Trend Analysis of Chemical Water Quality Parameters;Case study Cham Anjir River

Surface waters، especially rivers are important sources of water for drinking and farming. Cham Anjir river is a main water resource in Lorestan province. The main purpose of this study was assessment of water quality parameters and routing using graphical methods such as Wilcox، Schoeller and Piper Diagram. Quality and quantity data (1968 - 2010 Cham Anjir station) were analyzed. According to Piper diagram، type of water quality was in calcium-magnesium range. Schoeller diagram showed that all water samples are in potable and acceptable class. Result of chemical water quality analyze by Wilcox Diagram showed that the most samples are located in low salinity class (c2s1) that are suitable for farming. Menn-Kendal test was used for water quality routing. According to results، pH and discharge decreased consequently، acidity of the water increased. A significant increase in other parameters has been observed (such as: Electrical conductivity، bicarbonate، chlorine، calcium، magnesium، residual salts، total anions، total hardness and temporary hardness). Uptrend of water dissolved salts show a reduction in water quality and an increase in soluble salts.