240916_40 ERW Stormwater Report FULL

NOAA 24-hr D 2-Year Rainfall=3.44"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 67HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Pond 12P: Subsurface Infiltration Basin - Chamber Wizard Field A Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length) Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing 9 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 65.70' Row Length +12.0" End Stone x 2 = 67.70' Base Length 8 Rows x 51.0" Wide + 6.0" Spacing x 7 + 12.0" Side Stone x 2 = 39.50' Base Width 6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height 72 Chambers x 45.9 cf = 3,307.7 cf Chamber Storage 9,359.1 cf Field - 3,307.7 cf Chambers = 6,051.4 cf Stone x 40.0% Voids = 2,420.6 cf Stone Storage Chamber Storage + Stone Storage = 5,728.2 cf = 0.132 af Overall Storage Efficiency = 61.2% Overall System Size = 67.70' x 39.50' x 3.50' 72 Chambers 346.6 cy Field 224.1 cy Stone This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 68HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Pond 12P: Subsurface Infiltration Basin Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 Inflow Area=0.687 ac Peak Elev=622.57' Storage=0.041 af 1.06 cfs 0.10 cfs 0.09 cfs 0.01 cfs Pond 12P: Subsurface Infiltration Basin Surface Storage Stage-Area-Storage Storage (acre-feet) 0.130.120.110.10.090.080.070.060.050.040.030.020.010 Surface/Horizontal/Wetted Area (acres) 0.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 Elevation (feet) 625 624 623 622 Field A ADS_StormTech SC-740 +Cap This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 69HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 12P: Subsurface Infiltration Basin Time (hours) Inflow (cfs) Storage (acre-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0.000 621.50 0.00 0.00 0.00 2.50 0.00 0.000 621.50 0.00 0.00 0.00 5.00 0.01 0.000 621.50 0.01 0.01 0.00 7.50 0.01 0.000 621.51 0.01 0.01 0.00 10.00 0.03 0.000 621.52 0.03 0.03 0.00 12.50 0.30 0.035 622.44 0.09 0.09 0.00 15.00 0.06 0.039 622.53 0.09 0.09 0.00 17.50 0.04 0.031 622.36 0.08 0.08 0.00 20.00 0.03 0.020 622.16 0.08 0.08 0.00 22.50 0.02 0.010 621.90 0.07 0.07 0.00 25.00 0.00 0.000 621.50 0.01 0.01 0.00 27.50 0.00 0.000 621.50 0.00 0.00 0.00 30.00 0.00 0.000 621.50 0.00 0.00 0.00 32.50 0.00 0.000 621.50 0.00 0.00 0.00 35.00 0.00 0.000 621.50 0.00 0.00 0.00 37.50 0.00 0.000 621.50 0.00 0.00 0.00 40.00 0.00 0.000 621.50 0.00 0.00 0.00 42.50 0.00 0.000 621.50 0.00 0.00 0.00 45.00 0.00 0.000 621.50 0.00 0.00 0.00 47.50 0.00 0.000 621.50 0.00 0.00 0.00 50.00 0.00 0.000 621.50 0.00 0.00 0.00 52.50 0.00 0.000 621.50 0.00 0.00 0.00 55.00 0.00 0.000 621.50 0.00 0.00 0.00 57.50 0.00 0.000 621.50 0.00 0.00 0.00 60.00 0.00 0.000 621.50 0.00 0.00 0.00 62.50 0.00 0.000 621.50 0.00 0.00 0.00 65.00 0.00 0.000 621.50 0.00 0.00 0.00 67.50 0.00 0.000 621.50 0.00 0.00 0.00 70.00 0.00 0.000 621.50 0.00 0.00 0.00 This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 70HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 12P: Subsurface Infiltration Basin Elevation (feet) Surface (acres) Storage (acre-feet) 621.50 0.061 0.000 621.55 0.061 0.001 621.60 0.061 0.002 621.65 0.061 0.004 621.70 0.061 0.005 621.75 0.061 0.006 621.80 0.061 0.007 621.85 0.061 0.009 621.90 0.061 0.010 621.95 0.061 0.011 622.00 0.061 0.012 622.05 0.061 0.015 622.10 0.061 0.017 622.15 0.061 0.020 622.20 0.061 0.022 622.25 0.061 0.025 622.30 0.061 0.027 622.35 0.061 0.030 622.40 0.061 0.032 622.45 0.061 0.035 622.50 0.061 0.037 622.55 0.061 0.040 622.60 0.061 0.042 622.65 0.061 0.045 622.70 0.061 0.047 622.75 0.061 0.050 622.80 0.061 0.052 622.85 0.061 0.054 622.90 0.061 0.057 622.95 0.061 0.059 623.00 0.061 0.062 623.05 0.061 0.064 623.10 0.061 0.066 623.15 0.061 0.068 623.20 0.061 0.071 623.25 0.061 0.073 623.30 0.061 0.075 623.35 0.061 0.077 623.40 0.061 0.080 623.45 0.061 0.082 623.50 0.061 0.084 623.55 0.061 0.086 623.60 0.061 0.088 623.65 0.061 0.090 623.70 0.061 0.092 623.75 0.061 0.094 623.80 0.061 0.096 623.85 0.061 0.098 623.90 0.061 0.100 623.95 0.061 0.102 624.00 0.061 0.104 624.05 0.061 0.106 624.10 0.061 0.108 624.15 0.061 0.109 624.20 0.061 0.111 624.25 0.061 0.113 624.30 0.061 0.114 624.35 0.061 0.115 Elevation (feet) Surface (acres) Storage (acre-feet) 624.40 0.061 0.117 624.45 0.061 0.118 624.50 0.061 0.119 624.55 0.061 0.120 624.60 0.061 0.122 624.65 0.061 0.123 624.70 0.061 0.124 624.75 0.061 0.125 624.80 0.061 0.127 624.85 0.061 0.128 624.90 0.061 0.129 624.95 0.061 0.130 625.00 0.061 0.132 This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 71HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC 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 Runoff Area=2,878 sf 100.00% Impervious Runoff Depth=4.98"Subcatchment 1S: 2BP-I Flow Length=75' Slope=0.0140 '/' Tc=1.1 min CN=98 Runoff=0.36 cfs 0.027 af Runoff Area=9,508 sf 100.00% Impervious Runoff Depth=4.98"Subcatchment EX 1-I: Flow Length=149' Tc=1.6 min CN=98 Runoff=1.19 cfs 0.091 af Runoff Area=34,310 sf 0.00% Impervious Runoff Depth=2.63"Subcatchment EX 1-P: Flow Length=233' Tc=10.4 min CN=75 Runoff=2.02 cfs 0.173 af Runoff Area=33,427 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment EX 2-P: Flow Length=251' Tc=10.1 min CN=74 Runoff=1.92 cfs 0.162 af Runoff Area=12,817 sf 0.00% Impervious Runoff Depth=2.72"Subcatchment EX 3 - P: Flow Length=109' Tc=7.8 min CN=76 Runoff=0.86 cfs 0.067 af Runoff Area=2,919 sf 100.00% Impervious Runoff Depth=4.98"Subcatchment PR 1A-I: Flow Length=149' Tc=1.6 min CN=98 Runoff=0.37 cfs 0.028 af Runoff Area=21,722 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment PR 1A-P: Flow Length=395' Tc=10.5 min CN=74 Runoff=1.23 cfs 0.106 af Runoff Area=6,622 sf 0.00% Impervious Runoff Depth=3.98"Subcatchment PR 1B-P: Tc=6.0 min CN=89 Runoff=0.65 cfs 0.050 af Runoff Area=6,039 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment PR 2A-P: Flow Length=81' Slope=0.3000 '/' Tc=2.7 min CN=74 Runoff=0.46 cfs 0.029 af Runoff Area=5,659 sf 100.00% Impervious Runoff Depth=4.98"Subcatchment PR 2C-I: Flow Length=86' Slope=0.0230 '/' Tc=1.0 min CN=98 Runoff=0.71 cfs 0.054 af Runoff Area=21,408 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment PR 2C-P: Flow Length=100' Slope=0.0200 '/' Tc=9.4 min CN=74 Runoff=1.26 cfs 0.104 af Runoff Area=10,406 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment PR 3 - P: Flow Length=109' Tc=7.8 min CN=74 Runoff=0.66 cfs 0.051 af Runoff Area=8,642 sf 100.00% Impervious Runoff Depth=4.98"Subcatchment PR-2B-I: Flow Length=75' Slope=0.0140 '/' Tc=1.1 min CN=98 Runoff=1.09 cfs 0.082 af Runoff Area=1,446 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment PR-2B-P: Flow Length=114' Tc=8.0 min CN=74 Runoff=0.09 cfs 0.007 af Inflow=2.64 cfs 0.263

Tc=1.1 min CN=98 Runoff=1.09 cfs 0.082 af Runoff Area=1,446 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment PR-2B-P: Flow Length=114' Tc=8.0 min CN=74 Runoff=0.09 cfs 0.007 af Inflow=2.64 cfs 0.263 afReach 1R: TOP Outflow=2.64 cfs 0.263 af Inflow=4.38 cfs 0.426 afReach 2R: CHANNEL Outflow=4.38 cfs 0.426 af Inflow=5.16 cfs 0.492 afReach 3R: TOTAL Outflow=5.16 cfs 0.492 af This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 72HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Inflow=2.64 cfs 0.263 afReach 4R: Outflow=2.64 cfs 0.263 af Inflow=1.60 cfs 0.158 afReach 8R: (new Reach) Outflow=1.60 cfs 0.158 af Avg. Flow Depth=0.15' Max Vel=8.96 fps Inflow=1.37 cfs 0.133 afReach DP1: TOP 34.0" x 22.0", R=24.9" Elliptical Pipe n=0.011 L=100.0' S=0.1000 '/' Capacity=118.41 cfs Outflow=1.36 cfs 0.133 af Inflow=1.97 cfs 0.250 afReach DP2: CHANNEL Outflow=1.97 cfs 0.250 af Inflow=2.53 cfs 0.300 afReach DP3: TOTAL Outflow=2.53 cfs 0.300 af Inflow=1.37 cfs 0.133 afReach EX 1: Outflow=1.37 cfs 0.133 af Peak Elev=624.68' Storage=0.016 af Inflow=0.65 cfs 0.050 afPond 2P: Pervious Pavers Outflow=0.08 cfs 0.050 af Peak Elev=0.43' Inflow=1.37 cfs 0.133 afPond 10P: (new Pond) Outflow=1.37 cfs 0.133 af Peak Elev=609.66' Storage=0.031 af Inflow=1.15 cfs 0.138 afPond 11P: Existing Drywell System Discarded=0.04 cfs 0.051 af Primary=0.29 cfs 0.087 af Outflow=0.33 cfs 0.138 af Peak Elev=623.31' Storage=0.076 af Inflow=1.93 cfs 0.185 afPond 12P: Subsurface Infiltration Basin Discarded=0.11 cfs 0.137 af Primary=0.18 cfs 0.048 af Outflow=0.28 cfs 0.185 af Total Runoff Area = 4.082 ac Runoff Volume = 1.031 af Average Runoff Depth = 3.03" 83.35% Pervious = 3.402 ac 16.65% Impervious = 0.680 ac This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 73HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: 2BP-I Runoff = 0.36 cfs @ 12.06 hrs, Volume= 0.027 af, Depth= 4.98" Routed to Pond 12P : Subsurface Infiltration Basin Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) CN Description 2,878 98 Paved parking, HSG C 2,878 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 75 0.0140 1.17 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" Subcatchment 1S: 2BP-I Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=2,878 sf Runoff Volume=0.027 af Runoff Depth=4.98" Flow Length=75' Slope=0.0140 '/' Tc=1.1 min CN=98 0.36 cfs This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 74HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: 2BP-I Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 1.00 0.06 0.00 0.00 2.00 0.13 0.02 0.00 3.00 0.20 0.07 0.00 4.00 0.27 0.12 0.00 5.00 0.36 0.19 0.00 6.00 0.45 0.27 0.01 7.00 0.55 0.36 0.01 8.00 0.68 0.48 0.01 9.00 0.83 0.63 0.01 10.00 1.03 0.82 0.02 11.00 1.36 1.14 0.03 12.00 2.50 2.27 0.24 13.00 3.86 3.63 0.03 14.00 4.19 3.95 0.02 15.00 4.39 4.16 0.01 16.00 4.54 4.31 0.01 17.00 4.67 4.43 0.01 18.00 4.77 4.54 0.01 19.00 4.86 4.63 0.01 20.00 4.95 4.71 0.01 21.00 5.02 4.79 0.00 22.00 5.09 4.86 0.00 23.00 5.16 4.92 0.00 24.00 5.22 4.98 0.00 25.00 5.22 4.98 0.00 26.00 5.22 4.98 0.00 27.00 5.22 4.98 0.00 28.00 5.22 4.98 0.00 29.00 5.22 4.98 0.00 30.00 5.22 4.98 0.00 31.00 5.22 4.98 0.00 32.00 5.22 4.98 0.00 33.00 5.22 4.98 0.00 34.00 5.22 4.98 0.00 35.00 5.22 4.98 0.00 36.00 5.22 4.98 0.00 37.00 5.22 4.98 0.00 38.00 5.22 4.98 0.00 39.00 5.22 4.98 0.00 40.00 5.22 4.98 0.00 41.00 5.22 4.98 0.00 42.00 5.22 4.98 0.00 43.00 5.22 4.98 0.00 44.00 5.22 4.98 0.00 45.00 5.22 4.98 0.00 46.00 5.22 4.98 0.00 47.00 5.22 4.98 0.00 48.00 5.22 4.98 0.00 49.00 5.22 4.98 0.00 50.00 5.22 4.98 0.00 51.00 5.22 4.98 0.00 52.00 5.22 4.98 0.00 53.00 5.22 4.98 0.00 54.00 5.22 4.98 0.00 55.00 5.22 4.98 0.00 56.00 5.22 4.98 0.00 57.00 5.22 4.98 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 58.00 5.22 4.98 0.00 59.00 5.22 4.98 0.00 60.00 5.22 4.98 0.00 61.00 5.22 4.98 0.00 62.00 5.22 4.98 0.00 63.00 5.22 4.98 0.00 64.00 5.22 4.98 0.00 65.00 5.22 4.98 0.00 66.00 5.22 4.98 0.00 67.00 5.22 4.98 0.00 68.00 5.22 4.98 0.00 69.00 5.22 4.98 0.00 70.00 5.22 4.98 0.00 71.00 5.22 4.98 0.00 72.00 5.22 4.98 0.00 This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 75HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment EX 1-I: Runoff = 1.19 cfs @ 12.07 hrs, Volume= 0.091 af, Depth= 4.98" Routed to Reach 4R : Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) CN Description 9,508 98 Paved roads w/curbs & sewers, HSG C 9,508 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.3 100 0.0140 1.24 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 0.3 49 0.0180 2.72 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.6 149 Total Subcatchment EX 1-I: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=9,508 sf Runoff Volume=0.091 af Runoff Depth=4.98" Flow Length=149' Tc=1.6 min CN=98 1.19 cfs This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.