J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Printed 3/4/2012 Page 7 HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: EX-DA 5 Runoff = 1.45 cfs@ 12.08 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, 0.115 af, Depth= 2.97" 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 Velocity (ft/ft) (ft/sec) Description 0.8 100 0.0570 2.16 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, Capacity (cfs) Sheet 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 i 1 i i i t i i i l i i i i 1.45 cfs : : : ,::: ■i . i ■ • • i i i t • i i i i . i i i i i t 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 t i i i i Type III 24-hr 2; yr ! Rainfall=3.42" Runoff Area~20,211: sf Runoff Volume=0.;115 af Runoff Depth=2.97" Flow Length=325' c=6.0 min CN=80/98 m 8 i i 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 Prepared by TRC Engineers, Inc. Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 6S: EX-DA 6 Runoff = 4.87 cfs @ 12.23 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" * * A * UH=SCS, Split 0.494 af, Depth= 1.77" 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 (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) 13.2 150 0.0500 0.19 Capacity (cfs) Time Span= 0.00-30.00 Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0:1 30 0.0880 4.45 Shallow Concentrated Flow, 0.2 40 0.3130 2.80 Shallow Concentrated Flow, 0.2 30 0.0330 2.92 Shallow Concentrated Flow, 3.2 240 0.0060 1.25 Shallow Concentrated Flow, Yard Stone Grassed Waterway Kv= 15.0 fps Woodland Kv= 5.0 fps Unpaved Kv= 16.1 fps Unpaved Kv= 16.1 fps 16.9 490 Total hrs, dt= 0.01 hrs

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Printed 3/4/2012 Page 9 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Subcatchment 6S: EX-DA 6 Hydrograph “i—i------- ;—i------- r i - - 1 ------r * 4.87 cfs . 4? . _ u - -4 I 3- ° - .» . - l. - X . J - - L . J - -J - _l_ . L .. Jl , _ U . X .. J______ •___U _ .1_____I . . I____L - . Type III 24-hr 2 yr i.i. Rainfall-3.42" Runoff Ared=145,697| sf Runoff Volumes0.494 af i Runoff DepthH.77" i Flow Length=490' . _ L . J I L - J - _J I L _ J » L. - I L _ 1 Tc'=16,9 min CN=80/98 J |> _ L I t I 1 I _ . I. _ L - J . J. . L . J I_ . I 1 .. 1- ^ 2 3 4 56 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 Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 10 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: EX-DA 7 Runoff = 4.25 cfs @ 12.11 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" * * * UH=SCS, 0.324 af, Depth= 1.62" Split 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) Slope (ft/ft) Velocity (ft/sec) 4.5 70 0.1600 0.26 0.8 70 0.0857 1.46 Capacity (cfs) Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Woodland Kv= 5.0 fps 2.4 310 0.0200 7.7 450 Total Shallow Concentrated Flow, 2.12 Grassed Waterway Kv= 15.0 fps Subcatchment 7S: EX-DA 7 Hydrograph | ■ Runoff \ 4.25 cfs ------- CZT--- Type III 24-hr 2 yr Rainfall-3.42';' Runoff Area=104,739 sf Runoff; Vo|ume=0.324: af Runoff DepthH.82" _ i_i__j___ i__i__a___i _ Flow Length=450' Tc=7.7 mih CN=80/98 / - -I------- I----- _ _ .t i t i I t—i 01 'I'"'P ....................................... .......................... ii ipi i i p i i ifmi p ii rpi n p i i ......................................... .......................... 2 34 56 10 11 12 113 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Printed 3/4/2012 Page 11 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: EX-DA 8 Runoff = 1.65 cfs@ 12.40 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.212 af, Depth= 2.37" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description h * h 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, 385 Total Slope Velocity (ft/ft) (ft/sec) Capacity (cfs) Description n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Unpaved Kv= 16.1 fps Paved Kv= 20.3 fps 28.4 Subcatchment 8S: EX-DA 8 Hydrograph i—:-1—;-. ;------- ----i--------: 1.65 cfs I Type III 24-hr 2|yr i Rainfall=3.42" Runoff Area=46,708 sf Run4ffVol!ura?d0.?12iaf *5 1- i : Runoff Depth=2.37" : Flow Length=385' i ii ii iii “ i i ii ; i Tc=28.4 min : CN=85/98 "7* 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 2 yr Rainfall=3.42" Printed 3/4/2012 Page 12 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9A: EX-DA 9A 0.65 cfs @ 12.45 hrs, Volume3 Runoff = Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.085 af, Depth3 2.02" Pervious/lmperv., Time Span3 0.00-30.00 hrs, Area (sf) CN Description * * Tc (min) 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) 31.4 Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 120 0.0040 0.06 Sheet Flow, Yard stone n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph i _ _i_ _ i_ *i i r 0.7 0.65 Cfs — i. - -----i-jar-— 0.650.6 --L-1 0.55 0.5- - 0.45- . 0.4 * 0.35 0.3 -.L_J - -i __ L _ J______ 0.25 0.2 0.15 —i — iii - * I 1 » 4 I 1 l- ~ 4 I 1 _ 4- I • Type III 24-hr 2iyr Rainfall-3.42” RunoffArea-21,924; sf Runoff :V6lume=0.Q85; af : Runoff Depth=i.02';' Flow Length=120’ Slope-0.0040 T : ; | Tc=31.4 min CN=85/98 0.1 0.05 ‘rrrr^iTTft u i|*ii m |4i n ift u i|*n u p irifl rnfti u ft mft inftm ft n >ft il 1 234 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

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Printed 3/4/2012 Page 13 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9B: EX-DA 9B Runoff = 1.68 cfs@ 12.43 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.229 af, Depth= 2.62" Pervious/lmperv., Time Span= 0.00-30.00 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, Description (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps 31.0 310 Total Subcatchment 9B: EX-DA 9B Hydrograph 68 cfs Type III 24-hr 2 yr i Rainfallf3.42V Runoff Area=45,709 sf Runoff; Volume=0.229 af : Runoff Depfh=2.6i2* i Flow Length=310’ | i Tc=3i;o min CN=85/98 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) ' M u p dt= 0.01 hrs

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 14 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC 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 = 2.37" for 2 yr event 1.65 cfs@ 12.40 hrs, Volume= 0.212 af 1.65 cfs @ 12.40 hrs, Volume= 0.212 af, Atten= 0%, Lag3 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 6.47 fps, Min. Travel Time= 0.4 min Avg. Velocity = 2.33 fps, Avg. Travel Time= 1.0 min Peak Storage3 36 cf @ 12.40 hrs Average Depth at Peak Storage3 0.36’ Bank-Full Depth3 1.00', Capacity at Bank-Full3 5.95 cfs 12.0" Round Pipe n= 0.025 Corrugated metal Length3 140.0' Slope3 0.1030 V Inlet Invert3 592.92', Outlet Invert3 578.50' Reach 10R: CB-3 to CB-1 Hydrograph I Inflow I ' I 1 Mr 1.65 Cfs i outflow! Inflow Area=1.072 ac Avg . Flow Depth=0.36’ iMax Vel=6.47 fps i ; i ! 1:2:0’' Round Pipe • n-0.025 ; L=140.0' S=0.1030 7' Capacity=5.95 cfs 1 i|^ ii ifS i i i|^ 1 1 1|1 ni|i i m |V i m 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Printed 3/4/2012 Page 15 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Reach 11R: Surface Swale Inflow Area = Inflow = Outflow = 1.049 ac, 54.04% Impervious, Inflow Depth = 7.06" for 2 yr event 12.19 cfs @ 12.13 hrs, Volume= 0.617 af 12.12 cfs @ 12.14 hrs, Volume= 0.617 af, Atten= 1%, Lag= 0.8 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 3.95 fps, Min. Travel Time= 1.1 min Avg. Velocity = 0.71 fps, Avg. Travel Time= 5.9 min PeakStorage= 767 cf @ 12.14 hrs Average Depth at Peak Storage= 0.36' Bank-Full Depth= 0.50', Capacity at Bank-Full= 23.76 cfs 5.00' x 0.50' deep channel, n= 0.030 Short grass Side Slope Z-value= 10.0 V Top Width= 15.00' Length= 250.0' Slope= 0.0400 T Inlet lnvert= 590.00', Outlet lnvert= 580.00' Reach 11R: Surface Swale Hydrograph . I . .J _ ._• -- 12 I- .iJ_J - 12 ia c f s 12 12 cfs ------ - -I----- 1- . L . 1__ I__ - - L . l - J . J - . l - . I - t . J =1.049 w Avg. Flow Depth=0.36' . j _ •. _ 10- Max Vel=3.95: fps n=0.030 L=250;0' S=0:0400 T Capacity=23.76 cfs ^8 7- r~ri_t — T —k 112 34 5 6 m 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) rr-7 I Inflow I I Outflow I

Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 16 Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Reach 13R: Swale Inflow Area = Inflow = Outflow = 2.404 ac, 2.87% Impervious, Inflow Depth = 1.62" for 2 yr event 4.25 cfs @ 12.11 hrs, Volume= 0.324 af 4.07 cfs @ 12.14 hrs, Volumes 0.324 af, Atten= 4%, Lag=1.6min * • • * • . .• * ■ " i ' t* / | Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 2.94 fps, Min. Travel Time= 2.4 min Avg. Velocity = 0.70 fps, Avg. Travel Time= 10.0 min Peak Storage= 580 cf @ 12.14 hrs Average Depth at Peak Storage= 0.20' Bank-Full Depth= 0.50', Capacity at Bank-Full= 24.59 cfs 5.00' x 0.50' deep channel, n= 0.030 Short grass Side Slope Z-value= 10.0 7 Top Width= 15.00’ Length= 420.0’ Slopes 0.0429 7 Inlet lnvert= 598.00’, Outlet lnvert= 580.00’ Reach 13R: Swale Hydrograph — — I Inflow I i Outflow! 4.25 cfs Inflow Area=2.404 ac Flow:Depth=0.20* Avg. 4.07 cfs V. Max Vel=2.94 fps : n=0i030 •i*iiiiiii : L=420.0' l _ _ I ____________ L _ 1 _____I “ _ _ i i i J . x _ ____ __ • __ i . . . i __ ______ 3- _ j j j S=0.0429 V Capacity=24.59 cfs 2- 1 0 1 234 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)