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

Channel Design Calculations PROJECT NAME: CRESTMONT COUNTRY CLUB & EAGLE ROCK AVE IMPROVEMENTS LOCATION: WEST ORANGE, ESSEX COUNTY, NJ PREPARED BY: TEG DATE: 7/17/2025 CHECKED BY: MJV DATE: 7/17/2025 Swale 1 (Min. Swale 1 (Min. Swale 1 Swale 1 CHANNEL OR CHANNEL SECTION Slope) Slope) (Max. Slope) (Max. Slope) TEMPORARY OR PERMANENT (T OR P) P P P P DESIGN STORM (YR) 10 25 10 25 DRAINAGE AREA (AC) 2.44 2.44 2.44 2.44 Qr (REQUIRED CAPACITY) (CFS) 7.97 9.02 7.97 9.02 Q (CALCULATED AT FLOW DEPTH d) (CFS) 8.06 9.06 8.01 9.16 Eronet PROTECTIVE LINING Eronet P300 Eronet P300 Eronet P300 P300 n (MANNING'S COEFFICIENT) 0.030 0.030 0.030 0.030 Va (ALLOWABLE VELOCITY) (FPS) 7.00 7.00 7.00 7.00 V (CALCULATED AT FLOW DEPTH d) (FPS) 2.87 2.96 3.69 3.83 τa (MAX ALLOWABLE SHEAR STRESS) (LB/FT2) 8.00 8.00 8.00 8.00 2 τd (CALC'DSHEAR STRESS AT FLOW DEPTH d) (LB/FT) 0.43 0.46 0.72 0.77 CHANNEL BOTTOM WIDTH (FT) 2.00 2.00 2.00 2.00 CHANNEL SIDE SLOPES (H:V) 3.00 3.00 3.00 3.00 D (TOTAL DEPTH)

(FT) 2.00 2.00 2.00 2.00 CHANNEL SIDE SLOPES (H:V) 3.00 3.00 3.00 3.00 D (TOTAL DEPTH) (FT) 2.00 2.00 2.00 2.00 CHANNEL TOP WIDTH @ D (FT) 14.00 14.00 14.00 14.00 d (CALCULATED FLOW DEPTH) (FT) 0.69 0.73 0.58 0.62 CHANNEL TOP WIDTH @ d (FT) 6.14 6.38 5.48 5.72 d50 STONE SIZE (IN) - - - - A (CROSS-SECTIONAL AREA) (SQ. FT.) 2.81 3.06 2.17 2.39 R (HYDRAULIC RADIUS) 0.44 0.46 0.38 0.40 S (BED SLOPE) (FT/FT) 0.0100 0.0100 0.0200 0.0200 MINIMUM REQUIRED FREEBOARD (FT) 1.00 0.30 1.00 0.30 DESIGN METHOD FOR PROTECTIVE LINING PERMISSIBLE V V V V VELOCITY (V) OR SHEAR STRESS (S)