Abstract
This paper describes the process of dicision making of disaster mitigation measure in Muraita district, Maibara, Shiga pref. These measures which were consisted by unstructured sheme was conducted with public office and residents. Depth gauges attached in river is provided to contribution to evasuation judgement with observation. Evacuation map was made by residents participated in disaster drill. Moreover, depth signboards were attached to promote the flood risk in this area. This paper shows the importance to decide disaster mitigation measures organically.