Les 7 - §3.3 Risk factors for flooding

Planning
Risk factors for flooding
Extra opdrachten
1 / 19
next
Slide 1: Slide
AardrijkskundeMiddelbare schoolvwoLeerjaar 3

This lesson contains 19 slides, with text slides and 4 videos.

time-iconLesson duration is: 45 min

Items in this lesson

Planning
Risk factors for flooding
Extra opdrachten

Slide 1 - Slide

Key words §3.3
Hurricane (Orkaan):A tropical storm with windspeeds over 200 km per hour.
Peak discharge (Piekafvoer): The max amount of water going trough a river after a rainstorm. If a flood happens this is the moment.
Soil subsidence (bodemdaling): Sinking of the ground.

Slide 2 - Slide

Learning goals
  • Je weet welke gebieden grotere overstromingsrisico’s kennen.
  • Je begrijpt waarom het overstromingsrisico van veel gebieden toeneemt.
  • Je kunt een aantal korte- en lange termijn maatregelen noemen om overstromingsrisico’s te verkleinen. 


Slide 3 - Slide

Risk factors
  • River and coastal plains. As much as 70 percent of the world population lives along rivers or close to the coast. Often in these low-lying areas there is the threat of flooding.
  • Areas at the foot of a mountain with a rocky surface. During heavy rainfall, there is almost no water that can sink into the soil, so all the water goes into the river at the same time. The bed of the river is often too small to absorb this peak discharge.
  • Areas where the melting of the snow coincides with heavy rainfall in the summer.
  • Areas where tropical hurricanes are common. A hurricane causes heavy rainfall and blows the water against the coast, making the sea level much higher.
  • Areas where deforestation is taking place upstream. In heavy rainfall there is no more forest that can hold the water for a while like a sponge. As a result, the water immediately flows into the river.
  • Areas which have been fossilised due to urban development.
  • Areas with soil subsidence due to the pumping up of groundwater.


Slide 4 - Slide

Slide 5 - Slide

Risk factors
River and coastal plains. As much as 70 percent of the world population lives along rivers or close to the coast. Often in these low-lying areas there is the threat of flooding.

Slide 6 - Slide

Risk factors
Areas at the foot of a mountain with a rocky surface. During heavy rainfall, there is almost no water that can sink into the soil, so all the water goes into the river at the same time. The bed of the river is often too small to absorb this peak discharge.

Slide 7 - Slide

Slide 8 - Video

Risk Factors
Areas where the melting of the snow coincides with heavy rainfall in the summer.

Slide 9 - Slide

Slide 10 - Video

Risk factors
Areas where tropical hurricanes are common. A hurricane causes heavy rainfall and blows the water against the coast, making the sea level much higher.

Slide 11 - Slide

Slide 12 - Video

Risk factors
Areas where deforestation is taking place upstream. In heavy rainfall there is no more forest that can hold the water for a while like a sponge. As a result, the water immediately flows into the river.

Slide 13 - Slide

Slide 14 - Video

Risk factors
Areas which have been fossilised due to urban development.

Slide 15 - Slide

Slide 16 - Slide

Risk factors
Areas with soil subsidence (bodemdaling) due to the pumping up of groundwater.

Slide 17 - Slide

Slide 18 - Slide

Extra opdrachten
Box 1a (a, en d), 1b

Hier gaan we het volgende keer meer over hebben

Slide 19 - Slide