Question

Graded bunding and contour bunding are chosen for a field based primarily on the local rainfall pattern, since higher-rainfall areas require a different design to safely dispose of excess runoff water. Graded bunding, specifically designed for such areas, is generally recommended where the annual rainfall exceeds what threshold?

A 400 mm
B 600 mm
C 1000 mm
D 800 mm
E 1200 mm
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