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Runoff

UK //ˈrʌn.ɒf// US //ˈrʌn.ɔf// Pronunciation

Definition

Water that flows over land to rivers or lakes, often after rain.

Listen to definition

In simple words: Water that flows over the ground instead of soaking into it.

Examples

• The heavy rain caused a large amount of runoff into the river.
• Urban areas often have more runoff due to pavement and buildings.
• Farmers need to be aware of the effects of runoff on soil erosion.
• Runoff from the fields can pollute nearby water sources.
• There is a runoff issue in the region during the rainy season.

Usage notes

Used in environmental and scientific contexts. Not typically used in casual conversations. Be careful not to confuse it with 'run off'.

Grammar pattern

standalone noun

Memory hint

Think of 'run-off' as water running off the ground.

Collocations

• manage runoff
• prevent runoff
• runoff pollution
• excess runoff

Synonyms

• discharge
• surface runoff
• wastewater
• drainage

Common mistakes

• Confusing with 'run off', which means to leave quickly.
• Using 'runoff' in informal contexts where a simpler term might be better.
• Misunderstanding the environmental implications of 'runoff'.