An increase in runoff and infiltration in an area can be caused by D. Excessive rain.
This is known to be a situation where rainfall is greater than 100mm in an hour.
Hence we can see that for a given area to be infiltrated which is a flow of water from the aboveground into the subsurface, and for a runoff to happen, which is a situstion where there is more water than the ground can absorb, heavy rainfall will cause it.
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