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 CHANNEL OR CHANNEL SECTION Swale 2 Swale 2 TEMPORARY OR PERMANENT (T OR P) P P DESIGN STORM (YR) 10 25 DRAINAGE AREA (AC) 0.17 0.17 Qr (REQUIRED CAPACITY) (CFS) 0.51 0.57 Q (CALCULATED AT FLOW DEPTH d) (CFS) 0.57 0.63 PROTECTIVE LINING Eronet P300 Eronet P300 n (MANNING'S COEFFICIENT) 0.030 0.030 Va (ALLOWABLE VELOCITY) (FPS) 7.00 7.00 V (CALCULATED AT FLOW DEPTH d) (FPS) 1.33 1.37 2 τa (MAX ALLOWABLE SHEAR STRESS) (LB/FT ) 8.00 8.00 2 τd (CALC'DSHEAR STRESS AT FLOW DEPTH d) (LB/FT ) 0.11 0.11 CHANNEL BOTTOM WIDTH (FT) 2.00 2.00 CHANNEL SIDE SLOPES (H:V) 3.00 3.00 D (TOTAL DEPTH) (FT) 1.50 1.50 CHANNEL TOP WIDTH @ D (FT) 11.00 11.00 d (CALCULATED FLOW DEPTH) (FT) 0.17 0.18 CHANNEL TOP WIDTH @ d (FT) 3.02 3.08 d50 STONE SIZE (IN) - - A (CROSS-SECTIONAL AREA) (SQ. FT.) 0.43 0.46 R (HYDRAULIC RADIUS) 0.14 0.15 S (BED SLOPE)

ONAL AREA) (SQ. FT.) 0.43 0.46 R (HYDRAULIC RADIUS) 0.14 0.15 S (BED SLOPE) (FT/FT) 0.0100 0.0100 MINIMUM REQUIRED FREEBOARD (FT) 1.00 0.30 DESIGN METHOD FOR PROTECTIVE LINING PERMISSIBLE V V VELOCITY (V) OR SHEAR STRESS (S)