J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. NJ DEP 2-hr NJDEP Rainfall=1.25" Printed 3/4/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 67 Summary for Subcatchment 1S: EX-DA 1 Runoff = 0.83 cfs @ 1.29 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.041 af, Depth= 0.27" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= Area (sf) CN Description * # 11,158 661 53,293 14,189 98 98 79 73 Paved road, HSG D Gravel road, HSG D Woods/grass comb., Good, HSG D Brush, Good, HSG D 79,301 67,482 11,819 81 78 98 Weighted Average 85.10% Pervious Area 14.90% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 16.9 150 0.0270 0.15 1.3 270 0.0520 3.42 18.2 420 Total Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Subcatchment 1S: EX-DA 1 Hydrograph 1 0.83 - 4 ---------I ------ _ Jl i I __ L _ J___ I___ 0.8 _J . . L . J . J _______ 0 75 L .. J __ ' __ L . . J __ ' __ 0I __ J 0 I • 4 - -I _ J. - 4- - 4 - • I - - A - 4 - . x.-----1- _ L _ J _l 1 __ J __ I l i L-i • 1 ____ J ____ t L _ J 0 650.6- 0 550.55 0.45- 0.40.350.30.25-_ 4 -------I _ . 1 . - I -X _ NJ DEP 2-hr NJDEP Rainfall=1.25” Runoff Area=79,301 sf Runoff Volume=0.041 af Runoff Depth=0.277 Flow Length=420' Tc=18.2 min - 4 -------1 _ _ 0.20.15 ____I ____ J . J . 0.1- __L _ 4 .. j _ j — J - J. 0.05 o7 I -----I ------4 - 4 - - - I ____U . 1 ---J ______ 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) 0.01 hrs

Pre-Development West Orange with ponds 2 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 68 Summary for Subcatchment 2S: EX-DA2 Runoff = 1.34 hrs, Volume3 0.22 cfs @ Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.012 af, Depth3 0.34" Pervious/lmperv., Time Span3 0.00-30.00 hrs, Area (sf) CN Description * * 4,190 10,038 3,705 98 Paved road, HSG D 80 Grass, Good, HSG 73 Brush, Good, HSG D 17,933 13,743 4,190 83 Weighted Average 78 76.64% Pervious Area 98 23.36% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 21.8 150 0.0400 D Description (cfs) Sheet Flow, 0.11 Woods: Light underbrush n= 0.400 P2= 3.42” 1.1 240 0.0630 22.9 390 Total Shallow Concentrated Flow, 3.76 Grassed Waterway Kv= 15.0 fps Subcatchment 2S: EX-DA2 Hydrograph -—i—i—r 0.2! 0.2 -- ------ i—r i “ — r ~ t - -i— T __ I - _ _ _L _ J._ _ _ _ _ __ _ _ _ I_ __ _ _ _I_ 1___ _ _ _ I_ _ _ ___ ___________ _ _ _ t__ I__ I__ 1___ I__ t cmcfsl;::;!;: ---- I------- I1 I Ml 1 0.2 0.12 0.11 NJ DEP 2-hr NJDEP Rainfall=1:.25" unoff Area=:17,933 sf I Rui noff Vplume=0.p11 af 1"1"“ ___ I _ ___I __ i . ------1 _ _ Runoff Depth=0.34’* L _ J _ J - -__I_1__ l_ v : Flow Length=390 iiiiii“iiii Tc=22.9 min ; CN=78/98 ----t - - t - 0.22 0.21 0.19 0.18 0.17 0.16 0.15 0.14 0.13 -i—;—;—i—r - - y- - *■ — i — r- I I I I i 'i tl m ____ L _ J ______ I ____ r -r ■ T“ -i- _i__ i__i _ i— i. i-i rrr -_u _J 0.1 0 09 0.08 0.07 0.06 0.05 0.04 0.03 _ _ i_i__i_ iii t- - _i__j —i__ — r“i —i“ 1 J _____ I - __ L _ J------ l_ L - J 0.02 -r-T”T““r“r-r“n- T ------I ------X---------- 1 ------ _ 1 __ J . _ J ______ I ____I ____L _ J _ f I I I I • I “ r - t - -i —i— r - r 1_ _ i —!_ _ _1 — i _ j __(_ _ _•_ _L_ _ _ ■i— i —r 0.01 234 5 67 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) dt= 0.01 hrs

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. NJ DEP 2-hr NJDEP Rainfall=1.25" Printed 3/4/2012 Page 69 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: EX-DA 3 Runoff = 3.97 cfs @ 1.12 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.116 af, Depth= 0.49" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * ★ * * 3,042 35,019 29,686 30,906 26,372 98 98 91 80 78 Impervious, HSG D Gravel road, HSG D Gravel, HSG D Grass, Good, HSG D Meadow, non-grazed, HSG D 125,025 86,964 38,061 88 83 98 Weighted Average 69.56% Pervious Area 30.44% Impervious Area Tc (min) Length (feet) 4.0 150 0.0070 0.63 1.6 350 0.0600 3.67 5.6 500 Total, Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) Sheet Flow, Gravel Storage Area n= 0.020 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Increased to minimum Tc = 6.0 min Subcatchment 3S: EX-DA 3 Hydrograph I^RunoffJ 97 cfs 72 / _j / _ _ L _ J _ __ _L_J /■ i Flow Length=500’ ' - 0 1 2 3 f 4 56 7 8 r ; NJ DEP 2-hr NJDEP Rainfall=1.25" Runoff Area=125,025 sf Runoff Volume=0.116 af Runoff Depth=0.49" r Tc=6.0 min 4 - 4 4 - 4 CN=83/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)

Pre-Development West Orange with ponds 2 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 3/4/2012 Page 70 Summary for Subcatchment 4S: EX-DA 4 Runoff = 2.42 cfs @ 1.21 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.094 af, Depth= 0.62" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * * * * # 31,370 5,072 12,803 8,134 21,568 98 Paved road, HSG D 98 Gravel road, HSG D 91 Gravel, HSG D 85 Yard stone, HSG D 80 Grass, Good, HSG D 78,947 42,505 36,442 91 Weighted Average 84 53.84% Pervious Area 98 46.16% Impervious Area Tc (min) Length (feet) 12.3 150 0.0600 0.20 0.7 135 0.0460 Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, 3.22 Grassed Waterway Kv= 15.0 fps 1.2 310 0.0470 14.2 595 Total Shallow Concentrated Flow, 4.40 Paved Kv= 20.3 fps Subcatchment 4S: EX-DA 4 Hydrograph S ✓ — I i 1 i , i i i i I i 1 1 1 i i i i i i I 1 i i ' . i i i i i i i i i i i 1 2.42 cfs : 1 1 i . 1 i i i i i i i i i i i i ii ii i i ii » i i i i i i i i i i i i i i • i i i i i Rainfall=1.25V Runoff Arda-78,947; sf Runoff Vol,ume=0.094 af i Runoff Depth=0.62" : Flow Length=595' Tc-14L2;ir1irt I CN=84/98 % - -t —i—i— i— i ii y y y % Vs. 56 78 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

Pre-Development West Orange with ponds 2 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. Printed 3/4/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 71 Summary for Subcatchment 5S: EX-DA 5 Runoff = 1.20 cfs @ Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" 1.11 hrs, Volume= UH=SCS, Split 0.036 af, Depth= 0.92" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * 17,517 2,694 98 Paved road, HSG D 80 Grass cover , Good. HSG D 20,211 2,694 17,517 96 Weighted Average 80 13.33% Pervious Area 98 86.67% Impervious Area Tc (min) Length (feet) 0.8 100 0.0570 2.16 0.4 120 0.0790 5.71 0.3 50 0.0250 3.21 0.3 55 0.0320 3.63 1.8 325 Total, Increased to minimum Tc = 6.0 min Slope Velocity (ft/ft) (ft/sec) Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Subcatchment 5S: EX-DA 5 Hydrograph 1.20 cfs \m NJ DEP 2-hr NJDEP -i- Rainfall=1.25" Runoff Area=20,211 sf Runoff Volume=0.036 af Runoff Depth=0.92M Flow Length=325' Tc=6.0 min CN=80/98 y / y y * y 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) dt= 0.01 hrs

Pre-Development West Orange with ponds 2 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. Printed 3/4/2012 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 72 Summary for Subcatchment 6S: EX-DA 6 Runoff = 1.69 c f s @ 1.28 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" * * * * UH=SCS, Split 0.078 af, Depth= 0.28" Pervious/Imperv., Area (sf) CN Description 9,501 8,481 43,082 57,041 27.592 98 98 85 80 73 Paved road, HSG D Gravel road, HSG D Yard stone, HSG D Grass cover, Good, HSG D Brush, Good, HSG D 145,697 127,715 17,982 82 80 98 Weighted Average 87.66% Pervious Area 12.34% Impervious Area Tc Length (min) (feet) Time Span= 0.00-30.00 Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 13.2 150 0.0500 0.19 Sheet Flow, 0.1 30 0.0880 4.45 Shallow Concentrated Flow, 0.2 40 0.3130 2.80 Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.2 30 0.0330 2.92 Shallow Concentrated Flow, 3.2 240 0.0060 1.25 Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Unoaved Kv= 16.1 fps 16.9 490 Total hrs, dt= 0.01 hrs

Pre-Development West Orange with ponds 2 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. Printed 3/4/2012 HvdroCAD® 9.10 sin 06401 © 2009 HydroCAD Software Solutions LLC Page 73 Subcatchment 6S: EX-DA 6 Hydrograph ------------- :---- i-----r d .69 cfs IM '* — -1— J£ «. i1 2 : U 01 3 4 5 6 7 8 NJ DEP 2-hr NJDEP : i Rainfall=1.25" Runoff Area=145,697 sf Runoff Volum?=0.078 af Runoff Depth=0.28" Flow Length=490' Tc=16.9 min CN=80/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)

Pre-Development West Orange with ponds 2 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 3/4/2012 Page 74 Summary for Subcatchment 7S: EX-DA 7 Runoff = 1.20 c f s @ 1.16 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.040 af, Depth= 0.20" Pervious/lmperv., Area (sf) CN Description 805 2,198 10,157 86,177 5.402 98 98 85 80 73 Impervious, HSG D Gravel road, HSG D Yard stone, HSG D >75% Grass cover, Good, HSG D Brush, Good, HSG D 104,739 101,736 3,003 81 80 98 Weighted Average 97.13% Pervious Area 2.87% Impervious Area * ★ * Tc (min) Length (feet) 4.5 70 Slope Velocity Capacity (ft/ft) (ft/sec) Time Span= 0.00-30.00 hrs, Description (cfs) Sheet Flow, 0.1600 0.26 Grass: Dense n= 0.240 P2= 3.42" 0.8 70 0.0857 1.46 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 2.4 310 0.0200 2.12 7.7 450 Total Shallow Concentrated Flow, Grassed Waterwav Kv= 15.0 fps Subcatchment 7S: EX-DA 7 Hydrograph -— -—i------- 1—r ------- :----- 1---- 1---- r d .20 cfs NJ! DEP 2-hr NJDEP .-i-.jJ.-j-.j. Rainfall=1.25^' Runoff Area=104,739 sf Runoff Volume=0.040 af Runoff Depth=0.20" : Flow Length-450' iiiiii itii Tc=7L7 min CN=80/98 x / X 2 0 1 2 34 n 56 78 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs

Pre-Development West Orange with ponds 2 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 75 Summary for Subcatchment 8S: EX-DA 8 Runoff = 0.86 cfs @ 1.41 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.049 af, Depth= 0.55" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * ★ * 15,912 29,261 1.535 98 Impervious, HSG D 85 Yard stone, HSG D 80 Grass, Good, HSG D 46,708 30,796 15,912 89 Weighted Average 85 65.93% Pervious Area 98 34.07% Impervious Area Tc (min) Length (feet) 25.5 80 0.0030 0.05 Sheet Flow, Yard stone 0.5 80 0.0170 2.65 Shallow Concentrated Flow, 2.2 165 0.0060 1.25 Shallow Concentrated Flow, Yard Stone 0.2 60 0.0580 4.89 Shallow Concentrated Flow, Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Unpaved Kv= 16.1 fps Paved Kv= 20.3 fps 28.4 385 Total Subcatchment 8S: EX-DA 8 Hydrograph ~ i.. 0.95 . .1 _ _ 186 cfs _1 __ -L-1-- 0.855 - - - J > - ‘l L. I-.1. . 1 __ l ___ j ____ _ U - L - 4 -------------- 0.7-: . L . J. _ _ _ L _ J __ L*l .1.. 'A 1. _ J „ .j _ _ _ L _ J _ _ .I. 0.65- 0.6- 1 . - 4 ________ 0.55- __ L _ J _ _ _ _ i_ - _ l .. ; . j . . i-_ 0.50 45 . 0.4 ___ L _ 1________ 0.35 0.3 - _ L _ 4 - __ 0.250.25 iiiiiiiiiiii l l ' r. -i - L _ i ------- I — 4 -----L - 1 _ J --------1 ---- I — J , _ J - .i-J.- 0.75- —:—•—•—r~~"" i l i | ■ Runoff l | l - - L _ J _ J _ , 0.8 — L NJ DEP 2-hii NJDEP Rainfall=1.25" Runoff Area=46,708 sf RMnoffVpluiTie=0.p49iajf Runoff Depth=0.55';' Flow Length=385' Tc=28 4 min CN=85/98 _ L _ ' 0.15- •_j 0.1 ___t ___ i - J - - • _______l ___ 1 . J - . d.os- A 1 234 567 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 |

Pre-Development West Orange with ponds 2 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 76 Summary for Subcatchment 9A: EX-DA 9A Runoff = 0.23 c f s @ 1.50 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.015 af, Depth= 0.35" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * 1,344 20,580 98 85 Paved road, HSG D Yard stone, HSG D 21,924 20,580 1,344 86 85 98 Weighted Average 93.87% Pervious Area 6.13% Impervious Area Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) Tc (min) 31.4 120 0.0040 0.06 Sheet Flow, Yard stone n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph ----- L 1------------------ 1------- l------- I------- X---------- 1------- l------- I------- 1 - -J---------------1------- 1------- ----------------------------------------------------------- S—r —!“ 0.26-fT- ° A 0.23 cfs 0.24-r—r 0.23f • NJ DEP 2-hr NJDEP _ SajrifajliFir.iS'r ----1----(---- I------ )---- 1----1----»• - -I - H------- I---- t---- ♦ - H -— Runoff Area±21,924 sf i i i i i i i i 'i i i i Runoff Volume=O.015 af _L_i L-' Runoff bepth=0.35'' !: i--- i i -r-7 - i Flow Length=120' r i ir n r i r l - -i iSI6pe=Q 0040 7 r r r i TcF3l:4:rhin ii _ i_ —i— CN=J k —i — -i- • »---i t - -« 0.22 r “ t i i r ~ t --|■ - I - - 4 --1 -----1 -----I ------- 4 -------1 -----1 -----H - 4 -------1 ----- ------ - 4 ---------------1 1 ------------ - 4 - - 4 - t * - 4 -----1 ---- » ---- I ------ f ------ » ---- 1 ---- ----------------1 ---- I -----b - 2 0.15-; o. 0.14-j -; » 0.13- L.J i i » - 0.1t0.09 0.08 0.07-j 0.06 0.05 0.040.03- t i i - - i- - 4 t - -i- - -t , iii y - t - - -1— 0.02-: —• —i— *- - -f —i — riiiiriI 0.01 0 1 2 34 56 7 !_ _ j___ . f i ~ ”i” ---- t- - ♦ 1 1 - - I - t I - - I I - - 4 — - I 1 I ~ i f - 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) dt= 0.01 hrs