Paddy and Water Environment

, Volume 8, Issue 3, pp 217–226 | Cite as

The role of paddy rice in recharging urban groundwater in the Shira River Basin

  • Kenji Tanaka
  • Yoshitaka Funakoshi
  • Takaomi Hokamura
  • Fumihiko Yamada
Article

Abstract

Agricultural fields in the middle Shira River basin play an important role as a source of groundwater recharge; however, the water balance between the agricultural water and river water is unclear. This study was conducted to investigate the water balance in the fields by measuring the stream flow of agricultural water channels, which draw water from the Shira River. The flow rate of water channels was found to increase in the beginning of May, which corresponded to the cultivation of paddy rice fields. During summer, the total agricultural intake was comparable to the river flow observed in the middle Shira River Basin. Determination of the water budget for the targeted area revealed that most of the recharged water was dependent on agricultural irrigation from the river. The annual recharge of the overall target area was estimated to be as high as 15,300 mm. In addition, the infiltration rate was as high as 170 mm/day in the paddy fields during summer, and as high as 30 mm/day in the upland fields during winter. In order to recover the groundwater recharge in this region, it is necessary to extend the submerged period to include periods in which the stream water in the Shira River is not subject to heavy rainfall as well.

Keywords

Kumamoto Shira River Agricultural water Groundwater recharge Water balance 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Kenji Tanaka
    • 1
  • Yoshitaka Funakoshi
    • 1
  • Takaomi Hokamura
    • 1
  • Fumihiko Yamada
    • 1
  1. 1.Department of Civil and Environmental Engineering, Graduate School of Science and TechnologyKumamoto UniversityKumamotoJapan

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