The river Hamma near the city Sidi Slimane, tributary of the river R'dom . It is fed by a set of freshwater sources upstream in the Outita pre-Riparian ride. presents non-permanent flows during the three months February, March and April of the year 2017. The descriptive analysis showed that the waters of the Oued are subjected to physicochemical variations important after mixing with those of the source: enrichment with mineral salts (chlorides and sulfates) and the increase of temperature, conductivity and total hardness of water.