ANALYSIS FOR THE EFFECTIVE USE OF INFORMATION ON SEWER RUNOFF BASED ON PRECIPITATION FORECASTS

In recent years, the number of localized heavy rainfall events has been on the increase, resulting in many water-related accidents. In this study, the accuracy of short-time precipitation forecasts and high-resolution precipitation nowcasts published by the Japan Meteorological Agency were verified, and an analysis was conducted regarding the safety assurance of sewer construction. Furthermore, since the depth of water in sewer pipelines is also greatly related to safety, we analyzed the effect of different amounts of rainfall in a short period of time on the depth of water in sewer pipelines. It was found that the prediction accuracy decreased as the prediction time became longer, and that the difference in rainfall affected the depth of water in the sewer pipe, which in turn affected whether it was possible to walk in the pipe or not.