They are called naiads.
Rivers and streams that flow in to a larger river are called tributaries. They all form in the same spot.
alluvial
drought
It is usually the other way round. Moving in the direction of water flow, streams merge together to form larger rivers, the streams are called the river's tributaries. The point of joining is called a "confluence".
Runoff water
runoff
Eutrophication?
Brooks........
runoff
Small creeks, streams and rivers that flow into larger rivers are called tributaries
Runoff.
Streams run into larger rivers.