Daily Stream Flow Simulation in a Data-Poor Basin

Rainfall-runoff modeling is one of the keystones of scientific hydrology and environmental management. Therefore the researchers continuously try to find new approaches for improvement of existing models or modeling methodologies. In this paper, daily stream flow at the outlet of a watershed in southwestern Iran was simulated using a conceptual continuous rainfall-runoff model. In encountering with the problem of poor quality data, required data such as runoff, rainfall and PET were prepared using a specific approach. The results showed that the Nash-Sutcliffe efficiency was 0.80 and the coefficient of determination was 0.82 during calibration and the Nash-Sutcliffe efficiency was 0.83 and the coefficient of determination was 0.83 during validation. Furthermore statistics of observed stream flow were preserved in simulated stream flow. The results showed that this approach is successfully applicable for daily rainfall-runoff modeling when the quality of the input data is not adequat.