Surface-runoff Definition

noun

Overland flow of excess water (with or without accumulated contaminants) that cannot be absorbed by the ground as infiltration.

When there is very heavy rainfall on California hillsides over a prolonged period, there is almost always ensuing surface runoff.
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Other Word Forms of Surface-runoff

Noun

Singular:
surface-runoff
Plural:
surface runoffs

Origin of Surface-runoff

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Unscrambles

surface-runoff