2026 02 12 Crestmont CC and Eagle Rock Ave Stormwater Management Report

sms: (M3N) YA-OL LOGPN LOLOLSN ‘21 JoelO4e) “JeOuY) ZUOH ase SJO|U! quNd IN “SUA-O} = polled WNJSY ‘SION 6 010 | oo | ozo | ooo | ozo | e100] ozo'0 | ozo'o | oo'z | Bes | oo% | coz |} oze | oe | oy | 000 | 291 | OOO | Z9F | UONEUIqWOD zo 09 oo | oor | evo] oor | sz'0 | e100] ozo} ozo} on'z | Ges | oz | coz} zz | ave | oF | co | sez | oo'0 | sez | uoneuquog | el-Lao 19 . . . . . . . . . . . . . . . . . . . . ajoyuen e-+HN 09 0 oo | coz | ovo] ooz | ozo | e100] ozo} oso} on'z | Ges | soo | coz | oor | ove | oF | oo | ort | to | set | uoneuquog | ¢-LE0-Ka 6s 0 oo | vez | tzo]| 92 | Iz':0 | et0'0] ozo} oso'0| oo'z | Bes | 914 | coz} ov] - - | 000 | ost | oo'0 | ost e129 1-190 8g 0 oo | +96 | ceo] vse | ce | et00] 100] Loo} oz | Ges | zez | coz | oor | ove | oF | oo | sev | zo0 | zap | uoneUquog | z-180-Ka us 0 010 | voz | z9'0 | vo'ez | z9°0 | e100] oz0'0| oso'0| o0'z | Ses | oo'% | cov | cov} - - | 000 | 922 | o0'0 | oz are 2-199 9g 0 oo | zys | zvo] zys | zt0 | et00] ozo} oso'0} coz | Ses | oo | coy | ooh] - - | 00 | 90 | 000 | 90 eye 8-180-xa sg 8g oo | ze | 400] zs | z0°0 | e100] W200} zoo} oo Joloo] = - 00% | cor | ove | ov | 10.0 | st0 | €0'0 | 910 | UoneUquog | Z-180-K3 +g 0 oo | see | zoo] see | 200 | e100] ozo} ozo} oot | e000] = - ooz | cor | ove | ov | too | v0 | too | ero | uoneuquog | 9-180-Ka eg 0 oo | vo9 | eo] 09 | 810 | e100] ozo} oso'0| oo'z | Bes | zh | coz} cov] - - | 000 | bb | 000 | wre are z-1S00 zs 0 oo | oor | ro] oor | rio | e100] ozo} oso} oo'z | Ges | coo | coz | oor | ove | oF | oo | G0 | 000 | Gro | UoNeUIqWoD | -L80-Ka 1s - - - - ° ° ° ° ° ° > = > > > > > > > > euoN = AXA y180-Xa] OS 6s oo | ese | vo | ese | v0 | 100] Ge00 | Be0'0 | nz | szo0 - 00% | oor | ove | ov | LO | 62:0 | C00 | O60 | YoNeUIquoD 22-189 6y 0) 00 toe | 020 | LOZ | 020 | €L0:0] 0z00} oso'0| oo | BeS | Sto | 0OZ | oO | - - | 000 | o€'0 | o0'0 | o¢0 e129, Fda t-10) ey le oo | ese | soo} ese | S00 | e100] st00} st0'°0| ooz | oz00 - 00% | oor | ove | ov | 200 | HL0 | 90°0 | O10 | UoNeUIquog b-Lgo Ly ve oo | Lev | 900] Ley | 900 | 100] sto;0} st0'0| oo | 0200 - 00% | OOF | OLE | OF | HOO | 20 | B00 | BtO | YoNeUIquoD ol-go ov wy 00 | cov | oro | oov | O10 | E100] 9200} 920°0 | on | oL0'0 - 00% | oor | ove | ov | vO | seo | oO | GeO | UoNeUIquog 22-189 sy (uy) @) (y) Gy) (y) (Guns) | Gans) | Gx) | Gary) | Gabs) | Gy) | Gy) | Gs) | (un | (si9) | (s¥9) | (S49) |

9200} 920°0 | on | oL0'0 - 00% | oor | ove | ov | vO | seo | oO | GeO | UoNeUIquog 22-189 sy (uy) @) (y) Gy) (y) (Guns) | Gans) | Gx) | Gary) | Gabs) | Gy) | Gy) | Gs) | (un | (si9) | (s¥9) | (S49) | (S39) ON | sdeq | peesds | wideq| peaids |yideq} u xs | ws | m | os | cov | mM q q 3H | df | adeg | Aueg | y}e9 edkL PI aka 3e1ul 4eynnD aye1Q qung Le) yelul $202-22-0L OvVOO'E A 920 OIPMS JaFEMUIOIS pyodey j9|U| LOLOLSN ‘aweN yafo1g

= = EXISTING CONDITIONS WEIGHTED RUNOFF COEFFICIENT CALCULATIONS

Crestmont Country Club Eagle Rock Ave Improvements Langan Project #10104802 Township of West Orange, NJ DRAINAGE SUBAREA RUNOFF COEFFICIENT CALCULATIONS EXISTING CONDITIONS STORMWATER CONVEYANCE CRESTMONT COUNTRY CLUB & EAGLE ROCK AVE IMPROVEMENTS LANGAN PROJECT #10104802 PROPOSED CONVEYANCE SYSTEM SUB- OPEN SPACE OPEN SPACE WOODS WOODS GRAVEL IMPERVIOUS TOTAL TOTAL RUNOFF DRAINAGE HSGC C HSGC D HSGC C HSGC D HSGC C AREA AREA AREA COEFFICIENT STRUCTURE AREA C = 0.51 C = 0.65 C = 0.45 C = 0.59 C = 0.84 C = 0.99 C TYPE (SF) (SF) (SF) (SF) (SF) (SF) (SF) (AC) (Weighted) NETWORK 1 EX-CB1-2 46,220 16,005 2,062 2,630 0 21,788 88,705 2.04 0.65 GRATE INLET EX-CB1-3 0 0 0 0 17,450 17,450 0.40 0.99 GRATE INLET NOTES: 1. Runoff coefficients are referenced from Table 10.3-B: Recommended Coefficient of Runoff Values for Various Selected Land Uses from Section 10 of the 2015 New Jersey

GRATE INLET NOTES: 1. Runoff coefficients are referenced from Table 10.3-B: Recommended Coefficient of Runoff Values for Various Selected Land Uses from Section 10 of the 2015 New Jersey Department of Transportation (NJDOT) Roadway Design Manual. \\langan.com\data\PAR\data8\101049801\Project Data\_Discipline\Site Civil\Stormwater\Eagle Rock Inlet Runoff Coefficient Calculations

= = EXISTING CONDITIONS INLET SPREAD CALCULATIONS

Existing Conditions Inlet Gutter Spread of Flow Calculations PROJECT NAME: CRESTMONT COUNTRY CLUB & EAGLE ROCK AVE LANGAN PROJECT #: 101049802 DATE: 8/25/2025 Variables Equations Sx1 = Roadway Cross-Slope (ft/ft) T = Flow Width Sx = (Sx1*Sx2)/(Sx1+Sx2) Sx2 = Proposed Access Slope (ft/ft) Ku = constant 0.56 T = [(Q*N)/(Ku*Sx^(1.67)*Sl^(0.5)]^0.375 Sl = Longitudinal Slope (ft/ft) Q = Flow (cfs) Encroachment = T*(Sx2/(Sx1*Sx2)) N = Roughness Coefficient I= Rainfall intensity of 10-year storm of 10 minute duration(in/hr) Drainage Area Equivalent Q Shoulder Travel Lane Max. C I Q Total Q N Sx1 Sx2 Sl Sx T Acceptable? Area (acres) Area Bypass Width Width Encroachment EX-CB1-2 2.04 0.65 1.332 5.04 6.71 0.00 6.71 0.013 0.041 1.000 0.020 0.039 7.86 0.0 12.0 4.00 NO EX-CB1-3 0.40 0.99 0.397 5.04 2.00 0.00 2.00 0.013 0.034 1.000 0.025 0.033 5.36 0.0 12.0 4.00 NO Notes: 1. Per Table 10.5-C in the NJDOT Roadway Design Manual, the maximum encroachment of water on the roadway pavement for a land service road shall not exceed one-third (1/3) of the width of a through traffic lane during a 10-year storm of 10 minute duration. 2. Sx2 for the gutter spread calculations is valued at 1 to reflect curbed sections. 3. Q ByPass represents the bypass flow from the nearest upstream structure(s) during the 10-year storm. Refer to Stormwater Studio report for bypass flow calculations.

= = PROPOSED CONDITIONS INLET SPREAD CALCULATIONS

Proposed Conditions Inlet Gutter Spread of Flow Calculations PROJECT NAME: CRESTMONT COUNTRY CLUB & EAGLE ROCK AVE LANGAN PROJECT #: 101049802 DATE: 10/23/2025 Variables Equations Sx1 = Roadway Cross-Slope (ft/ft) T = Flow Width Sx = (Sx1*Sx2)/(Sx1+Sx2) Sx2 = Proposed Access Slope (ft/ft) Ku = constant 0.56 T = [(Q*N)/(Ku*Sx^(1.67)*Sl^(0.5)]^0.375 Sl = Longitudinal Slope (ft/ft) Q = Flow (cfs) Encroachment = T*(Sx2/(Sx1*Sx2)) N = Roughness Coefficient I= Rainfall intensity of 10-year storm of 10 minute duration(in/hr) Drainage Area Equivalent Q Shoulder Travel Lane Max. C I Q Total Q N Sx1 Sx2 Sl Sx T Acceptable? Area (acres) Area Bypass Width Width Encroachment EX-CB1-1 0.06 0.83 0.047 5.04 0.24 0.06 0.30 0.013 0.025 1.000 0.028 0.024 3.10 0.0 12.0 4.00 YES EX-CB1-2 1.37 0.70 0.953 5.04 4.80 0.02 4.82 0.013 0.041 1.000 0.020 0.039 6.94 0.0 12.0 4.00 NO4 EX-CB1-3 0.27 0.99 0.269 5.04 1.35 0.11 1.46 0.013 0.034 1.000 0.025 0.033 4.77 0.0 12.0 4.00 NO4 EX-CB1-4 0.04 0.99 0.038 5.04 0.19 0.00 0.19 0.013 0.023 1.000 0.012 0.022 3.25 0.0 11.0 3.67 YES EX-CB1-5 0.24 0.60 0.142 5.04 0.72 0.01 0.72 0.013 0.037 1.000 0.030

0.022 3.25 0.0 11.0 3.67 YES EX-CB1-5 0.24 0.60 0.142 5.04 0.72 0.01 0.72 0.013 0.037 1.000 0.030 0.036 3.33 0.0 10.0 3.33 YES EX-CB1-6 0.051 0.50 0.026 5.04 0.13 0.01 0.14 0.013 0.020 1.000 0.009 0.020 3.26 0.0 10.3 3.43 YES EX-CB1-7 0.041 0.77 0.032 5.04 0.16 0.03 0.19 0.013 0.021 1.000 0.010 0.021 3.47 0.0 10.4 3.47 YES CB1-6 0.08 0.86 0.066 5.04 0.33 0.07 0.40 0.013 0.020 1.000 0.027 0.020 4.00 0.0 12.0 4.00 YES CB1-8 0.064 0.82 0.052 5.04 0.26 0.04 0.30 0.013 0.020 1.000 0.015 0.020 3.98 0.0 12.0 4.00 YES CB1-9 0.045 0.91 0.041 5.04 0.21 0.10 0.31 0.013 0.021 1.000 0.013 0.021 3.99 0.0 12.0 4.00 YES CB1-21 0.067 0.78 0.052 5.04 0.26 0.03 0.29 0.013 0.021 1.000 0.015 0.021 3.80 0.0 11.5 3.83 YES CB1-22 0.18 0.99 0.179 5.04 0.90 0.00 0.90 0.013 0.039 1.000 0.025 0.038 3.66 0.0 11.0 3.67 YES CB1-23 0.10 0.88 0.091 5.04 0.46 0.00 0.46 0.013 0.025 1.000 0.018 0.024 3.95 0.0 12.0 4.00 YES CB1-24 0.06 0.86 0.051 5.04 0.26 0.06 0.32 0.013 0.020 1.000 0.017 0.020 3.99 0.0 12.0 4.00 YES CB1-25 0.07 0.86 0.059 5.04 0.30 0.04 0.34 0.013 0.020 1.000 0.020 0.020 3.97 0.0 12.0 4.00 YES CB1-26 0.09 0.86 0.074 5.04 0.38 0.05 0.43 0.013 0.021 1.000 0.027 0.021 3.97