Inundation Risk Assessment Of
Underground Spaces In The Downtown Of
Fukuoka City, Japan
Author(s)
H. Hashimoto & K. Park
Abstract
Two flood events, which were due to short-time heavy rainstorms, hit the
downtown of Fukuoka City in Japan in 1999 and 2003. The Mikasa River in this
city overflowed its banks, and then the overflowing water moved down the roads
to the railroad station, called ‘Hakata-eki’. This area is a dense downtown with
many office buildings and underground spaces utilized for restaurants, parking
garages, shopping malls and a subway station. The flooding water inundated the
basements of many buildings and the other underground spaces. The purpose of
the present study is to develop an inundation risk assessment method for
underground spaces. Firstly, two types of underground spaces near the ‘Hakataeki’
railroad station can be distinguished; one is a small-scale underground space
utilized for restaurants and parking garages, and the other is a large-scale
underground space for a subway station and shopping malls. Secondly, the
floodwater behaviour within the two types of underground spaces is simulated.
Finally, on the basis of the simulation, a method for risk assessment of
inundation of underground spaces due to a flood event is proposed.
Keywords: urban flood, underground space, flood risk management.
1 Introduction
A heavy rainstorm hit Fukuoka City in Japan on June 29, 1999. Rainfall began at
4:00 p.m. on June 28 and ended at 11:00 a.m. on June 29. The main rainfall
lasted from 6 to 10 a.m. on June 29. The accumulated rainfall was 159.5 mm
from 4:00 p.m. on June 28 to 11:00 a.m. on June 29. The largest hourly rainfall
Keywords
urban flood, underground space, flood risk management
Related Book
Other papers in this volume
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