flow of the river. International law prevents that kind of threatening.
Much of that river flows IN England--its outlet to the sea winds through that green and pleasant land.
Trying to play the 'water politics' game is a nonstarter. It is as silly as the Germans trying to strongarm the Bulgarians (to say nothing of the Austrians, Hungarians, Romanians, etc.) over water rights to the Danube. Just because the river BEGINS in your land does not mean you can cut off the supply--that's not how these things work. See the Berlin Rules for additional insight:
https://en.wikipedia.org/wiki/Berlin_Rules_on_Water_Resources
The document requires that nations take appropriate steps to sustain and manage water resources, in conjunction with other resources, and minimize environmental harm. In addition to setting out various regulations for nations to follow with respect to water within their boundaries and water they may share, it regulates behavior in wartime, including damage to water installations such as dams and dikes. Nations are not permitted to take action that may result in a shortage of life-sustaining water for civilians, unless a nation being invaded is compelled by military emergency to disable its own water supply, or that may cause undue ecological damage. Poisoning water necessary for survival is in all cases forbidden.
Where water resources are internationally shared, it regulates equitable use with reasonable consideration of such factors as past customary usages of the resource and balancing variant needs and demands of all bordering nations. It mandates that the first consideration in weighing needs is satisfying the requirements of human beings for water to sustain life. It requires that nations sharing water make reasonable efforts not to cause harm to one another by the ways in which the water is used. It permits free navigation by all nations sharing a water system, although it allows reasonable restriction by a nation of water navigation within its jurisdiction for security. Nations are expected to work together as needed to sustain shared water resources.
The document requires a reasonable openness to the international community of information related to water resources and their usage, particularly in those cases where nations sharing a water resource may be impacted. Except in cases of emergency, usage that may significantly impact others should be discussed in advance with all interested nations, with disagreements resolved by appeal as necessary to international governing committees.
Regardless of the location of water, and whether or not a water resource is shared, it asserts the right of every individual to equally access water to sustain life without discrimination, even in times of war. It requires states to enable their citizens to participate in decisions affecting water access by providing reasonable information about the water resource and plans impacting it. It also mandates the compensation of those who are displaced in the interests of securing water preservation. It requires that nations be mindful of the environmental factors that affect water resources and preserve them appropriately, such as by preventing water pollution and preserving native ecosystems, even if they are occupying foreign territory during a time of war. It requires appropriate measures to address flooding and drought, both in communicating quickly about these to nations sharing a water resource and in working to eliminate or prevent harm to a water resource and the population dependent on it.
The Berlin Rules on Water Resources provides that nations must enforce its provisions through local legislation and also submit to international review as necessary to ensure that they are compliant.
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