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Water Resource Management

Changing water supply and demand

  • 3 things to know
  • Paper 2 section C

Overview

How population growth, living standards, irrigation and industry have raised demand, how dams, boreholes and transfer schemes have raised supply, how over-abstraction, pollution and deforestation reduce it, and how population projections compare with the fresh water available per person.

What you need to know

Answer each one before you reveal it.

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Key term

How have population growth, living standards, irrigation and powered pumps changed water demand and supply over fifty years?

Key term

How has population growth affected the demand for water over the last fifty years?

Key term

How have rising living standards increased how much water each household uses?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    How has population growth affected the demand for water over the last fifty years?

    Model answer

    Far more people need drinking water, food and sanitation, so total demand has risen steeply even where use per person has not.

  2. 2

    How have rising living standards increased how much water each household uses?

    Model answer

    Homes now have flush toilets, showers, washing machines and dishwashers, and many have gardens and cars to wash.

  3. 3

    Why has farming pushed water demand up in recent decades?

    Model answer

    More land has been put under irrigation to feed a growing population, and irrigation is by far the thirstiest use of water.

  4. 4

    How has industrial growth changed the demand for water?

    Model answer

    Manufacturing needs water for processing and cleaning, and power stations use huge volumes for cooling.

  5. 5

    How do dams and reservoirs increase the water supply available to people?

    Model answer

    They store river water through wet periods so that a steady, reliable amount can be released when it is needed.

  6. 6

    How have wells and boreholes changed supply?

    Model answer

    Powered pumps allow groundwater to be lifted from deep aquifers, opening up supplies that hand-dug wells could never reach.

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