This course is to help students understand various types of sediment disaster often occurs on slope land, causes of the sediment disaster, disaster assessment, and countermeasure strategies. The following topics will be covered in the course: causes of sediment and the transport of sediment, sediment disaster prevention for agricultural and non-agricultural activities on slope land, disaster related to landslide as well as landslide survey, disaster related to debris flow and assessment for debris- flow occurrence potential.