灾级大小是将一次灾害中死亡、伤害和直接经济损失数折算成规范化指数后计算出来的。其方法简单易行，且适用性强。
It is calculated through the translation of casualty and direct loss into a normal index, which is a method of simplicity and applicability.
超过8万5千座水坝，其中有4000座都是不安全或者是有缺陷的，而4000座中有大约1800座都位于那些一次灾害就将造成惨重生命财产损失的地方。
Of the more than 85, 000 dams, more than 4, 000 are unsafe or deficient, and nearly 1, 800 of those are located where a breach would cause severe damage to life or property.
提前发出的洪水水位上涨警报防止了又一次的重大灾害。
Early warnings of rising water levels prevented another major catastrophe.
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