I got a dam removal alternative already.

Why are dams useful? They generate electric power, prevent flooding, and save water for times of low rainfall.

Imagine this: A dam beside the river. Let's take the example of the Mississippi.

When flooding occurs, the dam opens up letting the overflow fill vast wetlands beside the river. As the water flows through this dam it turns the blades of water electric generators, they look like windmills, but are mounted underwater. Moving water contains 180 times the power of the equivalent speed and volume of moving air due to water's greater density.

When the water flow is down the dam is opened and water from the wetlands flows into the river, again powering the underwater generators.

The wetlands restore the groundwater levels 100s of miles from the river, that have been depleted by irrigation wells.

Wetlands can be restored even further from the river by using windmills to pump the water further up the river basin.

The aquifer across the farmlands of the midwest are in serious trouble right now. This would solve that problem.

Fish and wildlife could swim right through these dams and around the slow moving blades of these underwater generators.