Question

A trapezoidal channel to be excavated into the ground will be sized to carry Q-200 cfs at normal flow. The bottom slope is So 0.0004 and the Manning roughness factor is n= 0.020. The land surface also has a slope of 0.0004. If cost of excavation is the main concern, which of the alternatives listed below is the best? Neglect free board. b (ft) 10 10 10 rn 1.5 2.0 2.5

Answer 1