Hydraulics and Fluid Mechanics in ME
Capillary action is due to the

Cohesion of the liquid
Adhesion of the liquid molecules and the molecules on the surface of a solid
Surface tension
All of the listed here

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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 the width at the bottom
The sloping side is equal to half the width at the top

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