The Psalmist asks for our fortunes to be restored "like watercourses in the Negeb." His first readers would have known what a lavish gift he was asking for.
In the desert region of the Negeb, creek beds were almost always dry. But, when the rains came, they were rushing rivers. If you knew the central Texas of my childhood, you would be familiar with what we called a gully, a wash, or an arroyo.
Imagine now a shallow depression in the desert. That's what you've got. Dust. Now, imagine, a heavy rain.
Despair followed by joy.
Lectio Divina: Psalm 126:3-6