2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC Pond 6P: Basin D Stage-Area-Storage ‘Surfacalorzontal Vetted Aros (sat ‘9.290 409 690 800 1,000 1,200 1,400 1,600 1,800 2,000 2.200 2.400 2,600 2.00 3,000 3.200 3.400 600 3,800, ES on = Cisien Sta Data ors ‘0 a0 1,000 1,300 21000 2800 3600 8.500 4,000 4.300 500 5,00 6.900 6.500 7.000 7,200 8.000 8500 ‘Storage cublefeot) 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=6.22" Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC Page 100 Hydrograph for Pond 6P: Basin D Time Inflow Storage Elevation (cubic-feet) (feet)

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 9/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2¢_s/n 08640 © 2021 HydroCAD Software Solutions LLC il HydroCAD® 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 102 Stage-Discharge for Pond 6P: Basin D Stage-Area-Storage for Pond 6P: Basin D Elevation Primary, Elevation Primary Elevation Primary Elevation Storage Elevation ‘Surface ‘Storage feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cubic-feet) i 615,00 0.00 616.04 0.00 617.08 4.28 615.00 0 615.02 0,00 616.06 0.00 617.10 1.30 615.05 98 615.04 0.00 616.08 0.00 617.12 1,32 615.10 198 615.06 0.00 616.10 0.00 617.14 1.34 615.15 299 615.08 0.00 616.12 0.00 617.16 1.37 615.20 402 615.10 0.00 616.14 0.00 617.18 1.39 615.25 506 615.12 0,00 616.16 0.00 617.20 1.44 615.30 611 615.14 0.00 616.18 0.00 617.22 1.43 615.35 718 615.16 0.00 616.20 0.00 617.24 1.45 615.40 826 615.18 0.00 616,22 0,00 617.26 1.47 615.45 935 615.20 0.00 616.24 0.00 617.28 148 615.50 1,047 615,22 0,00 616.26 0.00 617.30 1,50 615.55 1,159 615.24 0.00 616.28 0.00 617.32 1.52 615.60 1,273 615.26 0.00 616.30 0.00 617.34 1.54 615.65 1,368 615.28 0.00 616.32 0.00 617.36 1.56 615.70 1,505 615.30 0.00 616.34 0.00 617.38 1.58 615.75 1,623 615.32 0.00 616.36 0.00 617.40 1.59 615.80 1,743 615,34 0.00 616.38 0.00 617.42 1.61 615.85 1,864 615,36 0.00 616.40 0.00 617.44 1.63 615.90 1,986 615,38 0.00 616.42 0.00 617.46 1.65 615.95 2,110 615.40 0.00 616.44 0.00 617.48 1.66 616.00 2,235 615.42 0.00 616.46 0.00 617.50 1.68 616.05 2,362 615.44 0.00 616.48 0.00 617,52 41.70 616.10 (2,490 615.46 0.00 616.50 0.00 617.54 4.71 616.15 2,620 615.48 0.00 616,52 0.02 617.56 41.73 616.20 2,751 615,50 0.00 616.54 0.05 617.58 1.75 616.25 2,884 615.52 0.00 616.56 0.10 617.60 1.76 616.30 3,019 615.54 0.00 616.58 0.15, 617.62 1.78 616.35 3,155 615.56 0,00 616.60 0.22 617.64 1.79 616,40 3,293 615.58 0.00 616.62 0.28 617.66 1.81 616.45 3,432 615.60 0,00 616.64 0.36 617.68 1,83 616.50 3,573 615.62 0.00 616.66 0.44 617.70 1.84 616.55 3,716 615.64 0.00 616.68 0.52 617.72 1.86 616.60 3,860 615.66 0.00 616.70 0.61 617.74 1.87 616.65 4,006 615.68 0.00 616.72 071 617.76 1.89 616.70 4,153 615.70 0.00 616.74 0.81 617.78 1.90 616,75 4,302 615,72 0.00 616.76 0.86 617.80 1.92

1.86 616.60 3,860 615.66 0.00 616.70 0.61 617.74 1.87 616.65 4,006 615.68 0.00 616.72 071 617.76 1.89 616.70 4,153 615.70 0.00 616.74 0.81 617.78 1.90 616,75 4,302 615,72 0.00 616.76 0.86 617.80 1.92 616.80 4,452 615.74 0.00 616,78 0.89 617.82 1.93 616.85 4,604 615.76 0,00 616.80 0.92 617.84 1.95 616.90 4,758 615.78 0.00 616.82 0.95 617.86 1.96 616.95 4,913 615.80 0.00 616.84 0.98 617,88 1.97 617.00 5,070 615.82 0.00 616.86 1.01 617.90 1.99 617.05 5,228 615.84 0.00 616.88 1.04 617.92 2.00 617.10 5,388 615.86 0.00 616.90 4,06 617,94 2.02 617.15 5,550 615.88 0.00 616.92 1,09 617.96 2.03 617.20 5,713 615.90 0.00 616.94 4At 617.98 2.04 617.25 5,878 615.92 0.00 616,96 1.14 618.00 2.06 617.30 6,045 615.94 0.00 616.98 4.16 617.35 6,214 615.96 0.00 617.00 1.19 617.40 6,384 615.98 0,00 617.02 4.21 617.45 6,556 616.00 0.00 617.04 1.24 617.50 6,730 616.02 0.00 617.08 1.26 617.55 6,905

NOAA 24-hr D 10-Year Rainfall=5.22" Printed 8/5/2022 Summary for Link 2L: Mt. Pleasant Ave. 3.709 ac, 11.17% Impervious, Inflow Depth= 1.46" for 10-Year event 249cfs@ 12.18 hrs, Volume= 0.450 af 2.49 cfs @ 12.18 hrs, Volume= 0.450 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Link 2L: Mt. Pleasant Ave. Hydrograph Inflow Area=3.709 ac Flow (cf) 2°40 B HOME WTO a0 az 04 26 289032. 96 98 4042444048 2002 6s 0 6 0 62 OS 8 087072 imo (hours) 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-24 sin 08640 ©2021 Hi Inflow Elevation (cfs) (feet) NOAA 24-hr D 10-Year Rainfall=5.22" Printed 9/5/2022 Page 1 Hydrograph for Link 2L: Mt. Pleasant Ave. Primary Time Inflow Elevation Primary hours) (cfs) (feet) (fs) 52.00 0,00 0.00 0.00 53.00 0.00 0.00 9.00 54,00 0.00 0.00 0.00 55.00 0.00 0.00 0.00 56.00 0.00 0.00 0.00 57.00 0.00 0.00 0.00 58.00 0.00 0.00 0.00 59.00 0.00 0.00 0.00 60,00 0.00 0.00 0.00 61.00 0.00 0.00 0.00 62.00 0.00 0.00 0.00 63.00 0.00, 0.00 0.00 64.00 0.00 0.00 9.00 65,00 0.00 9.00 9.00 66.00 0.00 9.00 0.00 67.00 0.00 0.00 0.00 68.00 0.00 0.00 9.00 69.00 0.00 0.00 0.00 70.00 0.00 0.00 0.00 71.00 0.00 0.00 0.00 72.00 0.00 0.00 0.00

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20.24 sin 08640 © 2021 Hi ‘Summary for Link 3L: Mt. Pleasant Ave - Undetained Inflow Area = 0.965 ac, 4.06% Impervious, Inflow Depth = 2.64" for 10-Year event Inflow 249 cfs @ 12.18hrs, Volume= 0.212 af Primary 2.49 cfs @ 12.18hrs, Volume= 0.212 af, Atten= 0%, Lag= 0.0 min Routed to Link 2L : Mt. Pleasant Ave. Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Link 3L: Mt. Pleasant Ave - Undetained Hydrograph Inflow Area=0.965 ac Flow (cfs) O24 6B Tore Toso ab a1 25 25 9:2: 96.8404 4 a6 4860S 0 86D G2 OH 6608 7.72 ime (hours) 2022-07-28 Proposed Hydrology NOAA 24-hrD 10-Year Raintall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC Page 106 Hydrograph for Link 3L: Mt. Pleasant Ave - Undetained Time Inflow Elevation Primary | _ Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) | (hours) (cfs (feet) (cfs) 0.00 0.00 0.00 0.00 | "52.00 0.00 0.00 0.00 1.00 0.00 0.00 0.00 | 53.00 0.00 0.00 0.00 2.00 0.00 0.00 0.00 | 54.00 0.00 0.00 0.00 3.00 0.00 0.00 0.00 | 55.00 0.00 0.00 9.00 4.00 0.00 0.00 @.00 | 56.00 0.00 0.00 0.00 5.00 0.00 0.00 0.00 | 57.00 0.00 0.00 0.00 6.00 0.00 0.00 0.00 | 58.00 0.00 0.00 0.00 7.00 0.00 0.00 0.00 | 59.00 0.00 0.00 0.00 8.00 0.01 0.00 0.01 | 60.00 0.00 0.00 0.00 9.00 0.01 0.00 0.01 | 61.00 0.00 0.00 0.00 10.00 0.04 0.00 0.04 | 62.00 0.00 0.00 0.00 14.00 0.12 0.00 0.12 | 63.00 0.00 0.00 0.00 12.00 1.04 0.00 14.04 | 64,00 0.00 0.00 0.00 13.00 0.39 0.00 0.39 | 65.00 0.00 0.00 0.00 14.00 0.19 0.00, o19 | 66.00 0.00 0.00 0.00 15.00 0.13 0.00 013 | 67.00 0.00 0.00 0.00 16.00 om 0.00 011 | 68,00 0.00 0.00 0.00 17.00 0.09 0.00 0.09 | 69.00 0.00 0.00 0.00 18.00 0.07 0.00 oo7 | 70.00 0.00 0.00 0.00 19.00 0.07 0.00 0.07 | 71.00 0,00 0.00 0.00 20.00 0.08 0.00 0.06 | 72.00 0.00 0.00 0.00, 21,00 0.06 0.00 0.06 22.00 0.05 0.00 0.05 23,00 0.05 0.00 0.05 24.00 0.05 0.00 0.05, 25.00 0.00 0.00 0.00 26.00 0.00 0.00 0.00 27.00 0.00 0.00 0.00 28.00 0.00 0.00 0.00 29.00 0.00 0.00 0.00 30.00 0.00 0.00 0.00 31.00 0.00 0.00 0.00 32.00 0.00 0.00 0.00 33.00 0.00 0.00 0.00 34.00 9.00 0.00 0.00 35.00 0.00 0.00 0.00 36.00 0.00 0.00 0.00 37,00 0.00 0.00 0.00 38.00 0.00 0.00 0.00 39.00 0.00 0.00 0.00 40.00 0.00 0.00

00 0.00 32.00 0.00 0.00 0.00 33.00 0.00 0.00 0.00 34.00 9.00 0.00 0.00 35.00 0.00 0.00 0.00 36.00 0.00 0.00 0.00 37,00 0.00 0.00 0.00 38.00 0.00 0.00 0.00 39.00 0.00 0.00 0.00 40.00 0.00 0.00 0.00 41.00 0.00 0.00 0.00 42.00 0.00 0.00 0.00 43.00 0.00 0.00 0.00 44.00 0.00 0.00 0.00 45.00 0.00 0.00 0.00 46.00 0.00 0.00 0.00 47.00 0.00 0.00 0.00 48.00 0.00 0.00 0.00 49.00 0.00 0.00 0.00 50.00 0.00 0.00 0.00 51.00 0.00 0.00 0.00

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-2d_sin 08640_© 2021 HydroCAD Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 Page 107 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method ‘Subcatchment 18: Basin A- Imp. Subcatchment 3S: Basin A - Perv. ‘Subcatchment 4S: Basin B - Imp. ‘Subcatchment 5S: Basin B - Perv. ‘Subcatchment 7S: Basin C - Imp. Subcatchment 8S: Basin C - Perv. ‘Subcatchment 9S; Mt, Pleasant Ave ‘Subcatchment 10S: Mt. Pleasant Ave Subcatchment 11S: Basin D - Imp. ‘Subcatchment 12S: Basin D - Perv. Pond 3P: Basin A Pond 4P: Basin B Pond 5P: Basin C Pond 6P: Basin D Link 2L: Mt, Pleasant Ave. Link 3L: Mt, Pleasant Ave - Undetained Runoff Area=4,655 sf 10.00% impervious Runoff Depth=8.42" To=10.0 min CN=98 Runoff=0.76 cfs 0.075 af Runoff Area=24,500 sf 0.00% Impervious Runoff Depth=5.52" ‘Tc=10.0 min CN=74. Runoff=3.04 cfs 0.259 af Runoff Area=4,648 sf 10.00% Impervious Runoff Depth=8.42" Tc=10,0 min CN=98 Runoff=0.76 ofs 0.075 af Runoff Area=31,571 sf 0.00% Impervious Runoff Depth=5.52" Tc=10.0 min CN=74 Runoff=3.92 cfs 0.333 af Runoff Area=4,635 sf 100.00% Impervious Runoff Depth=8.42" Tc=10.0 min CN=98 Runoff=0.75 cts 0.075 af Runoff Area=31,149 sf 0.00% Impervious Runoff Depth=5.52" To=10.0 min CN=74 Runoff=3.87 cfs 0.329 af Runoff Area=1,706 sf 10.00% Impervious Runoff Depth=6.42" ‘To=10.0 min CN=98 Runoff=0.28 cfs 0.027 af Runoff Area=40,319 sf 0.00% Impervious Runoff Depth=5.52" Tc=10.0 min CN=74 Runoff=5.01 cfs 0.426 af Runoff Area=2,400 sf 100.00% Impervious Runoff Depth=8.42" Tc=10.0 min CN=98 Runoff=0.39 cfs 0.039 af Runoff Area=15,983 sf 0.00% Impervious Runoff Depth=5.52" To=10.0 min CN=74 Runoff=1.98 cfs 0.169 af Peak Elev=626.67' Storage=7,334 of inflow=3.80 cfs 0.334 af Outflow=0.77 cls 0.217 af Peak Elev=624.97" Storage=8,436 cf_Inflow=4.67 cfs 0.408 af Outflow=1.02 cfs 0.306 af Peak Elev=621.26' Storage=7,839 cf _Inflow=4.62 cfs 0.404 af Qutflow=1.47 cfs 0.285 af Peak Elev=616.75' Storage=4,291 of Inflow=2.37 cfs 0.207 af Outflow=0.82 cfs 0.125 af Inflow=7.51 ofs 1.387 af Primary=7.51 cfs 1.387 af Inflow=5.28 cfs 0.453 af Primary=5.28 cfs 0.453 af 2022-07-28 Proposed Hydrology NOAA 24-hr D.100-Year

2.37 cfs 0.207 af Outflow=0.82 cfs 0.125 af Inflow=7.51 ofs 1.387 af Primary=7.51 cfs 1.387 af Inflow=5.28 cfs 0.453 af Primary=5.28 cfs 0.453 af 2022-07-28 Proposed Hydrology NOAA 24-hr D.100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC. Page 108 Total Runoff Area = 3.709 ac_ Runoff Volume = 1.806 af Average Runoff Depth = 5.84" 98.83% Pervious = 3.295 ac 11.17% Impervious = 0.414 ac

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 Summary for Subcatchment 1S: Basin A - Imp. Runoff = 0.76 cfs @ 12.17 hrs, Volume= Routed to Pond 3P : Basin A 0.075 af, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, df= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf)_ CN Description 4,655___ 98 Unconnected pavement, HSG C 4,655 100.00% Impervious Area 4,655, 100,00% Unconnected Te Length Slope Velocity Capacity Description (min) (feet) _(fv/t)_(fiisec)__(cfs) 10.0 Direct Entry, Direct Subcatchment 1S: Basin A - Imp. Hydrograph on bee NOAA 24-hr D 654 100-Year Rainfall=8.66" 064 Runoff Area=4,655 sf me. Runoff Volume=0.075 af $ oss] Runoff Depth=8.42" Ee ~ Te=10.0 min 03: CN=98 FUT ETO Ta wave toa ae a 8 2032 9 0 98 4042 448 48802 So S860 G2 OK GHG 7072 “Tina (hours) 2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC. Page 110 Time Precip. Excess (hours) (inches) (inches) Hydrograph for Subcatchment 1S: Basin A - Imp. Runoff | Time Precip. Excess Runoff (hours) (inches) (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00

2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" 2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 CAD 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 114 HydroCAD® 10.20-2d s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 112 ‘Summary for Subcatchment 3S: Basin A - Perv. Hydrograph for Subcatchment 3S: Basin A - Perv. Runoff = 3.04cfs@ 12.17 hrs, Volume= 0.259 af, Depth= 5.52" Time Precip. Excess Runoff | Time Precip. Excoss Runoff Routed to Pond 3P : Basin A (hours) (inches) (inches ours) (inches) (inches) (fs 0.00 0.00 0.00 0.00 | 5200 8.66 5.52 0.00 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs aa eo peo 6.00 ||| $3.00 8.68 5.52 ea) NOAA 24-hr D. 100-Year Rainfall=8.66" 2.00 0.21 0.00 0.00 54,00 8.66 5.52 0.00 3.00 0.33 0.00 0.00 55.00 8.66 5.52 0.00 A 5 CN De 4.00 0.45, 0.00 0.00 56.00 8.66 5.52 0.00 rea (sf) escription 5.00 0.59 0.00, 0.00 | 57.00 868 5.52 0.00 24,500 74 >75% Grass cover, Good, HSG C 6.00 0.74 0.00 0.00 | 5800 886 552 0.00 24,500 00.00% Pervious Area 7.00 0.91 0.04 0.01 | 5900 868 552 0.00 8001.12 0.05 0.02 | 60.00 866 5.52 0.00 Te Len it it ‘pti 900 137 O11 0.04 | 61,00 866 552 0.00 (oa tees men lees ae 1000 172 0.23 0.08 | 6200 866 552 0.00 10.0 11.00 2.25 0.47, 0.19 63.00 8.66 5,52 0,00 2 Direct Entry, Direct 1200 415 (4.71 1.36 | 64.00 866 5.52 0.00 1300 641 3.53 as | 6500 866 5.52 0.00 Subcatchment 3S: Basin A - Perv. 14,00 6.94 3.99 0.21 66.00 8.66 5.52 0.00 15.00 7.29 4.23 0.15 67.00 8.66 5.52 0,00 Hydrograph 16.00 7.54 4.51 012 | 6800 866 5.52 0.00 47.00 775 4.70 0.10 | 69.00 868 5.52 0.00 Ge} ye00 792 489 0.08 | 70.00 866 552 0.00 19.00 8.07 4s 0.07 71.00 8.66 5.52 0.00 x NOAA 24-hr D 2000 821 5.14 007 | 7200 866 552 0.00 anfall=8. 66" 21.00 833 © 5.23 0.08 100-Year Rainfall=8.66' 2200 «845 «5.33 0.08 = 23.00 8.56 5.43 0.05 Runoff Area=24,500 sf Piece A 4 Runoff Volume=0-259 af 3500 888 582 0.00 z Seon : : 0.00 4 Runoff Depth=5.52' 27.00 866 5.52 0.00 - 2800 866 5.52 0.00 e Te=10.0 min 2900 868 5.52 0.00 CN=74 30.00 866 5.52 0.00 + 31.00 8.66 5.52 0.00 3200 866 552 0.00 33.00 8.66 5.52 0.00 34.00 8.66 5.52 0.00 35.00 8.66 5.52 0.00 36.00 8.66 5.52 0.00 ‘ 3700 8.66 5.52, 0.00 STN SETS Tews 1 10H Dee a0 28°90 92 96 36 30 00 42 0-40