investigation the effects of flood water spreading on infiltration trend in bushehr province

flood spreading has an effective role in the soil improvement and fertility, ground water storage, revival of vegetation and prevention of fluent sands movement. one of the main problem of flood spreading projects is the entrance of sediment to the spreading systems and sedimentation in it. sediment reduces the efficiency of the flood spreading system and after awhile lose its efficiency.the main aim of this research is the investigation of infiltrate changes trend under effect of flood spreading in tangestan flood spreading station (bushehr province). in this research, soil surface infiltration in spreading and control area were measured with double rings method. for investigating of these changes the intervals between flood spreadng channels, the first, second and third rows were selected. data were analyzed by kruskal-wallis test. due to the significant level of this test, less than 0.01, can be expressed that between the infiltration of flood spreading rows and control area were significant difference.