45S: Basin 2-4 pe-development Runoff Area=96,036 sf Runoff Depth=5.04" Flow Length=390' Tc=18.0 min CN=70/0 Runoff=8.80 cfs 0.925 af Pond 43P: pond 2-4 Peak Elev=544.61' Storage=28,898 cf Inflow=13.54 cfs 1.223 af Outflow=2.06 cfs 0.989 af Total Runoff Area = 4.409 ac Runoff Volume = 2.148 af Average Runoff Depth = 5.85"

Basin 2-4 without exfiltration Proposed Basin 2-4 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 31 Summary for Subcatchment 38S: Basin 2-4 [47] Hint: Peak is 497% of capacity of segment #3 Runoff = 13.54 cfs @ 12.17 hrs, Volume= 1.223 af, Depth= 6.65" Routed to Pond 43P : pond 2-4 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 100-Year Rainfall=8.66" Area (sf) CN Description 26,461 98 Roofs, HSG C 11,090 98 Water Surface, 0% imp, HSG C 58,486 74 >75% Grass cover, Good, HSG C 96,037 83 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.4 100 0.0800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.9 120 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 3.7 1,692 0.0390 7.60 2.72 Pipe Channel, pipe to basin 15.0" Round w/ 10.0" inside fill Area= 0.4 sf Perim= 2.7' r= 0.13' n= 0.010 10.1 1,912 Total

Basin 2-4 without exfiltration Proposed Basin 2-4 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 32 Subcatchment 38S: Basin 2-4 Hydrograph 15 Runoff 14 13.54 cfs 13 NOAA 24-hr D 12 100-Year Rainfall=8.66" 11 Runoff Area=96,037 sf 10 9 Runoff Volume=1.223 af Flow (cfs) 8 Runoff Depth=6.65" 7 Flow Length=1,912' 6 5 Tc=10.1 min 4 CN=78/98 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)