For 3,700 years of Chinese records, the Yellow River failed to reach the sea only about ten times. Then, for three decades, it started failing almost every year — up to 180 days a year in the 1990s, 226 days in 1997 alone, with the dry riverbed reaching 700 km inland.

In 1999, a new water-allocation accord fixed it. By official account, the river has reached the sea every year since — a turnaround later honored with a global water prize.

But the historian who studied that accord most closely called it precarious "shortly after the ink dried." Groundwater beneath the plain it feeds is being pumped at two to three times what rain can replace. And a nearly identical "solved" declaration on a neighboring river collapsed within two years.

This is the story of a fix that worked — and the question nobody has tested since: what happens to it in the next serious drought.



Sources: David A. Pietz, "The Yellow River" · Ruth Mostern, "The Yellow River: A Natural and Unnatural History" · Liu Changming & Jun Xia, Hydrological Processes (2004) · Singapore International Water Week / Lee Kuan Yew Water Prize