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Hydrology & Irrigation

Lacey’s Regime Theory

A channel des...

Question

A channel designed by Lacey's theory has a mean velocity of 1.28 m/s. The silt factor is unity. The hydraulic mean depth will be ____ m.

4.096

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Solution

The correct option is A 4.096
$R = \frac{5}{2} (\frac{v^{2}}{f}) = \frac{5}{2} (\frac{{1.28}^{2}}{1})$

$= 4.096 ≃ 4.1 m$

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