Yellow River Xiaohuajian Rainstorm and Flood Forecast System recently was completed in general designing after one year of hard work of the Yellow River Water Resource Committee. It passed through the appraisal that the Ministry of Water Resources organized recently in Beijing. It has the important significance for the flood prevention in the lower reaches of Yellow River and for the safety and health of 1.7 million populations. After 1949 the founding of the People's Republic of China, the controlled reservoir projects of Sanmen Gorge, Xiaolangdi, Luhun and Guxian were established. Now flood in the upper reaches of the four reservoirs was basically controlled...