The Environmental Discrepancy and the water Problem in the Semi – Arid and Arid Regions ( The Algerian Sample

Abstract

Water is considered as a scarce and strategic wealth on the territorial and local scale. This necessitates and requires scientific knowledge about the effective use in the exploitation of water resources that are available. The geography of Algeria is characterized by an environmental diversity: northern cool or humid climate, a varying green cover to the high hills’ inland areas where exists the dry or near arid climate and the southern desert (arid) climate in the Sahara .this natural gift has imposed on the Algeria government making different national projects which aim at transferring waters from the north toward the inland towns (the big water transfers’ programmes) in order to provide the inhabitants with drinkable waters, also irrigate vast areas and preservethe national territorial balance .These programmes are supposed to correct the natural differences in the distribution of waters’ resources to face the natural and economical challenges in the supply of food that can fulfill the increasing needs of the inhabitants. The Algerian experience cannot be a unique sample since it is submitted to the economical and natural circumstances of the country.But the assessing level of the experience appears in the global vision of the use (management) of waters the various choices in the sources of waters energy whether they are renewable or non- renewable and the follow up of the ecological impacts that result from the exploitation of the materials.