Tag Archives: water management

Shanghai Becomes More Like Venice, In A Bad Way

So serious has the depletion of China’s groundwater become as a result of industrialization and urbanization that the country’s large cities are sinking, as, potentially, are the high-speed rail corridors between them. So concerning is that to authorities that the State Council has made areas with high-speed rail links a priority in a new land subsidence research project it has approved to be completed by 2015. In the order of these things, that is a crash deadline.

The survey is one of four projects that the Ministry of Land and Resources said this week that the State Council had ratified to combat the effects of China’s growing water shortage. Others include yet more controls on pumping underground water, and the setting up of monitoring networks in the worst affected areas–the Yangtze river delta, the North China Plain and the Fen and Hua river basins. The network is to be in place by 2020.

It didn’t take any technology to see the 8 meter crack that opened up earlier this month in a road near the Shanghai World Financial Center. (There are some pictures here.) That is despite authorities taking preventive measures since 2005 to combat ground subsidence caused by falling water tables. Municipal officials say the city is still sinking by seven millimeters a year. That is a better state of affairs than in the past, however. Shanghai used to be sinking by several centimeters a year.

A third of China’s water reserves lie in underground aquifers. They supply 70% of the country’s drinking water and 40% of its farm irrigation needs. They are being stretched to their limits, particularly across the grain belt of the North China Plain as evermore wells are sunk to draw water for city dwellers and industry. Underground water pollution is a separate concern, but as serious.

Shanghai is one of more than 50 large cities with a similar Venice-like problem of subsidence because the water table below it is sinking. Beijing, Tianjin, Hangzhou and Xian are among others. As the number of 50 cities has been quoted since at least 2006, we suspect it may undercount the problem today. In a paper the China Geological Survey published that year the direct economic cost of subsidence was put at 1 billion yuan ($160 million) a year. It will likely top that now.

Tianjin, which like Shanghai has been sinking since the 1920s although it wasn’t until the 1960s that it was understood why, shows why widespread limits on groundwater pumping are so urgent, and also how difficult it is to control subsidence. The city introduced restrictions as long ago as 1985. Its sinking has slowed from 80 millimeters a year then but is still dropping 20 millimeters a year now. Coastal cities share another characteristic with Venice. Floods are becoming more frequent and severe. The lower cities sink the more susceptible they are to them.

We have noted before the potential explosive social costs of a water crisis getting beyond the government’s control. It will take a comprehensive program of water conservation, better water resource management and better husbandry of the ecosystem. And there are plans on all those fronts. But if they fail, it will be more than a high-speed train or two that comes off the rails.

 

 

3 Comments

Filed under Environment

Ever More Arid China

A villager walks on the cracked croplands in Pingman Village of Tianlin County, south China's Guangxi Zhuang Autonomous Region, Sept. 7, 2011.The most difficult natural resource for a country short of it to acquire is the one most vital to life: water. Nature has not dealt China a good hand. It has a fifth of the world’s population but only a fifteenth of its fresh water. But it has played a poor hand badly. And unlike, say soya beans, iron ore or any other commodity for which rising prosperity is increasing demand beyond the country’s capacity to supply, China can’t just ship in water from distant lands.

How seriously short of water China has become was emphasized again this week by Hu Siyi, vice-minister of water resources. Even though China consumes more than 600 billion cubic meters of water a year, that is more than 50 billion cubic meters less than it needs. To put a more human face on the shortfall, nearly 300 million rural residents lack access to safe drinking water. Two-thirds of Chinese cities are ‘water-needy’, to use Hu’s phrase, which seems to be a marked worsening of the situation from last November when a State Council announcement of a 10-year drought-alleviation plan said 110 out of China’s 658 cities had suffered from water shortages. Meanwhile, two in five Chinese rivers are seriously polluted and unfit for drinking because sewage and waste water has been discharged into them. One in five is so polluted it is rated Category 5 on a scale of 1-5 for water quality. Category 5 means too toxic even to touch.

Rapid industrialization and urbanization has driven both the shortages and degradation of the water supply compounded by climate change. Drought in the wheat belt on the North China Plain has become all but the norm, leading to growing concern about grain supply. At the northeastern end of the plain, the capital’s growing thirst only compounds the problem. Last summer’s persistent drought in southwestern China left 14 million people short of drinking water, damaged millions of hectares of farmland and left industry short of power after river levels fell too low to drive hydroelectric power generation plants. This week, more than 3 million people are short of water because of the drought lingering in Yunnan and other ones in Jiangxi and Inner Mongolia.

An international spotlight has fallen on the shriveling of  Poyang Lake, China’s largest freshwater lake, home to the rare finless porpoise and winter home for hundreds of thousands of migratory birds including the Siberian crane which have traditionally depended just as much on the lake’s dwindling fish stocks as Poyang’s increasingly unemployed human fishermen. Yet its story is not uncommon. Fifty years ago China had half as many natural lakes again as it does today. Two thirds of those that have survived are chemically polluted. That is scarcely a better fate than the hundreds of smaller lakes along the Yangtze basin that have dried out completely or been drained for farmland and housing.

Hu acknowledges that water shortages, serious river and lake pollution and the deteriorating aquatic ecology threaten the country’s sustainable growth. Such a disruption to the country’s economic and social development would pose a direct threat to the Party legitimacy to rule, hence the gravity with which it is being taken at the highest levels of government. “We must put in place the strictest water resources management system,” Hu says.

New guidelines cap national water consumption at 670 billion cubic meters by 2020, and 700 billion cubic meters by 2030, with compulsory measures to enforce them and a system of water-use licenses to be introduced. It will be a tough target to meet, even with the help of 4 trillion yuan ($635 billion) designated for water conservation projects during the current five-year plan, which calls for a repeat of the 20% reduction in water consumption per unit of output achieved under the previous plan. The long-term goal is to reduce water consumption per unit of output by 60% from 2005 levels.

Strict water resources management also means reining in the untrammeled provincial hyrdo-dam building and urban water diversion projects, as well as taking greater control over local drilling into deep aquifers, a short-term solution that will cause long-term problems as it is tapping the reservoirs of last resort. This is a particular issue on the North China Plain. On top of that, Beijing will have to enforce existing environmental protections and good water management policies, which often get brushed aside by local officials for whom promoting economic growth is the priority and a river or lake seen as little more than a self-cleaning sewer for industry that they don’t have to build. Step one will be to end the fragmentation of water management among various ministries and levels of government. Beijing will also have to promote the reuse and recycling of urban water, improve irrigation methods in the countryside (farmers use 85% of China’s water), end water subsidies and make industry less wasteful users of water. International companies like Siemens and GE see big potential business in all this.

China remains a water hog even by BRICS’ standards and the economy is still growing fast enough for it to be a perpetual race to keep up. Yet so unsustainable is the current demand for water, if Beijing doesn’t deal with the crisis, it faces the prospect of water civil wars as farmers, city dwellers and industry fight for who gets what water there is in China. In 2004, the World Bank warned of the possibility of tens of thousands of environmental internal refugees, fleeing the increasingly arid North China Plain, which has 42% of China’s population but only 8% of its water. Hu’s latest comments suggest the prospect is now not that far-fetched.

7 Comments

Filed under Environment

New Wells Alone Insufficient To Solve North China Plain’s Old Problem

Drought-stricken provinces of North China Plain

Beijing’s plan to sink 1,350 wells across the North China Plain (see map, right) to alleviate the drought in the country’s wheat belt that has persisted since October is a sticking-plaster not a cure. We don’t yet know the details of the proposed drilling, but it is a fair bet that the wells will have to drop to the deep aquifer. The plain’s water table has been shrinking for years under the onslaught of desertification, urbanization and industrialization, compounded by periodic droughts. The result has been to make the plain increasingly arid as the water table has been unable to replenish itself adequately. Drawing water from the deep aquifer is equivalent to a pensioner dipping into their capital once the interest from it becomes too small to live off.

The North China Plain needs a modern irrigation system and a comprehensive water conservation policy that encompasses both the wheat lands and the water-hogging cities on the plain, notably Beijing and Tianjin. Beijing has plans, including grand plans, and has recently been throwing money at emergency drought alleviation and making water conservation a policy priority as the leadership gets evermore anxious about the grain supply. But it is all too reactive. For a country that prides itself on its central planning, its water management has been weak.

Governments often suspend the laws of economics when it comes to agriculture because of national food security concerns and a desire to support rural communities. There are plenty examples around the world of governments spending vast sums of money on irrigation schemes to turn deserts green. Yet this Bystander is starting to wonder if policymakers should be starting to think the unthinkable: at what point does watering the North China Plain start to become just too expensive, and a new sort of agriculture become needed.

2 Comments

Filed under Environment