Question

Why continuous contour trenches are used?

(a) To decrease the infiltration of air

(b) To enhance the infiltration of air

(c) To decrease the infiltration of water

(d) To enhance the infiltration of water

This question was addressed to me in final exam.

Question is from Soil and its Pollution in portion Environmental Pollution of Energy Management

Answer 1

Correct answer is (d) To enhance the infiltration of water

The best I can explain: Continuous contour trenches can be used to enhance the infiltration of water. It also used to reduce the run-off and check soil erosion. In areas with steep slopes where bunds are not possible, continuous contour benches are used for the same purpose.