With reference to an example which you have studied, describe and explain one way in which humans attempt to control river processes or marine(sea) processes or mass movement. - Leaving Cert Geography - Question 1 - 2006

Dams are constructed to regulate and control river flow, preventing flooding and managing water supply.

Dams are built across rivers to create a reservoir, which stores water and helps control the river's natural flow. This controlled flow allows for irrigation, drinking water supply, and recreational activities. Dams can significantly reduce the risk of downstream flooding during heavy rainfall and snowmelt.

1. Flood Control: Dams absorb floodwaters and release them gradually.
2. Hydroelectric Power Generation: Dams convert water flow into electricity, providing renewable energy.
3. Recreation: Reservoirs created behind dams offer opportunities for boating and fishing.
4. Irrigation Support: Controlled water flow ensures a reliable agricultural water source.
5. Ecosystem Management: Some dams include fish ladders to support wildlife.
6. Water Supply: Dams store water for urban areas, ensuring a stable supply.
7. Sediment Control: Dams trap sediment, which can help maintain water quality downstream.

A well-known example of a dam is the Hoover Dam in the United States, which provides flood control, water storage, and hydroelectric power.