The Study on Methods for Setting of Water Quality Goal and Estimation of Allocation Loads on TMDL System Using a Dynamic Water Quality Model

In this study, the applicability of dynamic water quality model to TMDL system was examined, methods for setting of water quality goal and estimation of allocation loads were suggested and results of applying these methods were analyzed.HSPF model was applied for Miho stream basin as a dynamic water quality model.The model was calibrated using measurement data obtained in 2009~2010 and showed satisfactory performance in predicting daily variations of flow rate and BOD concentration.Methods for TMDL application were categorized into 3 cases; water quality management (1) considering low flow condition(Case I), (2) considering entire period of the year (Case II) and (3) considering the worst water quality condition (Case III).BOD water quality goals at the end of Miho stream watershed increased in the order of Case II Case I>Case III.If further researches on base precipitation and method for model input of nonpoint source pollutant were carried out, water quality could be managed more reasonably and scientifically by applying dynamic water quality model to TMDL.The result of this study is expected to be used as primary data for TMDL using dynamic water quality model.