Water Leakage through Embankment of an Overage Irrigation Tank : A Case Study to Identify Leaky Transections

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Abstract

Small-scale irrigation tanks have been an important source of irrigation in Japan. These contribute nearly 10% of the total irrigated area, controlling the ravages of drought. Since many of the total 246,158 tanks are centuries-old, their rehabilitation and/or modernization are in emerging need. This paper is associated with one of the serious issues envisaged, i. e., excess leakage of impounded water through an earthen embankment. As a case study, an attempt is made to identify leaky embankment transections for an overage tank in Matsuyama, Ehime Prefecture, Japan, which is in real need of rehabilitation to prevent a calamity of the subsequent embankment-break. Using the up-to-date data (tank water level, water level and temperature in the boreholes installed, leaked water amount, etc.) obtained from long-term in-situ observations, their relational analyses are carried out to investigate the hydro-geological aspects of the embankment and find a transection of major leakage-path. The results demonstrate that the leaky transection with extremely high permeability (1.0 × 10^<-2> cm/s) exists closely to the right-bank of the tank, and the flow seeping along the toe of the embankment is indeed a result of leakage of the impounded water.

Journal

  • Journal of Rainwater Catchment Systems

    Journal of Rainwater Catchment Systems 6(1), 21-25, 2000

    Japan Rainwater Catchment Systems Association

References:  3

Cited by:  1

Codes

  • NII Article ID (NAID)
    110002696275
  • NII NACSIS-CAT ID (NCID)
    AA11657953
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    1343-8646
  • NDL Article ID
    5707533
  • NDL Source Classification
    ZM2(科学技術--科学技術一般--大学・研究所・学会紀要)
  • NDL Call No.
    Z74-B360
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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