(1) Abstract: Urban flood flooding technology uses digital elevation model, land use map, rainfall data and measured data, through changing the land use type, water pump, artificial structure and other different situations, simulation of urban flood flooding depth and area, and can assess the flooding of urban flood Risk and economic loss. And Japan Kyoto University, the use of Flo-2D model and GIS technology.
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（2）Title:Spatiotemporal evaluation of water quality incidents in Japan between 1996 and 2007
Abstract: we present a spatiotemporal evaluation of water quality incidents in Japan considering incident numbers, incident causes, pollutant categories, and pollution effects. Water pollution incidents in first-calss river systems almost tripled to about 1487 in the 12 years from 1996 to 2007. In addition, oil makes up the largest proportion of pollutants nationwide(76.61%) and the major source of pollution for each region in Japan. Moreover, every category shows a growth trend, especially since 2005. The main cause of incidents was “Unknown”(43%), followed by “Poor working practice”(24%), and then by “Accident”(10%) and “Other”(10%). In Hokuriku, however, the main cause of incidents was “Poor working practice”(36%), which is greater than “Unknown” (30%). Finally, waterworks (approximately60%) was the largest of four kinds of water supply infrastructure affected by pollution incidents, followed by simplified waterworks. The population affected by offensive odors and tastes peaked in 1990 and has been decreasing.
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