Here are some other words for running water, depending on the specific context:
General terms:
Flowing water
Moving water
Current
Stream
River
Creek
Brook
Rill (a very small stream)
More poetic/evocative terms:
Flume
Cascade
Torrent
Rapids
Undulation
Technical/scientific terms:
Discharge
Effluent
Runoff
The best word to use will depend on the specific nuance you want to convey.
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