Charles Ellicott Commentary 2 Chronicles 32:4

"So there was gathered much people together, and they stopped all the fountains, and the brook that flowed through the midst of the land, saying, Why should the kings of Assyria come, and find much water?" — 2 Chronicles 32:4 (ASV)

The fountains. — Ma‘yânôth. 2 Chronicles 32:3 has “springs” (‘ayânôth).

The brook. — Nàchal. “The wâdy.” The Gihon is meant, a watercourse in the Valley of Hinnom, supplied with water by the springs which Hezekiah closed in and diverted. See Note on 2 Chronicles 32:30, and 2 Kings 20:20. Compare to Sirach 48:17, “Hezekiah fortified his city, and brought into their midst the Gog” (Septuagint, Vatican manuscript), or, “into its midst water” (Septuagint, Alexandrian manuscript).

That ran. — That was flowing over (Isaiah 30:28; Isaiah 8:8). The overflow of the springs formed the stream.

The kings of Assyria. — A vague rhetorical plural, as in 2 Chronicles 28:16.