Heavy runoff after the storm carried pesticides from the fields into the river.

After the heavy storm, several runoffs carried sediment into the river, prompting an emergency cleanup.

After the heavy storm, surface runoff carried oil and sediment from the parking lot into the nearby stream.

After the storm, farm runoff overwhelmed the drainage ditches and carried pollutants into the nearby lake.

Engineers studied the patterns of surface runoffs after the heavy rains to design better drainage systems.

To reduce wasted votes and ensure majority support, the city council proposed implementing instant-runoff voting, in which voters rank candidates and ballots for the lowest-performing candidate are reallocated to voters' next preferences until one candidate reaches the required threshold.