Determination of Physical & Chemical Properties of Water of Khersan River & Investigation on Its Yearly Changes

Rivers are one of the most important water resources with a wide scope of applications. On the other hand, any entrance of polluting items into rivers may cause different physical and chemical changes. Therefore it is necessary to have a good knowledge of these parameters and changing process of them. Meanwhile Khersan River is one of the greatest headbranch of Karoon as the most important of State’s rivers. This is due to supplying of major part of required water for civil, rural, agricultural purposes. The present paper intends to specify any physical and chemical parameters of Khersan River (including Nitrate, Phosphate, Liquid oxygen, Biochemical Oxygen demand, Temperature & pH). It is accompanied with a study of annual changes of it. Since there was not a real research on Khersan River with such dimensions, therefore it could be useful in the field of different applications most of which is dam construction on the concerned river. In order to perform some physical and chemical tests, we performed 12 steps of sampling on monthly basis. All water samples belonged to 6 stations through the river way. We applied standard sampling method and test procedures. Findings and According to the findings, there is maximum rate of water temperature changes at concerned stations through July & August. Therefore it may find a reducing process and minimum rate in February as well. pH rate of water was in optimized scope in all stations and through all months of the year (6.5-9.5 mg/liter). It was at minimum rate at all stations through the September & October. The quantity of liquid oxygen in water was in optimized scope (more than 5 mg/liter) in all stations and all months of the year. Then it may reach to the minimum rate through July & August and then to its maximum amount in winters. Biochemical oxygen demand of water had the maximum rate at station No. 1 in the middle of October. Generally we had biochemical oxygen demand more than permitted maximum rate. The process of nitrate changes in all stations was in optimized scope in all months of the year. Any agricultural activities and distribution of agricultural lands besides this river and also presence of neighboring villages and civil areas, have great roles in pollution of the river water.