What does Weikou mean?

Generally, the area enclosed by dikes and high terrain is called Weikou. Because of the low-lying terrain, a dike was built along the river to prevent the flood from pouring into the outer river. At the same time, in order to discharge the water energy in the weikou in rainy season, a pumping station (machine row) and a self-discharging culvert gate are set up at the dike.

The polder mouth is surrounded by dikes, and sluices and pumping stations are set up to prevent floods from the outside and eliminate waterlogging from the inside, thus forming a closed flood control and drainage protection area. The polder area is flat and low-lying, and the water level is low during the flood period, so it is prone to floods.

Extended information

The polder originated in the pre-Qin period, when wuyue was at war, and Wu built a city in Gucheng (now Gaochun, Jiangsu Province) and surrounded the lake as a field, which was the earliest polder in Taihu Lake area. Sun Wu of the Three Kingdoms built polder to fill the army's needs, and set up a captain to take charge of it, which was the beginning of building polder along the river in Anhui. From the late Southern Song Dynasty to the Yuan Dynasty, polder fields began to rise in the two lakes and Jiangling and Jingmen areas in the west of Jianghan. That is to say, the polder expanded from the lower reaches of the Yangtze River to the middle reaches, followed by Taihu Lake area, Jianghuai area and Hanjiang River basin.

the development of polder land is inseparable from the unique local geographical conditions. The area where the polder is located is usually rich in water resources; There are many lakes, dense water networks, and rivers and seas, which are convenient for water transportation; Mild temperature, long frost-free period, fertile land, suitable for crop growth, suitable for human production and life.