It shall come to pass, when the soles of the feet of the priests who bear the ark of Yahweh, the Lord of all the earth, shall rest in the waters of the Jordan, that the waters of the Jordan shall be cut off, even the waters that come down from above; and they shall stand in one heap.
"The waters shall be cut off ... the waters that come down from above ..."  This simply meant that the waters upstream would suddenly cease to flow by Israel's position.