Study on structure and function of an earthen bund irrigation system in Northeast Thailand |
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| Authors: | Email author" target="_blank">Keisuke?HoshikawaEmail author Shintaro?Kobayashi |
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| Institution: | (1) Research Institute for Humanity and Nature, Ministry of Education, Culture, Sports, Science and Technology, 335 Takashima-cho, Kamigyo-ku, 602-0878 Kyoto, Japan;(2) Graduate School of Global Environmental Studies, Kyoto University, Yoshida Honmachi, Sakyo-ku, 606-8501 Kyoto, Japan |
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| Abstract: | In Northeast Thailand, which overlaps with an erosional plain that is not suitable for irrigation because of poor water resources and terrains that prevent efficient water distribution, farmers have long supplied water to surrounding paddy fields by blocking rivers completely with earthen bunds. Although such a traditional irrigation system fits well with the characteristics of Northeast Thailand, those who are concerned with modern irrigation development projects in Northeast Thailand seem to have been paying little attention to it. The present study was performed to facilitate development of more appropriate irrigation systems in Northeast Thailand by providing information regarding traditional irrigation methods. We investigated the traditional irrigation methods with earthen bunds at three study sites, and our results indicated that styles of irrigation vary with riverbed slope. The traditional irrigation system that is used in most of Northeast Thailand is different from ordinal weir irrigation, in that paddy fields are not irrigated by gravity flow but by backwater of earthen bunds. Our results suggest that the development of more successful irrigation systems would be possible through improvement of the design ideas of traditional irrigation methods. |
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| Keywords: | Earthen irrigation bund Irrigation by backwater Gravity irrigation Topography Erosional plain |
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