Drainage Report

Basin 2-5 without exfiltration Proposed Basin 2-5 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 22 Hydrograph for Subcatchment 42S: Basin 2-5 predevelopment 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 0.02 12.50 3.57 1.05 0.00 1.32 15.00 4.39 1.60 0.00 0.21 17.50 4.73 1.83 0.00 0.13 20.00 4.95 2.00 0.00 0.10 22.50 5.13 2.13 0.00 0.08 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 2-5 without exfiltration Proposed Basin 2-5 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 23 Summary for Pond 39P: pond 2-5 Inflow Area = 1.650 ac, Inflow Depth = 4.98" for 10-Year event Inflow = 7.02 cfs @ 12.17 hrs, Volume= 0.685 af Outflow = 0.64 cfs @ 13.37 hrs, Volume= 0.415 af, Atten= 91%, Lag= 72.0 min Primary = 0.64 cfs @ 13.37 hrs, Volume= 0.415 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 542.21' @ 13.37 hrs Surf.Area= 11,558 sf Storage= 19,784 cf Plug-Flow detention time= 486.9 min calculated for 0.415 af (61% of inflow) Center-of-Mass det. time= 365.6 min ( 1,117.8 - 752.2 ) Volume Invert Avail.Storage Storage Description #1 540.50' 40,453 cf 540 (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 11,558 0 0 544.00 11,558 40,453 40,453 Device Routing Invert Outlet Devices #1 Primary 541.50' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.64 cfs @ 13.37 hrs HW=542.21' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.64 cfs @ 3.27 fps)

Basin 2-5 without exfiltration Proposed Basin 2-5 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 24 Pond 39P: pond 2-5 Hydrograph Inflow 7.02 cfs Primary 7 Inflow Area=1.650 ac 6 Peak Elev=542.21' Storage=19,784 cf 5 Flow (cfs) 4 3 2 1 0.64 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 2-5 without exfiltration Proposed Basin 2-5 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 25 Hydrograph for Pond 39P: pond 2-5 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 540.50 0.00 2.50 0.07 226 540.52 0.00 5.00 0.12 1,084 540.59 0.00 7.50 0.19 2,406 540.71 0.00 10.00 0.38 4,725 540.91 0.00 12.50 1.86 18,470 542.10 0.56 15.00 0.30 18,651 542.11 0.57 17.50 0.18 16,385 541.92 0.39 20.00 0.13 15,044 541.80 0.23 22.50 0.11 14,406 541.75 0.16 25.00 0.00 13,769 541.69 0.10 27.50 0.00 13,102 541.63 0.05 30.00 0.00 12,733 541.60 0.03 32.50 0.00 12,503 541.58 0.02 35.00 0.00 12,344 541.57 0.02 37.50 0.00 12,227 541.56 0.01 40.00 0.00 12,143 541.55 0.01 42.50 0.00 12,077 541.54 0.01 45.00 0.00 12,021 541.54 0.01 47.50 0.00 11,973 541.54 0.00 50.00 0.00 11,931 541.53 0.00 52.50 0.00 11,896 541.53 0.00 55.00 0.00 11,866 541.53 0.00 57.50 0.00 11,841 541.52 0.00 60.00 0.00 11,819 541.52 0.00 62.50 0.00 11,800 541.52 0.00 65.00 0.00 11,784 541.52 0.00 67.50 0.00 11,771 541.52 0.00 70.00 0.00 11,759 541.52 0.00

Basin 2-5 without exfiltration Proposed Basin 2-5 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 26 Stage-Discharge for Pond 39P: pond 2-5 Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 540.50 0.00 541.52 0.00 542.54 0.84 543.56 1.27 540.52 0.00 541.54 0.01 542.56 0.85 543.58 1.28 540.54 0.00 541.56 0.01 542.58 0.86 543.60 1.29 540.56 0.00 541.58 0.02 542.60 0.87 543.62 1.29 540.58 0.00 541.60 0.03 542.62 0.88 543.64 1.30 540.60 0.00 541.62 0.04 542.64 0.89 543.66 1.31 540.62 0.00 541.64 0.06 542.66 0.90 543.68 1.31 540.64 0.00 541.66 0.07 542.68 0.91 543.70 1.32 540.66 0.00 541.68 0.09 542.70 0.92 543.72 1.33 540.68 0.00 541.70 0.11 542.72 0.93 543.74 1.33 540.70 0.00 541.72 0.13 542.74 0.94 543.76 1.34 540.72 0.00 541.74 0.16 542.76 0.95 543.78 1.35 540.74 0.00 541.76 0.18 542.78 0.96 543.80 1.35 540.76 0.00 541.78 0.20 542.80 0.97 543.82 1.36 540.78 0.00 541.80 0.23 542.82 0.98 543.84 1.37 540.80 0.00 541.82 0.26 542.84 0.99 543.86 1.37 540.82 0.00 541.84 0.28 542.86 1.00 543.88 1.38 540.84 0.00 541.86 0.31 542.88 1.00 543.90 1.39 540.86 0.00 541.88 0.34 542.90 1.01

.00 543.88 1.38 540.84 0.00 541.86 0.31 542.88 1.00 543.90 1.39 540.86 0.00 541.88 0.34 542.90 1.01 543.92 1.39 540.88 0.00 541.90 0.36 542.92 1.02 543.94 1.40 540.90 0.00 541.92 0.39 542.94 1.03 543.96 1.41 540.92 0.00 541.94 0.41 542.96 1.04 543.98 1.41 540.94 0.00 541.96 0.44 542.98 1.05 544.00 1.42 540.96 0.00 541.98 0.46 543.00 1.06 540.98 0.00 542.00 0.47 543.02 1.07 541.00 0.00 542.02 0.49 543.04 1.07 541.02 0.00 542.04 0.51 543.06 1.08 541.04 0.00 542.06 0.53 543.08 1.09 541.06 0.00 542.08 0.54 543.10 1.10 541.08 0.00 542.10 0.56 543.12 1.11 541.10 0.00 542.12 0.58 543.14 1.11 541.12 0.00 542.14 0.59 543.16 1.12 541.14 0.00 542.16 0.61 543.18 1.13 541.16 0.00 542.18 0.62 543.20 1.14 541.18 0.00 542.20 0.63 543.22 1.15 541.20 0.00 542.22 0.65 543.24 1.15 541.22 0.00 542.24 0.66 543.26 1.16 541.24 0.00 542.26 0.68 543.28 1.17 541.26 0.00 542.28 0.69 543.30 1.18 541.28 0.00 542.30 0.70 543.32 1.18 541.30 0.00 542.32 0.71 543.34 1.19 541.32 0.00 542.34 0.73 543.36 1.20 541.34 0.00 542.36 0.74 543.38 1.21 541.36 0.00 542.38 0.75 543.40 1.21 541.38 0.00 542.40 0.76 543.42 1.22 541.40 0.00 542.42 0.77 543.44 1.23 541.42 0.00 542.44 0.79 543.46 1.24 541.44 0.00 542.46 0.80 543.48 1.24 541.46 0.00 542.48 0.81 543.50

541.42 0.00 542.44 0.79 543.46 1.24 541.44 0.00 542.46 0.80 543.48 1.24 541.46 0.00 542.48 0.81 543.50 1.25 541.48 0.00 542.50 0.82 543.52 1.26 541.50 0.00 542.52 0.83 543.54 1.26

Basin 2-5 without exfiltration Proposed Basin 2-5 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 27 Stage-Area-Storage for Pond 39P: pond 2-5 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 540.50 11,558 0 543.05 11,558 29,473 540.55 11,558 578 543.10 11,558 30,051 540.60 11,558 1,156 543.15 11,558 30,629 540.65 11,558 1,734 543.20 11,558 31,207 540.70 11,558 2,312 543.25 11,558 31,785 540.75 11,558 2,890 543.30 11,558 32,362 540.80 11,558 3,467 543.35 11,558 32,940 540.85 11,558 4,045 543.40 11,558 33,518 540.90 11,558 4,623 543.45 11,558 34,096 540.95 11,558 5,201 543.50 11,558 34,674 541.00 11,558 5,779 543.55 11,558 35,252 541.05 11,558 6,357 543.60 11,558 35,830 541.10 11,558 6,935 543.65 11,558 36,408 541.15 11,558 7,513 543.70 11,558 36,986 541.20 11,558 8,091 543.75 11,558 37,564 541.25 11,558 8,669 543.80 11,558 38,141 541.30 11,558 9,246 543.85 11,558 38,719 541.35 11,558 9,824 543.90 11,558 39,297 541.40 11,558 10,402 543.95 11,558 39,875 541.45 11,558 10,980 544.00 11,558 40,453 541.50 11,558 11,558 541.55 11,558 12,136 541.60 11,558 12,714 541.65 11,558 13,292 541.70 11,558

40,453 541.50 11,558 11,558 541.55 11,558 12,136 541.60 11,558 12,714 541.65 11,558 13,292 541.70 11,558 13,870 541.75 11,558 14,448 541.80 11,558 15,025 541.85 11,558 15,603 541.90 11,558 16,181 541.95 11,558 16,759 542.00 11,558 17,337 542.05 11,558 17,915 542.10 11,558 18,493 542.15 11,558 19,071 542.20 11,558 19,649 542.25 11,558 20,227 542.30 11,558 20,804 542.35 11,558 21,382 542.40 11,558 21,960 542.45 11,558 22,538 542.50 11,558 23,116 542.55 11,558 23,694 542.60 11,558 24,272 542.65 11,558 24,850 542.70 11,558 25,428 542.75 11,558 26,006 542.80 11,558 26,583 542.85 11,558 27,161 542.90 11,558 27,739 542.95 11,558 28,317 543.00 11,558 28,895

Basin 2-5 without exfiltration Proposed Basin 2-5 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 28 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 2-5 Runoff Area=71,875 sf Runoff Depth=8.42" Flow Length=1,020' Tc=10.0 min CN=98/98 Runoff=11.68 cfs 1.158 af Subcatchment 42S: Basin 2-5 predevelopment Runoff Area=71,875 sf Runoff Depth=5.04" Flow Length=220' Tc=13.2 min CN=70/0 Runoff=7.48 cfs 0.693 af Pond 39P: pond 2-5 Peak Elev=543.27' Storage=31,977 cf Inflow=11.68 cfs 1.158 af Outflow=1.16 cfs 0.888 af Total Runoff Area = 3.300 ac Runoff Volume = 1.850 af Average Runoff Depth = 6.73"