16 terms

GCSE Water resources - supply and demand

STUDY
PLAY
2.5%
of the water on Earth is freshwater
Water resources
Sources of water that are useful or potentially useful to humans
Water supply
A river, stream, aquifer, reservoir or spring with fresh water
Water demand
The amount of water needed for household, industrial and agricultural use in an area
79%
Of all freshwater is locked up as ice in ice sheets and glaciers
20%
Of all freshwater is groundwater, foudnin underground aquifers
Aquifers
Subterranean, porous, water-holding rocks that provide millions of wells with steady flows of water.
Water cycle
The continuous process by which water moves from Earth's surface to the atmosphere and back
Water surplus
This exists where water supply is greater than demand.
Water deficit
This exists where water demand is greater than supply.
Physical water scarcity
where natural water resources are near or have exceeded sustainable levels
Economic water scarcity
when a population does not have the necessary monetary means or technology to utilise an adequate source of water.
Reservoirs
a large natural or artificial lake used as a source of water supply.
Water quality
can be measured in terms of the chemical, physical, and biological content of water.
Water stress
occurs when the demand for water exceeds the available amount during a certain period or when poor quality restricts its use.
LICs
Tend to suffer the worst economic water shortages