A levee is a natural or artificial wall that blocks water from going where we don't want it to go. Levees may be used to increase available land for habitation or divert a body of water so the fertile soil of a river or sea bed may be used for agriculture. They prevent rivers from flooding cities in a storm surge.Jan 21, 2011
Human factors increasing flood risk: urbanisation, because towns and cities have more impermeable surfaces. deforestation, because removing trees reduces the amount of water intercepted and increases run-off.
In addition to helping farmers, dams help prevent the loss of life and property caused by flooding. Flood control dams impound floodwaters and then either release them under control to the river below the dam or store or divert the water for other uses.Jan 8, 2017