runoff
//ˈrʌnˌɔf//
Noun
runoffSingular
runoffsPlural
1
The draining away of water or other liquid from the surface of an area of land, a building, or other structure.
The runoff from the roof flows into the garden.
2
A further competition, election, or race held after a tie or inconclusive result to determine a winner.
Since no candidate received a majority, a runoff will be held next week.
3
Agricultural or industrial waste material that is carried away by water into streams, rivers, or other bodies of water.
Agricultural runoff from the farms polluted the nearby river.