Localized intense thunderstorms continued over the three days of 17-19 May, culminating in a major flood peak about 3am on the 19th with a stage of about 2.1 m (discharge >100 m3/s). Over the past 18 years of record, flood peaks have exceeded 2 m on only a few occasions during the June-August mid-summer season, but this is the first time to experience such a flood in May. The maximum precipitation intensities measured are new records for the month of May.
Precipitation (17-19 May):
Station Total Max intensity
Miomote 216 mm 23.5 mm/h
Takane 238 mm 38 mm/h
Takiya-2 235 mm 28.5 mm/h
The discharge measurement taken on 21 May showed that significant channel aggradation has taken place. We will have to quickly establish a new stage-rating curve and monitor for changes closely over this summer season.
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