J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 100 yr Rainfall=8.72" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 47 Summary for Subcatchment 3S: EX-DA 3 Runoff = 22.59 cfs @ 12.08 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 1.727 af, Depth= 7.22" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 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-qrazed, 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 i - .I . t I l. . l. . J — I ---------E ---- I ---- 7 - — — J l. i - J - -•--1 2423r . _ i __ 22-: I __ I__ _____ I 21 i ;i: 20j _ _ L_____ I . . 1 . 22.59 cfs - r—r-*t - ri 19 i 18*: 17i 16-: 15-; , £ 143 13-: I 12i Li. 11- 10-; 9-i 94 L — -i - 7:. 6: ; • , _ J . 3-i - 1. .. L . J. ____ 3 4 5 67 8 .1 - - L _ J . _ _ L _ 1 . ________________________I ____L _ J _________ ............................. I' 2 III - - i — r - t --------------------1 — p - r — i ------------------- 1 — i — i - ~ i — 2i 1-1 1 L - J. J_. Type III 24-hr 100 yr : Rainfall=8.72" Runoff Area=125,025 sf Runoff Volume=1.727 af :i: Runoff Depth=7.22" Flow Length=^500' Tc=6.0 niin CN=83/98 . I--- 5-; 4i II -m-\ * 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 Type III 24-hr 100 yr Rainfall=8.72" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 48 Summary for Subcatchment 4S: EX-DA 4 11.40 cfs @ 12.19 hrs, Volume= Runoff Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 1.143 af, Depth= 7.57" Pervious/lmperv., Time Span= Area (sf) CN Description 31,370 5,072 12,803 8,134 21,568 98 98 91 85 80 Paved road, HSG D Gravel road, HSG D Gravel, HSG D Yard stone, HSG D Grass, Good, HSG D 78,947 42,505 36,442 91 84 98 Weighted Average 53.84% Pervious Area 46.16% Impervious Area Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) 12.3 150 0.0600 0.20 Sheet Flow, 0.7 135 0.0460 3.22 Shallow Concentrated Flow, 1.2 310 0.0470 4.40 * ★ * ★ * Capacity (cfs) 0.00-30.00 hrs, dt= 0.01 Description Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps 595 14.2 Total Subcatchment 4S: EX-DA 4 Hydrograph | ■ Runoff j 11 40 cfs rr: 7 112 /- 10- • J _ - I _________ X _ - J _ - I - U — 4 _____________ I - _ & - 4- - U _ 1, _ J--- L,1, L _ i._ _X- ._L_ . _ X ______ Type III 24-hr HOOiyr Rainfall=8.72" Runoff Area=78,947 sf Runoff Volume=1.143 af Runoff Depth=t.57" Flow Length-595' 1 J X-i J Tc=14.2 rhirt I i;_L _ i _1 ;CN=84/98 J. - -I _ X _ J _ -I- - J .. . - - - -1- _ _ i_l___ | i i _ „ X _ ~ 1 2 3 4 5 __X 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) hrs

Pre-Development West Orange with ponds 2 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 49 Summary for Subcatchment 5S: EX-DA 5 Runoff = 3.89 cfs @ 12.08 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 0.317 af, Depth= 8.19" Split 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) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description 0.8 100 0.0570 2.16 Sheet Flow, 0.4 120 0.0790 5.71 Shallow Concentrated Flow, 0.3 50 0.0250 3.21 Shallow Concentrated Flow, 0.3 55 0.0320 3.63 Shallow Concentrated Flow, Smooth surfaces n= 0.011 P2= 3.42" Paved Kv= 20.3 fps Paved Kv= 20.3 fps Paved Kv= 20.3 fps 1.8 325 Total, Increased to minimum Tc = 6.0 min Subcatchment 5S: EX-DA 5 Hydrograph 9cfs I': : -ram---------r r-r-i 22 : Type III 24-hr 100 yr i Rainfall=8.72" Runoff ii ii ii i i # i i i i Area=20,211 sf Runoff Volume=0.317 af Runoff Depth=8.1,9 Flow Length=325' : Tc=6.0 min CN=80/98 0- 01 2 34 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 Prepared by TRC Engineers, Inc. Type III 24-hr 100 yr Rainfall=8.72" Printed 3/4/2012 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 50 Summary for Subcatchment 6S: EX-DA 6 Runoff = 18.00 cfs@ 12.22 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 1.832 af, Depth= 6.57" Pervious/lmperv., 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 (min) Length (feet) Velocity (ft/sec) 13.2 150 Slope (ft/ft) 0.0500 0.1 30 0.0880 4.45 0.2 40 0.3130 2.80 * * * * 0.19 Capacity (cfs) Time Span= 0.00-30.00 Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, 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 Unpaved Kv= 16.1 fps 16.9 490 Total hrs, dt= 0.01 hrs

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 100 yr Rainfall=8.72" Printed 3/4/2012 Page 51 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Subcatchment 6S: EX-DA 6 Hydrograph —:---------- L 18.00 cfs 19": 18-: 17r r 16-: 15-; 13-; 12- J ------ 1 ----f - - - l - l - __ ! .L_. _-L_- 4 11- L - 1. _ - 10- . - i. . . .I £ 91 rrType III 244ir!100 yr ! I : ; i Rainfa11=8.72" Runoff Area=145,697 sf Ru noff Volume=1,832; af Runoff Depth-6.57" i Flow Length=490' B-: :! iz lzimmitm r ;CN=80/98 42 rrrrrr hi MMimii rrrrrr i"n 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Mill II II II

Pre-Development West Orange with ponds 2 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 3/4/2012 Page 52 Summary for Subcatchment 7S: EX-DA 7 Runoff = 16.51 cfs@ 12.11 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 1.275 af, Depth= 6.37" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 Area (sf) CN Description * * * 805 2,198 10,157 86,177 5.402 98 Impervious, HSG D 98 Gravel road, HSG D 85 Yard stone, HSG D 80 >75% Grass cover, Good, HSG D 73 Brush, Good, HSG D 104,739 101,736 3,003 81 Weighted Average 80 97.13% Pervious Area 98 2.87% Impervious Area Tc (min) Length (feet) 4.5 70 0.1600 0.26 0.8 70 0.0857 2.4 310 0.0200 2.12 Description Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, 1.46 Woodland Kv= 5.0 fps Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 7.7 450 Total Subcatchment 7S: EX-DA 7 Hydrograph ---- r 18- -- 16.51 cfs 17- 1 / 15 / 1312 L.i »=, i 9u. 8 4- -- t —i----1--r- - »-- 1--i— - -i---i— 1--- 1 - ’:’:Type III 24-hr 100;yr -M Rainfall=8.72,> Runoff Area=104^739 sf RunpffV°lume=i:275! af - -j - Runoff Depth=0.37'' i i t Flow Length=450r 4 -..; -;Tci7.7 rrtirt ! CN=80/98 - L - J - -I----------------------------------------- 1------I------4 - -1 - ___1------X - L_ 0 1 2 3 4 5 6 7 8 nrr| 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 ■ Runoff k hrs

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Type III 24-hr 100 yr Rainfall=8.72" Printed 3/4/2012 Page 53 Summary for Subcatchment 8S: EX-DA 8 Runoff = 5.04 cfs @ 12.37 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 0.665 af, Depth= 7.44" Split Pervious/lmperv., Time Span= 0.00-30.00 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 28.4 385 Total 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 Shallow Concentrated Flow, Paved Kv= 20.3 fps Subcatchment 8S: EX-DA 8 Hydrograph L I 5.04 Cfs I « 3 i 01 2 34 56 78 r - r i r r : Type ill 24-hr 100 yr : : Rainfall=8.72" Runoff Area=46,708 sf RunoffVolume=0.665 af I Runoff Depth=7.44" Flow Length=385‘ n : \ ; Tc=28.4min CN=85/98 “f'j i i 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 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 54 Summary for Subcatchment 9A: EX-DA 9A Runoff 2.20 cfs@ 12.42 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 0.294 af, Depth= 7.01" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description 1,344 98 85 21,924 20,580 1,344 86 Weighted Average 85 93.87% Pervious Area 98 6.13% Impervious Area Length (feet) Tc (min) 31.4 Paved road, HSG D Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 120 0.0040 Sheet Flow, Yard stone 0.06 n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph 2.20 Cfs Type l|l 24-hr lOOlyr i Rainfall=8.72" % E i i i il i 1i wk 1 i i i 0 1 2 34 5 6 l i i i i i i i i i i i i i i i i lunoff Area=21,924 sf i off; Volume=0.;294; af ftunoff bepthFtdr;' | Flow Length=120' j Slope=0.0040 T i t i i i i i i :=3l4;min 1 iii i i i i i i i «,i i i ;CN=85/98 i i i i i i i i i i i ! ' TfrrTTpTrTfmift fiifnii|1 u ifnu |‘n n fi n ifnn p ht|*h rifrinfn 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 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 3/4/2012 Page 55 Summary for Subcatchment 9B: EX-DA 9B Runoff = 4.85 cfs@ 12.40 hrs, Vo!ume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 0.678 af, Depth= 7.76" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 -r ~ i hrs Area (sf) CN Description * * * 24,703 670 20,336 98 Impervious, HSG D 91 Gravel, HSG D 85 Yard stone, HSG D 45,709 21,006 24,703 92 Weighted Average 85 45.96% Pervious Area 98 54.04% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 30.0 150 0.0070 0.08 Sheet Flow, Yard Stone 1.0 160 0.0190 2.80 Shallow Concentrated Flow, 31.0 310 Total Description (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Subcatchment 9B: EX-DA 9B Hydrograph t i l 4.85 cfs 5- i—:—i---1—i--i—r l - ■ ■ -r i -H—r-h-—i—— —•— •— -ri & 3- i a 1 - 1 i 1 i i 1 i 1 1 ” i 1 1 1 1 - i ” i i i 1 i * 1 i i i Rainfall=8.72" Runoff Area=45,709 sf Runoff; Volume=0.678 af Runoff Depth=7.76" Flow Length=310' Tc=31;0 min CN=85/98 L _ 1_ J 8 i 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) WMWr — i — r - r

Pre-Development West Orange with ponds 2 Type III 24-hr 100 yr Rainfall=8.72" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 56 Summary for Reach 10R: CB-3 to CB-1 [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = Inflow = Outflow = 1.072 ac, 34.07% Impervious, Inflow Depth = 7.44" for 100 yr event 5.04 cfs @ 12.37 hrs, Volume= 0.665 af 5.04 cfs @ 12.38 hrs, Volume= 0.665 af, Atten= 0%, Lag= 0.4 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 8.49 fps, Min. Travel Time= 0.3 min Avg. Velocity = 3.25 fps, Avg. Travel Time= 0.7 min Peak Storage3 83 cf @ 12.38 hrs Average Depth at Peak Storage= 0.71' Bank-Full Depth= 1.00’, Capacity at Bank-Full= 5.95 cfs 12.0" Round Pipe n= 0.025 Corrugated metal Length= 140.0' Slope= 0.1030 7 Inlet lnvert= 592.92’, Outlet Invert3 578.50' Reach 10R: CB-3 to CB-1 Hydrograph i—i—:—i—i----- :--- 1-- :--- ; i■i■iii I Inflow I I Outflow! OA.nfsj 04 Cfs Inflbw Area=1.072 ac A vg»■ Flow peRth=p.71: Max Vel=8.49 fps 12.0 i 1 T I L.1-- 00 Round Pipe I n=0.025 : ■ ■ ■■ L-140.0* iiiiiiiii i i S=0.1030 T Capacity=5.95 cfs iii 3- 1 2 34 7 __•-- L 5 6 78 _ J_____ ---L m 1111111 |i 1111* 1111* ii i|i 111 |i m i p 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Time (hours)