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25 Cards in this Set

  • Front
  • Back

Source of the Colorado River water

Snow melt in the Rocky Mountains

Percentage of the Earth covered by water

71%

Percentage of the Earth's water supply that is liquid water

0.024%

Water Hotspot

An area with high competition for scarce water resources

Water table

Moves down in dry weather and up in wet weather

Zone of saturation

The area where the spaces in the soil and rock are completely filled with water

Aquifer

A geological layer consisting of underground caverns and porous layers of sand, gravel, or bedrock that trap groundwater

Watershed

The land from which surface water drains into a particular lake, river, or other body of water

The majority of freshwater withdrawn is for

Agriculture

Virtual Water

Indirectly used water, used to produce food and other products

The percentage of China's major cities are already facing water shortages

67%

Subsidence

The land above an aquifer sinks due to overdrafting

Reverse osmosis

A method of desalination that involves using high pressure to force saltwater through a membrane filter with pores small enough to remove salt

Distillation

A method of desalination that involves heating saltwater until it evaporates, leaving salt behind

Saltwater intrusion

Overdrafting an aquifer to the point that salt water is pulled into the freshwater aquifer from local wetlands

Advantages of dams and reservoirs

Produce electricity, supply water for irrigation, provide recreational areas, and reduce downstream flooding

Disadvantages of dams and reservoirs

Displaces people, disrupts migration patterns, reduces nutrients downstream and water loss through evaporation

California Water Project

The world's largest water transfer project

Colorado River Basin

Supplies water to the driest states in the US.

Gravity Flow Irrigation

Unlined ditches are flooded with water which is absorbed by soil and crops

Drip Irrigation

The most efficient means of water delivery to crops

Center Pivot Irrigation

Uses pumps to spray water directly onto crops

Flood prevention

Conserve and restore wetlands

Major cause of flooding

Destroying vegetation

Aral Sea

A water transfer project gone wrong, resulting in high saline water, decreased biodiversity, and water shortages