Discussion
Hilly areas receiving heavy rainfall, where a major portion of the rainfall is to be drained as surface runoff, are suggested to adopt bench terraces with __________.
Answer: A
Such areas should adopt bench terraces sloping inward.
An inward-sloping bench drops towards the hill, so runoff collects at the inner edge of each bench and is led away in a drain along the toe of the riser to a safe outlet. The outer edge and the riser stay dry and protected, which is what is needed in hilly regions of heavy rainfall where much of the rain must leave as surface runoff.
Level benches suit areas of moderate, evenly distributed rainfall on permeable soils, where water is to be held and absorbed. Outward-sloping benches suit low-rainfall areas, since they would send heavy runoff over the riser and erode it. Narrow width is a matter of land slope and use, not a drainage design.
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