what is runoff?I couldnt understand in lets review.

Surface runoff is water from rain,snowmelto other sources that flow over the land surface .It is the water flow that occurs when the soil is infilltrated to full and exess water is flown over the land.This is a major component of water cycle and the primary agent in water erosion.

Runoff that occures on surface before reaching a channel is also called a nonpoint source.If the nonpoint source is contaminated by human activities the runoff is called nonpoint source pollution.

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Runoff is what occurs when rain is not absorbed by the ground on which it falls and so then flows downhill.

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runoff is the movement of landwater to the ocean ,chiefly the form of rivers,lakes,and streams.

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