Rebecca Pettiford - Dams

Pogo Books let children practice
reading informational text while
introducing them to nonfiction
features such as headings, labels,
sidebars, maps, and diagrams,
as well as a table of contents,
glossary, and index. Carefully leveled text with
a strong photo match offers
early fluent readers the support
they need to succeed. Walk through the book and
point out the various nonfiction
features. Ask the student what
purpose each feature serves. Look at the glossary together.
Read and discuss the words. Have the child read the book
independently.

Invite him or her to list questions
that arise from reading.

Discuss the childs questions.
Talk about how he or she might
find answers to those questions. Prompt the child to think more.
Ask: What is the biggest dam
you have ever seen? Pogo Books are published by Jump! 5357 Penn Avenue South Minneapolis, MN 55419 www.jumplibrary.com Copyright 2016 Jump! International copyright reserved in all countries. No part of this book may be reproduced in any form
without written permission from the publisher. Library of Congress Cataloging-in-Publication Data Pettiford, Rebecca, author. pages cm. (Amazing structures) Audience: Ages 79. (Amazing structures) Audience: Ages 79.

Includes bibliographical reference and index. ISBN 978-1-62031-213-1 (hardcover: alk. paper) ISBN 978-1-62496-300-1 (ebook) 1. DamsJuvenile literature. I. Title.

TC540.P43 2016 627.8dc23 2014042534 Series Editor: Jenny Fretland VanVoorst Series Designer: Anna Peterson Photo Researcher: Anna Peterson Photo Credits: All photos by Shutterstock except:
Corbis, . Printed in the United States of America at
Corporate Graphics in North Mankato, Minnesota.

CHAPTER 1
What Is a Dam? CHAPTER 2
How Do We Use Dams? CHAPTER 3
Building Dams We cannot live without water.
Thats why we build dams. People have been building dams
for more than 4,000 years. CHAPTER 1 A dam is a large structure that holds
water in place. It creates a secure,
reliable water supply.

The water that
gathers on one side of the dam
is called a reservoir. reservoir CHAPTER 1

Water weighs a lot.
To control it, dams need
to be large and strong. There are several types of
dams. Some are made from
concrete . Others are made
of earth. How do we use dams?
Lets find out.

DID YOU KNOW? Have you ever seen
a beaver build a dam
with mud and sticks?
The dam turns a stream
into a pond. The pond creates an
environment that provides the beaver
with everything it needs to live. CHAPTER 1

CHAPTER 1 By controlling the flow of water,
a dam can prevent flooding. CHAPTER 2 It can direct water to farmland. Drinking water often comes from a reservoir. CHAPTER 2 generator CHAPTER 2 Dams can use water to make
electricity.

This is called
hydroelectricity . The force of the water
turns blades in a turbine .
The turbine then turns a
generator . The generator
makes electricity, which
can power your house! TAKE A LOOK! How can a dam turn water into power?
Look inside! power lines dam reservoir generator water
intake turbine river CHAPTER 2

Changes in a rivers water
level can make it hard for
boats to navigate . A dam can keep a rivers
water level steady. How does it do this? It uses locks and spillways . CHAPTER 2 spillway CHAPTER 2 A lock is a gated waterway built
alongside a dam.

When a boat
enters, the gates close.
Depending on which way
the boat is going, the water
level goes up or down. To keep the water depth
steady, spillways open and
close to let water through. CHAPTER 2

gates spillway CHAPTER 2 CHAPTER 3 Dams often have more than one use. The Oroville Dam in California
supplies water and power. It also
controls floods. It is feet
( meters ) tall.

Thats about
as tall as second graders
standing on top of one another! DID YOU KNOW? The dams in the Tennessee Valley
Authority provide power, flood control,
navigation, and drinking
water. They serve
nine million people in
seven southern states. CHAPTER 2

Civil engineers build dams.
They learn how much water
the dam needs to support. CHAPTER 3 They decide how big and strong