Stormwater Report

512-516 Pleasant Valley Way, West Orange 1240815-pipes Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 52 Summary for Subcatchment 6: Bypass Runoff = 0.00 cfs@ 1.25 hrs, Volume= 0.000 af, Depth= 0.07" Routed to Link 7 : Proposed Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Ul as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Area (sf) CN Description 60574 ~—~>75% Grass cover, Good, HSG C 605 74 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) _(fUft)__(f/sec) (cfs) 5.9 100 0.0650 0.28 Sheet Flow, 1 Grass: Short n= 0.150 P2= 3.47" 0.1 28 0.0900 4.50 Shallow Concentrated Flow, 2 Grassed Waterway Kv= 15.0 fps 6.0 128 Total Subcatchment 6: Bypass Hydrograph 0.0024 Water Quality Storm 0.0024 Water Quality Rainfall=1.25" P2=3.47" Runoff Area=605 sf Runoff Volume=0.000 af Runoff Depth=0.07" Flow Length=128' Tc=6.0 min CN=74/0 Flow (cfs) 0 2 4 6 B 10 12 14 16 16 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 7072 Time (hours) 59

512-516 Pleasant Valley Way, West Orange 1240815-pipes Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 53 Summary for Link 7: Proposed Inflow Area = 0.374 ac, 69.93% Impervious, Inflow Depth= 0.16" for Water Quality event Inflow = 0.23 cfs@ 1.14 hrs, Volume= 0.005 af Primary = 0.23 cfs@ 1.14 hrs, Volume= 0.005 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Link 7: Proposed Hydrograph Bi Inflow Primary. Inflow Area=0.374 ac 0 2 4 6 8 10 1214 16 18 20 22 24 26 28 30 32 34 96 38 40 42 44 46 48 50 52 54 56 58 6062 64 66 68 70 72 Time (hours) 60

| DRAINAGE AREA MAPS 61

nt p \ Dat PA een? 0.168 AC SF = Cn=95 9 — + iN pane ahi we F 92 LF a ph SHEET FLOW Sb A 92L @EgSHERT FLO} PLEASANT = VALLEY WAY 575.40" San. Maintole~ — 421.70 Rim 414.87 IE 8" Clay 414.70 IE 8 Clay ‘Project No.: Cale.By: Page: DASEY & KELLER, INC. \512-516 PLEASANT VALLEY WAY, WEST ORANGE| ¢20815 = | = ‘58 MAIN STREET, MILLBURN, NJ 07041 Scale Fie Name: CTheckBy Date 973) 379-3280 Fax: (973) 379-7993 PROPOSED DRAINAGE AREA 4" 20° DA-EXISTING JAA, 9/11/25

olf Chain-Link = jy 77 4 Fence yi Link Fence ce a 2.87 over E i | yr 04 overE [Pyeaay x = . ‘ / r x — ~ 4 t & ig PON Bm | H ann en su CONCENTR: ed H ‘s SHPATELOW iste SHALLOW — ~4ee-._ BL _— i \ | J) CONCENTRATIED FLOW. + q 1 ” 7 ; | 7 rt ‘ence , 7 ~ 4 t5- B Mag we 7 7) oO woe 46--- NY ‘ ff Ae > _ \ 18 = 417,26 H § Oren ‘eet Pai E9349 we ‘shy Sp CLF TA |" ~~ Tl fk sce PS 5 HS, e ie 7. oo Curb Hi oO, ‘ever S ~s. im a *8 \ 66 LF { Story manag. \ SHEET FLOW Frame | . oy f ‘Dwelling’ a) ' a“ “4 ‘SJ foo™. uilding i Se ~ -4t9---] 7 : 420Q-~ i L704 a S = se rE 43332 a ye ad 1 H IP! Hl fos 1B 4--.2: ; — San, Manhole: 421.70 Rim 414.87 IE 8" Clay 414.70 IE 8 Clay Project No: Cale. By: Page: ASEY & KELLER, INC. [512-616 PLEASANT VALLEY WAY, WEST ORANGE| 240815 JAA 38 MAIN STREET, MILLBURN, NJ 07041 Seale File Ware: Check By: Date 173) 379-3280 Fax: (873) 379-7883 EXISTING DRAINAGE AREA oon t= 20" DA-EXISTING JAA 911125