Question

Among the classification of canals-based alignment criteria, identify the canal in which the number of cross drainage works is maximum?

• A. Contour canal
• B. Side slope canal
• C. Ridge canal
• D. Detour canal

Answer 1

The correct option is A Contour canal

$\text{Contour canal}$

• It is impossible to take the canal on the top of the higher ridge in hilly areas as the ridgeline may be hundred of meters above the river.
• In such conditions, contour canals are usually constructed.
• Contour canals follow a contour, except for giving the required longitudinal slope.
• It irrigates only on one side because the areas on the other side are higher.
• This type of canal necessitates the construction of cross drainage works as the drainage flow is always at right angles to the ground contour.