Water right in water law is the right of a user to use water from a water source, e.g., a river, stream, pond or source of groundwater. In areas with plentiful water and few users, such systems are generally not complicated or contentious. In other areas, especially arid areas where irrigation is practiced, such systems are often the source of conflict, both legal and physical. Some systems treat surface water and ground water in the same manner, while others use different principles for each.
Water rights requires consideration of the context and origin of the right being discussed, or asserted. Traditionally, water rights refers to the utilization of water as an element supporting basic human needs like drinking or irrigation. Water rights could also include the physical occupancy of waterways for purposes of travel, commerce and recreational pursuits. The legal principles and doctrines that form the basis of each type of water rights are not interchangeable and vary according to local and national laws. Therefore, variations among countries and within national subdivisions exist in discussing and acknowledging these rights.
Often, water rights are based on ownership of the land upon which the water rests or flows. For example, under English common law, any rights asserted to "moveable and wandering" water must be based upon rights to the "permanent and immovable" land below.
On streams and rivers, these are referred to as riparian rights or littoral rights, which are protected by property law. Legal principles long recognized under riparian principles involve the right to remove the water - for drinking or irrigation - or to add more water into the channel - for drainage or effluence. Under riparian law, water rights are subject to the test of "reasonable use". The judiciary has defined "reasonable use" principle as follows: "the true test of the principle and extent of the use is whether it is to the injury of the other proprietors or not.
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In the American legal system, prior appropriation water rights is the doctrine that the first person to take a quantity of water from a water source for "beneficial use" (agricultural, industrial or household) has the right to continue to use that quantity of water for that purpose. Subsequent users can take the remaining water for their own use if they do not impinge on the rights of previous users. The doctrine is sometimes summarized, "first in time, first in right".
Water scarcity (closely related to water stress or water crisis) is the lack of fresh water resources to meet the standard water demand. There are two types of water scarcity namely physical and economic water scarcity. Physical water scarcity is where there is not enough water to meet all demands, including that needed for ecosystems to function. Arid areas for example Central and West Asia, and North Africa often experience physical water scarcity.
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.
Explores water needs, consumption consequences, hydraulic economy, and soil salinization, emphasizing the impact of water withdrawals and the quality of drinking water.
Explores water resources engineering, global water reserves, virtual water trade, historical water management, water scarcity impact, and future challenges.
Modernism has instilled within us a fear for leaks, consequently fostering a desire for a hygienic, comfortable, and
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