a creek
A tributary.
resorvoir
It is called a tributary
a small stream that runs into a main stem river or lake
The smaller stream is a tributary of a larger stream, river or lake.
When other rivers or lakes join to the main river . It is called the tributary .
exactly what you said the main stream and tributaries
A small river or stream that branches from a larger river is commonly referred to as a tributary. Tributaries contribute to the flow and volume of the main river, often draining into it and enhancing its ecosystem. They can vary greatly in size and length, and their confluence with the larger river can significantly influence the hydrology and sediment dynamics of the area.
A stream or river that feeds into another river is called a tributary. Tributaries play a crucial role in the overall health and flow of a river system, as they contribute water, nutrients, and sediment to the main river.
Geographically - A branch that flows into the main stream is called a Tributary. Literally it means - Paying tribute to. So one can understand as such that a small river is paying tribute to the larger one and shedding its water to large stream.
Creek
A tributary is a river or stream that flows into a larger river or body of water, while a distributary is a branch of a river that flows away from the main channel. Tributaries add water to the main river, while distributaries branch off from it.