Comparative Analysis Of Results Obtained From 3 Indexes SEQ-Eau IBD IPS Used To Assess Water Quality Of The Berdawni A Mediterranean Stream At The Beqaa Region - Lebanon

Abstract In Lebanon for water managers the quality of water is apprehended under the only aspect of the physicochemical quality. This analysis presents some operational limit because of specific information which it brings in space and time. In this context It appeared interesting to us to carry out a study specilaized to evaluate the trophic quality of Berdawni principal affluents on right bank of Litani Mediterranean Eastern Lebanon and to take into account parallel to the chemical analyses of water and with the application of the index SEQ-Eau MEDD 26 France water agency 2003 the diatomic study of the communities of Berdawni and to analyze the various results got from the calculation of 2 biological indices I.B.D.AFNOR 2000 and I.P.S. Cemagref 1982. The comparison of the indications provided by these 3 indexes clarifies divergences sometimes important in the analysis of the quality of fesh water and made it possible to discuss the limits of their applications.