Lianjiang, a river in the South China Sea. There are 17 tributaries that flow into the main stream from north to south. The total length of the main stream is 7 1km, and the drainage area is 1, 346.6km2 It is named after the meandering river. The annual average runoff depth of Lianjiang River is 1 156 mm, and the annual average runoff is 587.4 million cubic meters. The discharge of Yangweishan sluice is 488-929 cubic meters per second.
There is a big drop in the main stream of Lianjiang River, and waterfalls often form in rainy days. After leaving Hanma Reservoir, it enters Chaoshan Plain, where the water flow is gentle. After flowing through quicksand, it flows eastward into White Pit Lake in Huitie Mountain, Baima River in Liu Ying Huida Nanshan and Huitangkeng River in Shigangshan, enters Chaoyang District and exits the South China Sea through Haimen Gate.
Lianjiang was 99 kilometers long. After liberation, it is 77.12km, with a slope of 0.89% and a catchment area of1346km2. The main stream in Puning City is 29.8 kilometers long, with a catchment area of 508. 13 square kilometers. First, the main stream is 94.5 kilometers long. In 1950s, the main stream bent straight at 16, and the length of the river was shortened by 23.4 km to 7 1 km. Watershed area 1346.6 square kilometers.
Overview of water conservancy
Before the founding of the People's Republic of China, the river regulation process was short, the drop was small, the river was curved and the flood discharge was not smooth. When the weather is dry, the salt tide rises, causing extensive salt damage. After the 1950s, comprehensive improvement was carried out, and reservoirs were built in the upper reaches and tributaries to store water. The main stream cuts directly at 16, and the length of the river is shortened by 23.4 kilometers; Flood control and drainage in front of the mountain effectively controlled the flood and drought disasters. Haimen built a bridge gate to eliminate salt damage.
In history, the water transport of Lianjiang is also more important. Before the founding of New China, there were wooden boats from Baikeng Lake to Chendian, and small steam turbines 44 kilometers below Chendian. In order to connect Lianjiang with Rongjiang and Hanjiang, a 7.5-kilometer-long Miancheng Canal (Houxi) was built in Miancheng in the Ming Dynasty, connecting Lianjiang with Niutianyang. In this way, ships can reach Jieyang and Haiyang safely and quickly without bypassing the open sea, which is of great benefit.