The formation of the runoff is very complex, the atmosphere by rainfall, surface factors and the impact of human activities, in karst areas,watershed hydrology, topography complex structure, in addition to climatic conditions, there are factors underlying surface of the basin, and Basin, with an uneven moisture content of soluble double medium structure, three-dimensional geographical structure, the dynamics of space basin, watershed boundaries, such as the opening of the characteristics of this complex hydrological system, the people on the Karst Valley runoff characteristics, revealed the Karst Valley Hydrological law is particularly complex.

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