lesson 4 drought and floods n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Lesson 4 Drought and Floods PowerPoint Presentation
Download Presentation
Lesson 4 Drought and Floods

Loading in 2 Seconds...

play fullscreen
1 / 6

Lesson 4 Drought and Floods - PowerPoint PPT Presentation


  • 125 Views
  • Uploaded on

Lesson 4 Drought and Floods . Chapter 2 – Earth’s Waters. Droughts. Are usually caused by dry weather systems that remain in one place for weeks or months at a time. Long-term droughts can devastate regions. A drought reduces the supplies of groundwater and surface water. .

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Lesson 4 Drought and Floods' - kioshi


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
lesson 4 drought and floods

Lesson 4 Drought and Floods

Chapter 2 – Earth’s Waters

droughts
Droughts
  • Are usually caused by dry weather systems that remain in one place for weeks or months at a time.
  • Long-term droughts can devastate regions.
  • A drought reduces the supplies of groundwater and surface water.
predicting and preparing for droughts
Predicting and Preparing for Droughts
  • Droughts are difficult to predict.
  • As soon as the level of rainfall drops below normal, state agricultural officials may contact farmer to warn them.
  • Washing cars and watering lawns are two activities that can be curtailed during a drought.
floods
Floods
  • Small or large, however, all floods occur when the volume of water in a river increases so much that the river overflows its channel.
  • A flooding river can uproot trees and pluck boulders from the ground.
  • Floods are the most dangerous weather-related events in the United States.
  • http://www.youtube.com/watch?v=WqcuX5f6Tk0&feature=related
flash floods
Flash Floods
  • A flash flood is a sudden violent flood that occurs within a few hours, or even minutes of a storm.
  • Some of the most dangerous floods occur in the deserts of the southwestern United States.
  • http://www.youtube.com/watch?v=tHWwvMrOj5E&playnext=1&list=PL0A6EEAE81D004B3D
flood precautions
Flood Precautions
  • Advance warnings help reduce flood damage and loss of life.
  • Building dams is one method of flood control.
  • There is also a natural defense against floods – sediments.
  • Levees that form naturally help keep the river inside its banks.
  • Flood waters can wash into wells and water treatment plants, polluting the water.