(i) Too little merely wets the surface and does not get into rocks to become underground water.
(ii) Heavy downpour saturates the surface, thus blocking the passage that the water would use to get into the ground. This reduces the rate of infiltration and increases surface run-off.
(iii) Light rain which falls over a long period infiltrates the ground more than a heavy downpour which is short-lived.
(iv) Rainfall is the major source of underground water. Even melt water from snow is derived from precipitation in form of snow. The amount of rainfall that infiltrates the ground depends on the type, amount and intensity of rainfall.
maurice.mutuku answered the question on June 9, 2017 at 12:31
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