The ice blocks up the river, making the upstream water unable to flow.

冰把河道堵住了，上游的水流不下来。

youdao

Reporters across the Silver Bridge to later see in the upstream water is indeed very clear.

记者在跨过银溪桥后见到，上游的水的确很清。

youdao

With the upstream water level reducing and the downstream water level increasing, the highest tangent velocity also moving to the pipe center.

随上游水位的降低及下游水位的升高，切向流速最大值点也不断向管中心一侧移动。

youdao

Water quality issues also create risk for companies, from stricter pollution standards on their own effluent to other entities polluting water upstream, requiring them to clean up water prior to use.

FORBES: A New Tool To Manage Companies' Growing Water Risks

The Aral Sea was dried up by upstream diversions of water for vast areas of irrigation.

ECONOMIST: Letters

Further complicating the matter is the use of river water upstream for agricultural irrigation.

ECONOMIST: Saving the fish of the Klamath river