BARRIER AGAINST FLOODS

The video discusses a model of the Thames River, built to evaluate flood protection proposals for London. It highlights two main proposals: a permanent dam or a barrier with gates. The video explains the potential impact of high tides and storms on London, much of which lies below high tide level. It also provides historical context, noting that a barrier was first suggested 200 years ago, and discusses the cost implications of building such a structure today.

What is the purpose of the model built by hydraulic engineers for the Thames River?

• To improve water quality

• To prevent future flooding in London

• To generate hydroelectric power

• To enhance navigation

What are the two proposals being considered to protect London from flooding?

• A permanent dam or a bridge

• A levee or a floodplain

• A barrier with gates or a canal

• A barrage or a barrier with gates

Why is much of London at risk of flooding?

• It is located on a hill

• It is below the level of a high tide

• It has poor drainage systems

• It is surrounded by lakes

What could happen if a high tide coincides with storm conditions in the Thames estuary?

• 50 square miles could be underwater

• The river would dry up

• The river would change its course

• The water level would remain unchanged

How much would the barrier have cost if it had been built when first suggested 200 years ago?

• Twice the current estimate

• A fraction of the current estimate

• The same as the current estimate

• More than the current estimate