Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

eak runoff rates and volumes for stormwater leaving the site for the 2, 10, and 100-year storm events at each design point respectively. It is our opinion that the calculations provided and summarized above demonstrate compliance with the Township ordinance 25-29 Stormwater Control. 8

APPENDIX A EXISTING DRAINAGE CALCULATIONS

E1A E1B E1A E1B DISTURBED/IMPERVIOUS DISTURBED/PERVIOUS E2-P 8L E2A PERVIOUS EXISTING DISTURBED E1C E2-IMP E1C E2A IMPERVIOUS Pervious-w-offsite-Undisturbed E-DP 1 E-DP 2 E2B-IMP EXIST DP 1 EXIST DP 2 E2B IMPERVIOUS E2B-P 9L E2B PERVIOUS TOTAL EXISTING Routing Diagram for 24-223 DRAINAGE DESIGN-EXISTING-UPDATE Subcat Reach Pond Link Prepared by Jarmel Kizel Architects & Engnrs, Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC

24-223 DRAINAGE DESIGN-EXISTING-UPDATE Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (sq-ft) (subcatchment-numbers) 4,668 74 >75% Grass cover, Good, HSG C (E1C, E2-P, E2B-P) 1,220 98 Impervious (E1C) 2,721 71 Meadow, non-grazed, HSG C (E1C) 78,560 98 Paved parking, HSG C (E1A, E2-IMP, E2B-IMP) 708 98 Roof-offsite (E1C) 4,643 98 Roofs, HSG C (E2-IMP) 7,928 72 Woods/grass comb., Good, HSG C (E1B) 32,886 70 wooded (E1C)

24-223 DRAINAGE DESIGN-EXISTING-UPDATE Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (sq-ft) Group Numbers 0 HSG A 0 HSG B 98,520 HSG C E1A, E1B, E1C, E2-IMP, E2-P, E2B-IMP, E2B-P 0 HSG D 34,814 Other E1C

24-223 DRAINAGE DESIGN-EXISTING-UPDATE Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (sq-ft) (sq-ft) (sq-ft) (sq-ft) (sq-ft) (sq-ft) Cover Numbers 0 0 4,668 0 0 4,668 >75% Grass cover, Good E1C, E2-P, E2B-P 0 0 0 0 1,220 1,220 Impervious E1C 0 0 2,721 0 0 2,721 Meadow, non-grazed E1C 0 0 78,560 0 0 78,560 Paved parking E1A, E2-IMP, E2B-IMP 0 0 0 0 708 708 Roof-offsite E1C 0 0 4,643 0 0 4,643 Roofs E2-IMP 0 0 7,928 0 0 7,928 Woods/grass comb., Good E1B 0 0 0 0 32,886 32,886 wooded E1C

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Runoff = 2.94 cfs @ 12.01 hrs, Volume= 18,871 cf, Depth= 3.24" Routed to Link 8L : EXISTING DISTURBED Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 69,966 98 Paved parking, HSG C 69,966 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.7 100 0.0650 2.30 Sheet Flow, Parking lot Smooth surfaces n= 0.011 P2= 3.47" 1.4 343 0.0420 4.16 Shallow Concentrated Flow, Parking lot Paved Kv= 20.3 fps 2.1 443 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 6 Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Hydrograph Runoff 2.94 cfs 3 NOAA 24-hr D 2-Year-2020 Rainfall=3.47" P2=3.47" 2 Runoff Area=69,966 sf Runoff Volume=18,871 cf Flow (cfs) Runoff Depth=3.24" Flow Length=443' 1 Tc=2.1 min CN=98 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment E1B: E1B DISTURBED/PERVIOUS Runoff = 0.11 cfs @ 12.07 hrs, Volume= 728 cf, Depth= 1.10" Routed to Link 8L : EXISTING DISTURBED Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 7,928 72 Woods/grass comb., Good, HSG C 7,928 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.9 25 0.5000 0.22 Sheet Flow, Wooded Woods: Light underbrush n= 0.400 P2= 3.47" 0.5 75 0.0800 2.35 Sheet Flow, Paved area Smooth surfaces n= 0.011 P2= 3.47" 1.4 364 0.0480 4.45 Shallow Concentrated Flow, Parking lot Paved Kv= 20.3 fps 3.8 464 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 8 Subcatchment E1B: E1B DISTURBED/PERVIOUS Hydrograph 0.125 Runoff 0.12 0.11 cfs 0.115 0.11 NOAA 24-hr D 0.105 0.1 2-Year-2020 Rainfall=3.47" 0.095 0.09 P2=3.47" 0.085 0.08 Runoff Area=7,928 sf 0.075 Runoff Volume=728 cf Flow (cfs) 0.07 0.065 0.06 Runoff Depth=1.10" 0.055 0.05 Flow Length=464' 0.045 0.04 Tc=3.8 min 0.035 0.03 CN=72 0.025 0.02 0.015 0.01 0.005 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)