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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 5 | Copyright
Nat. Hazards Earth Syst. Sci., 16, 1063-1077, 2016
https://doi.org/10.5194/nhess-16-1063-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 May 2016

Research article | 10 May 2016

Statistical model for economic damage from pluvial floods in Japan using rainfall data and socioeconomic parameters

Rajan Bhattarai1,2, Kei Yoshimura1, Shinta Seto3, Shinichiro Nakamura4, and Taikan Oki5 Rajan Bhattarai et al.
  • 1Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwano-ha, Kashiwashi, Chiba, 277-8564, Japan
  • 2Department of Irrigation, Government of Nepal, Jawalakhel, Lalitpur, Nepal
  • 3Graduate School of Engineering, Nagasaki University, 1-14 Bukyomachi, Nagasaki, Japan
  • 4Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
  • 5Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, Japan

Abstract. The assessment of flood risk is important for policymakers to evaluate damage and for disaster preparation. Large population densities and high property concentration make cities more vulnerable to floods and having higher absolute damage per year. A number of major cities in the world suffer from flood inundation damage every year. In Japan, approximately USD1 billion in damage occurs annually due to pluvial floods only. The amount of damage was typically large in large cities, but regions with lower population density tended to have more damage per capita. Our statistical approach gives the probability of damage following every daily rainfall event and thereby the annual damage as a function of rainfall, population density, topographical slope and gross domestic product. Our results for Japan show reasonable agreement with area-averaged annual damage for the period 1993–2009. We report a damage occurrence probability function and a damage cost function for pluvial flood damage, which makes this method flexible for use in future scenarios and also capable of being expanded to different regions.

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The assessment of flood risk is important for policymakers to evaluate flood damage and for disaster preparation. Large population densities and high property concentration make cities more vulnerable to floods and have higher damage per year. In Japan, about one billion USD in damage occurs annually due to floods related to rainfall only. In this paper, we report a damage occurrence probability function and a damage cost function for pluvial flood damage to estimate annual flood damage.
The assessment of flood risk is important for policymakers to evaluate flood damage and for...
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