防洪堤坝不仅在河道洪水超过设计泄洪能力时才会发生防洪事故，水力因素的不确定性也会引起洪灾损失。
In flood control DAMS it is not only the failure to prevent flood larger than their design carrying capacity, but also the uncertainties of hydraulic factors that cause disasters.
他指出由水泥和泥土建造的应急防洪堤坝竖立在格里哈尔瓦河上，已经迅速隆起，有淹没该州首府比亚埃尔莫萨的威胁。
He pointed to emergency levees made of concrete and dirt erected on the banks of the Grijalva, which has swelled rapidly and threatens to flood the state capital, Villahermosa.
没有这项保证，筹募到的款项其实可能是转移自未来用于贫穷国家基础服务的开支，也就是将用作建造学校和医院的预算，改为兴筑防洪堤坝。
Without that, funds risk being raised by diverting future spending away from essential services in poor countries -taking money to build flood defences out of budgets to build schools and hospitals.
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