大坝老化问题委员会主席罗查说坝的失事接近1/100。美国的坝超过50,000座而n每年以1650座的速率增建新坝,安全问题就很突出。美国大坝委员会对4,918座高度超过14米的坝研究结果,注意到有349座有问题(7％),其中有74座失事(1.5％)。建于1850年至1930年间的坝约有16％有问题,而建于1930年之后的坝有4％发生过事故。事故的主要原因(30％)是渗漏。74座失事的坝中44％是由于管涌式渗 Rodathan, chairman of the Dams Aging Commission, said the dam’s accident was close to 1/100. With more than 50,000 dams in the United States and a new dam at 1650 a year, the security issue is outstanding. The American Commission on Dams observed the results of a study of 4,918 dams exceeding 14 meters in height, noting that there were 349 problems (7%), of which 74 were crashes (1.5%). About 16% of dams built between 1850 and 1930 had problems, while 4% of dams built after 1930 had an accident. The main reason for the accident (30%) is leakage. 44% of the 74 crashed dams were due to tube-infiltration