downpour

n. 倾盆大雨

A deep ditch or channel cut in the earth by running water after a prolonged downpour.

隘谷，冲沟长期的倾盆大雨冲击地面之后形成深的沟壑或沟渠

The rescue work had been going very well until a sudden downpour loused the whole thing up.

营救工作本来一直进行得很顺利，后来突然下了一场倾盆大雨，把整个事情弄得一团糟。