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Managing shallow aquifers in the dry zone of Sri Lanka

  • Aditya Sood
  • Herath Manthrithilake
  • Salman Siddiqui
  • Ameer Rajah
  • S. Pathmarajah
Article

Abstract

This study looks at the groundwater issues in the dry zone of Sri Lanka and shows how the use of remote sensing with high-resolution images can help in groundwater management. A new approach is developed for automatic extraction of the location of agro-wells using high-spatial-resolution satellite imageries. As an example, three pilot sites in three different aquifer systems in the country are considered, and their high-resolution images are analyzed over two temporal time periods. The analysis suggests that the well density in all three regions has increased over the last few years, indicating higher levels of groundwater extraction. Using the well inventory developed by this new approach, the water budgeting was prepared for the mainland of Jaffna Peninsula. The analysis shows a wide variation in well density in the Jaffna Peninsula, ranging from (as little as) less than 15 wells per square kilometer to (as high as) more than 200 wells per square kilometer. Calculations made for the maximum allowable water extraction in each administrative division of Jaffna show that less than 3 h of daily extraction per well is possible in some districts. This points to an increasing pressure on groundwater resources in the region and thus highlights the importance of understanding groundwater budgets for sustainable development of the aquifers.

Keywords

Agro-wells Groundwater Shallow aquifer Remote sensing Water budgeting 

Notes

Acknowledgments

This study was partly funded by the CGIAR Research Program on Water, Land and Ecosystems (WLE). We authors gratefully acknowledge the partnership with Agricultural Engineering Department, University of Jaffna, Institute of Fundamental Studies, Kandy, and Department of Agricultural Engineering, University of Peradeniya.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Aditya Sood
    • 1
  • Herath Manthrithilake
    • 1
  • Salman Siddiqui
    • 1
  • Ameer Rajah
    • 1
  • S. Pathmarajah
    • 2
  1. 1.International Water Management Institute (IWMI)ColomboSri Lanka
  2. 2.Department of Agricultural Engineering, Faculty of AgricultureUniversity of PeradeniyaPeradeniyaSri Lanka

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