Les 7 - §3.3 Risk factors for flooding

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Planning

Risk factors for flooding

Extra opdrachten

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.

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. 

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.

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.

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.

Risk Factors

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

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.

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.

Risk factors

Areas which have been fossilised due to urban development.

Risk factors

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

Extra opdrachten

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

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