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Unit 1 Dynamic Planet Revision. Topic 4: Waterworld. What you need to know. The hydrological cycle Why some areas have unreliable water supply How too little or too much water affects people How humans affect water quality and quantity How climate change affects the water cycle

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what you need to know
What you need to know
  • The hydrological cycle
  • Why some areas have unreliable water supply
  • How too little or too much water affects people
  • How humans affect water quality and quantity
  • How climate change affects the water cycle
  • Large scale water management example
  • Intermediate technology water management example
the hydrological cycle
The Hydrological Cycle
  • As you watch the clips, write down at least 3 key words from each clip.
  • Clip links:
  • http://www.bbc.co.uk/learningzone/clips/the-water-cycle/2148.html
  • http://www.bbc.co.uk/learningzone/clips/the-hydrological-cycle/406.html
which words did you get
Which words did you get?
  • Precipitation
  • Evaporation
  • Interception
  • Surface runoff
  • Percolation
  • Throughflow
  • Infiltration
  • Groundwater flow
  • Storage
  • Evaporate
  • Water vapour
  • Condenses
  • Droplets

Practice Question (2 mins, 4 lines to write): The diagram shows the hydrological cycle. State how 2 processes will be affected if there is a long, hot and dry summer. (2 marks)

possible answers for 2 marks you need 2 correct statements
Possible answers (For 2 marks you need 2 correct statements)
  • There will be more evaporation
  • There will be less precipitation
  • There will be less percolation
  • There will be less throughflow
  • etc
comparing climates
Comparing climates
  • How is rainfall shown?
  • How is temperature shown?
  • Compare the climate graphs

(similarities and differences)

What biomes would you

expect to find in these


reasons for an unreliable water supply
Reasons for an unreliable water supply

In a table with “economic”, “social” and “environmental” headings, put the following statements in the correct column.

  • Unreliable rainfall
  • Increasing population (migration or natural change)
  • Agricultural demand (for crops etc)
  • Pollution from agriculture and factories
  • Rising living standards (more showers, dishwashers…)
  • Climate change affecting rainfall patterns

Ex: Which of these affects water quality rather than quantity?

you must know the difference
You must know the difference:


Demand > availability eg SW USA

ECONOMIC WATER SCARCITY = supply available but people can’t afford to exploit them. Lack of money to build storage facilities or distribute water eg Sahel

economic water scarcity case study the sahel
Economic Water Scarcity Case Study: The Sahel


Write the title

and describe

the location

of the Sahel.

fill in the table as you watch these clips
Fill in the table as you watch these clips.
  • http://www.bbc.co.uk/learningzone/clips/expansion-of-the-sahara-desert/1500.html
  • http://www.bbc.co.uk/learningzone/clips/burkina-faso-local-impact-of-desertification/4323.html
fill in the table as you watch these clips1
Fill in the table as you watch these clips
  • http://www.bbc.co.uk/learningzone/clips/the-sonoran-desert-under-threat/3098.html
  • http://www.bbc.co.uk/learningzone/clips/the-sonoran-desert-over-extraction-of-water/3099.html
practice question
Practice Question
  • Explain some social and economic effects of water scarcity. (4 marks)
water management large scale example
Water Management – Large Scale Example
  • Large Scale: top-down project, expensive, big impacts on people, economy environment (good and bad)
dam example katse dam lesotho
Dam example: Katse Dam, Lesotho

1. Watch the clip writing at least 2 advantages and 2 disadvantages.

  • http://www.bbc.co.uk/learningzone/clips/the-advantages-and-disadvantages-of-dams/539.html

2. Are your (dis)advantages social, economic or environmental?

water management intermediate technology example
Water Management – Intermediate Technology Example
  • Intermediate technology = cheap, suits the local climate, landscape people, easily repaired, local people involved.
intermediate technology playpumps south africa
Intermediate Technology: Playpumps, South Africa
  • http://www.youtube.com/user/1difference#p/search/19/mAfuKPItFQw
  • What is the scheme?
  • What are its advantages and disadvantages?
practice question1
Practice Question

a) Use the diagram to state two humans cause water scarcity through pollution. (2 marks)

b) Explain ways people can overcome water scarcity. (4 marks)