At that time, Xinghua Plain on both sides of Mulanxi River was frequently attacked by floods washed down from the upstream and tidal waves flooded from the downstream. According to legend, Qian Siniang, a woman from Changle, witnessed the sufferings of the local people, and in the first year of Zhiping in the Northern Song Dynasty (1064), she began to intercept the river and build a weir. Due to the rapid flow of water, the completed weir was quickly washed away by mountain torrents. Qian Siniang was so angry that she jumped into Xihong to die. Since then, Jin Shilin, who is in the same town as Qian Siniang, has brought 65.438+10,000 yuan of gold from all over the world to continue to build dams, but it failed because of the rapid current. In the eighth year of Xining in the Northern Song Dynasty (1075), Li Hong, an official of the later dynasty, donated money to build a vicious circle. He summed up the lessons of the previous two failures, and with the help of Feng Zhiri, a monk, re-surveyed the terrain and water potential, and changed the site of vicious circle into the site of Mulan vicious circle, with wide waterways, slow flowing water and large bedrock. After eight years of painstaking construction, it reached the sixth year of Yuanfeng in the Northern Song Dynasty (65438).
The project is divided into two parts: hub and supporting facilities. The hub project is a dam, which consists of overflow weir, intake sluice, sand sluice and diversion dike. The overflow weir is a box weir with a length of 2 19 m and a height of 7.5 m. There are 32 weir gates and 29 weir piers, which are closed during drought and open during flood. The weir dam consists of tens of thousands of granite hooks weighing 1000 kilograms. These stones are interconnected and extremely strong. They have withstood the violent impact of countless mountain torrents for more than 900 years and are still intact. There are hundreds of large and small ditches with a total length of more than 400 kilometers, of which the south main canal is about 1 10 kilometers, and the north main canal is about 200 kilometers long. More than 300 gates and culverts are built along the line. The whole project has the functions of flood control, water storage, irrigation, shipping and fish farming. 1958, an overhead inverted siphon project was built near Beipi, which led the water from Dongzhen Reservoir to the coastal area, greatly improving the irrigation and flood discharge capacity of Mulan Beipi, and the irrigation area increased from the original 15000 mu to 250,000 mu.
In order to commemorate the historical celebrities in Jianbei, Xie Ying Temple, also known as Li Hong Temple, was originally built in southern Hebei, and now it is changed to Mulan Memorial Hall. There are statues of four rich women, such as Lin Congshi, Li Hong and Feng Zhiri, as well as inscriptions on Embroidered Skin written by famous historical figures since Ming and Qing Dynasties, and six poems on Mulan Skin written by Guo Moruo during his visit here in the winter of 1962, with a total of 12 pieces. Next to the museum are Engong Pavilion and Song Zhenggeng's Mulan Bookstore. Outside the museum, the lakes and mountains are beautiful and the scenery is pleasant, especially when the spring water begins and the stream overflows into the sea, white waves surge, which is known as "Mulan comes in spring".