OBJECTIVE HYDROSPHERE

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Presentation transcript:

OBJECTIVE 3 HYDROSPHERE ESSENTIAL QUESTIONS HOW CAN WATER SUPPLY BE SUSTAINED? WHAT ARE THE ENVIRONMENTAL CONSEQUENCES OF THE ARTIFICIAL STORAGE OF WATER?

Some precipitation infiltrates the ground and is stored in soil and rock (groundwater). Water that does not sink into the ground or evaporate into the air runs off (surface runoff) into bodies of water. The land from which the surface water drains into a body of water is called its watershed or drainage basin.

DISPARITIES IN WATER RESOURCES We currently use more than half of the world’s reliable runoff of surface water and could be using 70-90% by 2025. About 70% of the water we withdraw from rivers, lakes, and aquifers is not returned to these sources. Irrigation is the biggest user of water (70%), followed by industries (20%) and cities and residences (10%).