Hezekiah dammed up the source of the waters of the Upper Gihon and directed them down to the west side of the City of David. Hezekiah succeeded in all that he did.

After this Manasseh built up the outer wall of the City of David on the west side of the Gihon in the valley to the entrance of the Fish Gate and all around the terrace; he made it much higher. He placed army officers in all the fortified cities in Judah.