It was Hezekiah who stopped the upper outlet of the waters of Gihon and directed them to the west side of the city of David. And Hezekiah prospered in all that he did.

Now after this he built the outer wall of the city of David on the west side of Gihon, in the valley, even to the entrance of the Fish Gate; and he encircled the Ophel with it and made it very high. Then he put army commanders in all the fortified cities of Judah.