240916_40 ERW Stormwater Report FULL

NOAA 24-hr D 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 125HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Pond 10P: (new Pond) Inflow Area = 0.718 ac, 9.34% Impervious, Inflow Depth = 2.23" for 10-Year event Inflow = 1.37 cfs @ 12.18 hrs, Volume= 0.133 af Outflow = 1.37 cfs @ 12.18 hrs, Volume= 0.133 af, Atten= 0%, Lag= 0.0 min Primary = 1.37 cfs @ 12.18 hrs, Volume= 0.133 af Routed to Reach DP1 : TOP Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 0.43' @ 12.18 hrs Device Routing Invert Outlet Devices #1 Primary 0.00' 11.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.34 cfs @ 12.18 hrs HW=0.43' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.34 cfs @ 2.22 fps) Pond 10P: (new Pond) Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 Inflow Area=0.718 ac Peak Elev=0.43' 1.37 cfs 1.37 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 126HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Pond 10P: (new Pond) Storage Stage-Area-Storage Storage (acre-feet) 0 Elevation (feet) 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 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 127HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 10P: (new Pond) Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 0.00 0.00 1.00 0.00 0.01 0.00 2.00 0.00 0.02 0.00 3.00 0.00 0.02 0.00 4.00 0.00 0.02 0.00 5.00 0.00 0.02 0.00 6.00 0.01 0.02 0.01 7.00 0.01 0.03 0.01 8.00 0.01 0.03 0.01 9.00 0.01 0.04 0.01 10.00 0.03 0.06 0.03 11.00 0.08 0.10 0.08 12.00 0.73 0.31 0.73 13.00 0.23 0.17 0.23 14.00 0.11 0.12 0.11 15.00 0.08 0.10 0.08 16.00 0.06 0.09 0.06 17.00 0.05 0.08 0.05 18.00 0.04 0.07 0.04 19.00 0.04 0.07 0.04 20.00 0.04 0.07 0.04 21.00 0.04 0.06 0.04 22.00 0.03 0.06 0.03 23.00 0.03 0.06 0.03 24.00 0.03 0.06 0.03 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 0.00 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 52.00 0.00 0.00 0.00 53.00 0.00 0.00 0.00 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 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 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 0.00 65.00 0.00 0.00 0.00 66.00 0.00 0.00 0.00 67.00 0.00 0.00 0.00 68.00 0.00 0.00 0.00 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 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 128HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 10P: (new Pond) Elevation (feet) Storage (acre-feet) 0.00 0.000 0.01 0.000 0.02 0.000 0.03 0.000 0.04 0.000 0.05 0.000 0.06 0.000 0.07 0.000 0.08 0.000 0.09 0.000 0.10 0.000 0.11 0.000 0.12 0.000 0.13 0.000 0.14 0.000 0.15 0.000 0.16 0.000 0.17 0.000 0.18 0.000 0.19 0.000 0.20 0.000 0.21 0.000 0.22 0.000 0.23 0.000 0.24 0.000 0.25 0.000 0.26 0.000 0.27 0.000 0.28 0.000 0.29 0.000 0.30 0.000 0.31 0.000 0.32 0.000 0.33 0.000 0.34 0.000 0.35 0.000 0.36 0.000 0.37 0.000 0.38 0.000 0.39 0.000 0.40 0.000 0.41 0.000 0.42 0.000 0.43 0.000 0.44 0.000 0.45 0.000 0.46 0.000 0.47 0.000 0.48 0.000 0.49 0.000 0.50 0.000 0.51 0.000 0.52 0.000 0.53 0.000 0.54 0.000 0.55 0.000 0.56 0.000 0.57 0.000 Elevation (feet) Storage (acre-feet) 0.58 0.000 0.59 0.000 0.60 0.000 0.61 0.000 0.62 0.000 0.63 0.000 0.64 0.000 0.65 0.000 0.66 0.000 0.67 0.000 0.68 0.000 0.69 0.000 0.70 0.000 0.71 0.000 0.72 0.000 0.73 0.000 0.74 0.000 0.75 0.000 0.76 0.000 0.77 0.000 0.78 0.000 0.79 0.000 0.80 0.000 0.81 0.000 0.82 0.000 0.83 0.000 0.84 0.000 0.85 0.000 0.86 0.000 0.87 0.000 0.88 0.000 0.89 0.000 0.90 0.000 0.91 0.000 0.92 0.000 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 129HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Pond 11P: Existing Drywell System Inflow Area = 0.919 ac, 42.91% Impervious, Inflow Depth = 1.80" for 10-Year event Inflow = 1.15 cfs @ 12.07 hrs, Volume= 0.138 af Outflow = 0.33 cfs @ 12.49 hrs, Volume= 0.138 af, Atten= 71%, Lag= 25.3 min Discarded = 0.04 cfs @ 12.49 hrs, Volume= 0.051 af Primary = 0.29 cfs @ 12.49 hrs, Volume= 0.087 af Routed to Reach DP2 : CHANNEL Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 609.66' @ 12.49 hrs Surf.Area= 0.020 ac Storage= 0.031 af Plug-Flow detention time= 93.6 min calculated for 0.137 af (100% of inflow) Center-of-Mass det. time= 93.7 min ( 886.3 - 792.6 ) Volume Invert Avail.Storage Storage Description #1 606.75' 0.050 af 19.00'W x 46.00'L x 8.00'H Prismatoid 0.161 af Overall - 0.037 af Embedded = 0.124 af x 40.0% Voids #2 607.75' 0.037 af 6.00'D x 5.66'H Vertical Cone/Cylinder x 10 Inside #1 0.086 af Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 606.75' 1.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 603.00' #2 Primary 608.00' 15.0" Round Culvert L= 16.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 608.00' / 607.75' S= 0.0156 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.23 sf #3 Device 2 608.00' 3.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 2 611.25' 4.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 2 613.25' 4.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Discarded OutFlow Max=0.04 cfs @ 12.49 hrs HW=609.66' (Free Discharge) 1=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.29 cfs @ 12.49 hrs HW=609.66' (Free Discharge) 2=Culvert (Passes 0.29 cfs of 4.74 cfs potential flow) 3=Orifice/Grate (Orifice Controls 0.29 cfs @ 5.96 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Broad-Crested Rectangular Weir ( Controls 0.00 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 130HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Pond 11P: Existing Drywell System Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 Inflow Area=0.919 ac Peak Elev=609.66' Storage=0.031 af 1.15 cfs 0.33 cfs 0.04 cfs 0.29 cfs Pond 11P: Existing Drywell System Surface Storage Stage-Area-Storage Storage (acre-feet) 0.0850.080.0750.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 Surface/Horizontal/Wetted Area (acres) 0.020.0190.0180.0170.0160.0150.0140.0130.0120.0110.010.0090.0080.0070.0060.0050.0040.0030.0020.0010 Elevation (feet) 614 613 612 611 610 609 608 607 Prismatoid Vertical Cone/Cylinder 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 131HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 11P: Existing Drywell System Time (hours) Inflow (cfs) Storage (acre-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0.000 606.75 0.00 0.00 0.00 2.50 0.01 0.000 606.78 0.01 0.01 0.00 5.00 0.01 0.000 606.80 0.01 0.01 0.00 7.50 0.02 0.001 606.84 0.02 0.02 0.00 10.00 0.05 0.003 607.13 0.02 0.02 0.00 12.50 0.33 0.031 609.66 0.33 0.04 0.29 15.00 0.14 0.018 608.62 0.20 0.03 0.17 17.50 0.06 0.013 608.15 0.07 0.03 0.04 20.00 0.02 0.011 607.97 0.03 0.03 0.00 22.50 0.01 0.009 607.80 0.03 0.03 0.00 25.00 0.00 0.005 607.40 0.02 0.02 0.00 27.50 0.00 0.001 606.83 0.02 0.02 0.00 30.00 0.00 0.000 606.75 0.00 0.00 0.00 32.50 0.00 0.000 606.75 0.00 0.00 0.00 35.00 0.00 0.000 606.75 0.00 0.00 0.00 37.50 0.00 0.000 606.75 0.00 0.00 0.00 40.00 0.00 0.000 606.75 0.00 0.00 0.00 42.50 0.00 0.000 606.75 0.00 0.00 0.00 45.00 0.00 0.000 606.75 0.00 0.00 0.00 47.50 0.00 0.000 606.75 0.00 0.00 0.00 50.00 0.00 0.000 606.75 0.00 0.00 0.00 52.50 0.00 0.000 606.75 0.00 0.00 0.00 55.00 0.00 0.000 606.75 0.00 0.00 0.00 57.50 0.00 0.000 606.75 0.00 0.00 0.00 60.00 0.00 0.000 606.75 0.00 0.00 0.00 62.50 0.00 0.000 606.75 0.00 0.00 0.00 65.00 0.00 0.000 606.75 0.00 0.00 0.00 67.50 0.00 0.000 606.75 0.00 0.00 0.00 70.00 0.00 0.000 606.75 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 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 132HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 11P: Existing Drywell System Elevation (feet) Surface (acres) Storage (acre-feet) 606.75 0.020 0.000 606.85 0.020 0.001 606.95 0.020 0.002 607.05 0.020 0.002 607.15 0.020 0.003 607.25 0.020 0.004 607.35 0.020 0.005 607.45 0.020 0.006 607.55 0.020 0.006 607.65 0.020 0.007 607.75 0.020 0.008 607.85 0.020 0.009 607.95 0.020 0.010 608.05 0.020 0.012 608.15 0.020 0.013 608.25 0.020 0.014 608.35 0.020 0.015 608.45 0.020 0.016 608.55 0.020 0.018 608.65 0.020 0.019 608.75 0.020 0.020 608.85 0.020 0.021 608.95 0.020 0.022 609.05 0.020 0.024 609.15 0.020 0.025 609.25 0.020 0.026 609.35 0.020 0.027 609.45 0.020 0.028 609.55 0.020 0.029 609.65 0.020 0.031 609.75 0.020 0.032 609.85 0.020 0.033 609.95 0.020 0.034 610.05 0.020 0.035 610.15 0.020 0.037 610.25 0.020 0.038 610.35 0.020 0.039 610.45 0.020 0.040 610.55 0.020 0.041 610.65 0.020 0.043 610.75 0.020 0.044 610.85 0.020 0.045 610.95 0.020 0.046 611.05 0.020 0.047 611.15 0.020 0.049 611.25 0.020 0.050 611.35 0.020 0.051 611.45 0.020 0.052 611.55 0.020 0.053 611.65 0.020 0.055 611.75 0.020 0.056 611.85 0.020 0.057 611.95 0.020 0.058 612.05 0.020 0.059 612.15 0.020 0.060 612.25 0.020 0.062 612.35 0.020 0.063 612.45 0.020 0.064 Elevation (feet) Surface (acres) Storage (acre-feet) 612.55 0.020 0.065 612.65 0.020 0.066 612.75 0.020 0.068 612.85 0.020 0.069 612.95 0.020 0.070 613.05 0.020 0.071 613.15 0.020 0.072 613.25 0.020 0.074 613.35 0.020 0.075 613.45 0.020 0.076 613.55 0.020 0.077 613.65 0.020 0.077 613.75 0.020 0.078 613.85 0.020 0.079 613.95 0.020 0.080 614.05 0.020 0.081 614.15 0.020 0.081 614.25 0.020 0.082 614.35 0.020 0.083 614.45 0.020 0.084 614.55 0.020 0.085 614.65 0.020 0.085 614.75 0.020 0.086 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 133HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Pond 12P: Subsurface Infiltration Basin Inflow Area = 0.687 ac, 28.51% Impervious, Inflow Depth = 3.24" for 10-Year event Inflow = 1.93 cfs @ 12.09 hrs, Volume= 0.185 af Outflow = 0.28 cfs @ 13.01 hrs, Volume= 0.185 af, Atten= 85%, Lag= 54.9 min Discarded = 0.11 cfs @ 13.01 hrs, Volume= 0.137 af Primary = 0.18 cfs @ 13.01 hrs, Volume= 0.048 af Routed to Pond 11P : Existing Drywell System Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 623.31' @ 13.01 hrs Surf.Area= 0.061 ac Storage= 0.076 af Plug-Flow detention time= 196.3 min calculated for 0.185 af (100% of inflow) Center-of-Mass det. time= 196.2 min ( 999.1 - 802.9 ) Volume Invert Avail.Storage Storage Description #1A 621.50' 0.056 af 39.50'W x 67.70'L x 3.50'H Field A 0.215 af Overall - 0.076 af Embedded = 0.139 af x 40.0% Voids #2A 622.00' 0.076 af ADS_StormTech SC-740 +Cap x 72 Inside #1 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 72 Chambers in 8 Rows 0.132 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 621.50' 1.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 619.00' #2 Primary 619.43' 12.0" Round Culvert L= 42.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 619.43' / 613.00' S= 0.1531 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf #3 Device 2 622.50' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 2 623.25' 10.0" W x 4.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 2 624.50' 0.5' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Discarded OutFlow Max=0.11 cfs @ 13.01 hrs HW=623.31' (Free Discharge) 1=Exfiltration ( Controls 0.11 cfs) Primary OutFlow Max=0.18 cfs @ 13.01 hrs HW=623.31' (Free Discharge) 2=Culvert (Passes 0.18 cfs of 6.13 cfs potential flow) 3=Orifice/Grate (Orifice Controls 0.14 cfs @ 4.04 fps) 4=Orifice/Grate (Orifice Controls 0.04 cfs @ 0.77 fps) 5=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) This document was created by an application that

ate (Orifice Controls 0.14 cfs @ 4.04 fps) 4=Orifice/Grate (Orifice Controls 0.04 cfs @ 0.77 fps) 5=Sharp-Crested Rectangular Weir ( Controls 0.00 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.