3.2 Water in balance

• Aardrijkskunde
• Middelbare school
• mavo, havo, vwo
• Leerjaar 2

3.2 Water in balance

Part 1

Learning outcomes 3.2

- You know how an area gets fresh water and how it loses fresh water.

- You understand which factors influence the water balance of an area.

- You can explain the importance of sustainable water management.

Look at the picture.

Do you know how a water balance works?

 Water Balance

The water balance shows how much water enters and leaves an area.

infiltration – The sinking of water into the ground.

Take out your notebook and write down (using the picture) three ways how an area can get water.

An area can get water because of:

1. (useful) precipitation

2. supply of water from other areas

3. supply of fossil water, for example from an aquifer, which is a water-bearing layer in the subsurface

Go to page 126.

We will now read the text together under the heading 'water balance'

Aquifer

What is an aquifer?

Aquifer = Water-containing layer in the subsurface.

Precipitation and fossil water

Precipitation

Infiltration

Groundwater

Porous rock/Aquifer

Impermeable layer

Aquifer: waterhoudende laag in de ondergrond.

HW GEO:

Complete assignments 1, 2 and 3 of 3.2 on pages 128 and 129

3.2 Water in balance

Part 2

Why is useful precipitation often small in warm and dry areas?

Answer: Much of the precipitation that falls evaporates immediately.

Why is precipitation infiltration less effective today than in the past?

Answer:

- deforestation

- expansion of the built-up area
(urbanisation)

Precipitation and fossil water

Precipitation

Infiltration

Groundwater

Porous rock/Aquifer

Impermeable layer

Aquifer: waterhoudende laag in de ondergrond.

Sustainable water management

What do you think uses the most water?

A People who use water when showering and drinking

B Farmers who use water for crops and animals

C Hoensbroek swimming pool

D Water Show Las Vegas

The correct answer is: B

But still..

We have less and less fresh water...

https://npokennis.nl/story/632/waarom-dreigt-een-drinkwatertekort-in-nederland

Non-renewable water:

runs out

Renewable water:

doesn't run out

1. Renewable
2. Non-renewable

1. Renewable
2. Non-renewable

Water management

If you, as a country, mainly use renewable water, you are practicing sustainable water management.

Sustainable water management is:

1. Only renewable water is used.
2. Only non-renewable water is used.

HW GEO

Ex 5 and 6 from 3.2 on page 130 and 131