Floods Lecture Review

Learning Intention

• To identify the factors that can cause floods.

Keywords

• Impermeable: A material that does not allow water to pass through.

• Tributary: A stream or river that flows into a larger river.

• Flash Flood: A sudden, intense flood.

What are Floods?

• Floods occur when water overflows the river's channel.

What Causes Floods?

• Heavy rain is the main cause.

• A burst of heavy rain can cause a flash flood.

• Melting snow can also cause floods.

Factors That Contribute to Flooding

• Heavy Rain: Saturated soil prevents water absorption.

• Impermeable Rock: Rain cannot soak through.

• Steep Land: Rain runs down quickly, reducing soil absorption.

• Tributaries: More tributaries increase flood risk.

• Cutting Down Trees (Deforestation): Reduces water absorption.

• Built-Up Areas (Urbanization): Concrete prevents rain from soaking into the ground.

Real-World Examples

• Deforestation in the Amazon rainforest.

• Urban Development in Shah Alam.

Plenary (True / False)

• Heavy rain is the only cause of floods. (False)

• Cutting down trees reduces flood risks. (False)

• A lot of melting snow can cause floods. (True)

• Afforestation will cause floods (False)

• Concrete and roads will let rain soak into the ground. (False)

Reflection

• What is one new thing you learned today?