“发洪水”的英语可以翻译为：[医]Flooding ...

发洪水期间，汉格巷地下通道被关闭。The Hanger Lane underpass was closed through flooding.发洪水时很多人淹死了.Many people drowned in the great floods.这条河正在发洪水, 那个游泳的人陷入了困境.The river was in a high flood, the swimmer got into difficulty....