CHONG BOON SECONDARY SCHOOLLower Sec Geography

Secondary Two

Unit 14 : Responses to the rising demand for water

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Thinking Questions

1.Can there be more water elsewhere for us to use?

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Unit Objectives

1.Evaluate the effectiveness of the different response to the rising demand for water.

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3 responses to the rising demand for water1. Increasing the price of

water

2. Increasing water supply

3. Introducing water conservation programmes

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Increasing the price of water• Water price directly affect water usage.• Higher price = lower unnecessary usage

• Do you still wash your car every week?• Do you still wash your house every week?• Do you still bathe?

• Water price has an impact on the very poor.• Water price has to be decided by the government together with the water companies.

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Increasing the water supply• Managing Catchment areas

• Increasing the water captured in catchment areas• Dams create water reservoirs.• Increased human activity in the catchment areas lead

to pollution of water supplies.

• International agreements• Agreements to protect water bodies that are shared

• All countries / states that share the water are to equally protect and care for the water supply

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• Desalination• Removal of salts and other impurities from saltwater.

• Normally involves boiling and condensing the water vapour

• Expensive as it needs substantial heat.

• Desalination (Singapore)• Reverse Osmosis • Similar method as NEWater.• Costs higher than making NEWater• Costs lower than traditional desalination (use of heat)

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Increasing the water supply

•Water reclamation•The treatment of wastewater for reuse.

•Wastewater is purified by different treatment methods.

•Normally the recycled water is pumped into existing water bodies to blend in and is used again.

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Water Conservation

•Using education to encourage people to use less water.

•Teach the population that water is a precious commodity and to minimise unnecessary use.

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Water Conservation (at home) pg126• Toilet

• Half flush and full flush system

• Bathroom• Washing hands and brushing teeth

• Kitchen• Washing of vegetables• Dishwashers

• Shower• Short showers• Low-flow showerhead

• Laundry• Wash only full load

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Let’s do a recap exercise

•Complete the exercise in 10 minutes

•Good Luck!•You can use your notes if you need help.