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Fluid mechanics and hydraulics miscellaneous

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Fluid Mechanics and Hydraulics

Fluid mechanics and hydraulics miscellaneous
  1. A rectangular open channel of width 5.0 m is carrying a discharge of 100 m3 /s. The Froude number of the flow is 0.8. The depth of flow (in m) in the channel is
    1. 4
    2. 5
    3. 16
    4. 20
Correct Option: A

Fr =
V
√gy

V =
Q
 =
Q
ABy

=
Q
By√gy

=
Q
B√gy3/2

∴ y =
Q
2/3
B√g. Fr

=
100
2/3 = 4 m .
5 × √9.81 × 0.8


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