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Biblical kings in Jerusalem built monumental dam, maybe to deal with climate change

The dam, built to manage water during climate challenges, measures up to 12 meters high and 21 meters long, marking Jerusalem's earliest and largest ancient water engineering feat.

  • Archaeologists fully excavated a monumental dam at the Siloam Pool in East Jerusalem's City of David between 2023 and 2024.
  • Archaeological research indicates that a large dam in Jerusalem was constructed around 800 BCE during the rule of either King Joash or his successor Amaziah, likely as a strategic response to severe environmental challenges such as drought and flooding.
  • This enormous dam, stretching roughly 21 meters in length and measuring more than 8 meters across and about 12 meters in height, was constructed to channel water from the Gihon Spring along with floodwaters from the ancient Tyropoeon Valley into the Kidron Stream.
  • The excavation leaders emphasized the dam's impressive size, noting it stands approximately 12 meters tall, spans more than 8 meters in width, and extends at least 21 meters in uncovered length.
  • The discovery offers new insights into Jerusalem’s early urban planning and the ingenuity of Judah's kings to manage water amid climatic challenges about 2,800 years ago.
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Haaretz broke the news in Tel Aviv-Yafo, Israel on Monday, August 25, 2025.
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