trend assessment of changes in water quality plain eyvanakey

the trend of changes in water quality plain eyvanakey to manage shared water resources is necessary semnan and tehranprovince.for this purpose after determining the study range in the eyvanekey area, field investigation was performed to identify the geological formations and the distribution there of as well as the faults and salt domes locations using existing geological maps. afterwards through identifying the wells location and using decomposition results of the area water samples, the concentration contour maps of chloride, sulfate, sodium, etc. were plotted.the faults' performance and the plotted maps' interpretation showed that the highest salinity concentration lied in the eastern and southern parts of the plain and their change trend occurred in highlands towards central and western parts of the study range, consistent with the main river path.the waters of bicarbonate and magnesium ions have the situation better than the other. best and worst water quality in the western regions in eastern and southern regions that are close to evaporate mass is located.wilcox diagram was determined and show the eastern and southern areas are in the worst category wilcox. in terms of agriculture, not suitable water has a salinity and electrical conductivity less central plains, which are more desirable for agriculture