Controlling Floods Dams – structures built across a river to control its flow A dam can be opened to let some water through Dams hold back floodwaters.

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Presentation transcript:

Controlling Floods Dams – structures built across a river to control its flow A dam can be opened to let some water through Dams hold back floodwaters at times of heavy rainfall http://www.dameffects.org/ © LoveLearning 2014

Controlling Floods Dams also hold back sediment that rivers usually carry Prevents beaches and floodplains from being formed http://www.brainpop.com/technology/energytechnology/dams/preview.weml © LoveLearning 2014

Controlling Floods Levees also hold back floodwaters Levee: a raised bank of earth built along the edges of a river to prevent flooding Only holds back water during high water levels Sometimes, levees break Click on the title for an interactive site that shows Hurricane Katrina’s effect on New Orleans © LoveLearning 2014

Controlling Erosion A lot of erosion occurs on coasts (like Georgia’s beaches) This erosion eats away beach sand and destroys things that are built on beaches http://www.brainpop.com/science/earthsystem/erosion/preview.weml People have built structures that prevent erosion Groins and seawalls © LoveLearning 2014

Effects on Destructive Processes Groins A structure built at right angles to the beach Traps sand that moves along the shore with longshore currents © LoveLearning 2014

Effects on Destructive Processes Seawalls A structure built parallel to the shore Seawalls absorb the pounding of waves and protects the coast behind it © LoveLearning 2014

Effects on Destructive Processes Beach nourishment When sand from the ocean or nearby rivers is brought in to build up a beach again after erosion has taken place This has been done at Tybee Island and Sea Island in Georgia © LoveLearning 2014

Effects on Destructive Processes Farmers also use different methods to prevent the loss of soil Contour plowing A method in which farmers plow across the sides of hills instead of down their slopes © LoveLearning 2014

Effects on Destructive Processes Terracing A method in which farmers plant crops on terraces built on hillsides Both contour plowing and terracing prevent soil from washing downhill © LoveLearning 2014

© LoveLearning 2014

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