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Hezekiah's Tunnel
Two verses record that a water channel was cut. The channel itself has been surveyed, and it is the rare object in this book that can still be measured directly.
Reference: 2 Kings 20:20 · 2 Chronicles 32:30
The survey fixes length, straight-line distance and fall. It does not fix a mean cross-section, and that single unresolved value swings the headline tonnage by two thirds.