Definition of Runff

That portion of precipitation or irrigation on an area which does not infiltrate, but instead is discharged from the area. That which is lost without entering the soil is called surface runoff. That which enters the soil before reaching a stream channel is called ground water runoff or seepage flow from ground water. (In soil science runoff usually refers to the water lost by surface flow; in geology and hydraulics runoff usually includes both surface and subsurface flow.)

run off

To flee or depart quickly.
Don't run off before the end of the event.
(idiom) To make photocopies.
Please run off a couple dozen more flyers to pass out.
(with with) To steal or abscond.
He ran off with my wallet.
(of a liquid) To pour or spill off or over.
They kept a barrel to store rainwater that has run off the roof.

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