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Tributary is the answer you are looking for, I believe.
resorvoir
It is called a tributary
Comets have a stream of gas and dust coming off them.
a tributary is a stream coming off a river, and drainage means to drain(duh),e.g water can be drained
A distributary is a stream that branches off and flows away from a main stream channel while a tributary is a stream or river which flows into a mainstem river.
a creek
A small freshwater river or stream flowing into a larger river is called a tributary or feeder river. A tributary is a stream or river that flows into a mainstem (or parent) river or a lake. For example, a tributary can be a creek that flows into a river. Or it can be a small river that flows into a larger river. A tributary does not flow directly into a sea or ocean. Some large rivers can have up to 100 tributaries. The spot where the smaller and larger river meet is called a "confluence". In contrast, a body of water that branches off and flows away from the main river is called a distributary.
A waterfall works by water from a river, stream or lake comes to a cliff, then the water falls off and goes into another river, stream or lake.
A large stream or creek, usually leading to or away from a river. From my understanding, it is called a "branch" because it "branches off" of a larger body of water.
Every river is part of a larger river system which includes the river and any tributaries that branch off of it.
The point where the river starts off is called the