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

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.