Software and practice example file can be download from the link below https://www.pwri.go.jp/icharm/researc...

RainfallRunoffInundation (RRI) model
To predict the behavior of largescale inundation in lowlying areas in a short period of time, ICHARM has developed a new numerical model called RainfallRunoffInundation (RRI) model. The model simulates various hydrologic processes including rainfallrunoff, streamflow discharge, and inundation over floodplains in an integrated manner.

The RRI model is expected to help assess future flood risk for various regions with different climate conditions, for example, based on climate change projections. Similar to the IFAS system, the model is also applicable to largescale flood prediction on a near realtime basis by using satellitebased topography, landuse and rainfall information.

The RRI model was awarded for its excellence in 2014 by the Japan Society of Civil Engineers. The ICHARM researcher who developed the model also received 2013 Young Scientists' Prize by the Ministry of Education, Culture, Sports, Science and Technology, and received the 15th Infrastructure Technology Development Award by the Ministry of Land, Infrastructure, Transport, and Tourism in 2013.