Abstract—In Morocco, superficial flows are dependent on rainfall and exhibit high spatial variability. In general, the water resources available to Morocco are limited and subject to extreme cyclical variations. Similarly, the qualitative situation of the waters is far from satisfactory. Indeed, population growth accompanied by rapid urbanization that causes many disturbances to natural environments. Industrialization, the irrational use of fertilizers and pesticides and the lack of awareness of the population towards the protection of the environment, lead as much to an imbalance of the ecosystem and generate polluting elements that can affect the physico-chemical quality biological and aquatic environments, but also alter the uses of water; water collection, swimming … etc. The sub-basin of OuedSebou drains the Mehdia region and is particularly affected by the problem of continuous development of the agricultural sector. Indeed, the discharges of water-gardens, pesticides and fertilizers drained by rainwater and irrigation and dirt environment, in addition to the domestic discharges generated by the small town Mehdia and the city of Kenitra are dumped directly into the OuedSebou. The present research on the Mehdia region is aimed at the prospection of the hydrobiology of the waters of the Sebouwadi. The study will be based on physicochemical analysis of the mouth of Mehdia and the determination of seasonal fluctuations of these parameters between the low water period and the flood period.
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