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在美国,一些在建堤坝施工时下沉,也有一些已建堤坝必须加高,以防遭受可能发生的洪水漫坝或承受加大了的地震标准。小型土坝更是这样,因为根据判断,它们在溢洪道的泄流能力不够,不能调蓄或通过安全洪水。按现行规范,它们应该承受最少50%最大可能洪水(PMF)。在多数情况下应该承受100%PMF。由于现场条件的限制或经济问题,要加高
In the United States, some sink during the construction of dykes and some have built dikes that must be raised to prevent flood catastrophic floods or undergoing increased seismic standards. This is even more so for small earth dams because, according to their judgment, they have not been able to discharge enough of the spillways and can not regulate or pass safety floods. According to current regulations, they should withstand at least 50% of the maximum possible flooding (PMF). In most cases should bear 100% PMF. Due to site conditions or economic issues, to increase