12 2026 02 12 Crestmont CC 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 (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