CANALS DAMS!
AND
WITH 25 SCIENCE PROJECTS FOR KIDS
Anita Yasuda
Illustrated by Mike Crosier
Titles in the Explore Engineering Set
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CONTENTS Timeline . . . iv Introduction . . . 1 Let’s Explore Canals and Dams Chapter 1 . . . 12 Why Do We Build Canals and Dams? Chapter 2 . . . 25 Engineering and Design Chapter 3 . . . 38 Building Dams Chapter 4 . . . 54 Cool Canals Chapter 5 . . . 67 Famous Canals and Dams Glossary * Metric Conversions Resources * Essential Questions * Index
Interested in primary sources? Look for this icon. Use a smartphone or tablet app to scan the QR code and explore more! Photos are also primary sources because a photograph takes a picture at the moment something happens. If the QR code doesn’t work, there’s a list of URLs on the Resources page. Or, try searching the internet with the Keyword Prompts to find other helpful sources.
KE YW OR D PR OM PTS canals and dams
TIMELINE 1200 BCE– 800 BCE:
3000 BCE:
Jawa Dam is built in Mesopotamia.
Ancestors of Native Americans build Las Capas in present-day Arizona. This is the oldest canal system in North America.
2700 BCE:
The ancient Egyptians build one the earliest dams, the Sadd el-Kafara Dam along the Nile River.
520 BCE– 510 BCE:
Persian emperor Darius I builds a canal from the Nile River to the Red Sea.
THIRD– THIRTEENTH CENTURY CE: The
FIFTH CENTURY CE:
1179–1209:
1500:
The Naviglio Grande is a canal built to bring marble from quarries to Milan, Italy, for use on a cathedral.
Artist and scientist Leonardo da Vinci invents the mitered lock gate, allowing canals of different levels to be joined together.
1642:
The Briare Canal in France joins the Seine River to the Loire River. Parts of the canal descend 206 feet in 32 miles.
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Chinese build several dams and canals to prevent flooding and to improve transportation.
Work begins on the 1,100-mile Grand Canal in China. It is completed during the Sui Dynasty (581– 618 CE).
1825:
1718:
The Erie Canal in New York State opens. It connects the Great Lakes to the Atlantic Ocean and opens western states to development.
A system of levees is built to control flood waters along the Mississippi River at New Orleans, Louisiana.
1869:
The Suez Canal joins the Mediterranean Sea to the Red Sea. Cargo ships no longer have to sail the 6,000-mile-route around the tip of Africa.
TIMELINE 1942:
1936:
Work is completed on the Hoover Dam on the border of Nevada and Arizona. The dam harnesses the power of the Colorado River.
The Grand Coulee Dam on the Columbia River in the state of Washington opens. It is one of the largest concrete structures in the world.
1942:
The AllAmerican Canal opens along the border between the United States and Mexico. It is the longest irrigation canal in the world, bringing water from the Colorado River to California.
1959:
The Saint Lawrence Seaway opens, linking the Great Lakes to the 1914: Atlantic Ocean through The Panama a series of canals Canal is built across 1970: and locks. the Panama Isthmus, The Aswan linking the Atlantic and High Dam on the Pacific Oceans. Cargo ships Nile River opens. It no longer have to sail FUTURE: creates a 300-milethe long route around When finished, long reservoir called the tip of South the Rogun Dam in Lake Nasser. America. Tajikistan will be the tallest dam in the 1902: 1982: world at 1,263 The first Built by Brazil feet tall. Aswan Dam on and Paraguay, the 2003: the Nile River is Itaipu Dam on the Three Gorges completed. For its time, Paraná River opens. The Dam across the the dam is a marvel dam is one of the largest Yangtze River in China of engineering. hydroelectric dams in begins operating. It is the world. the world’s largest hydroelectric dam.
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INTRODUCTION
LET’S EXPLORE CANALS AND DAMS Have you ever traveled down a river in a boat? Rivers are very useful for getting people and things from one place to another. But what if there is no natural river flowing where people and things need to travel? One solution is to dig a canal ! A canal is a manmade channel of water. Often, you’ll find canals working together with dams . Canals and dams are both structures that change the flow of water. This is useful for transportation, producing electricity, and getting water where it’s needed.
WORDS
TO
KNOW
canal: a manmade channel used to deliver water.
dam: a wall, usually built across moving water, that holds some of it back. structure: something that
is built, such as a building, bridge, or tunnel.
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CANALS AND DAMS! engineering: using science, math, and creativity to design and build things. irrigation: moving water
through canals, ditches, or tunnels to water crops.
Canals and dams often work together as part of a system. One allows water to flow and the other stops water from flowing.
Have you ever heard of the Hoover WORDS KNOW Dam? This dam supplies 1.3 million people in Nevada, Arizona, and California with electricity. It sends water to people hundreds of miles away. It’s as tall as a 60-story building! The Hoover Dam is an engineering marvel that is part of a system of canals and dams that allowed many of the great cities of the American Southwest to grow and thrive. TO
WHAT ARE CANALS?
A canal is built to move water from one place to another or to connect two bodies of water. Why would you want to do this?
Sometimes, people live far away from the water they need. Canals can bring water to farms, which can be used for irrigation to grow crops. Farm animals also need water. Canals can bring water to cities so people living there have water to drink and bathe in.
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LET’S EXPLORE CANALS AND DAMS
THE ALL-AMERICAN CANAL
(CREDIT: CHARLES O’REAR, NATIONAL ARCHIVES)
For example, water from the Colorado River is brought by the All-American Canal from the Imperial Dam in Arizona to California’s Imperial Valley. The valley has some of the most important farmland in the state. Approximately 75 different types of crops are grown there.
If you have a sip of tap water at the Disneyland Resort in Anaheim, California, it might have come from the Colorado River. Or it might have traveled all the way from the north of the state through a system of canals.
Canals are also built to link two bodies of water. This can make it easier for ships to get from one place to another. Before the Panama Canal was built in 1914, ships had to travel thousands of miles all the way around the tip of South America.
3
CANALS AND DAMS! reservoir: an artificial lake
used for storing water.
Going around South America was the only way to get between the WORDS TO KNOW Atlantic Ocean and the Pacific Ocean. Now, using the Panama Canal, ships can cut across Panama, traveling the 48 miles in just 8 to 10 hours.
WHAT ARE DAMS?
A dam is an incredibly useful type of wall. It slows or holds back the flow of water. A dam is usually built across a river or a stream. As the dam slows the water down, an artificial lake forms behind it. This lake is called a reservoir.
A reservoir is like a giant bowl. Unlike the bowls in your kitchen, reservoirs can hold billions of gallons of water.
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LET’S EXPLORE CANALS AND DAMS force: a push or a pull
What can you do with all this water? Lots of things. You can build a canal to move some of it to where you need it! Or enjoy boating and swimming in it. The water held back by a dam can even be used to make electricity.
that causes a change of motion in an object.
gravity: a force that pulls objects to the earth.
collapse: to fall in or down suddenly.
engineer: someone
who uses science, math, and creativity to solve problems.
A dam can be one of the biggest structures in the world. It must WORDS TO KNOW be strong and stable to resist the forces pushing and pulling on it. The weight and flow of water is a force that pushes against a dam. Gravity is a physical force created by the earth that pulls down on the dam. If a dam doesn’t resist these forces, it will collapse.
BEAVER DAM Most of the dams we’ll read about in this book are constructed by people, but humans are not the only ones who make dams! The American beaver is a busy engineer famous for its dam-building skills. Beavers build dams out of trees, branches, twigs, and mud to turn streams into ponds. In Wood Buffalo National Park in Alberta, Canada, the largest beaver dam in the world is approximately 2,790 feet long. That is twice the length of Hoover Dam, or roughly the length of nine football fields! The dam is so large that it can be seen from space. You can see the official Parks Canada video showing this enormous dam at this website.
KE YW OR D PR OM PTS eo Canada beaver dam vid
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CANALS AND DAMS! continent: one of seven large landmasses in the world.
CANALS AND DAMS ARE EVERYWHERE
environment: the natural
TO
KNOW
WHAT DID
n wi a n be en nice g
g
It ’s
You will also read about the earliest, largest, and most important canals and dams in the world. Some of these recordbreakers are in the United States. One might DID YOU KNOW? be near you! There are more than 57,000 big Ready? Grab your hard hat—there are canals and dams to explore!
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E?
The book will also share some cool facts. Some dams are giant mega structures. They make the pyramids of Egypt look small. These super dams stand as tall as skyscrapers!
E TR
TH
E
In this book, you’ll discover what canals and dams R SAY TO AVE TH are, why we build them, and how they impact BE E people and the environment . You’ll learn about how engineers approach problems by using the engineering design process to find solutions. You’ll even use the engineering design process to work on your own engineering projects!
u!
WORDS
Canals and dams are built all over the world. In fact, people have built canals and dams in six of the seven continents (Asia, Africa, North America, South America, Europe, and Australia).
yo
world in which people, animals, and plants live.
dams all around the world! Lots of planning goes into a dam.
LET’S EXPLORE CANALS AND DAMS prototype: a model of something that allows engineers to test their ideas.
GOOD ENGINEERING PRACTICES
WORDS
TO
KNOW
Engineers and scientists keep their ideas organized in notebooks. Engineers use the engineering design process to keep track of their inventions, and scientists use the scientific method to keep track of experiments. As you read through this book and do the activities, record your observations, data, and designs in an engineering design worksheet or a scientific method worksheet. When doing an activity, remember that there is no right answer or right way to approach a project. Be creative and have fun! Engineering Design Worksheet Problem: What problem are we trying to solve? Research: Has anything been invented to help solve the problem? What can we learn? Question: Are there any special requirements for the device? What is it supposed to do? Brainstorm: Draw lots of designs for your device and list the materials you are using! Prototype: Build the design you drew during brainstorming. This is your prototype.
Scientific Method Worksheet Question: What problem are we trying to solve? Research: What information is already known? Hypothesis/Prediction: What do I think the answer will be? Equipment: What supplies do I need?
Results: Test your prototype and record your observations.
Method: What steps will I follow?
Evaluate: Analyze your test results. Do you need to make adjustments? Do you need to try a different prototype?
Results: What happened and why?
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PROJECT! ENGINEERING NOTEBOOK Leonardo da Vinci (1452–1519) was an artist and engineer. Many people know him for painting the Mona Lisa. Fewer know that he was also interested in the flow of rivers. He filled a 7,000page notebook with ideas and drawings! Create your own engineering notebook to write down your research, questions, and ideas.
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SUPPLIES **6 standard envelopes **glue stick **crayons, colored pencils, stickers **24 notecards to fit envelopes (or make notecards from plain scrap paper) **scrap paper **pencil **ribbon or string **scissors **clear tape
Spread out your envelopes in a straight line. Do not glue the first envelope. Place glue on the flap of the second envelope. Press the bottom of the first envelope onto the glue. Continue to glue the envelopes together until they look like an accordion.
2
On the front of the first envelope, use your crayons and colored pencils to add decoration. You can also add stickers. Insert four notecards into each envelope.
3
From the scrap paper, cut out six labels for your envelopes. Use the pencil to write down the chapter headings. Glue one label to each envelope. Decorate them with your crayons or colored pencils.
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BCE: put after a date, BCE stands
for Before Common Era and counts years down to zero. CE stands for Common Era and counts years up from zero. This book was published in 2018 CE.
PROJECT! 4
ancestor: someone from your
Cut two pieces of ribbon roughly 4 inches in length.
family or culture who lived before you.
5
Tape the end of each WORDS TO KNOW ribbon to either end of your accordion notebook. You can tie your notebook shut when you are not using it. In 1200 BCE , ancestors of Native If you want to make Americans built canals to carry water your book larger, from the Santa Cruz River to their fields in what is now Tucson, Arizona, simply remove the where they grew crops such as ribbon and add maize. Today, a 335-mile more envelopes canal that begins near Lake with more Havasu supplies Tucson, notecards.
DID YOU KNOW?
Arizona, with 44 billion gallons of water each year.
ESSENTIAL QUESTIONS Each chapter of this book begins with an essential question to help guide your exploration of canals and dams. Keep the question in your mind as you read the chapter. At the end of each chapter, use your engineering INVESTIGATE! notebook to record your thoughts and answers. What problem do you
?
see that you would like to fix? What can you invent to solve it?
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SUPPLIES
PROJECT! ENGINEER A BEAVER DAM Beavers are amazing engineers. Do you think that you can build a dam as well as a beaver? This is your chance to try. Design, create, and test your own model of a beaver dam.
1
Place tinfoil on the baking sheet or container. Mold the foil high on the sides. This will allow you to add more water to the experiment.
**tinfoil **baking sheet with deep sides or long plastic container **sticks, pinecones, and pebbles **plastic jug **engineering notebook and pencil **drying cloth **modeling clay
2
Place your container on a flat surface, inside or outside. Create a dam using sticks, pinecones, and pebbles in the center of the tray. What is the problem you are trying to solve? Take a notecard out of your engineering notebook and set up a scientific method worksheet. Write down what you think will happen when you pour water onto the tray.
3
Next, pour a little water into one end of the tray and observe what happens. Write down your results in your worksheet. How were your results similar or different from your prediction?
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PROJECT! 4
Remove the sticks. Dry your tray with the cloth. Now, rebuild your dam using modeling clay for mud. Write down what you think will happen when you pour water onto the tray.
5
Pour a little water at the top of the tray and observe what happens. Record your results in your scientific method worksheet. How were your results similar or different from your prediction?
TRY THIS! Use the engineering design process to design and build a
better dam with some additional natural items, including leaves, bark, and grass. Can you build the dam higher and thicker? Try using more water or building a longer river with tinfoil. Test it outdoors! Keep track of your designs and results in an engineering design worksheet.
FORCES There are forces all around you. You can’t see them, but you can see what they do. Have you ever kicked a ball, used a remote control, or written on a piece of paper? Then you have used push as a force to move the ball, button, or pencil. Have you ever opened a drawer, played tug of war, or put on a pair of socks? You have used pull as a force to move the drawer, a person, and your socks. What are some other ways you use pushing and pulling forces at school and home?
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