241018_42 ERW_Stormwater Report_compiled

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 21HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Pond Basin 2: (new Pond) Inflow Area = 0.693 ac, 38.96% Impervious, Inflow Depth = 2.14" for 2-Year event Inflow = 1.45 cfs @ 12.08 hrs, Volume= 0.123 af Outflow = 0.67 cfs @ 12.26 hrs, Volume= 0.095 af, Atten= 54%, Lag= 10.6 min Primary = 0.67 cfs @ 12.26 hrs, Volume= 0.095 af Routed to Reach DP1-P : (new Reach) Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 16.61' @ 12.26 hrs Surf.Area= 0.031 ac Storage= 0.054 af Plug-Flow detention time= 232.3 min calculated for 0.095 af (77% of inflow) Center-of-Mass det. time= 139.4 min ( 935.4 - 796.0 ) Volume Invert Avail.Storage Storage Description #1A 14.00' 0.029 af 34.75'W x 39.22'L x 3.50'H Field A 0.109 af Overall - 0.037 af Embedded = 0.073 af x 40.0% Voids #2A 14.50' 0.037 af ADS_StormTech SC-740 +Cap x 35 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 35 Chambers in 7 Rows 0.066 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 15.40' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 16.30' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Primary 17.05' 3.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.66 cfs @ 12.26 hrs HW=16.61' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.17 cfs @ 5.07 fps) 2=Orifice/Grate (Orifice Controls 0.49 cfs @ 1.90 fps) 3=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.

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 22HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond Basin 2: (new Pond) - 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 5 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 37.22' Row Length +12.0" End Stone x 2 = 39.22' Base Length 7 Rows x 51.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 34.75' Base Width 6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height 35 Chambers x 45.9 cf = 1,607.9 cf Chamber Storage 4,769.7 cf Field - 1,607.9 cf Chambers = 3,161.8 cf Stone x 40.0% Voids = 1,264.7 cf Stone Storage Chamber Storage + Stone Storage = 2,872.6 cf = 0.066 af Overall Storage Efficiency = 60.2% Overall System Size = 39.22' x 34.75' x 3.50' 35 Chambers 176.7 cy Field 117.1 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 23HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond Basin 2: (new Pond) Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 Inflow Area=0.693 ac Peak Elev=16.61' Storage=0.054 af 1.45 cfs 0.67 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 24HydroCAD® 10.20-4b s/n 04431 © 2023 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=13,167 sf 0.00% Impervious Runoff Depth=2.90"Subcatchment PDA-1A (PERV): (new Subcat) Flow Length=203' Tc=5.9 min CN=78 Runoff=1.00 cfs 0.073 af Runoff Area=25,145 sf 100.00% Impervious Runoff Depth=4.98"Subcatchment PDA-1B (IMPERV): (new Flow Length=136' Tc=1.5 min CN=98 Runoff=3.16 cfs 0.240 af Runoff Area=58,772 sf 0.00% Impervious Runoff Depth=2.99"Subcatchment PDA-1B(PERV): (new Subcat) Flow Length=180' Tc=7.5 min CN=79 Runoff=4.41 cfs 0.336 af Runoff Area=11,760 sf 100.00% Impervious Runoff Depth=4.98"Subcatchment PDA-1C(IMPERV): (new Tc=1.0 min CN=98 Runoff=1.48 cfs 0.112 af Runoff Area=18,423 sf 0.00% Impervious Runoff Depth=2.90"Subcatchment PDA-1C(PERV): (new Subcat) Flow Length=123' Tc=7.2 min CN=78 Runoff=1.35 cfs 0.102 af Runoff Area=7,411 sf 0.00% Impervious Runoff Depth=2.72"Subcatchment PDA-2 (PERV.): (new Subcat) Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=0.55 cfs 0.039 af Inflow=4.41 cfs 0.767 afReach DP1-P: (new Reach) Outflow=4.41 cfs 0.767 af Inflow=0.55 cfs 0.039 afReach DP2-P: (new Reach) Outflow=0.55 cfs 0.039 af Inflow=6.72 cfs 0.576 afReach PDA-1B: (new Reach) Outflow=6.72 cfs 0.576 af Inflow=2.49 cfs 0.214 afReach PDA-1C: (new Reach) Outflow=2.49 cfs 0.214 af Peak Elev=15.76' Storage=0.257 af Inflow=6.72 cfs 0.576 afPond Basin 1: (new Pond) Outflow=1.66 cfs 0.509 af Peak Elev=17.21' Storage=0.062 af Inflow=2.49 cfs 0.214 afPond Basin 2: (new Pond) Outflow=2.28 cfs 0.186 af Total Runoff Area = 3.092 ac Runoff Volume = 0.902 af Average Runoff Depth = 3.50" 72.60% Pervious = 2.245 ac 27.40% Impervious = 0.847 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 25HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1A (PERV): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 1.00 cfs @ 12.13 hrs, Volume= 0.073 af, Depth= 2.90" Routed to Reach DP1-P : (new Reach) 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 9,975 74 >75% Grass cover, Good, HSG C 3,192 89 Gravel roads, HSG C 13,167 78 Weighted Average 13,167 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.6 100 0.0725 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 103 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.9 203 Total Subcatchment PDA-1A (PERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=13,167 sf Runoff Volume=0.073 af Runoff Depth=2.90" Flow Length=203' Tc=5.9 min CN=78 1.00 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 26HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1B (IMPERV): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 3.16 cfs @ 12.07 hrs, Volume= 0.240 af, Depth= 4.98" Routed to Reach PDA-1B : (new Reach) 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 9,688 98 Roofs, HSG C 15,457 98 Paved parking, HSG C 25,145 98 Weighted Average 25,145 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.2 100 0.0200 1.43 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 0.3 36 0.0139 2.39 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.5 136 Total Subcatchment PDA-1B (IMPERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 3 2 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=25,145 sf Runoff Volume=0.240 af Runoff Depth=4.98" Flow Length=136' Tc=1.5 min CN=98 3.16 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 27HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1B(PERV): (new Subcat) Runoff = 4.41 cfs @ 12.15 hrs, Volume= 0.336 af, Depth= 2.99" Routed to Reach PDA-1B : (new Reach) 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 39,275 74 >75% Grass cover, Good, HSG C 19,497 89 Gravel roads, HSG C 58,772 79 Weighted Average 58,772 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.0400 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 80 0.0812 4.59 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.5 180 Total Subcatchment PDA-1B(PERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 4 3 2 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=58,772 sf Runoff Volume=0.336 af Runoff Depth=2.99" Flow Length=180' Tc=7.5 min CN=79 4.41 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 28HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1C(IMPERV): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 1.48 cfs @ 12.06 hrs, Volume= 0.112 af, Depth= 4.98" Routed to Reach PDA-1C : (new Reach) 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 11,760 98 Roofs, HSG C 11,760 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment PDA-1C(IMPERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=11,760 sf Runoff Volume=0.112 af Runoff Depth=4.98" Tc=1.0 min CN=98 1.48 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 29HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1C(PERV): (new Subcat) Runoff = 1.35 cfs @ 12.14 hrs, Volume= 0.102 af, Depth= 2.90" Routed to Reach PDA-1C : (new Reach) 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 4,377 89 Gravel roads, HSG C 14,046 74 >75% Grass cover, Good, HSG C 18,423 78 Weighted Average 18,423 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 100 0.0425 0.24 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.2 23 0.0100 1.61 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.2 123 Total Subcatchment PDA-1C(PERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=18,423 sf Runoff Volume=0.102 af Runoff Depth=2.90" Flow Length=123' Tc=7.2 min CN=78 1.35 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 30HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-2 (PERV.): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 0.55 cfs @ 12.11 hrs, Volume= 0.039 af, Depth= 2.72" Routed to Reach DP2-P : (new Reach) 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 6,431 74 >75% Grass cover, Good, HSG C 980 89 Gravel roads, HSG C 7,411 76 Weighted Average 7,411 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 84 0.0833 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" Subcatchment PDA-2 (PERV.): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 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 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=7,411 sf Runoff Volume=0.039 af Runoff Depth=2.72" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 0.55 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.