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In 1958, Jerusalem inaugurated a new water reservoir, thus assuring the Jewish holy city of an adequate water supply for the first time in its 3,000-year history. Jerusalem's shortage of water was long its weakness in time of military siege. Back in the days of King David, a tunnel had been dug from the Old City to a neighboring valley, to channel water inside the Old City Walls. In modern times, the problem was exacerbated in 1948 when the Arab blockade of Jerusalem left its residents without a water supply.