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德·梅洛教授在第十七届纪念兰金大会上(土工学——1977年9月举行)讲到“坝工建筑的保坝防洪措施的投资相当大,其设计涉及到极限理论的应用”,他认为“随着时间的推移,大多数区域的水文气象条件已发生变化”,又说,“如果真的启动闸门渲泄特大洪水,提高溢洪道工程造价的结果,势必增加新建坝工程的投资,更不必说开发下游费用的大幅度增加了”。“水库调洪演算,增大洪水超高和防洪库容”进而导致“造价低廉的自溃式溢洪道的出现,使发生溃坝事故造成重大损失的可能性大为减小”。在美洲,人们把这种溢洪道叫做“自溃式溢洪道”,而印度称之为“可冲坝段”。
Professor de Mello at the seventeenth commemorative Rankin conference (geotechnical - held in September 1977) said that “dam construction dam flood control investment is quite large, the design involves the application of limit theory ”He said.“ Over time, the hydro-meteorological conditions in most regions have changed, ”adding:“ If we really start the floodgates and increase the cost of spillway projects, it is bound to increase the investment in new dam projects Not to mention the drastic increase in downstream costs of development. ” “Reservoir flood regulation, increasing floods and flood control capacity,” which in turn led to “the emergence of low-cost self-collapsing spillway, greatly reducing the possibility of causing major losses in the event of a dam failure.” In the Americas, this type of spillway is called a “self-defeating spillway,” while India calls it “Okabe Dam.”