Drainage Report

Basin 2-6 without exfiltration Proposed basin 2-6 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 Hydrograph for Pond 37P: Pond 2-6 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 540.50 0.00 2.50 0.03 85 540.51 0.00 5.00 0.08 591 540.55 0.00 7.50 0.13 1,472 540.64 0.00 10.00 0.27 3,098 540.79 0.00 12.50 1.37 13,488 541.75 0.00 15.00 0.22 16,780 542.06 0.18 17.50 0.13 16,703 542.05 0.17 20.00 0.10 16,362 542.02 0.13 22.50 0.08 16,112 541.99 0.11 25.00 0.00 15,717 541.96 0.07 27.50 0.00 15,239 541.91 0.04 30.00 0.00 14,965 541.89 0.02 32.50 0.00 14,786 541.87 0.02 35.00 0.00 14,665 541.86 0.01 37.50 0.00 14,572 541.85 0.01 40.00 0.00 14,499 541.84 0.01 42.50 0.00 14,442 541.84 0.01 45.00 0.00 14,398 541.84 0.00 47.50 0.00 14,363 541.83 0.00 50.00 0.00 14,335 541.83 0.00 52.50 0.00 14,311 541.83 0.00 55.00 0.00 14,288 541.83 0.00 57.50 0.00 14,268 541.82 0.00 60.00 0.00 14,249 541.82 0.00 62.50 0.00 14,231 541.82 0.00 65.00 0.00 14,215 541.82 0.00 67.50 0.00 14,200 541.82 0.00 70.00 0.00 14,186 541.82 0.00

Basin 2-6 without exfiltration Proposed basin 2-6 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 Stage-Discharge for Pond 37P: Pond 2-6 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 0.66 543.56 1.16 540.52 0.00 541.54 0.00 542.56 0.68 543.58 1.17 540.54 0.00 541.56 0.00 542.58 0.69 543.60 1.18 540.56 0.00 541.58 0.00 542.60 0.70 543.62 1.18 540.58 0.00 541.60 0.00 542.62 0.71 543.64 1.19 540.60 0.00 541.62 0.00 542.64 0.73 543.66 1.20 540.62 0.00 541.64 0.00 542.66 0.74 543.68 1.21 540.64 0.00 541.66 0.00 542.68 0.75 543.70 1.21 540.66 0.00 541.68 0.00 542.70 0.76 543.72 1.22 540.68 0.00 541.70 0.00 542.72 0.77 543.74 1.23 540.70 0.00 541.72 0.00 542.74 0.79 543.76 1.24 540.72 0.00 541.74 0.00 542.76 0.80 543.78 1.24 540.74 0.00 541.76 0.00 542.78 0.81 543.80 1.25 540.76 0.00 541.78 0.00 542.80 0.82 543.82 1.26 540.78 0.00 541.80 0.00 542.82 0.83 543.84 1.26 540.80 0.00 541.82 0.00 542.84 0.84 543.86 1.27 540.82 0.00 541.84 0.01 542.86 0.85 543.88 1.28 540.84 0.00 541.86 0.01 542.88 0.86 543.90 1.29 540.86 0.00 541.88 0.02 542.90 0.87

.85 543.88 1.28 540.84 0.00 541.86 0.01 542.88 0.86 543.90 1.29 540.86 0.00 541.88 0.02 542.90 0.87 543.92 1.29 540.88 0.00 541.90 0.03 542.92 0.88 543.94 1.30 540.90 0.00 541.92 0.04 542.94 0.89 543.96 1.31 540.92 0.00 541.94 0.06 542.96 0.90 543.98 1.31 540.94 0.00 541.96 0.07 542.98 0.91 544.00 1.32 540.96 0.00 541.98 0.09 543.00 0.92 540.98 0.00 542.00 0.11 543.02 0.93 541.00 0.00 542.02 0.13 543.04 0.94 541.02 0.00 542.04 0.16 543.06 0.95 541.04 0.00 542.06 0.18 543.08 0.96 541.06 0.00 542.08 0.20 543.10 0.97 541.08 0.00 542.10 0.23 543.12 0.98 541.10 0.00 542.12 0.26 543.14 0.99 541.12 0.00 542.14 0.28 543.16 1.00 541.14 0.00 542.16 0.31 543.18 1.00 541.16 0.00 542.18 0.34 543.20 1.01 541.18 0.00 542.20 0.36 543.22 1.02 541.20 0.00 542.22 0.39 543.24 1.03 541.22 0.00 542.24 0.41 543.26 1.04 541.24 0.00 542.26 0.44 543.28 1.05 541.26 0.00 542.28 0.46 543.30 1.06 541.28 0.00 542.30 0.47 543.32 1.07 541.30 0.00 542.32 0.49 543.34 1.07 541.32 0.00 542.34 0.51 543.36 1.08 541.34 0.00 542.36 0.53 543.38 1.09 541.36 0.00 542.38 0.54 543.40 1.10 541.38 0.00 542.40 0.56 543.42 1.11 541.40 0.00 542.42 0.58 543.44 1.11 541.42 0.00 542.44 0.59 543.46 1.12 541.44 0.00 542.46 0.61 543.48 1.13 541.46 0.00 542.48 0.62 543.50

541.42 0.00 542.44 0.59 543.46 1.12 541.44 0.00 542.46 0.61 543.48 1.13 541.46 0.00 542.48 0.62 543.50 1.14 541.48 0.00 542.50 0.63 543.52 1.15 541.50 0.00 542.52 0.65 543.54 1.15

Basin 2-6 without exfiltration Proposed basin 2-6 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 Stage-Area-Storage for Pond 37P: Pond 2-6 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 540.50 10,782 0 543.05 10,782 27,494 540.55 10,782 539 543.10 10,782 28,033 540.60 10,782 1,078 543.15 10,782 28,572 540.65 10,782 1,617 543.20 10,782 29,111 540.70 10,782 2,156 543.25 10,782 29,651 540.75 10,782 2,696 543.30 10,782 30,190 540.80 10,782 3,235 543.35 10,782 30,729 540.85 10,782 3,774 543.40 10,782 31,268 540.90 10,782 4,313 543.45 10,782 31,807 540.95 10,782 4,852 543.50 10,782 32,346 541.00 10,782 5,391 543.55 10,782 32,885 541.05 10,782 5,930 543.60 10,782 33,424 541.10 10,782 6,469 543.65 10,782 33,963 541.15 10,782 7,008 543.70 10,782 34,502 541.20 10,782 7,547 543.75 10,782 35,042 541.25 10,782 8,087 543.80 10,782 35,581 541.30 10,782 8,626 543.85 10,782 36,120 541.35 10,782 9,165 543.90 10,782 36,659 541.40 10,782 9,704 543.95 10,782 37,198 541.45 10,782 10,243 544.00 10,782 37,737 541.50 10,782 10,782 541.55 10,782 11,321 541.60 10,782 11,860 541.65 10,782 12,399 541.70 10,782

37,737 541.50 10,782 10,782 541.55 10,782 11,321 541.60 10,782 11,860 541.65 10,782 12,399 541.70 10,782 12,938 541.75 10,782 13,478 541.80 10,782 14,017 541.85 10,782 14,556 541.90 10,782 15,095 541.95 10,782 15,634 542.00 10,782 16,173 542.05 10,782 16,712 542.10 10,782 17,251 542.15 10,782 17,790 542.20 10,782 18,329 542.25 10,782 18,869 542.30 10,782 19,408 542.35 10,782 19,947 542.40 10,782 20,486 542.45 10,782 21,025 542.50 10,782 21,564 542.55 10,782 22,103 542.60 10,782 22,642 542.65 10,782 23,181 542.70 10,782 23,720 542.75 10,782 24,260 542.80 10,782 24,799 542.85 10,782 25,338 542.90 10,782 25,877 542.95 10,782 26,416 543.00 10,782 26,955

Basin 2-6 without exfiltration Proposed basin 2-6 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 18 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 36S: Basin 2-6 Runoff Area=80,223 sf Runoff Depth=4.98" Flow Length=1,762' Tc=10.0 min CN=98/98 Runoff=7.83 cfs 0.765 af Subcatchment 42S: basin 2-6 pre-development Runoff Area=80,223 sf Runoff Depth=2.20" Flow Length=230' Tc=17.3 min CN=70/0 Runoff=3.23 cfs 0.338 af Pond 37P: Pond 2-6 Peak Elev=542.57' Storage=22,303 cf Inflow=7.83 cfs 0.765 af Outflow=0.68 cfs 0.439 af Total Runoff Area = 3.683 ac Runoff Volume = 1.103 af Average Runoff Depth = 3.59"

Basin 2-6 without exfiltration Proposed basin 2-6 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 19 Summary for Subcatchment 36S: Basin 2-6 [47] Hint: Peak is 449% of capacity of segment #3 Runoff = 7.83 cfs @ 12.17 hrs, Volume= 0.765 af, Depth= 4.98" Routed to Pond 37P : Pond 2-6 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 10-Year Rainfall=5.22" Area (sf) CN Description 69,441 98 Roofs, HSG C 10,782 98 Water Surface, 0% imp, HSG C 80,223 98 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.5 100 0.0100 1.08 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 0.3 40 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 4.8 1,622 0.0370 5.63 1.74 Pipe Channel, 12.0" Round w/ 7.0" inside fill Area= 0.3 sf Perim= 2.4' r= 0.13' n= 0.013 6.7 1,762 Total, Increased to minimum Tc = 10.0 min Subcatchment 36S: Basin 2-6 Hydrograph Runoff 7.83 cfs 8

Runoff 7.83 cfs 8 NOAA 24-hr D 7 10-Year Rainfall=5.22" 6 Runoff Area=80,223 sf Runoff Volume=0.765 af 5 Flow (cfs) Runoff Depth=4.98" 4 Flow Length=1,762' 3 Tc=10.0 min CN=98/98 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)

Basin 2-6 without exfiltration Proposed basin 2-6 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 20 Hydrograph for Subcatchment 36S: Basin 2-6 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 0.04 0.04 0.08 5.00 0.36 0.19 0.19 0.13 7.50 0.61 0.42 0.42 0.21 10.00 1.03 0.82 0.82 0.42 12.50 3.57 3.33 3.33 2.08 15.00 4.39 4.16 4.16 0.33 17.50 4.73 4.49 4.49 0.20 20.00 4.95 4.71 4.71 0.15 22.50 5.13 4.89 4.89 0.12 25.00 5.22 4.98 4.98 0.00 27.50 5.22 4.98 4.98 0.00 30.00 5.22 4.98 4.98 0.00 32.50 5.22 4.98 4.98 0.00 35.00 5.22 4.98 4.98 0.00 37.50 5.22 4.98 4.98 0.00 40.00 5.22 4.98 4.98 0.00 42.50 5.22 4.98 4.98 0.00 45.00 5.22 4.98 4.98 0.00 47.50 5.22 4.98 4.98 0.00 50.00 5.22 4.98 4.98 0.00 52.50 5.22 4.98 4.98 0.00 55.00 5.22 4.98 4.98 0.00 57.50 5.22 4.98 4.98 0.00 60.00 5.22 4.98 4.98 0.00 62.50 5.22 4.98 4.98 0.00 65.00 5.22 4.98 4.98 0.00 67.50 5.22 4.98 4.98 0.00 70.00 5.22 4.98 4.98 0.00