Simulation of a River Water Quality by ANN (Case Stuy of Zayandehroud River; Lenj Station) and Effect of Salinity in This Region Agriculture

Iran is one of the arid countries in the world. In recent years due to universal climate change, precipitation reduction is happened. The Rivers are the most important domestic water resources and agricultural consumptions and areeffected by the rainfalls reduction. Amount of salts in the rivers is increasing and threat life of organism. Therefore expectancy of amount of salts in the river considering to rainfalls reduction is necessary. Three years information of Lenj station is used at Zayandehrood River in this research. The monthly precipitation considered as the input and the river pollutants as output. Modeling was showed, discharge with 37.87 percent error, is lowest correlation and TDS & EC with 17.29, 19.84 % error are highest correlation. And was showed, it is not relative between discharge and precipitation.