Hydraulics and Fluid Mechanics in ME
The discharge through a channel of rectangular section will be maximum, if

Its depth is thrice the breadth
Its depth is twice the breadth
Its breadth is thrice the depth
Its breadth is twice the depth

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Hydraulics and Fluid Mechanics in ME
In open channels, the specific energy is the

Total energy measured above the horizontal datum
Total energy per unit discharge
Total energy measured with respect to the datum passing through the bottom of the channel
Kinetic energy plotted above the free surface of water

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