Clean Fresh Water A Limited Replenishable Resource Darlene 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 Earths 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.

Water Activity 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?

The sun drives the water cycle

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

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: Irrigation for agriculture Industry Domestic use Irrigation for agriculture Industry Domestic use

Agricultural Use 70% 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)

Irrigation

Pollution from Agricultural runoff

Agricultural runoff

Industrial water pollution

Domestic use in MEDCs

Water Pollution Human waste: sewage

Domestic Use The average American uses 176 gallons of water per day compared to 5 gallons of water the average African family uses each day. (

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 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

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