Urban Flood Control Policy For Sustainability
Under Global Warming In Japan
Author(s)
Y. Kawata
Abstract
Under rapid urbanization, any conventional flood control measure is no longer
sufficient for class-A rivers in Japan. In answer to this problem, the construction
of high specification levees (super levees) began in 1987, initially along
especially important class-A rivers. This construction method involves restricting
the slope on the city side of the levee to a gentle gradient of approximately 1/40
so as to prevent the levee from breaking when flood water flows over the levee.
Meanwhile, smaller rivers, known as urban rivers, have been the subject of a
method of dealing with urban water disasters using comprehensive flood control
strategies that were adopted at the end of the 1970s. After witnessing incidents of
localized torrential rain throughout the nation caused by global warming since
around 1995, it was clear that changes needed to be made to these flood control
measures. Changes were necessary because the rainfall was so extreme that in
many cases inundation inside the levee and by river water began occurring
simultaneously, and because the inundation of both cities and rivers increased in
scale. Of particular concern was the possibility of flooding in urban areas leading
to the flooding of subterranean spaces. The \“Urban Rivers Anti-Flood Measure
Act” was implemented in April 2004 in response to the frequent occurrence of
this kind of urban flooding with the aim of reducing flood damage in urban
areas.
Keywords: urban flooding, urban river, torrential rain, global warming, urban
flood control, disaster management, disaster reduction strategy.
Keywords
urban flooding, urban river, torrential rain, global warming, urban
flood control, disaster management, disaster reduction strategy.
Related Book
Other papers in this volume
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