一个ChannelEvent事件可以既是一个上升流事件（upstream event）也可以是一个下降流事件（downstream event），这取决于事件流的方向。
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It will push SMS messages to people downstream of a flood event giving them up to 24 hours advanced warning.
利用短信为洪水下游提供长达24小时的提前预警。
The Department has been informed that one or both of the DAMS partially failed during a recent rain event, causing debris and flooding at downstream locations.
我们部门收到通知，最近雨势由于强烈，木坝的一些地方爆破，在下游地方造成木屑堆积和洪灾。
For those downstream, they protect the space from dam crest to draining prism or to dam heel in event of no prism.
下游面则由坝顶护至排水棱体，无排水棱体时则护至坝脚。
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