How dams built by China starve the Mekong River Delta of vital sediment

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How dams built by China starve the Mekong River Delta of vital sediment
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Standing on the bank of the Mekong River, Tran Van Cung can see his rice farm wash away before his very eyes. The paddy's edge is crumbling into the delta.

Just 15 years ago, Southeast Asia's longest river carried some 143 million tonnes of sediment – as heavy as about 430 Empire State Buildings – through to the Mekong River Delta every year, dumping nutrients along riverbanks essential to keeping tens of thousands of farms like Cung's intact and productive.

"The river is not bringing sediment, the soil is salinised," said Cung, 60, who has grown rice at his family's 10-hectare farm for more than 40 years. China's foreign ministry said the country accounted for only a fifth of the total Mekong basin area and only 13.5% of the water flowing out of the Mekong's estuary, adding that there was already a "scientific consensus" on the impact of China's upstream dams. The ministry did not address the slide in sediment levels or the role of Chinese dams in that decline.

The area under rice farming has shrunk by 5% in the last five years alone, with many forced to adopt shrimp farming in salty seawater as an alternative. Another 11 dams have gone up since 1995 on the main river itself in China – including five mega-dams each standing more than 100 metres tall – while China has helped to build two in Laos.

The satellite images for the Mekong analysis date back to the 1990s, which "allows us to calculate turbidity levels before many of the dams were built," said EOMAP data analyst Philipp Bauer. After the dam was completed in 2012, average turbidity at the same spot plummeted 98% to just 2.38 NTUs - clear enough to meet the World Health Organization's classification for drinking water.

Governments of other countries through which the Mekong flows also did not respond to requests for comment.At Cung's rice farm in Vietnam, riverbank seedlings have little time to take root before they fall into the water as the banks give way.

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