Water supply and drainage engineering studies the social circulation of water.
"Water supply" means that modern waterworks extract natural water from lakes and rivers every day, purify it into tap water that meets the production and domestic water standards through a series of physical and chemical means, and then transport the treated tap water to every household through the urban water supply network extending in all directions.
The meaning of "drainage" is that advanced sewage treatment plants concentrate the sewage and wastewater we have used in production and life, and then discharge them into rivers and lakes cleanly.
To sum up, the process of water intake, treatment, transportation, reprocessing and discharge is the main content to be studied in water supply and drainage engineering.
"Data inflation" the current situation of water supply and drainage in China;
With the rapid development of economy and science and technology in China, the construction of water supply and drainage system in China has made remarkable achievements, but there is still a long way to go to improve it. With the gradual acceleration of China's urbanization process and the further widening of the gap between urban and rural areas, as well as the intensification of a series of problems such as water shortage, water pollution and water quality deterioration, China's water supply and drainage development process is facing many challenges.
In the past few decades, with the further improvement of urban sewage treatment facilities, the improvement and invention of water supply and drainage facilities are gradually legalized and commercialized, and the cost compensation provided by the government to related enterprises is increasing, the water supply and drainage system in China has developed rapidly and its popularity has been continuously improved. During the 11th Five-Year Plan period (2006- 10), the investment in water supply and drainage technology in China quadrupled compared with the past, and sewage treatment fees were levied nationwide.
However, the development of water supply and drainage in China still has a long way to go. China, which has raised 20% of the world's population, only occupies 7% of the world's fresh water resources. According to the data released by the World Health Organization and UNICEF in the joint monitoring plan of water supply and sanitation, by 2008, the drinking water quality of about 6,543.8 billion people had not been improved well. During the same period, the basic sanitation facilities used by about 460 million people have not been further improved. The development of related projects in township areas also lags behind that in urban areas. According to the data of 20 15 joint monitoring program of water supply and sanitation, the sanitary conditions of 36% rural population have not been improved.