2 Kings 20:20 details Hezekiah's water tunnel and pool, the very water works Isaiah 22:9 says they gathered — a direct historical parallel.

2 Chronicles 32:1-6 describes Hezekiah's siege preparations including securing water supply, exactly the situation Isaiah 22:9 observes.

2 Chronicles 32:30 specifically mentions Hezekiah channeling water into the city, matching the gathering of waters in Isaiah 22:9.

2 Kings 18:17 places the Assyrian envoy at the conduit of the upper pool, the same water system Isaiah 22:9 says they gathered — strong link.

In 2 Chronicles 32:5, Hezekiah's wall repairs and fortifications are the same historical event behind these preparations.

In Nahum 3:14, a similar call to prepare water for siege appears, but directed against Nineveh instead of Jerusalem.