Lesson 21 - Human Intervention - Dams and Levees

Introduction

Nature has powerful forces like erosion and weathering. Humans attempt to control these forces and reduce their impacts. People (and animals) build structures to build reservoirs and to protect the land from the powerful forces of nature.

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Dams and Levees

In your Science Journal:

1. 1. Write down today’s Lesson Title at the top of your next Journal page.
   2. Write today’s learning objective on the first line.
   3. Explore the Module 6 - Lesson 21 presentation below. Dams, levees, and dikes all play a critical role in flood prevention. Dams are man-made or beaver-made structures that run through or across bodies of water. Their main purpose is to create a barrier that holds back water, raising its level and resulting in a reservoir that can be used as a water supply, flood control, or to generate electricity. The purpose of a levee is to keep river banks from spilling over or to control the flow of ocean waves. Levees are typically earthen embankments that are designed to control, divert, or contain the flow of water to reduce flood risk.
   4. Write down the important terms and their definitions and important diagrams (yellow boxes) in your Science Journal.

 

 

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