About OYAMA MAKOTO
About 国土交通省 水管理・国土保全局
About mudflow deposit damage
About disaster prevention
About disaster prevention planning
About disaster countermeasure
About refuge
About natural disaster
About alarm
About education
About Ministry of Land,Infrastructure and Transport
About non-structural measure
About hazard map
About educational activity
About warning information
About caution refuge
About introduction of case
About District disaster management plan
About Sediment-Related Disaster Prevention Act
About evacuation drill
About evacuation plan
About protection measures
About General,sabo engineering
About Natural disasters
About 防災情報
About 土砂災害
About ソフト
About 対策