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The head of water over a rectangular weir is 26 cm. The length of the crest of the weir end contraction suppressed is 1.25 m. Find the discharge using the Francis formula.

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in Fluid Mechanics by (118k points)
The head of water over a rectangular weir is 26 cm. The length of the crest of the weir end contraction suppressed is 1.25 m. Find the discharge using the Francis formula.

(a) 0.304 m^3/s

(b) 0.502 m^3/s

(c) 0.350 m^3/s

(d) 0.625 m^3/s

This question was addressed to me in semester exam.

This key question is from Time Required to Empty a Reservoir with  Weirs or Notches topic in chapter Orifices, Mouthpieces, Notches and Weirs of Fluid Mechanics

1 Answer

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Best answer
The correct option is (a) 0.304 m^3/s

Best explanation: Q = 1.84*L*H^1.5

                        = 0.304 m^3/s.

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