J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 10yr Rainfall=5.21" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 27 Summary for Subcatchment 4S: EX-DA 4 Runoff = 6.37 cfs @ 12.19 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.628 af, Depth= 4.16" Pervious/lmperv., Time Span= 0.00-30.00 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) Slope Velocity Capacity (ft/ft) (ft/sec) 12.3 150 0.0600 0.20 0.7 135 0.0460 3.22 1.2 310 0.0470 4.40 14.2 595 Total Description (cfs) Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Subcatchment 4S: EX-DA 4 Hydrograph -—i—. r ,----------- r—;—i------- 1—r7- 6.37cfs 6,__ I_*_1 _ J__ ___t ___J ____ I __ I __ L _ J £ 4.1 ___ |___ i - 01 2 34 — i— i- -I — t— u _ J 56 78 ------ ii ii Type III 24-hr 10 yr Rainfall=5.21" _ l L „ J • _ - I 4 - J ' I I l _ _ I 1 _ Runoff Area=78,947 sf Runoff Volume=0.628 af Runoff Depth=4.16" f Flow Length=595' i ii ii i w i i it Tc=14.2 min CN= 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 10 yr Rainfall=5.21" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 28 Summary for Subcatchment 5S: EX-DA 5 Runoff = 2.27 cfs @ 12.08 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.183 af, Depth= 4.72" 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) 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, Capacity (cfs) Description 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---L 2.27 cfs ■----- r -i— *- Type II) 24-hr 10 yr : Rainfall=5.21" ii Runoff ArUa-20,211 sf Ruhoff:yolume=0.i83 af : ; Runoff bepth=4.72" Li J.Flow Length-325' iiiii•ii ii.i - -+ —i — i— >— -* - -» ——i - —i— ~ Tc=6l0 min CN=80/98 TV 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 10 yr Rainfall=5.21" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 29 Summary for Subcatchment 6S: EX-DA 6 Runoff = 9.18 cfs @ 12.23 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.923 af, Depth= 3.31" Pervious/lmperv., Time Span= 0.00-30.00 Area (sf) CN Description * * * * 9,501 8,481 43,082 57,041 27.592 98 Paved road, HSG D 98 Gravel road, HSG D 85 Yard stone, HSG D 80 Grass cover, Good, HSG D 73 Brush. Good, HSG D 145,697 127,715 17,982 82 Weighted Average 80 87.66% Pervious Area 98 12.34% Impervious Area Tc (min) Length (feet) Slope Velocity (ft/ft) (ft/sec) 13.2 150 0.0500 0.19 0.1 30 0.0880 4.45 0.2 40 0.3130 2.80 Capacity (cfs) 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 byTRC Engineers, Inc. Type III 24-hr 10 yr Rainfall=5.21" Printed 3/4/2012 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 30 Subcatchment 6S: EX-DA 6 Hydrograph i ;------- i i p "i—i—i—r ■ T- 10 ■ r " •» —i— i— r - ~\ ~ -i- i— i —t'—i— r _1_ _ _ u - i- - __ -i_ 8- Ru 7- m i „ 6- J» o i i ii ii 9.18 cfs 9 i ° LL 1—i—i—r Ru 5 4- 3- :Type III 24*hr I0;yr i : : Rairifall=^.2lf noff Area=145,697 sf noff; Volume=0J923 af Runoff Depth=3.317 : Flow Length-490' : : Tc=16.9 mih CN=80/98 2- ’ f 1 0 1 ii i'll ii h i |‘ii ii 1 m i'll M I'm i i [11 iil'iri i |‘n 0 1 2 3 4 5 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) ■ r “ r - -i - -i- - r ” i " • i i i KZctzz a

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 10 yr Rainfall=5.21" Printed 3/4/2012 Page 31 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: EX-DA 7 Runoff = 8.27 cfs @ 12.11 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.627 af, Depth= 3.13" 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 7.7 450 Total Slope Velocity Capacity (ft/ft) (ft/sec) Description (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 Subcatchment 7S: EX-DA 7 Hydrograph i—i—i—i—i—i—r A | ■ Runoff| 9- 8.27 cfs III■Iv 87- ---L _ J---I---•_ 6- I u. 4- 3- 21 _I . . Type III 24-hr 10 yr - : r Rainfall=5.21" Runoff Area=104,739 sf Runoff; Volumo=0.627 af Runoff Depth=3.13" : i Flow Length=450' Tc=7i7 min CN=80/98 i - J-----------1------I------ 1 o-H 0 1 2 3 4 5 6 7 8 9 tTTnrrrT, r™T 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 Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Type III 24-hr 10 yr Rainfall=5.21" Printed 3/4/2012 Page 32 Summary for Subcatchment 8S: EX-DA 8 Runoff = 2.79 cfs @ 12.38 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21” UH=SCS, 0.361 af, Depth= 4.04" Split 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, 28.4 385 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 Subcatchment 8S: EX-DA 8 Hydrograph - J. - -J t—i—i—r ---- 1 -- L J--- 1------ 1 ------I ----------I -------1 ------I ____ L _ J ________ I ____L i i . J ------------------- l _ _ L _ J ______ 1 ___ I ____ L _ J _______ __I__ L _ :_l 2.79 T ~ 7 • ---- I cfs rrn R -*1- 01 - - k- Type III 54thr 10;yr j i Rainfall=5.21';' Ruhdff| Araa-46,708; sf unoff;Volume=0.;361;af Runoff depth=4.Q4l' Flow Length=385' Tc=28.4n1irt ! CN=85/98 frrrri p u iiini p'n ipi »i p i i n*n i i................... n ■ ■ i n ■ ■ ................................... ................... 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) *5

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 10 yr Rainfall=5.21" Printed 3/4/2012 Page 33 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9A: EX-DA 9A Runoff = 1.17 cfs@ 12.42 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.153 af, Depth= 3.65" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * Tc (min) 31.4 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) 120 0.0040 0.06 Sheet Flow, Yard stone n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph 1.17 cfs r "T 78 Type III 24-hr 10 yr r : r Rainfall=5.21” Runoff Area=21,924 sf Runoff Volume=0.153 af Runoff Depth=3.65^' Flow Length-120’ Slope=0.0040 V I Tc=31.4 min CN-85/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs

Pre-Development West Orange with ponds 2 Type III 24-hr 10 yr Rainfall=5.21" Prepared byTRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 34 Summary for Subcatchment 9B: EX-DA 9B Runoff = 2.74 cfs @ 12.43 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.378 af, Depth= 4.32" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= “i—r * r “ r 0.01 Area (sf) CN Description h 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 I T l r i n Hydrograph IlIlI r_r-i--|--r 2.74 __• i. _J___ cfs Typeilll 24-*hr 10;yr i Rainfall-5.21 :Runoff Area=45r709 sf Rtunoff Volume=0.378 af : ftunoff bepth=4.32':' Flow Length=3i0' Te|=31>o|niih i ;CN=85/98 ................ .. ....... .. ............... "'i'" " i*" ............... ................p ii i’ ” '!■' 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 Prepared by TRC Engineers, Inc. Type III 24-hr 10 yr Rainfall=5.21" Printed 3/4/2012 Page 35 HvdroCAD® 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 = 4.04" for 10 yr event 2.79 cfs @ 12.38 hrs, Volume3 0.361 af 2.79 cfs @ 12.38 hrs, Volume3 0.361 af, Atten=0%, Lag=0.1min Routing by Dyn-Stor-Ind method, Time Span3 0.00-30.00 hrs, dt3 0.01 hrs / 2 Max. Velocity3 7.45 fps, Min. Travel Time3 0.3 min Avg. Velocity 3 2.71 fps, Avg. Travel Time3 0.9 min Peak Storage3 52 cf @ 12.38 hrs Average Depth at Peak Storage3 0.48' 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'/* Inlet Invert3 592.92', Outlet Invert3 578.50' Reach 10R: CB-3 to CB-1 Hydrograph — I Inflow I i Outflow! 2.79 cfs A Inflow Area=1.072 ac vg. Flow Depth=0.48< Max Vel=7.45 fps 1:2-0V : Round Pipe | i i n=0.025 ..LLi-L; J.^140.0? j i i S=0.1030T : Capacity=5.95 cfs 0- 1 2 3 4 5 6 rfl* 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)

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 10 yr Rainfall=5.21" Printed 3/4/2012 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 36 Summary for Reach 11R: Surface Swale [55] Hint: Peak inflow is 102% of Manning's capacity Inflow Area = Inflow = Outflow = 1.049 ac, 54.04% Impervious, Inflow Depth = 15.29" for 10 yr event 24.29 cfs @ 12.13 hrs, Volume= 1.337 af 24.21 cfs @ 12.14 hrs, Volume= 1.337 af, Atten= 0%, Lag= 0.7 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 4.78 fps, Min. Travel Time3 0.9 min Avg. Velocity = 0.87 fps, Avg. Travel Time= 4.8 min Peak Storage= 1,267 cf @12.14 hrs Average Depth at Peak Storage3 0.50' Bank-Full Depth3 0.50', Capacity at Bank-Full3 23.76 cfs 5.00' x 0.50' deep channel, n= 0.030 Short grass Side Slope Z-value= 10.0 '/' Top Width3 15.00' Length3 250.0' Slope3 0.0400 7 Inlet Invert3 590.00', Outlet Invert3 580.00’ Reach 11R: Surface Swale Hydrograph j_••__ i_i__ I 24 cfs 24.21 cfs J. _ J _ _ 1. - J--------- 26 _ _ L J ___ 1 __ * I __J . _ J ____ I __ I __ I __ L _ J ____• ----• _ _ yjv^fea=:1;.Q49 ap 24 22 Avg r i _ j_< _ _ L _L - 20 j__> 4. - 4 - - is-; ■ r-1 - 16 J£ ~ 14* 5 E 12-j 10-i 8 L — J — Flow: bepth=b.i>0' Max ;Vel=4.78 fps n“0:03d -r~r-t L=250;0' __ ___ L _ J _ S=0.0400T iiiiiii apacity=23.76 cfs r - ri, ■ 6 4-3 2 _ r m 0^ 0 1 2 3 4 5 6 7 8 I Inflow | I Outflow! _i____i____j. _ j _ j_________i- - i— i. _ j —i —i— i— j. _ j —i _ _i— 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) r - r - 7 ~ i'