A dam and reservoir are constructed on a graded river.What will happen?
A)deposition upstream from the dam; channel downcutting below
B)channel downcutting upstream from the dam; deposition below
C)deposition upstream and downstream from the dam
D)channel downcutting upstream and downstream from the dam

Question

Quizplus · Accepted Answer

When a dam is constructed on a river, sediment that would normally be transported downstream accumulates in the reservoir behind the dam, leading to deposition upstream from the dam. Below the dam, the lack of sediment and the often increased water flow can lead to channel downcutting as the river erodes its bed in an attempt to reach a new equilibrium.

A Dam and Reservoir Are Constructed on a Graded River