Tag: world

In addition, some other are not independent. Unlike static raw materials, water reserves do not escape the dynamics of the water cycle, because as mentioned involved in the regulation of flows. Therefore, exploitation of a reservation status and result horn disrupt the general circulation of the waters “Interrupt the flow, which can occur in several ways. Exploitable water reserves and deposits are a priori those which are relatively little involved in the current water cycle, just connected to the active circulation systems, hydrographic networks, “it excludes the majority of lakes and groundwater bags shallow closely linked to surface watercourses. Lake Baikal, for example, has the honor of being the largest reservoir of fresh surface water on the planet (23.1012 m3) and is not in any case of a nonrenewable resource, since its removal would first permanent removal 60 109 m3/year flow through it (bypassing his emissary, the Angara).

And the same is true for all freshwater lakes in the world related to these systems. The management of non-renewable water reserves raises issues that seem only partly to the management of other reserves of mineral raw materials. Beginning with the opportunity to exploit deliberately (and not just unintentionally) these reserves to the detriment of the catchment flows indefinitely renewed only, this has been questioned. The American professor asked WC Walton in 1970 in a manual chair that has sat: (14) “It’s a real problem of development and management in arid areas. “Water must be extracted maximum benefit of the present generation, in the same way that the minerals and other nonrenewable resources, or pumping should be limited to the perpetually renewed negligible quantity?” Others have replicated under a productivist optical short term, there is no reason to stop using a “water capital” as it does not exist for other sources of raw materials, if their exploitation is economically as profitable following the criteria of its users. In fact, these farms have been developed in several countries already mentioned (see Table l), where are the forms of water production more profitable. In Texas, for example, between 1900 and 1980 is taken about a quarter of the total reserve of the High Plains aquifer, which has led to a decrease in the level which exceeds sixty feet.

Annually extracted even six billion cubic meters (eighties) and the remaining exploitable reserves would be 245 billion cubic meters in 1990, giving about forty years of production at current rates in any case, the use of resources non-renewable water offered by the major aquifers in different countries, which has acquired a strong push during this century, probably will end twenty-first century will have been only a moment in the history of water use for humanity. Some billions of cubic meters of water are to be removed in an irreversible manner, if majority-of the lithosphere