Hydraulics and Fluid Mechanics in ME
The discharge through a channel of trapezoidal section is maximum when

Width of channel at the top is equal to twice the width at the bottom
Depth of channel is equal to the width at the bottom
The sloping side is equal to half the width at the top
The sloping side is equal to the width at the bottom

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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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