Question

A rainfall intensity of 75amh is falling over an area covering 40,000m2 Calculate the storm water rin-off (m/s) and size/dimension a "U" drain and the Hydraulic Radius to carry such a flow. The U drain should have a free board of 0.45m at peak flow capulty and a slope of 5960, The drain is to have a maximum hydraulic heigh of 0.3m. Roughness factor 0.013 and run-off coefficient (C) 0.75. Sketch and label the drain section

Answer 1