Based on the digital elevation model data and the river network extracted using geographic information system, the DEM-based distributed rainfall-runoff model (DDRM) is built for the Wujiang basin and its parameters are calibrated by the SCE-UA optimization algorithm. The simulation performance of DDRM is evaluated by both the Nash-Sutcliffe Efficiency and the relative error of runoff depth and then compared to that of the Xinanjiang model. The results show that on the premise that the consistency of hydrological data is not destroyed, DDRM can achieve a better performance than the Xinanjiang model in simulating the runoff process. In addition to simulating the runoff process at the outlet of the watershed, DDRM can also simulate the spatial distribution within the basin of both the soil moisture and runoff at any time. For its simple structure and parsimonious parameters, DDRM has great application potential in humid basins.
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