A stream joining a larger stream is the same thing as a stream joining a river. It's called a tributary.
They contribute to the river: They are Tributaries.
A confluence.A stream that flows into a larger stream is a tributary.
An increase in gradient will generally increase stream velocity.
A stream is termed a braided stream because instead of having one main channel there are many parallel branches of the stream flowing near each other, forming a inter-weaving system of stream...