Youtube Exercise » English Grammar Homework

World's LARGEST Dam CRACKS – Kariba's Collapse Drowns 3.5 Million In 8 Hours

Crisis Radar

165K views 2 months ago

Warm-up Questions

What do you think could happen if the world’s largest dam cracks?
Why might people downstream have only a few hours to move?
What kinds of problems could a dam collapse cause besides flooding?

Up Next

Train Your Brain To Get Smarter | Dina Halaseh | TEDxAmman TEDx Talks
READING EXPLORER 1 UNIT 4A LIFE BEYOND EARTH Royal English Centre
WHY You Have The Holy Spirit But Still No Power, Word Of God || Kathryn Kuhlman KathrynKuhlman
Everyday English Conversation Practice (A2) ｜ Shopping for Clothes in English Learn English Easy
Interchange 2 (10. The job interview) Innovation Development

Start With: Word Definition

Order: Alphabetical Random

…

World's LARGEST Dam CRACKS – Kariba's Collapse Drowns 3.5 Million In 8 Hours

Kariba Dam: scale, importance, and the plunge pool problem (00:00 – 03:34)

Transcript will load here…

1. About how much electrical power does Kariba supply to Zambia and Zimbabwe combined?

Roughly 40%
Almost 100%
Roughly 10%
Roughly 70%

2. What is the name of the deep hole carved beneath the dam by turbulent released water?

The spill basin
The flood channel
The scour trench
The plunge pool

3. What were the two primary objectives of the 2014 rehabilitation program?

Reshape the plunge pool and upgrade the spillway gates
Drain Lake Kariba and rebuild the foundation
Raise the dam height and expand the reservoir
Relocate downstream towns and build a new dam

World's LARGEST Dam CRACKS – Kariba's Collapse Drowns 3.5 Million In 8 Hours

Why the risk is complex: geology, cracking, and failure mechanisms (03:34 – 08:32)

Transcript will load here…

1. If Kariba collapses with a full reservoir, what initial flow pulse does the modeling suggest (up to)?

About 70,000 cubic meters per second
About 7,000 cubic meters per second
About 180,000 cubic meters per second
About 13,000 cubic meters per second

2. What kind of rock is the foundation beneath Kariba described as?

Limestone full of caves
Loose river sediment
Fractured quartz mica gneiss
Solid granite with no fractures

3. According to the speaker, in most modeled scenarios Kariba’s failure is not an overnight collapse but a ______ failure.

explosive
piping
surface
thermal

World's LARGEST Dam CRACKS – Kariba's Collapse Drowns 3.5 Million In 8 Hours

On-site evidence, timelines, and what “safe” really means (08:32 – 10:49)

Transcript will load here…

1. At around what depth did the sonar register a 4.7 m wide cavity under the apron?

About 65 m
About 80 m
About 45 m
About 30 m

2. How much had the cavity grown in 12 months?

3 m
3 cm
10 m
30 cm

3. What does the speaker say “safe” means in this context?

The plunge pool has stopped growing
Monitoring data does not currently show a runaway failure mode
The structure has returned to design margins
There is zero chance of failure

World's LARGEST Dam CRACKS – Kariba's Collapse Drowns 3.5 Million In 8 Hours

Transcript will load here…

1. Why is plunge pool erosion particularly dangerous for a large dam?

It prevents flooding downstream
It can undermine the foundation and threaten structural integrity
It increases electricity production automatically
It makes the reservoir water warmer

2. What does a “cascade” failure scenario describe in the video?

A series of unrelated storms across the region
A single gate breaking while the dam remains stable
A gradual reduction in reservoir size over decades
One dam failure triggering overtopping and failures downstream

3. Why does the speaker emphasize that the dam must be rebuilt while full of water?

Because the dam is no longer used for power
Because the risks exist while the reservoir remains under hydrostatic load
Because the dam is being replaced by solar power
Because draining the reservoir is easy and quick

Discussion Questions

Discuss the ideas from this video

World's LARGEST Dam CRACKS – Kariba's Collapse Drowns 3.5 Million In 8 Hours

The video suggests “safe” is an operational definition. What should governments communicate to the public when risks are low but consequences are extreme?
Which is harder to manage: the engineering challenge (repairing the dam) or the social challenge (moving millions of people quickly)? Why?
How should countries cooperate when critical infrastructure (like a river dam) affects multiple nations downstream?
What trade-offs do you see between producing electricity, protecting industry, and ensuring long-term safety?