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Well, groundwater and runoff both land on Earth as precipitation, but groundwater is water that gets trapped underground by seeping through rocks. You capture this water by wells. Runoff is when precipitation flows from (usually) mountains. The water gets into streams, and streams join to form rivers. The rivers would usually lead to the ocean. Most of the runoff gets evaporated when the water reaches the ocean; only a little-bit of the water in rivers and streams flowing down is evaporated then.
Streams
Into lakes,streams, and rivers
runoff
Run off
Most pollution in streams is caused by agricultural runoff. Many farms and ranches do not take precautions against the runoff.
river, lakes, streams.
Runoff water
Runoff
Runoff
runoff
runoff