Flooding and Urbanization Concepts

The video discusses the natural process of flooding, highlighting its benefits to ecosystems and the dangers posed by flash floods. It explains the causes of floods, focusing on runoff and infiltration, and how urbanization increases flood risks. The video also covers flood management strategies and the importance of understanding watershed dynamics.

What is one of the natural benefits of flooding?

• It always causes destruction.

• It deposits sediments and nutrients.

• It prevents any form of plant growth.

• It stops the water cycle.

What is a flash flood?

• A slow-moving flood that lasts for weeks.

• A flood that occurs within hours of heavy rain.

• A flood that only happens in deserts.

• A flood that is beneficial to all ecosystems.

What happens when the amount of runoff exceeds the capacity of drainage channels?

• The water is absorbed by the atmosphere.

• The water evaporates immediately.

• Flooding occurs.

• The water turns into snow.

Which type of runoff occurs just below the soil surface?

• Condensation

• Evaporation

• Interflow

• Surface runoff

What is the effect of impervious surfaces on runoff?

• They stop runoff completely.

• They increase runoff.

• They have no effect on runoff.

• They decrease runoff.

How does urbanization affect the frequency of floods?

• It decreases the frequency.

• It has no impact on the frequency.

• It increases the frequency.

• It stops floods from occurring.

What is one reason floods are more frequent today than 50 years ago?

• More urbanization has taken place.

• Less rainfall occurs now.

• There are fewer rivers now.

• The climate has become colder.

What is stream density?

• The number of fish in a stream.

• The amount of water a stream can hold.

• The efficiency of drainage by tributaries.

• The temperature of the stream water.

How does urbanization affect stream density?

• It decreases stream density.

• It has no effect on stream density.

• It increases stream density.

• It stops stream flow completely.

What is a characteristic of urban streams compared to rural streams?

• Urban streams have slower peak flows.

• Urban streams have faster peak flows.

• Urban streams never flood.

• Urban streams are always cleaner.