Les 5 - §3.2 sustainable water management

• Aardrijkskunde
• Middelbare school
• vwo
• Leerjaar 3

Planning

• Refresher water balance
• Sustainable water management

Key words §3.2

Water balance (waterbalans): The amount of water that goes into and out of an area

Useful precipitation (nuttige neerslag): The difference between precipitation and evaporation

Fossil water (fossiel water): Water under the ground that dates back to ancient times

Aquifer (Aquifer): Layer that holds water underground

Renewable water sources (vernieuwbaar water): A source of water that replenishes at the same rate it is used

Non-renewable water sources (Niet-vernieuwbaar water): A source of water that barely gets replenished, or not at all. So if it is used it will eventually run out. Like an aquifer.

Sustainable water management (Duurzaam waterbeheer): A way of using water which only uses renewable water sources.

Water balance

Water balance (waterbalans): The amount of water that goes into and out of an area

Water coming in

Three main ways

• Precipitation (neerslag)
• Rivers
• Fossil water (fossiel water): Water under the ground that dates back to ancient times

Water going out

• Evaporation
• Runoff

Sustainable water management

Renewable water sources (vernieuwbaar water): A source of water that replenishes at the same rate it is used

Non-renewable water sources (Niet-vernieuwbaar water): A source of water that barely gets replenished, or not at all. So if it is used it will eventually run out

Which of these sources of water is non-renewable?

1. Rivers
2. Precipitation
3. Aquifers
4. Making water from the air

Positive water balance

A water balance is positive if more water is coming in than going out

Negative water balance

A water balance is negative if less water comes in than goes out

Sustainable water management

Two ways to achieve sustainable water management

• Make sure more water is coming in from renewable sources
• Make sure less water is leaving an area

Water coming in

Three main ways

• Precipitation (neerslag)
• Rivers
• Fossil water (fossiel water): Water under the ground that dates back to ancient times

Sustainable water management

• Desalination plants (making fresh water from salt water)
• Making water from the air

Water going out

• Evaporation
• Runoff

Sustainable water management

• Decrease runoff by building dams
• Prevent evaporation by using more efficient irrigation
• Genetically modified plants that use less water

Time for homework

§3.2 assignment 2ac, 3, 4, 6abc

Teken een waterbalans

Teken er een voor Nederland

Teken er een voor Egypte

Hoe komt water Nederland in?

Hoe komt water Egypte in?

Hoe gaat het eruit

Wat is het belangrijkste verschil?

Presenteer het aan de klas