Study of the physico-chemical and bacteriological quality of the barrage hassan addakhil of errachidia (Morocco) [Étude de la qualité physico-chimique et bactériologique des eaux du barrage hassan addakhil d'errachidia (Maroc)]

The hassan addakhil dam is situated in the foothills of the central high atlas. it constitutes an important unit in the region of errachidia. the flowing waters from the dam allow the irrigation of agricultural lands of the ziz valley and the tafilalet plains.the objective of the present study is to evaluate the current status of the bacteriological and physicochemical waters' quality of the hassan addakhil dam. it also aims at identifying the effects of the pollution of the hassan addakhil dam and the ziz valley's waters and its point source. to properly conduct this work,we carried out a study to evaluate the physicochemical and bacteriological parameters of the hassan addakhil dam waters and those of the ziz valley. the latter feeds the former during the year of 2012,from january to december,at four stations chosen from the upstream towards the downstream of the dam. the results showed that the physico-chemical water quality of the dam is influenced by the lithology of the ziz basin as well as the climatic factors (precipitation and temperatures). this study revealed the presence of fecal contamination in the hassan addakhil dam and the ziz valley's waters. the degree of the fecal contamination of the hassan addakhil dam waters is lowers than that of the ziz valley's,but still may constitute a health risk. a principal component analysis (acp) was applied to the physico-chemical and biological variables,and revealed the existence of correlations between the physico-chemical and bacteriological parameters.