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Water security
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The aim of water security is to make the most of water's benefits for humans and ecosystems. The second aim is to limit the risks of destructive impacts of water to an acceptable level. These risks include for example too much water (flood), too little water or poor quality (polluted) water. People who live with a high level of water security always have access to "an acceptable quantity and quality of water for health, livelihoods and production". For example, access to water, sanitation and hygiene services is one part of water security. Some organizations use the term water security more narrowly for water supply aspects only.
Ethiopia's move to fill the dam's reservoir could reduce Nile flows by as much as 25% and devastate Egyptian farmlands.
Ethiopia's move to fill the dam's reservoir could reduce Nile flows by as much as 25% and devastate Egyptian farmlands.
Drinking water quality framework: Environment (including weather events), infrastructure and management affect drinking water quality at the point of
Drinking water quality framework: Environment (including weather events), infrastructure and management affect drinking water quality at the point of collection (PoC) and point of use (PoU).
Flooded roads in Ponce, Puerto Rico, a week after Hurricane Maria devastated the island (2017).
Flooded roads in Ponce, Puerto Rico, a week after Hurricane Maria devastated the island (2017).
Annual rainfall pattern in two regions of Ethiopia. The lines represent observations (red dashed line) and model results (green line) in a climate mod
Annual rainfall pattern in two regions of Ethiopia. The lines represent observations (red dashed line) and model results (green line) in a climate model study of the region.
Water resources
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Water resources are natural resources of water that are potentially useful for humans, for example as a source of drinking water supply or irrigation water. 97% of the water on Earth is salt water and only three percent is fresh water; slightly over two-thirds of this is frozen in glaciers and polar ice caps. The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction present above ground or in the air. Natural sources of fresh water include surface water, under river flow, groundwater and frozen water. Non-natural or human-made sources of fresh water can include wastewater that has been treated for reuse options, and desalinated seawater. People use water resources for agricultural, industrial and household activities.
Lake Chungará and Parinacota volcano in northern Chile
Lake Chungará and Parinacota volcano in northern Chile
Panorama of a natural wetland (Sinclair Wetlands, New Zealand)
Panorama of a natural wetland (Sinclair Wetlands, New Zealand)
Total renewable freshwater resources of the world, in mm/year (1 mm is equivalent to 1 L of water per m2) (long-term average for the years 1961–1990).
Total renewable freshwater resources of the world, in mm/year (1 mm is equivalent to 1 L of water per m2) (long-term average for the years 1961–1990). Resolution is 0.5° longitude x 0.5° latitude (equivalent to 55 km x 55 km at the equator). Computed by the global freshwater model WaterGAP.
Irrigation of agricultural fields in Andalusia, Spain. Irrigation canal on the left.
Irrigation of agricultural fields in Andalusia, Spain. Irrigation canal on the left.