Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

It has minimum wetted perimeter
All of these
It involves lesser excavation for the designed amount of discharge
It gives maximum discharge for a given cross-sectional area and bed slope

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Hydraulics and Fluid Mechanics in ME
In an inward flow reaction turbine

The water flows parallel to the axis of the wheel
The water enters at the center of the wheel and then flows towards the outer periphery of the wheel
The flow of water is partly radial and partly axial
The water enters the wheel at the outer periphery and then flows towards the center of the wheel

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