And I will make the rivers dry, and sell the land into the hand of the wicked: and I will make the land waste, and all that is therein, by the hand of strangers: I the LORD have spoken it.
I will make the rivers dry - I will dry up the artificial canals made from the Nile for irrigation. The drying up of these would cause scarcity of grain, and so prepare the way for the invaders (Isaiah 19:5-10).