Nationwide Probabilistic Flood Discharge Dataset (d4Flood) now available

This dataset provides estimates of flood peak discharges corresponding to various return periods across all river channels in Japan, including small- and medium-sized rivers, under present and future climate conditions (assuming global temperature increases of +2°C and +4°C).

From the 5-km mesh ensemble climate projections (d4PDF_5kmDDS_JP), approximately 3,000 to 5,000 heavy rainfall events were extracted for each region. These were used as input to the nationwide Rainfall-Runoff-Inundation (RRI) model, which represents Japan's topography at a 150-meter resolution. Flood discharges were simulated for all river reaches across Japan, and the results are compiled in this dataset.

For more details, please refer to the matadata page and “Dataset Overview” PDF file which can be downloaded along with the dataset.