Important water scarcity terms
It is the absence of (lack of) water, or inadequate safe water in any geographic area for humans, animal, and environmental use. In many places, there may be water (fresh flowing water) not far off, but there are simply very few resources (money and ability) to bring it home. That is called economic water scarcity. On the other hand, there could be physical scarcity, which means there is no water at all (or just not enough).
It is usually confused with water scarcity. In a way, water stress is the result of scarcity in the sense that the water demand far exceeds the available amount. That causes deterioration of freshwater and results in a drought.
Potable water is water that is considered safe enough for human consumption with little risk of short and long-term harm. It is usually known as wholesome water. Water can be called wholesome only after experts test and confirm that the water complies with specific standards set by the authorities.
Irrigation is the application of water to crop farms to provide the plants with water to grow. Irrigation can increase yields of most crops by 100 to 400%. Farmers who switch from surface irrigation to localized irrigation can cut their water use by 30 to 60%. FAO
These are diseases that are transmitted by drinking contaminated water. Examples of such diseases include Typhoid fever, Malaria, Hepatitis A, Cholera, Bacillary Dysentery/Shigellosis.
That is water that has higher salt content, but not as high as seawater. This kind of water is often found where freshwater meets seawater (estuaries, deltas, and mangrove swamps). Usually, brackish water has less living organisms in it.
Beneath the earth’s surface are rocks. Some of these rocks are porous and permeable and allow water and gases to flow through them freely. These water-bearing rocks are called aquifers. Water from aquifers tends to be very pure if not exposed to soil pollution.
The portion of water that is withdrawn from a source that is no longer available to be returned to that water source, in the sense that it was completely used up or has evaporated.
The portion of water that is removed from the ground, or diverted from a surface water source, such as a river or lake.