JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES
Online ISSN : 1349-2853
Print ISSN : 0915-1389
ISSN-L : 0915-1389
Original Research Article
Estimation of Irrigation Water to Paddy Fields under Conditions of Poor Data Availability, Cambodia
Hiroaki SOMURAHajime TANJIKoshi YOSHIDAOsamu TODATakao MASUMOTO
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JOURNAL FREE ACCESS

2005 Volume 18 Issue 1 Pages 22-34

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Abstract

Irrigation water is generally estimated by hydrologic models. It is difficult, however, to determine the amount of irrigation water in areas with poor data availability. In this study, irrigation water was estimated by calculating back from rice production at a macro scale. It was assumed that the irrigation water was expressed by the amount of pump irrigation. Kandal and Siem Reap Provinces in Cambodia were chosen as calibration areas for the model and Banteay Mean Chey Province was selected for verification of the model parameter values. The irrigation water was estimated by the IWE model, which consists of two sub-models: a soil water estimation (SWE) model for calculating the water content of each soil type and a total rice production (TRP) model based on yield decrease estimation. The reliability of the model parameter values was low when parameter values related to soil water content were determined for only one province. Thus, the model parameter values were determined for two provinces at the same time. By comparing errors of estimated and actual rice production in two provinces under a unified classification of the soil type, the reliability of the model parameter values was considerably higher. In the result of verification of common parameter values in Banteay Mean Chey Province, a difference between the estimated and actual rice production was less than 10%. This method is considered useful for estimating irrigation water under similar conditions such as water shortage, which is one of the most serious causes of decrease in production.

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© 2005 Japan Society of Hydrology and Water Resources
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