2022 08 Drainage Report

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 4 Summary for Pond 3P: Basin A Inflow Area = 0.669 ac, 15.97% impervious, Inflow Depth= 5.98" for 100-Year event Inflow = 3.80 cfs @ 12.17 hrs, Volume= 0.334 af Outflow = 0.77 cfs @ 12.67 hrs, Volume= 0.217 af, Atten= 60%, Lag= 29.7 min Primary = 0.77 cfs@ 12.67 hrs, Volume= 0.217 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= 626.67’ @ 12.67 hrs Surf.Area= 3,608 sf Storage= 7,334 of Plug-Flow detention Center-of-Mass det. 2= 234.6 min caloulated for 0.217 af (65% of inflow) 1@= 122.5 min ( 929.3 - 806.8 ) Volume. Invert___Avail.Storage Storage Description ca] 624.00" 8,561 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store {feet) (sq-ft) (cubic-feet) (cubic-feet) 624.00 1,951 0 625.00 2.519 2,235 2,235 626.00 3,150 2,835 5,070 627.00 3,833 3,492 8,561 Device Routing invert__Outlet Ds #1 Primary 626.00' 6.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads rimary OutFlow Max=0.77 cfs @ 12.67 hrs HW=626.67' (Free Discharge) '=Orifice/Grate (Orifice Controls 0.77 cfs @ 3.94 fps) 2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 Hy 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC Pond 3P: Basin A Hydrograph Flow (cts) O24 6 6 10.12 a a to 20204 0 28 2022 9 2838 40 244404 5 2 488 860 62 OH 686 70 72 ime (hour) Pond 3P: Basin A Stage-Discharge Elevation (Foot) 624- 0 00s O1 O01 O2 G2 03 035 O4 O45 O05 O85 06 OOS O7 OFS 00 ONS 09 Diacharge (fs)

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 HydroCAD@ 10.20-2d_sin 08640 © 2021 HydroCAD Software Solutions LLC 4 Pond 3P: Basin A Stage-Area-Storago ‘Surfacemorizontaltted Aros (24-4) 9_210_4g0_ego_ego 1. gn 1.200140, 8002000200 24082600 24m0. 3000 9.4m3400a400 80 [ETEae) aan ————— 7 "900 11000 1,500 2000 2800 3,000 3,300 4.000 4.400 6,000 5,500 6.090 6500 7.000 7.500 8,000 8 500 ‘Storage (cublefeat) 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 13: Hydrograph for Pond 3P: Basin A Storage Elevation

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 9/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC. 4 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC Page 134 Stage-Discharge for Pond 3P: Basin A Stage-Area-Storage for Pond 3P: Basin A Elevation Primary Elevation Primary Elevation Primary Elevation Storage Elevation ‘Surface ‘Storage —__(feet)__(cfs) (feet) (cfs) (feet) (cfs) (feet) (cubic-feet) (feet) {sq-ft) {cubic-feet) 624.00 0.00 625.04 0.00 626.08 0.12 624.00 oO 626.60 3,560 7,082 624.02 0.00 625.06 0.00 626.10 0.16 624.05 626.65 3,594 7,261 624.04 0.00 625.08 0.00 626.12 0.21 624,10 626.70 3,628 7,442 624.06 0.00 625.10 0.00 626.14 0.27 624.15 626.75 3,662 7,624 624.08 0.00 625.12 0.00 626.16 0.33 624.20 626.80 3,696 7,808 624.10 0.00 625.14 0.00 626.18 0.39 624.25 626.85 3,731 7,994 624.12 0.00 625.16 0.00 626.20 0.42 624.30 626.90 3,765 8,181 624.14 0.00 625.18 0.00 626.22 0.44 624.35 626.95 3,799 8,370 624.16 0.00 625,20 0.00 626.24 0.46 624.40 627.00 3,833 8,561 624.18 0.00 625.22 0.00 626.26 0.48 624.45 624.20 0.00 625.24 0.00 626.28 0.50 624,50 624,22 0.00 625,26 0,00 626.30 0.52 624.55 624.24 0.00 625.28 0.00 626.32 0.53 624.60 624.26 0.00 625.30 0,00 626.34 0.55 624.65 624.28 0.00 625.32 0.00 626.36 0.57 624,70 624.30 0.00 625.34 0.00 626.38 0.58 624.75 624,32 0.00 625.36 0.00 626.40 0.60 624.80 624,34 0,00 625.38 0.00 626.42 0.61 624,85 624,36 0.00 625.40 0.00 626.44 0.63 624.90 624.38 0.00 625.42 0.00 626.46 0.64 624.95 624.40 0.00 625.44 0,00 626.48 0.66 625.00 624.42 0.00 625.46 0.00 626.50 0.67 625.05 624,44 0.00 625.48 0.00 626.52 0.68 625,10 624.46 0,00 625.50 0.00 626,54 0.69 625.15 624.48 0.00 625.52 0.00 626.56 0.71 625.20 624.50 0.00 625.54 0.00 626.58 0.72 625.25 624.52 0.00 625.56 0.00 626.60 0.73 625.30 624.54 0.00 625.58 0.00 626.62 0.74 625.35 624.56 0.00 625.60 0.00 626.64 0.76 625.40 624,58 0.00 625.62 0.00 626.66 077 625.45 624.60 0.00 625.64 0.00 626.68 0.78 625.50 624.62 0.00 625.66 0.00 626.70 0.79 625,55 624.64 0.00 625.68 0.00 626.72 0.80 625.60 624.66 0,00 625,70 0.00 626.74 0.81 625.65 624.68 0.00 625.72 0.00 626.76 0.82 625.70 624.70 0.00 625.74 0.00 626.78 0.83 625.75, 624.72 0.00 625.76 0.00

,55 624.64 0.00 625.68 0.00 626.72 0.80 625.60 624.66 0,00 625,70 0.00 626.74 0.81 625.65 624.68 0.00 625.72 0.00 626.76 0.82 625.70 624.70 0.00 625.74 0.00 626.78 0.83 625.75, 624.72 0.00 625.76 0.00 626,80 0.85 625.80 624.74 0.00 625.78 0,00 626.82 0.86 625.85 624.76 0.00 625.80 0.00 626.84 0.87 625.90 624.78 0.00 625.82 0.00 626.86 0.88 625.95 624.80 0.00 625.84 0.00 626.88 0.89 626.00 624.82 0.00 625.86 0.00 626.90 0.90 626.05 624.84 0.00 625.88 0.00 626.92 0.91 626.10 624.86 0.00 625.90 0,00 626.94 0.92 626.15 624.88 0.00 625.92 0.00 626.96 0.93 626.20 624,90 0.00 625.94 0.00 626.98 0.94 626.25 624.92 0.00 625.96 0.00 627.00 0.95 626.30 624.94 0.00 625.98 0.00 626.35 624.96 0.00 626.00 0,00 626.40 624.98 0.00 626.02 0.01 626.45 625.00 0.00 626.04 0,04 626.50 625,02 0,00 626.06 0,08 626.55

NOAA 24-hr D 100-Year Rainfall=8.66" 2022-07-28 Proposed Hydrology ee Printed 8/5/2022 4 Prepared by Dynamic Engineering HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC ‘Summary for Pond 4P: Basin B Inflow Area = 0.831 ac, 12.83% Impervious, Inflow Depth = 5.89" for 100-Year event Inflow = = 4.67 cls @ 12.17 hrs, Volume= 0.408 af Outflow = 1.02 cfs@ 12.64 hrs, Volume= 0.306 af, Atten= 78%, Lag= 27.8 min Primary = 1.02cfs@ 12.64 hrs, Volume= 0.306 af Routed to Link 2L : Mt. Pleasant Ave. Routing by Stor-Ind method Peak Elev= 624.97' @ 12. Plug-Flow detention time= 201.2 min calculated for 0.306 af (75% of inflow) Center-of-Mass det. time= 105.6 min ( 915.7 - 810.1 ) ime Span= 0,00-72.00 hrs, dt= 0.05 hrs rs. Surf.Area= 3,811 sf Storage= 8,436 of Volume __Invert__Avail,Storage _ Storage Description 8,561 cf Custom Stage Data (Prismatic) Listed below (Recalc) ca 622.00" Elevation Surf.Area Inc.Store Cum.Store 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 #4 Primary 623.80' 6.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads rimary OutFlow Max=1.02 cfs @ 12.64 hrs HW=624.97' (Free Discharge) =OrificelGrate (Orifice Controls 1.02 cfs @ 5.20 fps) 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-2d s/n 08640 © 2024 HydroCAD Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 Page 136 Pond 4P: Basin B Hydrograph Inflow Area=0.831 ac Peak Elev=624.97' Storage=8,436 cf Flow (fs) 2 46 8 M0 2 tet tab 2424 228 9052 3838404 4 4848 BOS 6 0 9800 2 408087072 2 (hours) Pond 4P: Basin B ‘Stage-Discharge Elevation (Fest) Discharge (cfs) es)

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 137 025: Etavatlon (feet) Pond 4P: Basin B Stage-Area-Storage SurfacetfrtzontalVettod Araa (sc) 9. 200 400 600 800 1,000 1,200 1.400 §,000 1,800 2,000 2200 2.400 2,800 2,800 3,000 9,200 3.400 3,600 3,800 Es = ies ————————— 0 ‘S50 ",000 1/800 2.000 2.800 3,000 260 4,000 300 5,000 5,300 6.000 6.300 7,000 7.500 8000 8.300 ‘Storage (cvbiefeat) 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering Hy 10.20-24 sin 08640 © 2021 H NOAA 24-hr D 100-Year Rainfall=8.66" “AD Software Solutions LLC Hydrograph for Pond 4P: Basin B Storage Elevation Printed 8/5/2022

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering NOAA 24-hr D 100-Year Rainfall=8.66" HydroCAD® 10.20-2 s/n 08640 © 2021 HydroCAD Software Solutions LLC Printed 8/5/2022 Page 139 Elevation Primary feet) (cfs) 22.00 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, 9.00 622.20 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 ‘Stage-Discharge for Pond 4P: Basin B Elevation Primary (feet) (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 0.08 623.88 012 623.90 0.16 623.92 0.21 623.94 027 623.96 0.33 623.98 0.39 624.00 0.42 624.02 0.44 624.04 0.46 624.06 0.48 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 0.64 624.28 066 624.30 0.67 624.32, 0.68 624.34 069 624.36 074 624.38, 0.72 624.40 0.73 624.42 0.74 624.44 0.76 624.46 o77 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, 0.86 624.64 087 624.66 0.88 624.68, 0.89 624.70 0.90 624,72 0.91 624,74 0.92 624,76 0.93 624.78 0.94 624.80 0.95 624.82 0.95 624.84 0.96 624.86 og7 624.88, 0.98 624,90 ogg 624.92, 4.00 624.94 1.01 624.96, 1.02 624.98 1.03 625.00 1.04 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 140 ‘Stage-Area-Storage for Pond 4P: Basin B Surface

00-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 140 ‘Stage-Area-Storage for Pond 4P: Basin B Surface Storage (sa-ft (cubio-feet) Elevation Surface Storage

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 14° Summary for Pond 5P: Basin C 0.821 ac, 12.95% Impervious, Inflow Depth= 5.90" for 100-Year event = 4.62 cfs @ 12.17 hrs, Volume= 0.404 af = 1.47 cfs @ 12.46 hrs, Volume= 0.285 af, Atten= 68%, Lag= 17.3 min Primary = 1.47 cfs @ 12.46 hrs, Volume= 0.285 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= 621.26'@ 12.46 hrs Surf.Area= 3,743 sf Storage= 7,839 cf Plug-Flow detention time= 199.5 min calculated for 0.285 af (71% of inflow) Center-of-Mass det. time= 95.6 min ( 905.6 - 810.0 ) Volume Invert___Avail,Storage Storage Description ca 618.50" 8,744 of Custom Stage Data (Prismatic) Listed below (Recalc) Elevation ‘Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) __(cubic-feet) 618.50 1,966 0 0 619.00 2,285 1,063 1,063 620.00 2,892 2,589 3,651 621.00 3,560 3,226 6,877 621.50 3,907 1,867 8,744 Device Routing Invert__Qutlet Devices #1 Primary 620.50' 8.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Brimary '=Orifice/Grate (Orifice Controls 1.47 cfs @ 4.20 fps) 2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 Hi 40.20-2d_ sin 08640 © 2021 HydroCAD Software Solutions LLC Pond 5P: Basin C Hydrogranh Inflow Area=0.821 ac Peak Elev=621.26" Storage=7,839 cf Flow (cf) (0-2-4 6 8 WO 14 901020 22 26 26 28 30 92 36 96 39 40 42 44 40.48 50 52 54 56 $8 BO 62 64 U6 68.70 72 ‘Tae (hours) Pond 5P: Basin C Stage-Discharge cr Elevation (Foot) ° 7 Discharge (ets)

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroGAD@ 10.20-24 sin 08640 © 2021 Hy Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 o. i) Pond 5P: Basin C Stage-Area-Storaga ‘SurfacomMorizontalWetted Area (sat) 1500 20002500 9 00 4.090 3990 3500 "Wo 100 1.300 2.600 2300 3,000 3300 4.000 4 300 5,000 5.800 6.000 6.900 7,000 700 8,000 6,500 ‘Storage (cuble‘oat) 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 144 Hydrograph for Pond 5P: Basin C Storage Elevation