Virginia Loh-Hagan - Dams
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- Book:Dams
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- Publisher:Triangle Interactive, LLC
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- Year:2018
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Cherry Lake Publishing
Ann Arbor, Michigan
www.cherrylakepublishing.com
West Lafayette, Indiana
Reading Adviser: Marla Conn MS, Ed., Literacy specialist, Read-Ability, Inc.
Knowles/Shutterstock Images, 6; curtis/Shutterstock Images, 8; National Geographic Creative/Alamy Stock Photo, 10;
SF photo/Shutterstock Images, 12; All Canada Photos/Alamy Stock Photo, 14; turtix/Shutterstock Images, 16;
shutterlk/Shutterstock Images, 18
All rights reserved. No part of this book may be reproduced or utilized in any
form or by any means without written permission from the publisher.
Names: Loh-Hagan, Virginia, author.
Title: Dams / by Virginia Loh-Hagan.
Description: Ann Arbor : Cherry Lake Publishing, [2017] | Series: 21st century junior library. Extraordinary engineering |
Audience: K to grade 3. | Includes bibliographical references and index.
Identifiers: LCCN 2016032401| ISBN 9781634721639 (hardcover) | ISBN 9781634722957 (pbk.) |
ISBN 9781634722292 (pdf) | ISBN 9781634723619 (ebook)
Subjects: LCSH: DamsJuvenile literature. | DamsDesign and constructionJuvenile literature.
Classification: LCC TC540 .L64 2017 | DDC 627/.8dc23
LC record available at https://lccn.loc.gov/2016032401
Please visit www.p21.org for more information.
Corporate Graphics
ISBN-13: 978-1-68444-502-8 (e-book)
Synchred Read-Along Version by:
Triangle Interactive LLC
PO Box 573
Prior Lake, MN 55372
Push Back on Water?
Push Back on Water?
Back on Water?
stop water flow. They control water flow. They
support the water behind them. Water pushes
on dams. This force is called pressure .
The pressure is greater at the bottom. So,
engineers build dams in a triangle shape to
hold the pressure. Dams have thick bottoms
and thinner tops. Engineers solve problems
by thinking of many things. Dams must be
strong. They must be waterproof .
Theyre often built in canyons . They create
a large pool of water. This pool is called a
reservoir . It stores water. Water can be
used for farming. It can be used for
drinking. It can be used to create power. It
can be used for fun. Dams also stop
flooding. They can be helpful.
disadvantages of dams. Do you agree or disagree?
Push Back on
Water?
against dams. Dams must push back with
equal force. They must redirect the waters
force. They push it into the ground where it
can support the load. They push it into
canyon walls.
to the ground. This helps resist forces.
Sometimes, the ground isnt strong enough.
Engineers must make solid foundations .
These dams have walls supported by
several buttresses. Theyre beams. They
add more weight to dams. They anchor
and brace dams. Theyre spaced apart.
Theyre placed on the opposite side of the
water. They push the waters forces to the
ground. They stop dams from tipping over.
They hold dams in place.
materials is it made of? What type is it?
Power Station, need strong foundations.
Push Back on Water?
Theyre the largest dams. Theyre the
heaviest dams. Theyre the highest dams.
They have large bases. Their weight holds
back water. It also resists waters forces. It
pushes forces down to the ground. This
means these dams use their gravity. Gravity
is a strong force. It pushes weight
downward.
largest embankment dams.
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