2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10,20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 81 Pond 3P: Basin A Stage-Area-Storage ‘SurfaceltiorizontalWetted Aros (sa) © 200. 400 609 _ 800 1,000 1,200 #,400 1,600 1,800 2,000 2.200 2.400 2.600 2.800 3,000 3,200 3,400 3,600 3,800 ES) er Elevation (foot) ae ‘0800 1,000 1.800 2,000 2,800 3,000 300 4.600 4.500 5000 5800 6.000 6.500 7,000 7.500 6.000 8.500 ‘Storage (cubefeat) 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC NOAA 24-hr D 10-Year Rainfall=5.22" Page 82 Hydrograph for Pond 3P: Basin A Storage Elevation

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=6.22" Prepared by Dynamic Engineering Printed 8/5/2022 Prepared by Dynamic Engineering Printed 9/5/2022 JAD@ 10.20-2d s/n 08640 © 2021 SAD® 10.20-2d s/n 08640 © 2021 Hy Stage-Discharge for Pond 3P: Basin A ‘Stage-Area-Storage for Pond 3P: Basin A esersion Pray Elevation Primary Elevation Surface Storage ic ‘Surface Storage —(feet)__(cfs) 625.04 0.00 624.00 1,951 0 626.60 3,560 7,082 625.08 0.00 624.05 1,979 98 626.65 3,594 7,261 625.08 0.00 624.10 2,008 198 626.70 3,628 7,442 625.10 0.00 624.15 2,036 299 626.75 3,662 7,624 625.12 0.00 624.20 2,065 402 626.80 3,696 7,808 625.14 9.00 624.25 2,093 506 626.85 3,731 7,994 625.16 0.00 624.30 224 611 626.90 3,765 8,181 625.18 0.00 624.35, 2,150 18 626.95 3,799 8,370 625.20 0.00 624.40 2,178 826 627.00 3,833 8,561 625.22 0.00 624,45 2,207 935, 625.24 0.00 624.50 2,235 4,047 625.26 0.00 624.55 2,263 1,159 625.28 0.00 624.60 2,292 1,273 625.30 0.00 624.65 2,320 1,388 625.32 0.00 624.70 2,349 4,505 625.34 0.00 624.75 2377 1,623 625.36 0.00 624.80 2,405 1,743 625.38 0.00 624.85 2,434 1,864 625.40 0.00 624.90 2,462 1,986 625.42 0.00 624.95 2.491 2,110 625.44 0.00 625.00 2,519 2,235 625.46 0.00 625.05 2,551 2,362 625.48 0,00 625.10 2,582 2,490 625.50 0,00 625.15 2614 2,620 625.52 0.00 625.20 2,645 2,751 625.54 0.00 625.25 2,677 2,884 625.56 0.00 625.30 2,708 3,019 625.58 0.00 625,35 2,740 3,155 625.60 0.00 625.40 2774 3,293 625.62 0.00 625.45 2,803 3,432 625.64 0.00 625.50 2,835 3,573 625.66 0.00 625.55 2,866 3,716 625.68 0.00 625.60 2,898 3,860 625.70 0.00 625.65 2,929 4,006 625.72 0.00 625.70 2.961 4,153 625.74 0.00 625.75 2,992 4,302 625.76 0.00 625.80 3,024 4,452 625.78 0.00 625.85 3,055 4,604 625.80 0.00 625.90 3,087 4,758 625.82 0.00 625.95 3,118 4913 625.84 0.00 626.00 3,150 5,070 625.86 0.00 626.05 3,184 5,228 625.88 0.00 626.10 3,218 5,388 625.90 0.00 626.15 3,252 5,550 625.92 90.00 626.20 3,287 5,713 625.94 90.00 626.25 3,321 5.878 625.96 0.00 626.30 3,355 6,045 625.98 0.00 626.35 3,389 6214 626.00 0.00 626.40 3,423 6,384 626.02 0.01 626.45 3,457 6,556 626.04 0.04 626.50 3,492 6,730 626.08 0.08 626.55 3,526 6,905

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=6,22" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_sin 08840 © 2021 HydroCAD Software Solutions LLC ‘Summary for Pond 4P: Basin B Inflow Area = 0.831 ac, 12.83% Impervious, Inflow Depth = 2.85" for 10-Year event Inflow = = 227 cfs@ 12.18hrs, Volume= 0.198 af Outflow = 0.30 cfs@ 13.18 hrs, Volume= 0.096 af, Atten= 87%, Lag= 58.7 min Primary = 0.30 cfs @ 13.15 hrs, Volume= 0.096 af Routed to Link 2L : Mt. Pleasant Ave. Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs. Peak Elev= 623.95 @ 13.15 hrs Surf.Area= 3,118 sf Storage= 4,910 cf Plug-Flow detention time= 314.2 min calculated for 0.096 af (48% of inflow) Center-of-Mass det. time= 177.5 min ( 1,005.2 - 827.7 ) Volume Invert___Avail.Storage Storage Description a 622.00" 8,561 of |Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Ine.Store Cum.Store (feet) {sq-ft) (cubic-feet) (cubic-feet) 622.00 1,951 0 0 623.00 2,519 2,235 2,235 624.00 3,150 2,835 5,070 625.00 3,833 3,492 8,561 Device Routing Invert__Outlet Devices #1 Primary 623.80' 6.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads imary OutFlow Max=0.30 cfs @ 13.15 hrs HW=623.95' (Free Discharge) =Orifice/Grate (Weir Controls 0.30 cfs @ 1.26 fps) 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 86 Pond 4P: Basin B Hydrograph es) Inflow Area=0.831 ac Peak Elev=623.95" Storage=4,910 cf Flow (fs) ° O° GG vO te Tato Wea a as 8 28-9: 6 3 98.40.4244 4 8 9 2 4 8 8 0 620460687072 Pond 4P: Basin B ‘Stage-Discharge Elevation (fest) Discharge (cfs)

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 8/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD@ 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC HydroCAD@ 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 88 Pond 4P: Basin B Hydrograph for Pond 4P: Basin B Stage-Ares-Storage Time Inflow Storage Elevation Primary 02s eh a -Cintoen Stage Data we ‘0 800. 1,000 1,800 2,000 2,500 3,000 8.500 4,000 4.800 5.00 5,500 6,000 6,500 7,000 7,500 8,000 8,500 ‘Storage (cublefeet)

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering Elevation Primary (feet) (cfs) 622.00 0.00 622.02 0.00 622.04 0.00 622.06 0.00 622.08 0.00 622.10 0.00 622.12 0.00 622.14 0.00 622.16 0.00 622.18 0.00 622.20 0,00 622.22 0.00 622.24 0.00 622.26 0.00 622.28 0.00 622.30 0.00 622.32 0.00 622.34 0.00 622.36 0.00 622.38 0.00 622.40 0.00 622.42 0.00 622.44 0.00 622.46 0.00 622.48 0.00 622.50 0.00 622.52 0.00 622.54 0.00 622.56 0.00 622.58 0.00 622.60 0.00 622.62 0,00 622.64 0.00 622.66 0.00 622.68 0.00 622.70 0.00 622.72 0.00 622.74 0.00 622.76 0,00 622.78 0.00 622.80 0.00 622.82 0.00 622.84 0.00 622.86 0.00 622.88 0.00 622.90 0.00 622.92 0.00 622.94 0,00 622.96 0.00 622.98 0.00 623.00 0.00 623.02 0.00 HydroCAD® 10.20-24_ s/n 08640 © 2021 HydroCAD Software Solutions LLC Stage-Discharge for Pond 4P: Basin B Elevation Primary —lfeet)___(cfs), 623.04 0.00 623.06 0.00 623.08 0.00 623.10 0.00 623.12 0.00 623.14 0.00 623.16 0.00 623.18 0.00 623.20 0.00 623.22 0.00 623.24 0.00 623.26 0,00 623.28 0.00 623.30 0.00 623.32 0.00 623.34 0.00 623.36 0.00 623.38 0.00 623.40 0.00 623.42 0.00 623.44 0.00 623.46 0.00 623.48 0.00 623.50 0.00 623.52 0.00 623.54 0.00 623.56 0.00 623.58 0.00 623.60 0.00 623.62 0.00 623.64 0.00 623.66 0.00 623.68 0.00 623.70 0.00 623.72 0,00 623.74 0.00 623.76 0.00 623.78 0.00 623.80 0.00 623.82 0.01 623.84 0.04 623.86 0.08 623.88 0.12 623.90 0.16 623.92 0.21 623.94 0.27 623.96 0.33 623.98 0.39 624.00 0.42 624.02 0.44 624.04 0.46 NOAA 24-hr D 10-Year Rainfall=5.22" Elevation Primary feet) ___(cfs) 624.08 0.50 624.10 0.52 624.12 0.53 624.14 0.55 624.16 0.57 624.18 0.58 624.20 0.60 624.22 0.61 624.24 0.63 624.26 0.64 624.28 0.66 624.30 0.67 624.32 0.68 624.34 0.69 624.36 0.71 624,38 0.72 624.40 0.73 624.42 0.74 624.44 0.76 624.46 0.77 624.48 0.78 624.50 0.79 624.52 0.80 624.54 0.81 624.56 0.82 624.58 0.83 624.60 0.85 624.62 0.86 624.64 0.87 624.66 0.88 624.68 0.89 624.70 0.90 624.72 091 624.74 0.92 624.76 0.93 624.78 0.94 624.80 0.95 624.82 0.95, 624.84 0.96 624.86 0.97 624.88 0.98 624.90 0.99 624.92 1,00 624.94 1.01 624.96 1.02 624.98 1.03 625.00 1,04 Printed 9/5/2022 Page 89 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-24_ s/n 08640 © 2021 HydroCAD Software Solutions LLC. NOAA 24-hr D 10-Year Rainfall=5.22" Printed 8/5/2022 Page 90 Stage-Area-Storage for Pond 4P: Basin B Elevation Surface

eering HydroCAD® 10.20-24_ s/n 08640 © 2021 HydroCAD Software Solutions LLC. NOAA 24-hr D 10-Year Rainfall=5.22" Printed 8/5/2022 Page 90 Stage-Area-Storage for Pond 4P: Basin B Elevation Surface Storage | Elevation Surface Storage (feet) (sa-ft)__(cubic-feet) (feet) (sa-ft)___(cubic-feet) 622.00 1,951 0 624.60 3,560 7,082 622.05 1,979 98 624.65 3,594 7,261 622.10 2,008 198 624.70 3,628 74a 622.15 2,036 299 624.75 3,662 7,624 622.20 2,085 402 624.80 3,696 7,808 622.25 2,093 506 624.85 3,731 7,994 622.30 2121 614 624.90 3,765 8,181 622.35 2,150 718 624.95 3,799 8,370 622.40 2.178 826 625.00 3,833 8,561 622.45 2,207 935 622.50 2,235 1,047 622.55 2,263 1,159 622.60 2,292 4,273 622.65 2/320 1,388 622.70 2,349 1,505 622.75 2377 1,623 622.80 2,405 1,743 622.85 2,434 1,864 622.90 2,462 1,986 622.95 2,491 2,110 623.00 2,519 2.235 623.05 2,551 2,362 623.10 2,582 2,490 623.15 2,614 2,620 623.20 2,645 2,751 623.25 2,677 2,884 623.30 2,708 3,019 623.35 2,740 3,185 623,40 2774 3,293 623.45 2,803 3,432 623.50 2,835 3,873 623.55 2,866 3,716 623.60 2,898 3,860 623.65 2,929 4,008 623.70 2,961 4153 623.75 2,992 4,302 623.80 3,024 4,452 623.85 3,055 4,604 623,90 3,087 4,758 623.95 3118 4913 624,00 3,150 5,070 624.05 3,184 5,228 624.10 3,218 5,388 624.15 3,252 5,550 624.20 3,287 5,713 624.25 3,321 5,878 624.30 3,355 6,045 624.35 3,389 6214 624.40 3,423 6,384 624.45 3,457 6,556 624.50 3,492 6,730 624.55 3,526 6,905

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 8/5/2022 Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 Hi HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC. ‘Summary for Pond 5P: Basin C Pond 5P: Basin C Hydrograph Inflow Area= 0.821 ac, 12.95% Impervious, Inflow Depth = 2.86" for 10-Year event Inflow = —-2.24cfs@ 12.18 hrs, Volume= 0.196 af re) Outflow = 0.18 cis@ 13.74 hrs, Volume= 0.077 af, Atten= 92%, Lag= 93.6 min Primary = 0.18cfs@ 13.74hrs, Volume= 0.077 af _ Inflow Area=0.821 ac Routed to Link 2L : Mt. Pleasant Ave. Peak Elev=620.59" Storage=5,470 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 620.59' @ 13.74 hrs Surf.Area= 3,285 sf Storage= 5,470 cf Plug-Flow detention time= 369.8 min calculated for 0.077 af (39% of inflow) g Center-of-Mass det. time= 222.9 min ( 1,050.5 - 827.5 ) & Volume ___Invert__Avail.Storage Storage Description i "1 618.50" 8,744 cf_ Custom Stage Data (Prismatic) Listed below (Recalc) Elevation SurfArea Inc.Store - Cum.Store (feet) (sa-ft) __(cubic-feet) __(cubic-feet) 618.50 1,966 0 0 619.00 2,285 1,063 1,083 620.00 2.892 2,589 3,651 621.00 3560 3226 e877 OTe a 8 toe Yo WoDO Beat 268903. 36 384042 40400 49 060 040807072 621.50 3,907 1,867 8,744 Device _ Routing Invert__Qutlet Devices Pond 5P: Basin C #1 Primary 620.50' 8,0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Stage-Dischargo Frimary OutFlow Max=0.18 cfs @ 13.74 hrs HW=620.59' (Free Discharge) {| |=Orifice/Grate (Weir Controls 0.18 cfs @ 0.98 fps) eat i é ty 7 Discharge (cfs)

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=6.22" 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 9/5/2022 P: HydroCAD@ 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC 10.20-24 sin 08640 © 2021 HydroCAD Software Solutions LLC Pond 5P: Basin C Hydrograph for Pond 5P: Basin C omen Time Inflow Storage Elevation Primary ‘Surface/MorlzontalWotted Area sat) 9 590 11900 ‘500 2000. 2500 3903800 eS] 7 & : 620- 3 oy ~knsat ——— 0” 800 1,000 1,800 2.000 2,800 9,000 3.800 4,000 4,200 5.000 5.500 6,000 6.800 7,000 7.500 8.000 800 50.00 0,00 5,181 620.50 0.00 Sere aie se 52.50 0.00 5,181 620.50 0.00 55,00 0.00 ‘5,181 620.50 0.00 57.50 0.00 5,181 620.50 0.00 60.00 0.00 5,181 620.50 0.00 62.50 0.00 5,181 620.50 0.00 65.00 0.00 5,181 620.50 0.00 67.50 0,00 5,181 620.50 0.00

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 \D@ 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC P: 95 ‘Stage-Discharge for Pond 5P: Basin C Elevation Primary | Elevation Primary | Elevation Primary feet) (cfs) (feet) (fs) 618.50 0.00 619.54 0,00 618.52 0.00 619.56 0.00 618.54 0.00 619.58 0.00 618.56 0.00 619.60, 0.00 618.58 0.00 619.62 0.00 618.60, 0.00 619.64 0.00 618.62 0.00 619.66, 0.00 618.64 0.00 619.68, 0.00 618.66, 0.00 619.70 0.00 618.68, 0.00 619.72 0.00 618.70 0.00 619.74 0.00 618.72 0.00 619.76 0.00 618.74 0.00 619.78 0.00 618.76 0.00 619.80 0.00 618.78, 0.00 619.82 0.00 618.80, 0.00 619.84 0.00 618.82 0.00 619.86 0.00 618.84 0.00 619.88, 0.00 618.86 0.00 619.90 90.00 618.88 0.00 619.92 0.00 618.90 0.00 619.94 0.00 618.92 0.00 619.96 0.00 i 618.94 9.00 619.98, 0.00 i 618.96 0.00 620.00 0.00 621.04 1.24 618.98, 0.00 620.02 0.00 621.06 1.26 619.00 0.00 620.04 0.00 621.08, 1.28 619.02, 0.00 620.06 0.00 621.10 130 619.04 0.00 620.08 0.00 621.12 1.32 619.08 0.00 620.10 0.00 621.14 1.34 619.08 0.00 620.12, 0.00 621.16 137 619.10 0.00 620.14 0.00 621.18 1.39 619.12 0.00 620,16 0.00 621.20 141 619.14 0.00 620.18 0.00 621.22 1.43 619.16, 0.00 620.20, 0.00 621.24 1.45 619.18 0.00 620.22, 0.00 621.26 147 619.20, 0.00 620.24 0.00 621.28 1.48 619.22 0.00 620.26 0.00 621.30 1.50 619.24 0.00 620.28 0.00 621.32 152 619.26 0.00 620.30 0.00 621.34 1.54 619.28, 0.00 620.32 0.00 621.36 156 619.30 0.00 620.34 0.00 621.38, 4.58 619.32, 0.00 620.36 0.00 621.40 1.99 619.34 0.00 620.38, 0.00 621.42 1.61 619.36 0.00 620.40 0.00 621.44 1.63 619.38 0.00 620.42, 0.00 621.46 1.65 619.40, 0.00 620.44 0.00 621.48 1.68 619.42, 0.00 620.46 0.00 621.50 1.68 619.44 0.00 620.48, 0.00 619.46 0.00 620.50 0.00 619.48 0.00 620.52 0.02 619.50 0.00 620.54 0.05 619.52 0.00 620.56 0.10 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering froCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC P: Stage-Area-Storage for Pond 5P: Basin C Elevation Surface Storage

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 s/n 08640 © 2021 HydroCAD Software Solutions LLC Summary for Pond 6P: Basin D Inflow Area = 0.422 ac, 13.06% Impervious, Inflow Depth = 2.86" for 10-Year event Inflow = = 4.15 cfs@ 12.18 hrs, Volume= 0.101 af Outflow = 0.03 cfs @ 17.93 hrs, Volume= 0.019 af, Atten= 97%, Lag= 345.2 min Primary = 0.03 cfs @ 17.93 hrs, Volume= 0.019 af Routed to Link 2L : Mt. Pleasant Ave. Routing by Stor-ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 616.53’ @ 17.93 hrs Surf.Area= 2,853 sf Storage= 3,655 cf Plug-Flow detention time= 601.9 min calculated for 0.019 af (18% of inflow) Center-of-Mass det, time= 401.0 min ( 1,228.4 - 827.4 ) Volume. Invert__Avail Storage _Storage Description 1 615.00' 8,561 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf Area Inc.Store Cum.Store (feet) (sa-ft) (cubic-feet) (cubic-feet) 615.00 1,951 0 0 616.00 2,519 2,235 2,235 617.00 3,150 2,835 5,070 618.00 3,833 3,492 8,561 Device Routing invert _Outlet Devices #1 Primary 616.50' 8.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Rrimary j=Orifice/Grate (Weir Controls 0.03 ofs @ 0.55 fps) 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC. Pe Pond 6P: Basin D Hydrograph Inflow Area=0.422 ac Peak Elev=616.53" Storage=3,655 cf g 3 é Dee a 8 8 1012 4010 IO IL D4 25 282090 31 309840 4244 40 40 99 2 54509000 62640860 7072 Time (hour) Pond 6P: Basin D Stage-Diacharge a (eee) om Elevation (Feat) 6