The availability of useful water fell sharply in the Grand Sousse (Tunisia Sahel), due to the rapidly changing patterns of production and consumption, one of the main events was the explosion of the water resources consumption. This increase in strictly biological demand goes hand in hand with the demand for irrigated agriculture and urban uses (domestic, industrial and tourism). The present work aims to identify the different types of users competing for the same resource, and their location in the same space delicate coastline and more fragile. So this is both a diachronic study based on a prior bibliographic research, particularly on progress reports providing information on trends in the main sectors addressed (population, tourism, industry, agriculture). Furthermore, the study has focused on the evolution of water demand for these same sectors, through the acquisition of a water consumption of the database by type of users and mapping of such data. This is in particular the development of thematic maps, through a geographic information system, which has contributed significantly to illustrate these spatial dynamics and conflicts of uses, while highlighting the challenges in the management and Sectoral allocation of water resources.