2026 05 Storm Water Management Report rcd 5 6 2026

2026-04 Proposed & Existing Conditions NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" 2026-04 Proposed & Existing Conditions NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Prepared by Dynamic Engineering Printed 5/5/2026 Prepared by Dynamic Engineering Printed 5/5/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 3 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 8S: PDA #1 - Impervious to Bio Summary for Subcatchment 9S: PDA #1 - Pervious to Bio Runoff = 0.24 cfs @ 1.08 hrs, Volume= 0.007 af, Depth= 1.03" Runoff = 0.04 cfs @ 1.13 hrs, Volume= 0.001 af, Depth= 0.17" Routed to Pond 2P : BIO BASIN Routed to Pond 2P : BIO BASIN Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Area (ac) CN Description Area (ac) CN Description 0.078 98 Paved parking, HSG D 0.068 80 >75% Grass cover, Good, HSG D 0.078

HSG D 0.068 80 >75% Grass cover, Good, HSG D 0.078 100.00% Impervious Area 0.068 100.00% Pervious Area Tc Length Slope Velocity Capacity Description Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) (min) (feet) (ft/ft) (ft/sec) (cfs) 0.4 42 0.0326 1.59 Sheet Flow, A-B 4.8 45 0.0450 0.16 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 4.09" Grass: Dense n= 0.240 P2= 4.09" 0.1 18 0.1180 5.53 Shallow Concentrated Flow, B-C (RIP-RAP) 0.2 29 0.0148 2.47 Shallow Concentrated Flow, B-C Unpaved Kv= 16.1 fps Paved Kv= 20.3 fps 0.5 60 Total 0.1 18 0.1180 5.53 Shallow Concentrated Flow, C-D (RIP-RAP) Unpaved Kv= 16.1 fps Subcatchment 8S: PDA #1 - Impervious to Bio 5.1 92 Total Hydrograph

Hydrograph Subcatchment 9S: PDA #1 - Pervious to Bio Runoff Hydrograph 0.24 cfs 0.26 0.24 NJ DEP 2-hr 0.04 0.04 cfs 0.038 Runoff 0.22 WQ Rainfall=1.25" 0.036 NJ DEP 2-hr 0.2 0.034 0.18 P2=4.09" 0.032 WQ Rainfall=1.25"

WQ Rainfall=1.25" 0.03 0.16 Runoff Area=0.078 ac 0.028 P2=4.09" Flow (cfs) 0.14 Runoff Volume=0.007 af 0.026 Runoff Area=0.068 ac 0.024 Runoff Depth=1.03" Flow (cfs) 0.12 0.022 0.02 Runoff Volume=0.001 af 0.1 Flow Length=60' 0.018 Runoff Depth=0.17" 0.08 Tc=0.5 min 0.016

" 0.08 Tc=0.5 min 0.016 0.014 Flow Length=92' 0.06 CN=98 0.012 Tc=5.1 min 0.04 0.01 0.02 0.008 CN=80 0.006 0 0.004 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 0.002 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)