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

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

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Hydraulics and Fluid Mechanics in ME
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

unpredictable
from reservoir B to reservoirs C and A
from reservoir C to reservoirs A and B
from reservoir A to reservoirs B and C

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