Abstract
We considered the material characteristics of embankment and foundation ground round the small earth dams for irrigation damaged by the past large-scale earthquakes in five prefectures to use a Geographic Information System (GIS) with the reservoir ledger data. These small earth dams for irrigation could be the historic agricultural hydraulic structures supported cultivated land development during modernization in Aomori Pref. and Fukushima Pref.. As the results of considering quantitatively the material combination ratio of the embankment and foundation ground of the existent small earth dams for irrigation around those dams reported to damage by liquefaction in Aomori Pref., Akita Pref. and Hyogo Pref., there were a lot of the foundation ground materials with sand and it indicated the possibility of damage by liquefaction. Also, because there was no great influence by the possible ratio of damage occurrence even if assuming that the foundation ground in many uninvestigated places was the same material as the embankment, the importance of making the material properties of embankments clear by being able to investigate easily the embankment material was indicated.
