'Riverbeds' in the Bible

My brothers have been as treacherous as a seasonal stream, and as the riverbeds of the intermittent streams that flow away.

And in that dayThe mountains will drip with sweet wineAnd the hills will flow with milk;And all the brooks and riverbeds of Judah will flow with water,And a fountain will go out from the house of the LordTo water the [desert] Valley of Shittim.