Hydraulics and Fluid Mechanics in ME
The conditions for the stable equilibrium of a floating body are

the center of buoyancy and the center of gravity must lie on the same vertical line
the meta-center should lie above the center of gravity
all the above are correct
a righting couple should be formed

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

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

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