Connection to Sediment?:
Water pressure makes the valley shaped like a "V." Because of the pressure of water that makes the valley shaped like a "V," the rocks that fall from the valley transport towards the river or any type of water boundary close to it. This way, any type of sand or rocks that fall into the water, it produces Sediment at the bottom.
What is Deposition?:
Deposition is the process by which water, ice, wind, or gravity moves fragments of rock and soil.