Abstract
There is an urgent need to design disaster mitigation measures for agricultural irrigation facilities in the event of a large-scale earthquake. At the time of a large-scale earthquake, facilities could be unexpectedly damaged, so disaster response to prevent further damage after the facilities are hit is important. However, disaster response doesn't always work smoothly when a large-scale earthquake occurs. To establish risk management aimed at improving disaster response capabilities for the management of irrigation canals, this study targets typical main irrigation canal, which consist of headworks and open channels, toward identifying risk sources that hinder disaster response at the time of large-scale earthquakes. Results from an interview survey of facility managers found that their main concern in terms of disaster response immediately after the occurrence of an earthquake is the determination of whether water flow in the main irrigation canals should be halted or not. Therefore, Fault Tree Analysis (FTA) was applied to identify risk sources that cause errors in judgement by facility managers in such circumstances. Results clarified not only the risk sources that can currently be dealt with within the framework of existing facility management, but also additional risk sources for which measures have yet to be discussed as a part of a regional disaster prevention plan involving local residents.
