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Assessing the impacts of climate change on irrigation diversion water requirement in the Philippines

Author

Listed:
  • Lanie A. Alejo

    (Isabela State University)

  • Victor B. Ella

    (University of the Philippines)

  • Rubenito M. Lampayan

    (University of the Philippines)

  • Aurelio A. Delos Reyes

    (University of the Philippines)

Abstract

This study assessed the impacts of climate change on diversion water requirements for irrigation system planning and development in the Philippines. Representative sites with high potential for irrigation development were selected from each of the four climatic types in the country. Cropping calendars were developed based on evapotranspiration and rainfall patterns. The CROPWAT program was used to determine the net irrigation requirement, from which the irrigation diversion requirements were derived based on estimated irrigation efficiencies. Recently published climate projections using the representative concentration pathways were used as climate change scenarios. Results of this study showed that the CROPWAT estimates of evapotranspiration were satisfactorily calibrated and validated using the eddy covariance methods. Climate change could lead to a significant increase in diversion water requirement. The increase in diversion water requirement was projected to reach + 43% during dry years, + 32% during normal years, and + 42% during wet years. A favorable reduction in diversion water requirement due to timely occurrence of rainfall was however observed at the site with distinct wet and dry season during dry years (up to − 7%), normal years (up to − 11%), and wet years (up to − 12%). The cropping patterns varied within and across climate types. The projected estimates of diversion water requirements generated in this study could be used for irrigation system planning and development particularly for assessing water storage requirements and design irrigable areas. Results could also be used as part of planning and design criteria for dams and reservoirs and thereby contribute to climate proofing of irrigation systems. The application of methods developed in this study for estimating diversion water requirements with the incorporation of climate change may be extended to other parts of the country and in other parts of the world for a more climate-resilient water resources planning.

Suggested Citation

  • Lanie A. Alejo & Victor B. Ella & Rubenito M. Lampayan & Aurelio A. Delos Reyes, 2021. "Assessing the impacts of climate change on irrigation diversion water requirement in the Philippines," Climatic Change, Springer, vol. 165(3), pages 1-17, April.
    • Handle: RePEc:spr:climat:v:165:y:2021:i:3:d:10.1007_s10584-021-03080-6
    DOI: 10.1007/s10584-021-03080-6
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    References listed on IDEAS

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    1. Droogers, Peter, 2004. "Adaptation to climate change to enhance food security and preserve environmental quality: example for southern Sri Lanka," Agricultural Water Management, Elsevier, vol. 66(1), pages 15-33, April.
    2. De Silva, C.S. & Weatherhead, E.K. & Knox, J.W. & Rodriguez-Diaz, J.A., 2007. "Predicting the impacts of climate change--A case study of paddy irrigation water requirements in Sri Lanka," Agricultural Water Management, Elsevier, vol. 93(1-2), pages 19-29, October.
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    Cited by:

    1. Lanie A. Alejo & Arlen S. Alejandro, 2022. "Changes in Irrigation Planning and Development Parameters Due to Climate Change," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(5), pages 1711-1726, March.

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