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900-year-old drainage system saves Chinese city from flooding

900-year-old drains built during the Song Dynasty have proven far more effective than modern sewer systems in dealing with heavy flooding in the Chinese city of Ganzhou. Two long tunnels, built using bricks from the city walls, cross the city and channel floodwater into two ponds that function as reservoirs.

2,000-year-old Roman bath drain in Britain to be explored

Britain's oldest bath overflow, the Great Drain, is to be explored for the first time. For two millennia the Great Drain has carried the mineral-rich waters of Britain’s only hot spring from the Roman Bath in Bath to the nearby River Avon. The drain runs for nearly half a mile under

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