Evaluation and evolution of the quality of the water resources in the distribution network

The aim of the present study is to bring in our modest contribution in evaluating the water state in the sources that feed Constantine city. For the purpose of quality determination, analyses based on the measure of some physico-chemical and bacteriological parameters have been realized on samples taken from the three principal drinking water sources: Hamma, Boumerzoug (underground waters) and Hammam Grouz stopping (surface waters). These analyses revealed a good chemical quality of the water but some microbiological degradation. We have then examined the water quality evolution all along the distribution network as well as its evolution throughout the seasons. This allowed us to determine the two principal causes for the observed intermittent contaminations: infiltrations that occur through out the defections existing on the distribution network and quality of the distributed water.

Fig. 22. Evolution space–time of total coliformes in the network distribution feed by the Hammam Grouz stopping. Knowing that the enumeration of the total coliformes has value that for treated water, we have had to announce for the network supplied with Boumerzoug the presence of total coliformes to the level of faculty more than of fecal coliformes. It should be noted also the absence of fecal streptococcus for water of Hamma (Figs. 20 and 21). We noted concerning water of the Hammam Grouz stopping that the raw waters of this last presents a water contaminated by the total coliformes, fecal coliformes and fecal streptococcus. In fact, once the water is treated the total coliformes override the two other species.