Tadesse, Samuel (PhD)Hlefome, Lemma2018-06-262023-11-112018-06-262023-11-112016-03http://etd.aau.edu.et/handle/12345678/3690Various studies have shown that the physical and chemical properties of soil are major cause of soil erosion and the formation of erosion gully. This study was intended to investigate erosion resistance of the soil and cause of erosion gully along the Adama–Iteya road section. The assessment was achieved by conducting different physical and chemical laboratory tests on collected soil samples along the study area. The test results of the soil along the study area shows that, it is highly susceptible to water erosion. Grain size of the soil in the study area is uniform and poor graded fine sand and silty soil. These soils are small in size compared to sands and do not bind together like clays and are subject to the most erosion. The test result indicates that the soils along the study area are non plastic. The non plastic and cohensionless properties of the soil in the area is account for the formation of gully erosion. The maximum dry density values of the soil are generally low and it indicate that the natural deposits are loose and account for the high void ratio and the high void ratio of the soil will generate high flow velocities, high seepage pressure and account high internal erosion potential. The chemical test results of the soil samples along the study area shows it has contain relatively high percent sodium concentration and it will be easily eroded. An integrated approach including watershed management strategies, Construction of ditches (concrete or masonry) at appropriate locations and filling the gully with high plastic reddish clay soil, and a long term re-vegetation strategy are recommended for mitigation and controlling soil erosion and gulling in the study areaenGeotechnical Engineering