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Lesson 4 Drought and Floods

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. .

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Lesson 4 Drought and Floods

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  1. Lesson 4 Drought and Floods Chapter 2 – Earth’s Waters

  2. 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.

  3. 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.

  4. 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

  5. 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

  6. 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.

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