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The hydrological models have been invented by using principle of hydrology and mathematical model. Currently, there are several types of hydrological model. The hydrological models are important equipment for research and working in water resources engineering. The objective of this study to assess a performance of semi-distributed model for runoff simulation in Upper Yom River basin, which located in north of Thailand and suffer frequent floods. The hydrological models included in the study are KW-GIUH and BTOPMC model, which are semi-distributed model that use geological data to define the physical characteristics of sub-watershed and rainfall from storm event for runoff simulation. For assessing the model performance, the results of the calibration and validation method of the two models were investigated by comparing with the discharge data from observation stations and using the Nash-Sutcliffe model efficiency coefficient to assess the model performance. Then, the performances of both models are compared in order to identify the appropriate hydrological model for the situation with high precision. The results revealed that both model can be simulated hourly runoff in Upper Yom River basin satisfactory. The NSE are higher than 0.75, but KW-GIUH has a slightly better performance than BTOPMC.
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