Luther Aadland (video #2)

"When we put dams in rivers, there are a number of problems that can be created. It changes the continuity of flow of sediment and nutrients from the headwaters downstream by creating this pool. Now, sediment deposited in a pool as it moves downstream simply precipitates out. And over time, this reservoir will fill with sediment, and then the function of that reservoir is ultimately lost. In the downstream area, we tend to have increased energy and a low sediment load. This can cause scour on the bed."