The Investigation of Khomeygan River Discharge Changes in Razan City of Hamedan Province During a Thirty Years’ Period

Since, water is the main source of economic development, social security, and poverty reduction, and the surface waters due to their availability and low-cost exploitation are as one of the main sources of water supply for human requirements, hence great care should be taken in the management of these waters. Since, one of the ways to effectively use these waters is, understanding the decreasing quantity of water. Primarily, we need accurate information for each correct and exact planning. At this critical water position, meanwhile that hydrology science help to studying about water in the earth and discusses the appearance, revolution and distribution of water in nature, physiochemical characteristics of water, water reactions in the nature and its relation with living beings, hydrological research of the surface waters by collecting the information about the rivers regimes and monitoring their discharge data is useful for the flood forecast, drought control, expansion of water saving operation plans, and other relevant schematization programs. In this paper, the studies have been done on the Khomeygan River, is one of the most important surface water resources in the Razan city of Hamedan province. Then, the diagram of hydrograph, the rainfall trend on the basin of this river, and the discharge changes during the statistical period of thirty years has been surveyed. Eventually, by the geographical condition of Hamedan province of Iran, this information has been shown that the protection and keeping of this river are very significant and essential for the city of Razan due to the urbanization development and industrial growth.