runoff -
Dissolved chemicals, etc, included in such water.
runoff -
A second or further round of an indecisive election, after other candidates often all but the last two have been eliminated.
OmegaWiki Dictionary
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runoff Rate at which water is removed by flowing over the soil surface. This rate is determined by the texture of the soil, slope, climate, and land use cover (e.g. paved surface, grass, forest, bare soil).\n(Source: LANDY)