The whole of the original is well worth reading.

"From the city's inception, its lifeline of water depended solely on hidden wells and
underground cisterns. Fed by underground streams, the Gihon Spring on Jerusalem's
eastern slope was the ancient city's only source of water at that end. Depending on die
season, die spring could supply water to the city once or of time. The Gihon also irrigated the
surrounding fields and gardens through several open canals along what is known as the
Kidron riverbed. "

"About the late 8th Century B.C., King Hezekiel of Judah authorized the excavation of a new
tunnel even further away to access water to the city, store the supply in an underground
pool, and hide the entrance of the spring. In his attempt to thwart a possible Assyrian siege
of the city, the tunnel would become one of the earliest examples of daring engineering
feats. "