1, water resources endowment is congenitally insufficient.
Since 1999, Beijing has been suffering from drought for many years, with an average annual rainfall of 480mm. The average annual inflow of Miyun Reservoir is 270 million cubic meters, which is 28% of the average for many years. The average inflow of Guanting Reservoir for many years is 65.438+0.3 billion cubic meters, which is 654.38+0.4% of the average for many years, and the average water resources for many years is about 26.5438+0 billion cubic meters.
2. Rapid population growth and rapid urban development.
With the rapid development of cities and the rapid growth of population, the demand for water in economic and social development is increasing rigidly, which leads to the increasing demand for water resources.
3. Environmental deterioration, lack of awareness of water conservation.
The population of Beijing is growing too fast, and the water is wasted. The per capita domestic water consumption is 2 10L/ day, which is much higher than the global average daily water consumption 170 l. Although water-saving work is being carried out one after another, there is still a clear gap between the actual effect and water-saving areas such as Israel and Singapore. Water saving is more of a propaganda slogan, and it has not really penetrated into the daily behavior of citizens.
The increasingly serious water pollution not only reduces the use function of water bodies, but also further aggravates the contradiction of water resources shortage.
Extended data
Present situation of water resources in China
The total water resources in China is 2.8 trillion m? , ranked fifth in the world. China's total water consumption in 20 14 was 609.49 billion cubic meters, ranking second in the world after India. Due to the large population, the per capita water resources are only 21000 m? About 28% of the world average.
In addition, China belongs to monsoon climate, with uneven distribution of water resources in time and space, and great differences in natural environment between north and south. Among them, the per capita water resources in the nine northern provinces are less than 500 cubic meters, which is a water-deficient area; Especially, the rapid increase of urban population, the deterioration of ecological environment, the backwardness of industrial and agricultural water technology, waste and serious water pollution have made the already poor water "worse" and become the bottleneck of national economic construction and development.
Among more than 600 cities in China, more than 400 cities have water shortage problems, among which the cities with severe water shortage 1 10, and the total water shortage of cities in China is 6 billion cubic meters.