Qualitative changes Trend (in terms of sedimentation and corrosion) in drinking water of three villages of Sarbandan, Jaban and Ayinehvarzan, in Damavand area

An intensive decrease has been occurred in discharge of drinking waters in some of villages of Damavand city which caused dramatical changes in quality and quantity drinking water of these wells. This research tries to study probable qualitative changes in these resources, as well as evaluating role of qualitative condition of water in reduction of its quantity. According to the conducted studies, reduction in quantity of wells of the villages can be attributed to two reasons: 1. Tectonic factors and geology of the region; 2. Chemical factor. Geological and tectonic studies revealed that tectonic factors had no effect on reduced discharge and quality, because tectonic functions linearly, while this was a point event. Therefore, it is more likely that there is arelation between changes in quality and chemical factors and conditions. Finally, based on physical and chemical analysis of water samples and calculation of Langelier’s index and Rayzanar’s index on one hand, and study of geological formations, especially sequences of sediments in north of the region, with most frequent facies being chile followed by carbonated, dolomite facies, on the other hand. it can be said that water of studied wells make sediments. Therefore, study of hydrochemical conditions of groundwater of the studied zone, persistent monitoring of ground water, videometery of wells, persistent discharge measurement, and identification of sediment of pipe wall are recommended. Also, application of proper methods such as waterjet, ultrasound, acid pickling, and magnetic air shock (separately, or in hybrid manner) results in dissolution of sediments formed on the wall of well.