Discussion
Which of the following is not an artificial cause of waterlogging?
Answer: A
The cause that is not artificial is Deep percolation from rainfall.
Waterlogging occurs when the water table rises close to the root zone. Rain soaking down through the soil is a natural process, so it is a natural cause.
The other three are man-made. Roads, railways and canals built across natural drainage lines block them; unlined canals lose large amounts of water by seepage into the surrounding land; and over-irrigation of land at higher elevations builds up hydraulic pressure that pushes water into lower areas. Each comes from human works, which is why they are classed as artificial causes.
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