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钱塘江海涂围垦土堤,要在某一小潮汛5～7天期内,以数万人到十数万人突击完成。土堤不仅没有心墙、斜墙、反滤盖重等防渗防漏措施,且难以做到分层填土、分层夯碾。甚至留有明显的填土接界搭口。这种土堤极为疏松,土块架叠,空洞较多。当水位差达数十厘米时,就普遍出现漏洞,因此曾多次发生溃决垮堤事故。浙江省钱塘江工程管理局在总结群众围垦筑堤经验的基础上,对土堤防漏采用开沟灌水
Qiantang River reclamation embankment, to a small tidal flood 5 to 7 days, tens of thousands to hundreds of thousands of people assault completed. Embankment is not only no heart wall, inclined wall, filter cover and other anti-seepage Leakage measures, and difficult to do layered filling, layered ramming. Even leaving a clear filling junction interface. This earth embankment is extremely loose, soil blocks stacked, more hollow. When the water level difference of up to tens of centimeters, the general appearance of loopholes, it has repeatedly broken down collapse accident occurred. Zhejiang Qiantang River Engineering Authority summarized the masses of reclamation embankment based on the experience of the embankment leak ditching irrigation