Evaluation of Runoff in the Upper-Chi and Lumsapung Basins using Hydrologic Model and Mathematical SWAT Model
doi: 10.14456/mijet.2019.7
Keywords:
Total runoff, SWAT model, SCS-CN, Rational Method, Rainfall Runoff ModelAbstract
Runoff evaluation can be done in several ways ranging from traditional basic hydrological methods to mathematical models with computer programs. Each method has different conditions and limitations, such as hydrological methods which use simple calculation process and only a few parameters, but may give less accuracy results than the mathematical model that requires more input data and more complex preparing parameters as well as more parameters for calibration steps. Therefore, this study aims to apply basic hydrological methods for evaluating total-runoff to provide acceptable results as close as the target mathematical model. The study areas were in Upper-Chi River basin and Lamsapung basin, Thailand. The proportions or relationships in the new forms of CN' and C' from the basic SCS-CN and Rational methods respectively were created. The new forms could be used as representative variables for evaluating run-off and giving accepted results close to the results of mathematical model (SWAT model). The results showed that all 3 methods could be used to evaluate the total runoff with good results. Furthermore, the new variables of CN' and C' which represented variables for evaluating the total-runoff with SCS-CN and Rational methods provided acceptable results in the forms of monthly values.
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