Estimation of supplementary water to paddy fields in the lower Mekong River basin during the dry season

Hiroaki Somura, Hajime Tanji, Koshi Yoshida, Osamu Toda, Katsuhiro Higuchi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Efficient management of water resources in paddy fields requires an understanding of the volume of supplementary water used. However, quantifying the volume is laborious due to the large amount of data that must be collected and analyzed. The purpose of our study was to estimate the volume of supplementary water used in paddy fields, based on several years of available statistical data, and to provide information on how much water can be supplied to paddy fields in each target area. In this study, the lower Mekong River basin of northeast Thailand, Laos, and Cambodia was selected as the study area. In the first step, we used agricultural statistics for each country, rainfall data acquired from the Mekong River Commission Secretariat (MRCS), and the value of virtual water required per unit of rice production. Because several years of data were used for dry season harvested areas and rice production in each country, the supplementary water to paddy fields in each province was calculated using virtual water and rainfall. This method made it possible to estimate changes in supplementary water in each province. Through this study, the supplementary water to paddy fields during the dry season in three countries was approximated from the minimum number of data sets. Moreover, for cases in which it is not possible to procure agricultural water use data for a hydrological model simulation, an alternative solution is proposed.

Original languageEnglish
Pages (from-to)177-186
Number of pages10
JournalPaddy and Water Environment
Volume3
Issue number3
DOIs
Publication statusPublished - Sep 2005

Keywords

  • Cambodia
  • Laos
  • Monsoon Asia
  • Rice production
  • Thailand
  • Virtual water
  • Water use

ASJC Scopus subject areas

  • Environmental Engineering
  • Agronomy and Crop Science
  • Water Science and Technology

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