Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Loss of head and velocity of flow in both the pipes is same
Loss of head and discharge of both the pipes is same
Length of both the pipes is same
Diameter of both the pipes is same

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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
The sloping side 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

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