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Change in the Annual Water Withdrawal-to-Availability Ratio and Its Major Causes: An Evaluation for Asian River Basins Under Socioeconomic Development and Climate Change Scenarios

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  • Ayami Hayashi
  • Keigo Akimoto
  • Takashi Homma
  • Kenichi Wada
  • Toshimasa Tomoda

Abstract

More than half of the world's population lives in Asia, and ensuring a stable water supply is a critical issue. This study evaluates changes in the annual water withdrawal-to-availability ratio (WAR), and the major causes  thereof, for each of Asian river basins under different socioeconomic development and climate change scenarios. According to our evaluation, the WAR will increase in 59%–61% of the Asian river basin areas by around 2030, as a result of population growth and the increase in per capita municipal and industrial water withdrawals. On the other hand, the WAR will decrease in 8%–16% of such areas, due to the increase in water availability associated with global warming and a decrease in per capita water agricultural withdrawal. After 2030, there will be a reduction of areas with increasing WAR because of a slowdown in the growth of both population and per capita municipal and industrial water withdrawals, while there will be an expansion of areas with decreasing WAR caused by continual decrease in per capita agricultural water withdrawal and intensified water availability. Significant measures to suppress WAR increase will differ by river basin, depending on the causes for the WAR increase. For instance, measures to deal with population increase and efforts to improve industrial and municipal water use by around 2030 will be important in the Huang He river basin. In the Indus river basin, coping with the decrease in water availability after around 2030 will be important. In addition, measures to handle population increase will be necessary.

Suggested Citation

  • Ayami Hayashi & Keigo Akimoto & Takashi Homma & Kenichi Wada & Toshimasa Tomoda, 2014. "Change in the Annual Water Withdrawal-to-Availability Ratio and Its Major Causes: An Evaluation for Asian River Basins Under Socioeconomic Development and Climate Change Scenarios," Energy and Environment Research, Canadian Center of Science and Education, vol. 4(2), pages 1-34, June.
    • Handle: RePEc:ibn:eerjnl:v:4:y:2014:i:2:p:34
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    References listed on IDEAS

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    1. N. W. Arnell & J. A. Lowe & S. Brown & S. N. Gosling & P. Gottschalk & J. Hinkel & B. Lloyd-Hughes & R. J. Nicholls & T. J. Osborn & T. M. Osborne & G. A. Rose & P. Smith & R. F. Warren, 2013. "A global assessment of the effects of climate policy on the impacts of climate change," Nature Climate Change, Nature, vol. 3(5), pages 512-519, May.
    2. Keigo Akimoto & Fuminori Sano & Ayami Hayashi & Takashi Homma & Junichiro Oda & Kenichi Wada & Miyuki Nagashima & Kohko Tokushige & Toshimasa Tomoda, 2012. "Consistent assessments of pathways toward sustainable development and climate stabilization," Natural Resources Forum, Blackwell Publishing, vol. 36(4), pages 231-244, November.
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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