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Question

The most desirable alignment of an irrigation canal is along

A
The contour line
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B
The ridge line
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C
Normal to contour line
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D
The valley line
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Solution

The correct option is B The ridge line
Irrigation water in flow type that should reach the fields by gravity.
To accomplish this requirement irrigation canal is always aligned along a ridge line or watershed line.
(i) The watershed or ridge line is a dividing line between two drainage areas. Thus a canal which runs over the ridge command of area on both sides of ridge
(ii) Another advantage of keeping a canal along ridge is that crossing of drains and canal are completely avoided. Thus minimum cross drainage work.

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