Tuesday, April 30, 2013

China's Disappearing Rivers

The Atlantic:
As recently as 20 years ago, there were an estimated 50,000 rivers in China, each covering a flow area of at least 60 square miles. But now, according to China's First National Census of Water, more than 28,000 of these rivers are missing. To put this number into context, China's lost rivers are almost equivalent, in terms of basin area, to the United States losing the entire Mississippi River.
Why have these rivers "vanished" from the maps and national records?
Official explanations from the Chinese government have attributed the significant reduction to statistical discrepancies, water and soil loss, and climate change...
The past 30 years in which these rivers vanished have coincided with a phase of rapid industrialization and urban growth in China. From 1990 to 2000, urban areas expanded by more than 5,000 square miles, an area the size of Puerto Rico, and the expanding economy has correspondingly strained water and energy resources. In Yale University's 2012 Environmental Performance Index, China is one of the worst performers (ranked 116 out of 132 countries) with respect to its performance on changes in water quantity due to consumption, including industrial, agricultural, and household uses.
Poor management of water resources has also exacerbated the situation. The main water resource law in China only requires permits for groundwater extractions for "large-scale" projects. The lack of specificity in this language has led to what Gleick says is substantial overdraft of groundwater throughout the country. Weak water governance also caused last September's red water flow in to the Yangtze River, an occurrence that left even Chinese officials perplexed.
What about the statistical discrepancies that the government says could have factored in to the rivers' disappearance? While some updates to river classification are plausible, cartography and mapping techniques have been very sophisticated in China for many years. One user on Sina Weibo tweeted an old map of waterways for Qingdao, showing abundant waterways in considerable detail. The maps are accurate and Qingdao's rivers have not been wiped away by "improved surveying methods" -- they have simply been converted into Qingdao's sprawling roadways, said one of the city's urban historians.
China is an ecological train wreck.  Its economy is going to crash down under its own weight.

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