General situationChina is rich in water power resources.The theoretical valueamounts to 6.76x105 MW,among which attainable exploitable waterpower resources is 3.78×10~5 MW.The comprehensive utilization ofwater power in China is an age-old tradition.The ancient agriculturalmechanical devices,such as hydraulic pestle mills in South Chinaand huge irrigation wheels erected along the banks of Yellow River inGansu Province remain unchanged as legacies of history.But theutilization of her rich water power resources for electric energy gen-eration had not come true until last tens of years.Before the founding of the People’s Republic of China,therewere only 50 odd small hydro electric power stations,with total in-
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