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Rainfall Time Distribution over the Wuliangsuhai Eastern River Basin

The 25 years of rainfall data in Wuliangsuhai eastern river basin from 1986 to 2010 are summarized and analyzed based on two statistical methods. The two statistical methods named moving average method and Cumulative Departure Curve are applied to make a conclusion that the rainfall in 25 years has a downward trend and the rate of change become high in new century.