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Application and evaluation of ESWAT on the Dender basin and the Wister Lake basin

A computer program (ESWAT) was developed to perform integrated water quality modelling for river basins in order to assist water quality management planning and decision‐making. To describe the variabilities in water quality due to the climate, seasonalities and sub‐daily fluctuations, such a model should be able to generate long‐time output series on a sub‐daily basis. This is established by extending the existing program codes of SWAT. While SWAT enables long‐time simulations of agricultural pollution on a daily time step, ESWAT uses a time step of a user‐defined fraction of an hour and an hourly time step to calculate the rainfall/runoff and the in‐stream river routing processes, respectively. The hydrology part was further improved by including a convolution module and modifications of the evapotranspiration module of SWAT. A new module based on the QUAL2E concept was included to simulate the in‐stream water quality processes.