Runoff, rill, gully, stream, and river.
RunoffRillGullyStreamRiver
In order from smallest to largest, the sequence is rill, gully, creek, and river. A rill is a very small channel formed by the flow of water, typically found in soil. A gully is larger and formed by the erosion of soil and rock due to water runoff. A creek is a larger watercourse than a gully, and a river is the largest, capable of flowing into larger bodies of water like lakes or oceans.
The list you provided represents a hierarchy of water flow systems. A tributary is a smaller stream that feeds into a larger river. A stream is a general term for any flowing water body, while a rill is a small, narrow channel formed by water runoff, often seen in landscapes. Gully refers to a larger, deeper channel formed by erosion, and finally, the river is a significant watercourse that can be fed by tributaries and other smaller streams.
A rill is a much smaller channel. From Sabreena :)
Stream, river. rivulet, beck, watercourse, rill
Rills are small channels formed by flowing water on a slope, gullies are larger and deeper channels typically caused by erosion, and streams are larger bodies of moving water that can support aquatic life and flow towards a larger body of water like a river or ocean.
The four types of water erosion are sheet erosion, rill erosion, gully erosion, and streambank erosion. Sheet erosion occurs when water flows evenly over a surface, rill erosion happens when small channels are formed in the soil, gully erosion involves larger channels, and streambank erosion is the wearing away of stream banks.
gully
rill erosion takes place when flowing water curves out numerous closely spaced thin chanels while flowing down steep slopes.when rill erosion becomes wider and deeper it forms a heavy type of erosion called gully erosion.
water runnoff
It is a Rill.
gully or maybe a rill if it is smaller