Time Studies
Online ISSN : 2424-208X
Print ISSN : 1882-0093
ISSN-L : 1882-0093
Characteristics of Flood Disaster in Chikuma City of Nagano Prefecture by Typhoon No.19 in 2019 and Change of Spatio-Temporal on 'Kasumitei'
Haruhiko YAMAMOTOYuka WATANABENaoki KANEMITSUMitsuyoshi MATSUOKAYuta FUKUNAGAKyoko SAKAMOTOKiyoshi IWAYA
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2020 Volume 11 Pages 35-56

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Abstract

During the Typhoon 19 in 2019, 553 mm of rain was recorded on October 12 at Kamiishido in the Saku District, located in the upper Chikuma River of Nagano Prefecture, as part of record-breaking rainfalls that hit upstream districts. At 21:50 that day, a water level of 6.4 m, greatly exceeding the danger level of 5 m, was observed at the Kuisege Water Level Observatory at Chikuma City located midstream in the Chikuma River. A flood stream into the opening of the Shinden intermittent embankment from the Chikuma River also overflowed, as did another over the levee on the river’s inland bank in the Shinden and Kuisege Districts. Because inundation damages caused by flooding affected 1,677 households in Chikuma City, verifying the closure of the opening of intermittent embankment (Kasumitei) has been pushed forward. Residents in the flooded districts have been encouraged to relocate, while their city functions and measures have been encouraged to reduce the inundation damages are required.

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© 2020 The Japanese Society for Time Studies
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