Impact Des Rejets De Margines Sur La Qualité Des Eaux Du Nahr Hasbani (sud Liban) Par Référence Spéciale Aux Indices Diatomiques

The sustainable development in Lebanon is highly related to the existence of water resources. However, these resources seemed to be insufficient in the past few years. This is due in part to the demographic growth and the development of agriculture and industrial sectors in the country. The south east of Lebanon is known as the region the least irrigated. The main water resource of this region is the Hasbani River (Nahr Hasbani) beside small limited springs. Olive culture occupies an important place in the agriculture sector of the South. However the rejection of olive margins in the Nahr Hasbani deteriorated the water quality, especially at winter time.In this study 124 algal species identified during spring and summer were shown to be characteristic of oligotrophic water. 85 % of these species were identified as diatoms. The use of diatom indices confirmed the river eutrophication by excessive proliferation of Nitzschia palea and Gomphonema parvulum.