Hydraulics and Fluid Mechanics in ME
The discharge through a channel of trapezoidal section is maximum when

Depth of channel is equal to the width at the bottom
Width of channel at the top is equal to twice the width at the bottom
The sloping side is equal to half the width at the top
The sloping side is equal to the width at the bottom

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Hydraulics and Fluid Mechanics in ME
The flow in a pipe or channel is said to be non-uniform when

The quantity of liquid flowing per second is constant
Each liquid particle has a definite path
The liquid particles at all sections have the same velocities
The liquid particles at different sections have different velocities

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