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The maximum permissible reduction in the waterway...

The maximum permissible reduction in the waterway from Lacey’s perimeter is _______

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asked Aug 22, 2023 in Irrigation Engineering by Carter (75.2k points)

The maximum permissible reduction in the waterway from Lacey’s perimeter is _______

(a) 15%

(b) 20%

(c) 25%

(d) 30%

I got this question in examination.

My doubt stems from Cross Drainage Work Design topic in chapter Cross Drainage Work of Irrigation Engineering

irrigation engineering
cross drainage work
cross drainage work design

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answered Aug 25, 2023 by Greg (106k points)

Correct choice is (b) 20%

Easiest explanation: The width of the perimeter should be so adjusted as to provide the required perimeter i.e. minimum value = 0.8P in case of small drains. From Lacey’s perimeter, the maximum permissible reduction in the waterway is 20% and the provision is made in a suitable number of bays or spans.

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