Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

log-log plot of friction factor against Reynolds number
log-log plot of relative roughness against Reynolds number
semi-log plot of friction factor against relative roughness
semi-log plot of friction factor against Reynolds number

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

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

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