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Base Flow Index Evaluation for Yom River, Thailand
Kanokporn Sawatpru
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DOI:10.17265/1934-7359/2023.10.006
Department of Agricultural Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand
The most controversial river in Thailand is the Yom River. It has not been modified by large dam because of several valuable natural resources. Therefore, the river is flooded in rainy season and very low flow in dry season. The low flow causes drought which is much more serious than flooding. The Yom River Basin management is only way to circumvent the low flow problem by studying base flow index (BFI). Base flow analyses for 8 gauging stations along the river were performed by 2 techniques i.e. graphical and modified U.K. Institute of Hydrology (MIH). The mean BFI results from graphical and MIH are 0.37 (0.05) and 0.45 (0.12). The result from graphical is more reasonable due to its lower standard deviation. BFI values from MIH vary with watershed area which may result from the using of fixing value of N-day at 10. Solution for this problem is ongoing in this study.
Base flow index, graphical method, low flow, MIH method.
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