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Asian Journal of Agriculture and Development (AJAD) - Call for papers!

Monitoring and Evaluation of Water Allocation in Huay Sone Irrigation Project, Naxaithong District, Vientiane Capital, Lao People's Democratic Republic

(Lao PDR), Master of Science in Irrigation Engineering (Kasetsart University)

Thesis Abstract:

 

The objective of this study was to use water allocation scheduling and monitoring (WASAM) 3.0 program to monitor and evaluate water allocation in Huay Sone Irrigation Project using the data of dry and wet seasons in 2005-2006. The study monitored crop cultivation on a weekly basis and calculated irrigation efficiency and delivery performance ratio.

The Huay Sone irrigation system supplied water to 3,000 rais (1 ha = 6.25 rais) in the wet season and 1,200 rais in the dry season. Two rainfall stations and three meteorological stations were used in the analysis. The monthly averages of reference crop evapotranspiration (ET0) were between 116 and 183 mm. Dry and wet season rice, and other crop were considered in the cropping pattern. Weekly weighted crop coefficients for rice in the dry and wet seasons were 0.10-1.21 and 0.09-1.10, respectively, while monthly weighted crop coefficient for the other crop was 0.8.

The water use recommended by WASAM 3.0 were close to the average actual delivery discharge since water supply from the storage reservoir was sufficient for crop water requirement. The results of water allocation monitoring in 2005 and 2006 indicated that the average irrigation efficiency of the project in the dry season was 58 and 57 percent, respectively, and in the wet season, 48 and 49 percent, respectively. The delivery performance ratios (DPR) of the project in the dry season were 1.49 and 1.25, respectively, and in the wet season, 1.25 and 1.3, respectively. This irrigation efficiency was fair compared with the irrigation projects in Lao PDR and northeast of Thailand. However, water management should be improved for more precise water delivery considering crop water requirement, effective rainfall, and planting area.