The Trend in Measures Against Urban Inundation in Japan
The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
All over Japan, damage has occurred from flood from inland waters. Because the measures against urban inundation should be promoted swiftly and economically, the Ministry of Land, Infrastructure, Transport and Tourism has implemented policies to push forward efficient and effective mitigation measures. Such comprehensive policies combine tangible and intangible measures and select prioritized areas for implementation. In June 2020, forecasting methods for probable maximum rainfall were announced, taking heavy rain and climate change into consideration. Furthermore, because a sewer system itself can be damaged from heavy rain, measures have been adopted to make a water-resistant sewerage system. In this manner, various policies in Japan address measures against urban inundation.
-  The Intergovernmental Panel on Climate Change (IPCC), “Climate Change 2014: Synthesis Report – Summary for Policymakers,” The 5th Assessment Report of IPCC, 2014.
-  Japan Meteorological Agency, “Heavy rain in July 2018 and record high temperature characteristics and factors after mid-July,” 2018, https://www.jma.go.jp/jma/press/1808/10c/h30goukouon20180810.html (in Japanese) [accessed December 20, 2020]
-  S. Shisheger, S. Duchesne, and G. Pelleter, “Optimization methods applied to stormwater management problems: a review,” Uraban Water J., Vol.15, No.3, pp. 276-286, 2018.
-  N. Kang et al., “Urban Drainage System Improvement for Climate Change Adaptation,” Water, Vol.8, No.7, Article 268, 2016.
-  P. Willems et al., “Climate change impact assessment on urban rainfall extremes and urban drainage: Methods and shortcoming,” Atmospheric Research, Vol.103, pp. 106-118, 2012.
-  Ministry of Land, Infrastructure, Transport and Tourism, “Recommendation about promotion of measures against urban inundation by sewerage based on climate change (reference material),” (in Japanese) [accessed December 20, 2020]
-  H. Kato et al., “How the assumed maximum-scale rainfall should be considered in estimates of landside inundation,” J. of Japan Sewage Works Association, Vol.54, No.653, pp. 96-104, 2017 (in Japanese).
-  Study Group on Urban Inundation Countermeasures Based on Climate Change, “Recommendation about promotion of urban inundation countermeasures by sewerage based on climate variability,” June 2020 (in Japanese).
-  Technical Study Group on Hydraulic Control Plans Based on Climate Change, “Recommendation about hydraulic control plans based on climate change,” October 2019 (in Japanese).
-  L. Hoang and R. A. Fenner, “System interactions of stormwater management using sustainable urban drainage system and green infrastructure,” Urban Water J., Vol.13, No.7, pp. 739-758, 2016.
-  Ministry of Land, Infrastructure, Transport and Tourism, Social Infrastructure Development Council, and River Subcommittee Report, “Flood disaster countermeasures based on climate change: conversion to hydraulic control of basin by all stakeholders throughout basin,” July 2020 (in Japanese).
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