Over the past 100 years, the United States led the world in dam building. We blocked and harnessed rivers for a variety of purposes. Those purposes include hydropower, irrigation, flood control and water storage.
The U.S. Army Corps of Engineers has catalogued at least 90,000 dams greater than six-feet tall that are blocking our rivers and streams. There are tens of thousands of additional small dams that fall through the cracks of our national inventory.
Read more: https://www.americanrivers.org/threats-solutions/restoring-damaged-rivers/how-dams-damage-rivers/
Visit the Hands-on Investigation Module of the Physics TMA BlueTech Curriculum for curriculum connections.