What is the ruling on selling flowing water not originating on private property, such as large rivers?

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Flowing water not originating on private land, such as large rivers, can never be owned. If it flows onto a person's land, the landowner does not gain ownership merely by its presence, similar to how a bird entering their land does not become their property. Anyone may take it. Ownership is established only if the person creates a stationary source, like a pond ('baraka') or basin, or digs a channel to divert water from the main river into it, granting them superior right to that diverted water, similar to the retained water of a well.