South Lake, named after its location in the south of Wuchang, is a freshwater lake formed by river siltation. Located in the southeast of Wuchang, it is bordered by East Lake and Husha Lake in the north and Tangxun Lake and Huangjia Lake in the south, belonging to a transboundary lake. There are five universities around Nanhu Lake (Huazhong Agricultural University, Hubei University of Technology, South-Central University for Nationalities, Wuhan University of Technology and Zhongnan University of Economics and Law).

Geographical coordinates: east longitude114 22'13 ",north latitude 30 29' 20". The control area of Nanhu Blue Line is 7.67 kilometers? , the catchment area is 39.35 km? The coastline is 23.0 kilometers long, with an average water depth of 2.7 meters for many years, a maximum water depth of 3.3 meters and a lake capacity of 20.523 million cubic meters. The planned normal water level of Nanhu Lake18.65m, and the planned high water level19.65m. ..

Causes of poor water quality in Nanhu Lake

First of all, the progress of sewage interception and remediation in Nanhu sewage outlet is seriously lagging behind, and the rain and sewage diversion rate is low. There is still a lot of domestic sewage in the sewage outlet around the lake. Although some sewage outlets (gates) have built intercepting dams (gates), a large amount of domestic sewage still overflows and discharges directly.

Secondly, the buildings around Nanhu Lake are developing too fast. Nanhu Lake is one of the four comprehensive groups in Wuchang, with a planned land area of 22.5 square kilometers. It will be an important sub-center of Wuhan in the future, with a planned residential population of 1 1- 1.5 million and a radiation population of 350,000. In just ten years, the population has reached 600 thousand.

Third, South Lake is low-lying. Before development, it was a water area, a pond with a large water depth. It is easy to accumulate water and become a sink, and pollutants are easy to gather here with water.

Fourthly, the reclamation around the lake leads to the reduction of the lake area, the obvious reduction of the self-purification ability and the weakening of the function of the lake. As the saying goes: running water does not rot. It is difficult to flow outside the South Lake, and the pollution is fast.

Reference to the above content: Baidu Encyclopedia-Nanhu