What is the difference between contour bunding and graded bunding?

Contour bunding is constructed along the contour lines. They are constructed with permissible deviation from the contour. When a grade is provided along the bund for safe disposal of runoff water over the area with two consecutive bunds then these are called graded bunding.

The graded bunds, commonly used in India are comparable to the narrow base terraces. They are used for the safe disposal of excess runoff from high rainfall areas.

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