Assertion: river's flow | /r/HasProperty | backup
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Source sentences:
text: There is no clear demarcation between surface runoff and an ephemeral stream,:58 and some ephemeral streams can be classed as intermittent—flow all but disappearing in the normal course of seasons but ample flow (backups) restoring stream presence—such circumstances are documented when stream beds have opened up a path into mines or other underground chambers.