Temporal evaluation of the Beni Haroun dam's (Algeria) raw water quality, through a literature review.

Several authors have carried out physico-chemical analyses of the raw water of Beni Haroun dam, since its exploitation, and others continue to do so. In this work, we have presented a synthesis of 16 years (2003-2018). The temporal variation of their quality depends on several parameters, such as climate, socio-economic development and population growth around its tributaries. The elements studied are: pH, EC, TDS, and in (mg/l) Ca++ , Mg++ ,Na+ , K+ , Cl- , SO42- , HCO3- , NO3- , NO2- ,NH4+ and PO43- , as well as organic parameters such as: COD, BOD5 , dissolved O2 and some heavy metals (μg/l) : Pb, Cd, Zn, Fe, Cr, Cu and Mn. The results of this publications collection allows us to note that the Beni Haroun dam raw water presents a variable quality in time, according to the seasons, and mainly the hydric contribution resulting from the precipitation, which induces a dilution of the various chemical elements. The air temperature modifies that of water, which affects the modification of the biological parameters. The conclusion common to all authors is the obligation to undergo a preliminary treatment, to this raw water, before its use for consumption and irrigation.