Presentation is loading. Please wait.

Presentation is loading. Please wait.

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.

Published byAshley Stafford Modified over 6 years ago

Similar presentations

Presentation on theme: "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."— Presentation transcript:

1

2

3

4 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 © LoveLearning 2014

5

6

7 Controlling Floods Dams also hold back sediment that rivers usually carry Prevents beaches and floodplains from being formed © LoveLearning 2014

8 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

9

10 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 People have built structures that prevent erosion Groins and seawalls © LoveLearning 2014

11 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

12 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

13 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

14 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

15 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

16 © LoveLearning 2014

17 Other science, social studies, common core math, and writing resources
Terms of Use Thank you for downloading this product! The purchase of this product entitles you to single classroom use. Please be respectful of my work and do not share with your entire grade level or post this anywhere online (including your personal website). If you wish to share this with colleagues, please purchase multiple user licenses. If you have any questions or need clarification, please contact me at Other science, social studies, common core math, and writing resources

18 Graphics From:

Download ppt "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."

Similar presentations

Human Impact on Beaches

Human Impact on Beaches
Shaping Earth’s Surface

Shaping Earth’s Surface
Introduction To Earth Science. Earth’s Changing Surface.

Introduction To Earth Science. Earth’s Changing Surface.
WAVES. HOW DO WAVES FORM =The energy in waves come from wind that blows across the water’s Surface.

WAVES. HOW DO WAVES FORM =The energy in waves come from wind that blows across the water’s Surface.
Review Name the four parts of a circuit What material is the wire made out of? Would the circuit work if the wire was made out of plastic? © LoveLearning.

Review Name the four parts of a circuit What material is the wire made out of? Would the circuit work if the wire was made out of plastic? © LoveLearning.
Destructive Processes Weathering is the breakdown of rocks by the action of rain, cold, snow, etc. at or near Earth’s surface. Mechanical weathering breaks.

Destructive Processes Weathering is the breakdown of rocks by the action of rain, cold, snow, etc. at or near Earth’s surface. Mechanical weathering breaks.
Chapter 2: Landforms of Georgia Lesson 4: How Do Humans Change Landforms? S5E1c: Students will relate the role of technology and human intervention in.

Chapter 2: Landforms of Georgia Lesson 4: How Do Humans Change Landforms? S5E1c: Students will relate the role of technology and human intervention in.
The Role of Technology and Human Interventions In Destructive and Constructive Processes.

The Role of Technology and Human Interventions In Destructive and Constructive Processes.
6 th Grade Science. Soil Erosion The wearing away of soil Loss of soil.

6 th Grade Science. Soil Erosion The wearing away of soil Loss of soil.
Changing Earth’s Surface Changing Earth's Surface Weathering –The process that breaks down and changes rocks that are exposed at Earth’s surface 8.1.

Changing Earth’s Surface Changing Earth's Surface Weathering –The process that breaks down and changes rocks that are exposed at Earth’s surface 8.1.
Ocean Waves 6 th Grade. Ocean Waves 9_ocean_waves/ocean_waves.html#slide

Ocean Waves 6 th Grade. Ocean Waves 9_ocean_waves/ocean_waves.html#slide
This house sits on the top of a hill that is covered with loose soil and rocks. The new owners of this house have some concerns about their property. What.

This house sits on the top of a hill that is covered with loose soil and rocks. The new owners of this house have some concerns about their property. What.
The Rock Cycle Rocks are any solid mass of mineral or mineral-like matter that occurs naturally on Earth.

The Rock Cycle Rocks are any solid mass of mineral or mineral-like matter that occurs naturally on Earth.
Twenty Questions Erosion and Deposition Twenty Questions 12345 678910 1112131415 1617181920.

Twenty Questions Erosion and Deposition Twenty Questions
Take out a sheet of paper and a pencil, please. I will give you 1 minute to write down everything in this room that is MATTER. Ready…set…GO! Now, turn.

Take out a sheet of paper and a pencil, please. I will give you 1 minute to write down everything in this room that is MATTER. Ready…set…GO! Now, turn.
 Provides land/space on which to live  Provides necessary resources required for survival, like food and fuel.

 Provides land/space on which to live  Provides necessary resources required for survival, like food and fuel.
Single-Celled Organisms Single-Celled organisms are simple life-forms – They move, find food, grow, and reproduce © LoveLearning 2014.

Single-Celled Organisms Single-Celled organisms are simple life-forms – They move, find food, grow, and reproduce © LoveLearning 2014.
Plants and Animals Plants and animals are made up of millions and millions of tiny parts called cells © LoveLearning 2014.

Plants and Animals Plants and animals are made up of millions and millions of tiny parts called cells © LoveLearning 2014.
Coasts. Wave erosion coasts formed by the force of waves as they strike the land the waves strike the land and pieces of rock are broken off the wave.

Coasts. Wave erosion coasts formed by the force of waves as they strike the land the waves strike the land and pieces of rock are broken off the wave.
Rock & Landforms I-5. Moving Water and Landscapes Water runs downhill –GRAVITY! Water runs downhill –GRAVITY!

Rock & Landforms I-5. Moving Water and Landscapes Water runs downhill –GRAVITY! Water runs downhill –GRAVITY!

Similar presentations

Ads by Google