ارزیابی کیفیت آب رودخانه برای مصارف شرب و کشاورزی (مطالعه موردی: رودخانه جاجرود، حوزه آبخیز لتیان)

From the beginning of human life due to the need for water living, streams and waters are considered. For use of water resources, agriculture, urban and industrial centers, and general civilization formed near rivers. But with the rise of industry and technology, man has begun to destroy nature. In surface water due to population growth and the proliferation of pollution, quality of rivers and aquifers becomes more difficult every day. The spatial and temporal variations of water quality in rivers as the main source of surface water, always a challenge for managers and decision-makers in the area of water resources. In this study the water quality of the main branch in Jajrood River in Shemshak _ Darbandsar terms of agriculture and drinking consumption has been studied. 5 samples were taken from the source to the output Jirood village. The concentration of major anions and cations were measured according to standard methods. The chemical composition of the samples using the graphical diagrams Wilcox and Schoeller were analyzed. Based on the results obtained with samples drawn on charts Wilcox and Schoeller also became apparent that water drinking Jajrood generally not suitable for use, but considering the amount of salt and sodium content of the water river used for irrigation of agricultural land use.