Clean Fresh Water A Limited Replenishable

Resource

Clean Fresh Water A Limited Replenishable

ResourceDarlene OehlkeDarlene Oehlke

From a distance, the Earth is a blue planet.

70% of the surface is covered with water.

From a distance, the Earth is a blue planet.

70% of the surface is covered with water.

97% of the Earth’s water is salt water

Less than 3% is fresh water

66% of all fresh water is trapped in glaciers, icebergs,

snow

Less than 1% of the fresh water is available for human

use

97% of the Earth’s water is salt water

Less than 3% is fresh water

66% of all fresh water is trapped in glaciers, icebergs,

snow

Less than 1% of the fresh water is available for human

use

97% of the water on the planet is salt water.

97% of the water on the planet is salt water.

Water ActivityWater Activity Using the

glassware given and 1000 mLs of water, make a short demonstration to model the stocks of water on Earth.

Using the glassware given and 1000 mLs of water, make a short demonstration to model the stocks of water on Earth.

Where is the water?Where is the water?

The sun drives the water cycle

The sun drives the water cycle

The sun evaporates water from the ocean, the water condenses, winds bring the clouds over land…

The sun evaporates water from the ocean, the water condenses, winds bring the clouds over land…

Water cycle review activity

Water cycle review activity

Complete the diagram of the water cycle showing the following stocks: ocean, surface water, ground water (including aquifers), ice and snow.

Label the flows: precipitation, infiltration, runoff, evaporation, condensation, discharge, melting, freezing

Complete the diagram of the water cycle showing the following stocks: ocean, surface water, ground water (including aquifers), ice and snow.

Label the flows: precipitation, infiltration, runoff, evaporation, condensation, discharge, melting, freezing

Three categories of water use:Three categories of water use:

Irrigation for agricultureIndustryDomestic use

Irrigation for agricultureIndustryDomestic use

Agricultural UseAgricultural Use70% of fresh water

use is for irrigation - Much is wasted

Standard irrigation (50% gets to roots and 50% is wasted)

70% of fresh water use is for irrigation - Much is wasted

Standard irrigation (50% gets to roots and 50% is wasted)

IrrigationIrrigation

Pollution from Agricultural runoff

Pollution from Agricultural runoff

Agricultural runoff

Agricultural runoff

Industrial water pollution

Industrial water pollution

Domestic use in MEDC’sDomestic use in MEDC’s

Water PollutionWater PollutionHuman waste: sewageHuman waste: sewage

Domestic UseDomestic Use

The average American uses 176 gallons of water per day compared to 5 gallons of water the average African family uses each day. (www.water.org)

The average American uses 176 gallons of water per day compared to 5 gallons of water the average African family uses each day. (www.water.org)

Two ways to solve a water crisis

Two ways to solve a water crisis

Increase supply of water

Decrease the demand of water

Increase supply of water

Decrease the demand of water

Ways to increase supplyWays to increase supply

Ways to increase the supply

Ways to increase the supply

Desalinate salt water, in cities near the ocean.

Transport water from areas that have a lot of water.

Purify waste waters and reused Harvest rain water Harvest fog (Northern Chile) Treat sewage and industrial waste

Desalinate salt water, in cities near the ocean.

Transport water from areas that have a lot of water.

Purify waste waters and reused Harvest rain water Harvest fog (Northern Chile) Treat sewage and industrial waste

Ways to decrease the demand of water

Ways to decrease the demand of water

Ways to decrease the demand of water

Ways to decrease the demand of water

Use efficient irrigation systems Charge more money for water Fix the plumbing in your house Teach people to use less water Fix leaking pipes in public water

systems

Use efficient irrigation systems Charge more money for water Fix the plumbing in your house Teach people to use less water Fix leaking pipes in public water

systems