North-east Algeria benefits from a Mediterranean and semi-arid climate. The surface water resource is a factor restricting the economic development of the country. Within the framework of the National Water
Plan, we studied the quantity of water that can be mobilized on several dozens of dam sites. A first hypothesis would be to base the simulations on the rainfall recorded during the last 40 years which were relatively dry. A second hypothesis would consist of assuming a reduction of about 15% in rainfall as the work of IPCC would suggest. This 15% reduction
would in turn generate a reduction of approximately 40% of surface water resources. Such a decrease would thus drive a rather profound review in the programming of the works regarding the storage and transfer of water.