When a dam is built on a stream, a reservoir forms behind the dam, and this temporarily creates a new base level for the part of the stream above the reservoir. How does the formation of a reservoir affect the stream where it enters the reservoir and what happens to
the sediment it was carrying?
The velocity of the water slows down as it enters the reservoir and the sediment is deposited.
The discharge of the stream increases, causing erosion of the valley walls of the stream as it enters the reservoir.
The velocity of the water speeds up as it enters the reservoir and the sediment is deposited.
The discharge of the stream decreases, causing the sediment to deposit.