TheeffectofacidicrainfallanditsintensitychangeinerodibiltyofAghajariformation (Acasestudy: ApartofmarghawatershedareainIzehtownship)

One of the effects and consequences of air pollution is acidic rain phenomenon. In the past two decades in some industrial areas and factories on the activities of sulfur dioxide and nitrogen dioxide in air has increased. These two materials in the atmosphere with oxygen and water vapor create a chemical reaction and to nitric and sulfuric acid are converted. In this study, in order to investigate the sensitivity of erosion and sediment yield of Aghajari Formation to acidic rainfall, parts of Margha watershed area in Izeh Township are selected with the area of 1609 hectare. This investigation in order to determine productivity runoff and sediment in 8 points and with 3 replicates in aghajari formation in different intensities 1, 1/25 mm in min and in the intensities of distilled water and 4, 5 acidic water in four aspects of northern, southern, eastern, western with using kamphorst rain simulator was done. In order to analyze statistical was used SPSS and EXCEL packages. The highest of runoff and sediment rates in aghajari formation in 1, 1/25 mm in min are related to 4 acidic rainfalls. The rainfall of 5 acidic also runoff and sediment is more than the rain of distilled water. The rates changes in infiltration and threshold runoff in rainfall different intensities also showed significant difference.