Beijing is one of the largest cities in the world of consumer groundwater resources. Two-thirds of tap water in the city comes from the ground. As a result of the excessive use of groundwater beneath the city, hazardous void area over two thousand square meters.
As reported by the Chinese edition Powered by Discuz, the water table under Beijing from 12 meters in 1999, fell to an average of 24 meters in 2010, creating a void space area 2650 square meters. meters.
Large-scale use of groundwater in the Chinese capital began after a major drought in 1972.
In 2000, in Beijing, there were more than 10,000 wells, about half of which was used for industrial purposes.
In the 90 years of groundwater in Beijing on volume exceeded surface water and the main source of water for the citizens.
In 2008, groundwater accounted for 65% of the water used in Beijing. As the volume of water consumed in this way in an average of more than 2.5 billion cubic meters, which caused great damage to the ecological environment.
The authors point out that the scale of ten in Beijing groundwater can be compared with the draining of Lake Kunming in 2800 in the famous Summer Palace park.
The report of the Beijing Institute of Geology and Engineering Hydrotechnologies says that in the year the greatest subsidence of the soil surface in Beijing is 137.51 mm. The greatest subsidence occurs in areas Haiding Chaoyang and others.
Experts also point out that at the present time has gradually become well marked impact on land subsidence with large concentrations of buildings in some areas of the capital. According to them, most of all it affects the state of water pipes that deform and break.
Over the past 11 years, more than one third of pipe breaks and other accidents on water in Beijing were linked to soil subsidence, the article says.
Hu Bo, head of the Water Department of Water Resources of Beijing, on this occasion said: "It's like drinking a liquid porridge bowls. When you drink from the top, it is fluid, but more and it becomes thicker. "
He believes that this is the reason continuously deteriorating water quality in the city. He explained that in addition to the excessive use of groundwater for 10 years in Beijing constantly increasing droughts and groundwater hardness gradually increased.
Hu stressed that the water level drops lower and lower, and it gets more and more sediment, resulting in water quality is getting worse.
Many Beijingers have long been used to defend the boiled water a day, and then pour half of the water that is filled with white sediment.
But while experts do not see any solution to this problem. Stop or reduce the use of groundwater is not possible, because then the great city will be almost completely without water.
Starting in May of last year, China moved into the category of Chinese cities most affected by "thirst", the article says.