A Basin-scale Spatial Distribution of Probable Maximum Precipitation for the Yodo River Basin, Japan

Abstract

The objective of this paper is to analyze the extreme rainfall in term of the PMP estimates for the Yodo River basin. The PMP are estimated using the Hershfield statistical method. Since the method uses statistical approaches, long recorded data available in Japan were able to be fully utilized. A limitation by using the Hershfield statistical method is that only point PMP are estimated. Using the point PMP estimates, a spatial PMP of 1-day, 2-day, 3-day, 5-day, and 7-day rain were developed. The paper describes the methodology used to produce the spatial PMP and discuss on the PMP distributions over the basin area. Comparison between the spatial PMP and previous flood historical records were also conducted. Good agreement were observe from the comparison confirming reasonable spatial PMP distribution were constructed.