Isaiah 22:9

The first half reads Ye saw (i.e. examined) the breaches of the city of David (the citadel of Zion, 2 Samuel 5:7; 2 Samuel 5:9) for they were many. Jerusalem was evidently quite unfit to stand a siege. The water supply was still defective, as it had been 34 years before (see ch. Isaiah 7:3). The lower poolis not elsewhere mentioned, although its existence is implied by ch. Isaiah 7:3. It was obviously within the walls, and probably lay near the mouth of the Tyropœon Valley.