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

Project filename: Swale Sizing Calcs.stx Channel Report Studio Express by Hydrology Studio v 1.0.0.20 10-22-2025 Swale 1 25-YR (1%) Channel 3 TRAPEZOIDAL DISCHARGE Bottom Width = 2.00 ft Method = Known Q Side Slope Left, z:1 = 3.00 Known Q = 9.02 cfs Side Slope Right, z:1 = 3.00 Total Depth = 2.00 ft Invert Elevation = 1.00 ft Channel Slope = 1.000 % Manning's n = 0.030 CALCULATION SAMPLE Flow Depth Area Velocity WP n-value Crit Depth HGL EGL Max Shear Top Width (cfs) (ft) (sqft) (ft/s) (ft) (ft) (ft) (ft) (lb/sqft) (ft) 9.02 0.73 3.06 2.95 6.62 0.030 0.63 1.73 1.87 0.46 6.38

Project filename: Swale Sizing Calcs.stx Channel Report Studio Express by Hydrology Studio v 1.0.0.20 10-22-2025 Swale 1 25-YR (2%) Channel 6 TRAPEZOIDAL DISCHARGE Bottom Width = 2.00 ft Method = Known Q Side Slope Left, z:1 = 3.00 Known Q = 9.02 cfs Side Slope Right, z:1 = 3.00 Total Depth = 2.00 ft Invert Elevation = 1.00 ft Channel Slope = 2.000 % Manning's n = 0.030 CALCULATION SAMPLE Flow Depth Area Velocity WP n-value Crit Depth HGL EGL Max Shear Top Width (cfs) (ft) (sqft) (ft/s) (ft) (ft) (ft) (ft) (lb/sqft) (ft) 9.02 0.62 2.39 3.77 5.92 0.030 0.63 1.62 1.84 0.77 5.72

SWALE 2

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)

Project Name: New Project Hydrograph Report Studio Express by Hydrology Studio v 1.0.0.20 10-22-2025 Swale 2 Hyd. No. 2 Hydrograph Type = Rational Peak Flow = 0.507 cfs Storm Frequency = 10-yr Time to Peak = 10 min Time Interval = 1 min Runoff Volume = 304 cft Drainage Area = 0.17 ac Runoff Coeff. = 0.58 Tc Method = User-Defined Time of Conc. (Tc) = 10.0 min IDF Curve = West Orange Rainfall.idf Intensity = 5.142 in/hr Freq. Corr. Factor = 1.00 Asc/Rec Limb Factors = 1/1 10-Yr, Qp = 0.51 cfs 1 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (min) Swale 2 -1-

Project filename: Swale Sizing Calcs.stx Channel Report Studio Express by Hydrology Studio v 1.0.0.20 10-22-2025 Swale 2 10-YR Channel 2 TRAPEZOIDAL DISCHARGE Bottom Width = 2.00 ft Method = Known Q Side Slope Left, z:1 = 3.00 Known Q = 0.51 cfs Side Slope Right, z:1 = 3.00 Total Depth = 1.50 ft Invert Elevation = 1.00 ft Channel Slope = 1.000 % Manning's n = 0.030 CALCULATION SAMPLE Flow Depth Area Velocity WP n-value Crit Depth HGL EGL Max Shear Top Width (cfs) (ft) (sqft) (ft/s) (ft) (ft) (ft) (ft) (lb/sqft) (ft) 0.51 0.17 0.43 1.20 3.08 0.030 0.12 1.17 1.19 0.11 3.02

Project Name: New Project Hydrograph Report Studio Express by Hydrology Studio v 1.0.0.20 10-22-2025 Swale 2 Hyd. No. 2 Hydrograph Type = Rational Peak Flow = 0.571 cfs Storm Frequency = 25-yr Time to Peak = 10 min Time Interval = 1 min Runoff Volume = 343 cft Drainage Area = 0.17 ac Runoff Coeff. = 0.58 Tc Method = User-Defined Time of Conc. (Tc) = 10.0 min IDF Curve = West Orange Rainfall.idf Intensity = 5.795 in/hr Freq. Corr. Factor = 1.00 Asc/Rec Limb Factors = 1/1 25-Yr, Qp = 0.57 cfs 1 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (min) Swale 2 -1-

Project filename: Swale Sizing Calcs.stx Channel Report Studio Express by Hydrology Studio v 1.0.0.20 10-22-2025 Swale 2 25-YR Channel 4 TRAPEZOIDAL DISCHARGE Bottom Width = 2.00 ft Method = Known Q Side Slope Left, z:1 = 3.00 Known Q = 0.57 cfs Side Slope Right, z:1 = 3.00 Total Depth = 1.50 ft Invert Elevation = 1.00 ft Channel Slope = 1.000 % Manning's n = 0.030 CALCULATION SAMPLE Flow Depth Area Velocity WP n-value Crit Depth HGL EGL Max Shear Top Width (cfs) (ft) (sqft) (ft/s) (ft) (ft) (ft) (ft) (lb/sqft) (ft) 0.57 0.18 0.46 1.25 3.14 0.030 0.13 1.18 1.20 0.11 3.08

= = APPENDIX E Stormwater Quality Calculations