Explore Courses

Flooding And Its Impact: IELTS Reading Answers

Updated on 02 November, 2023

Akansha Semwal

Akansha Semwal

Study Abroad Expert

Reading answers for IELTS Banner

The best way to ace the IELTS reading examinations is to solve several sample passages. Practice Flooding and its Impact reading answers for IELTS to develop your comprehension skills.

‘Flooding and its Impact’

Floods can occur in rivers when the flow rate exceeds the capacity of the river channel, particularly at bends or meanders in the waterway. Floods often cause damage to homes and businesses if they are in the natural flood plains of rivers. While riverine flood damage can be eliminated by moving away from rivers and other bodies of water, people have traditionally lived and worked by rivers because the land is usually flat and fertile and because rivers provide easy travel and access to commerce and industry.

A Fire and flood are two of humanity’s worst nightmares. People have,therefore,always sought to control them. Forest fires are snuffed out quickly. The flow of rivers is regulated by weirs and dams. At least, that is how it used to be. But foresters have learned that forests need fires to clear out the brash and even to get seeds to germinate. And a similar revelation is now – dawning on hydrologists. Rivers – and the ecosystems they support – need floods. That is why a man-made torrent has been surging down the Grand Canyon. By Thursday March 6th it was running at full throttle, which was expected to be sustained for 60 hours.

B   Floods once raged through the canyon every year. Spring Snow from as far away as Wyoming would melt and swell the Colorado river to a flow that averaged around 1,500 cubic metres (50,000 cubic feet) a second. Every eight years or so, that figure rose to almost 3,000 cubic metres. These floods infused the river with sediment, carved its beaches and built its sandbars.

C   However, in the four decades since the building of the Glen Canyon dam, just upstream of the Grand Canyon, the only sediment that it has collected has come from tiny, undammed tributaries. Even that has not been much use as those tributaries are not powerful enough to distribute the sediment in an ecologically valuable way.

D   This lack of flooding has harmed local wildlife. The humpback chub,for example, thrived in the rust-redwaters of the Colorado. Recently, though, its population has crashed. At first sight, it looked as if the reason was that the chub were being eaten by trout introduced for sport fishing in the mid-20th century. But trout and chub co-existed until the Glen Canyon dam was built, so something else is going on. Steve Gloss, of the United States’ Geological Survey (USGS), reckons that the chub’s decline is the result of their losing their most valuable natural defense, the Colorado’s rusty sediment. The chub were well adapted to the poor visibility created by the thick, red water which gave the river its name, and depended on it to hide from predators. Without the cloudy water the chub became vulnerable.


E   And the chub are not alone. In the years since the Glen Canyon dam was built, several species have vanished  altogether. These include the Colorado pike-minnow, the razorback sucker and the round-tail chub. Meanwhile, aliens including fathead minnows, channel catfish and common carp, which would have been hard to survive in the savage waters of the undammed canyon, have moved in.

F   So flooding is the obvious answer. Unfortunately, it is easier said than done. Floods were sent down the Grand Canyon in 1996 and 2004 and the results were mixed. In 1996 the flood was allowed to go on too long. To start with, all seemed well. The floodwaters built up sandbanks and infused the river with sediment. Eventually, however, the continued flow washed most of the sediment out of the canyon. This problem was avoided in 2004, but unfortunately, on that occasion, the volume of sand available behind the dam was too low to rebuild the sandbanks. This time, the USGS is convinced that things will be better. The amount of sediment available is three times greater than it was in 2004. So if a flood is going to do some good, this is the time to unleash one.

G  Even so, it may turn out to be an empty gesture. At less than 1,200 cubic meters a second, this flood is smaller than even an average spring flood, let alone one of the mightier deluges of the past. Those glorious inundations moved massive quantities of sediment through the Grand Canyon, wiping the slate dirty, and making a muddy mess of silt and muck that would make modern river rafters cringe.

Read more about: Tips For Reading in IELTS Exam | IELTS Academic Reading | IELTS Reading Tips And Tricks | IELTS Reading Band Score IELTS General Reading Test | IELTS Reading Section |

Download E-Books for IELTS Preparation

ielts sample essays

Questions 1-7

Do the following statements agree with the information given in Reading Passage.

In boxes 1-7 on your answer sheet, write


Guidelines/Tip for Answering These Types of Questions: Candidates need to read through the text and then choose whether it is true or false.


if the statement agrees with the information


if the statement contradicts the information


if there is no information on this


1.  Damage caused by fire is worse than that caused by flood.

2.  The flood peaks at almost 1500 cubic meters every eight years.

3.  Contribution of sediments delivered by tributaries has little impact.

4.  Decreasing number of chubs is always caused by introducing of trout since mid 20th century.

5.  It seemed that the artificial flood in 1996 had achieved success partly at the very beginning.

6.  In fact, the yield of artificial flood water is smaller than an average natural flood at present.

7.  Mighty floods drove fast moving flows with clean and high quality water.

Download IELTS Preparation Guide For Free

Get to know about the latest updates on the IELTS Exam, Eligibility, Preparation Tips, Test procedure,  Exam Pattern, Syllabus, Registration Process, Important Exam Dates, and much more!! This guide is a one-stop solution for every IELTS Aspirant who aims to crack the exam with an impressive band score.

Questions 8-13

Complete the summary below.

Choose NO MORE THAN TWO WORDS from the passage for each answer.

Write your answers in boxes 8-13 on your answer sheet.

Guidelines/Tip for Answering These Types of Questions: Candidates need to read through the text and then write the correct answer in not more than two words.

The eco-impact of the Canyon Dam

Floods are people’s nightmare. In the past, canyon was raged by flood every year. The snow from far Wyoming would melt in the season of ________ and caused a flood flow peak in Colorado river. In the four decades after people built the Glen Canyon dam, it only could gather 9 _________  together from tiny, undammed tributaries.

Humpback chub population reduced, why?

Then, several species disappeared including Colorado pike-minnow, 10 ________ and the round-tail chub. Meanwhile, some moved in such as fathead minnows, channel catfish and 11 _________. The non-stopped flow led to the washing away of the sediment out of the canyon, which posed a great threat to the chubs because it had a poor 12 _________ away from predators. In addition, the volume of 13 _________ available behind the dam was too low to rebuild the bars and flooding became more serious.

Learn More about Study Abroad

What is Scholarship

Learn all about the scholarships like types of scholarships and how to get a one


Provincial Nominee Program Canada

Learn all about Provincial Nominee Program (PNP) Canada

PNP Program Canada

Fulbright Scholarship

Learn about the eligibility, benefits, procedure etc about Fulbright Scholarships

Fulbright Scholarship

In paragraph B of the reading passage Flooding and its impact we see the mention of spring snow that would melt and travel to Colorado from Wyoming.


Paragraph C clearly mentions that in the four decades since the Glen Canyon dam was built, the upstream of the Grand Canyon collected sediment that came from small, undammed tributaries.

10razorback sucker

Paragraph E mentions that many species have become extinct altogether since the Glen Canyon dam was built. These include the Colorado pike-minnow, the razorback sucker and the round-tail chub.

11common carp

Paragraph E also states that fish including fathead minnows, channel catfish and common carp, which normally would have found it difficult to live in the severe stream of undammed water of the canyon, have moved in.



Paragraph D talks about how the chubs were used to the thick, red water of the river and depended on it to hide from predators. With the washing away of all the sediment, they had rather poor visibility, thus leaving them vulnerable to predators.


In paragraph F we see that even though in 2004, the problem of sediment being washed out of the canyon was brought under check, that year, the sand available behind the dam was not enough to rebuild the dam.

Study Abroad Without IELTS

Learn More about MS in Data Science in Germany

MS in Data Science in Germany

Save up to 20 Lakhs with upGrad Abroad

Learn More
Learn More about BBA in Canada

BBA in Canada

Study BBA in Canada & save INR 25 Lakhs

Learn More

BCA in the USA

Study BCA in Australia & Save ₹ 20 Lakhs

Learn More

Akansha Semwal

Study Abroad Expert

Akansha Semwal is a content marketer at upGrad and has also worked as a social media marketer & sub-editor. Experienced in creating impressive Statement of Purpose, Essays, and LOR, she knows how to captivate the attention of Admissions Committee. Her research-driven;study-abroad articles helps aspirants to make the prudent decision. She holds a bachelor's & master's degree in Literature from the University of Delhi.

See More



Study Abroad Resources

Top Reads


Other Exams





The above tips are the Author's experiences. upGrad does not guarantee scores or admissions.