Irrigation Engineering
If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

Q = 1/71 BD2/3
Q = 1.71 BD1/2
Q = 1.71 BD3/2
Q = 1.71 BD

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Irrigation Engineering
Pick up the correct statement from the following sentence

The escapes must lead the surplus water to natural drainages
Escapes are essential safety valves in a canal system
All of these
The escapes are aligned to take advantage of contours of lower values

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