Multiple choice

As per the Lacey’s method for design of alluvial channels, identify the true statement from the following.

  1. Wetted perimeter increases with an increase in design discharge.

  2. Hydraulic radius increases with an increase in silt factor.

  3. Wetted perimeter decreases with an increase in design discharge.

  4. Wetted perimeter increases with an increase in silt factor.
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A Correct answer
Explanation

 As per Lacey's method perimeter $ P = 4.75 \sqrt{Q}$ So, as the wetted perimeter increases design discharge also increases.

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