[Lev]

So unless factually demonstrated otherwise, streams can be considered to be unguided.

How would we demonstrate 'guidedness'? If a stream follows the shape of letter S or something else sort of 'intelligent', do we say it's guided?

[Southack]

"How would we demonstrate 'guidedness'? If a stream follows the shape of letter S or something else sort of 'intelligent', do we say it's guided?"

No, if the stream is being guided by a fireman at a fire, then it is being intelligently directed/guided.

On the other hand, if no intelligent entity is controlling it, then it is unguided.