A trapezoidal channel is to be excavated in alluvial material on a bed slope of 1:10000. The side slopes will be 1(vertical) : 2(horizontal). Details of the bed material are as follows:
Particle diameter 4 mm
Particle density 2650 kg/m3
Angle of internal friction 30°
Manning n 0.02
Determine the depth of flow if the flow is to be non-erosive.