J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 57 Summary for Pond MH-C: MH-Cto MH-D [57] Hint: Peaked at 616.95' (Flood elevation advised) Inflow Area = Inflow = Outflow = Primary = 1.209 ac, 37.17% Impervious, Inflow Depth = 7.49" for 100 yr event 7.43 cfs@ 12.20 hrs, Volume= 0.755af 7.43 cfs@ 12.20 hrs, Volume= 0.755 af, Atten= 0%, Lag= 0.0min 7.43 cfs @ 12.20 hrs, Volume= 0.755af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 616.95' @ 12.20 hrs Device Routing #1 Primary Invert Outlet Devices 597.00' 12.0" Round Culvert L= 205.0' Ke= 0.500 Inlet / Outlet lnvert= 597.00’ / 592.70' S= 0.0210 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior Primary OutFlow Max=7.43 cfs @ 12.20 hrs HW=616.93' TW=0.00’ (Dynamic Tailwater) 1=Culvert (Barrel Controls 7.43 cfs @ 9.46 fps) Pond MH-C: MH-Cto MH-D Hydrograph 43 cfs | 7.43 cfs m. i i S 4 1 01 I Inflow I Primary Inflow Area=1.209 ac Peak Elev=616.95' ! ! 12 .0 " Round Culvert n=0.020 L=205.0' S=0.0210 V 2 3 45 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 Time (hours)

Post Development West Orange B_03 01 12 Prepared by TRC Engineers, Inc. Type III 24-hr 100 yr Rainfall=8.72" Printed 3/14/2012 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 58 Summary for Link 3L: to MH D Inflow Area = Inflow = Primary = 2.316 ac, 21.40% Impervious, Inflow Depth = 7.25" for 100 yr event 11.37cfs@ 12.23 hrs, Volume= 1.399 af 11.37cfs@ 12.23 hrs, Volume= 1.399 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Link 3L: to MH D Hydrograph 1 --- i--i-- 1-- i -- 1-- i -- i--- i -- i --- —i—i—i—i— t i i i i i i i i i i i i 1 i 11 i i i i I 11 37 Wf 1 1 — 11.37 cfs p--1 1 Area 1 i I T 1 1 ’I T 1 I" 1 1 1 1 i i 1 1 1 1 1 1 1 1 i_ i 1 1 1 1 1 r ■ "1 tI V " i■ 1 1 i i i i 1 1 1 i 1 1 i 1 1 1 i 1 i i i i i i i i 1 i i i i 1 i i i i i i i 1 1 i i i i i 1 i i i 1 i i i i 1 i i i i i 1 1 i i i i i i 1 _ _ l L __i i_ _ _ . _ . L . i 1 1 i i i 1 1 l 1 V i 1 i i i 1 L . L _ J _ J - . L _ 1 _ J _ -J------------- •_ 1 i 1 1 1 1 i i i 1 1 1 i I 1 1 i i i I -4 . 4 i 1 1 i i i i i i 1 1 1 i i i i 1 i i t - 1 — J- —I i i i i 1 1 1 i i i 1 i 1 ■ i i 1,. ----| ---- 4 - - - » ■ -I- - H - +• - 4--------1 - L . i i i i i i 1 • 1 . ' ' 1 V ■ • i 1 11 1 i i i -i— r - -t ■ Inflow 12 =2. 316 ac - 11 109 9-_ I u. ■ Inflow ■ Primary I6 5- 4-: 3 - - r - r - i - 2 ; i .1 I . 11 1 l 1l ‘I-, V/////S///////S 04 0 ip u ip n ip n ipn ip ii ip ii ipmp h ip iiipn ip ii ip u pT1 12 34 5678 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) 1l 1 i

Post Development West Orange B_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 59 Summary for Link 4L: to MH 11 Inflow Area = Inflow = Primary = 5.076 ac, 24.87% Impervious, Inflow Depth = 6.92" for 100 yr event 29.82 cfs @ 12.14 hrs, Volume= 2.927 af 29.82 cfs @ 12.14 hrs, Volume= 2.927 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Link 4L: to MH 11 Hydrograph I— 1 .1 _ J i— ‘ X _ i L-i I Inflow j Primary I-2.Q ft? rf 32-: 29.82 cfs 3(H flow Area 5.076 ac 28: 26-i 24 22 20: 1816 14- 12 10: 8 6 i- - 4 2: Wmmw, ^//j___________ WtozmmmsA 0+ 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)

Post Development West Orange B_03 01 12 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 60 Summary for Subcatchment 4: PO-DA 4 Runoff = 0.75 cfs @ 1.18 hrs, Volume= 0.028 af, Depth= 0.37" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" •k k * Area (sf) CN Description Impervious, HSG D 4,334 98 Gravel road, HSG D 5,398 98 80 Grass cover, Good, HSG D 14,366 Meadow, non-qrazed, HSG D 15.808 78 39,906 84 Weighted Average 30,174 75.61% Pervious Area 79 24.39% Impervious Area 9,732 98 Length (feet) 100 Tc (min) 9.6 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0500 0.17 Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.5 120 0.0830 Shallow Concentrated Flow, 4.32 Grassed Waterway Kv=15.0fps 145 0.7 0.0480 Shallow Concentrated Flow, 3.29 Grassed Waterway Kv= 15.0 fps 10.8 365 Total Subcatchment 4: PO-DA 4 Hydrograph in 0 -M oC 0.75-: 0.70.65• 0.6/ 0.55_ 0.5o. 0.45* | 0.4“■ 0.350.30.250.20.150.10.050- — -- - rr - — . r- r-■ 1 i 1 1 “ _ *1 —r ~ r _ i i “ i— i r- — -- -■ ~— J __ _ _l_ _ — -- _ _ — _ _ L _ — R l i Rur —i—i—i—i—i—i—i—i—i—r—i— 1 1 1 1 l 1 1 1 1 1 1 ~ -1 t - i i-r — t — i “ “i“ ~ r ■■ T ~ n — i i i i i i i i i i i NJ DEP 2-hr NJDEP r i i RainfalN1.25'r unoff Area=39,906 sf i.i i #i ii i toff Volume=0.028 af riii i 1 i l l r* i i _ i_ _ _ -- _ _ — _ , _ L _ J Lt 1i L . _ -- 1 1 234 Runoff bepth=d.37" 5 6 7 1 l 1 1 t I \ III 1 l I 1 1 1 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) i i i i^iow Lengin-^bo i i“ i i i i Tc=10;8 rriiri 1 1 1 ! i i lit ! 1 1 : 1 1 CN=79/98 1 t 1 1 1 i i : III ( 1 1 1 ! 1 1 I 1 1 1

Post Development West Orange B_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Printed 3/14/2012 Page 61 Summary for Subcatchment 5A: PO-DA 5A Runoff = 1.19 cfs@ 1.12 hrs, Volume= 0.036 af, Depth= 0.59" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" * * Area (sf) CN Description 15,734 98 Impervious, HSG D 8,318 80 Grass cover, Good, HSG D 78 Meadow, non-grazed, HSG D 7.713 88 Weighted Average 31,765 79 50.47% Pervious Area 16,031 15,734 98 49.53% Impervious Area Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0730 2.59 Description Tc (min) 1.0 Length (feet) 150 0.5 135 0.0590 4.93 Shallow Concentrated Flow, 0.8 180 0.0330 3.69 Shallow Concentrated Flow, 0.2 34 0.0190 2.80 Sheet Flow, Smooth surfaces n= 0.011 P2=3.42" Paved Kv= 20.3 fps Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps 499 Total, Increased to minimum Tc = 6.0 min 2.5 Subcatchment 5A: PO-DA 5A Hydrograph d .19 cfs NJ DEP 2-hr NJDEP / Rainfall=1.25" Runoff Area=31,765 sf Runoff Volume=0.036 af Runoff Depth=0.59" / z Flow Length=499' £ Tc=6.0 min %% CN=79/98 i . I I I I .1 i' 0 1 2 3 4 5S7 3 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tims (hours)

Post Development West Orange B_03 01 12 NJ DEP 2-hr NJDEP Rainfall-1.25" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 62 Summary for Subcatchment 5B: PO-DA 5B Runoff = 1.38cfs@ 1.11 hrs, Volume= 0.040af, Depth= 0.81" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" * * * Area (sf) CN Description 16,509 98 Impervious, HSG D 6,800 91 Gravel, HSG D 2,441 80 Grass cover, HSG D 25,750 94 Weighted Average 9,241 88 35.89% Pervious Area 16,509 98 64.11 % Impervious Area Tc (min) 1.1 Length (feet) 150 Slope (ft/ft) 0.0530 Velocity (ft/sec) 2.28 0.3 110 0.0680 5.29 Shallow Concentrated Flow, 0.5 95 0.0260 3.27 Shallow Concentrated Flow, Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Paved Kv= 20.3 fps Paved Kv= 20.3 fps 355 Total, Increased to minimum Tc = 6.0 min 1.9 Subcatchment 5B: PO-DA 5B Hydrograph -—r 1.38 I NJ: DEP 2-hr NJDEP | ; Rainfall=1.25" Runoff Area=25,750 sf 1- Runoff Volume=0.040 af / Runoff Depth-0.81" Flow Length=355' Tc=6.0 min CN=88/98 % o9 10 11 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 i (hours)

Post Development West Orange B_03 01 12 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC NJ DEP 2-hrNJDEP Rainfall=1.25" Printed 3/14/2012 Page 63 Summary for Subcatchment 6: PO-DA 6 1.60 cfs @ Runoff = 1.24 hrs, Volume= 0.067 af, Depth3 0.28" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span3 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hrNJDEP Rainfall=1.25" Area (sf) 13,009 47,083 39,774 853 22,963 123,682 110,673 13,009 * * * Tc (min) 9.6 Length (feet) 100 CN 98 85 80 78 73 82 81 98 Description Impervious, HSG D Yard stone, HSG D Grass cover, Good, HSG D Meadow, non-grazed, HSG D Brush, Good, HSG D Weighted Average 89.48% Pervious Area 10.52% Impervious Area Slope (ft/ft) 0.0500 Velocity (ft/sec) 0.17 Capacity (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.3 80 0.0880 4.45 0.2 40 0.3130 2.80 Shallow Concentrated Flow, Grassed Waterway Kv=15.0fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.2 30 0.0330 2.92 Shallow Concentrated Flow, 4.0 296 0.0060 1.25 Shallow Concentrated Flow, Yard stone Unpaved Kv= 16.1 fps Unpaved Kv= 16.1 fps 14.3 546 Total

Post Development West Orange B_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 64 Subcatchment 6: PO-DA 6 Hydrograph “—i—i—i—r iitii ,60 cfe i ; NJi DEP 2-hrNJDEP j | Rainfall=1.25" Runoff Area=123,682 sf Runaff Volume=0.067! af g 1- i ! Runoff Depth=0.28" : I Flow Length-546* Tc=14;.3 min i i i i CN=81/98 > .< i i i i 0 1 2 34 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours)

Post Development West Orange B_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 65 Summary for Subcatchment 9A: PO-DA 9A Runoff = 0.53 cfs @ 1.43 hrs, Volume= 0.031 af, Depth= 0.33" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" * * * Area (sf) CN Description 650 98 Impervious, HSG D 1,367 98 Gravel road, HSG D 46,220 85 Yard stone, HSG D 48,237 86 Weighted Average 46,220 85 95.82% Pervious Area 2,017 98 4.18% Impervious Area Tc (min) 21.7 Length (feet) 100 2.5 Description Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0070 0.08 Sheet Flow, Yard Stone 190 0.0060 1.25 Shallow Concentrated Flow, Yard Stone 4.3 130 0.0010 0.51 Shallow Concentrated Flow, Yard Stone 28.5 420 Total n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Un paved Kv= 16.1 fps Subcatchment 9A: PO-DA 9A Hydrograph — D.53 cfs | —i uta---- 1 0.5 0.5 NJ DEP 2-hr NJDEP 0.45- RainfalNt.25" 0.4- Runoff Area=48,237 sf 0.35- Runoff Volume=0.031 af — Runoff Depth=0.33" 0.3 Flow Length=420' “■ 0 25_ Tc=28.5 min 0.2- CN=85/98 0.15 0.1 0.05 01 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours)

Post Development West Orange B_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Printed 3/14/2012 Page 66 Summary for Subcatchment 9C: PO-DA 9C Runoff = 1.45 cfs @ 1.22 hrs, Volume= 0.058 af, Depth= 0.57" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" * * * Area (sf) CN Description 1,117 98 Impervious, HSG D 18,457 98 Gravel road, HSG D 85 Yard stone, HSG D 33.086 52,660 90 Weighted Average 33,086 85 62.83% Pervious Area 19,574 98 37.17% Impervious Area Tc (min) 12.6 Length (feet) 100 1.1 - Slope Velocity Capacity (ft/ft) (fl/sec) (cfs) 0.0270 0.13 Description Sheet Flow, Yard Stone 160 0.0220 2.39 Shallow Concentrated Flow, Yard Stone 1.3 120 0.0085 1.48 Shallow Concentrated Flow, Yard Stone 15.0 380 Total n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Un paved Kv= 16.1 fps Subcatchment 9C: PO-DA 9C Hydrograph >1 1 1 1 1 1 . 1 1 1 1 ■i i i i j .i i / i i i i i 1 ii i i i i i ii* *i i i i i i i i i . 4 5 cfs i i i i i i i —r1 i i i i i i ii 1 1 , 1 1 1 1 1 i i i i i i i i i i I i i i i i I i i i i i I ■ ’ — ■ I I I I I I II•I ■ ; Rainfall=1.25" Runoff Area=52,660 sf 1 - unoff Volume=0.058 af Runoff Depth=0.57" Flow Length=380' Tc=15,0 min CN=85/98 mm#mm 1 2 34 5678 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Time (hours)