Tashan weir is located beside Tashan Mountain in Yinjiang Town, Yinzhou District. Together with Zheng Guoqu, Lingqu and Dujiangyan in China, it is called the four major water conservancy projects in ancient China, and it is a national key cultural relic protection unit. Tashan weir was built in the seventh year of the Tang Dynasty (AD 833), with a total length of134.4m, a height of about 3.05m and a width of about 4.8m ... The weir surface is all made of strip stones. The weir is made of wood and stone, and there is more than one big plum pillow lying in the weir, which will not rot for thousands of years, so it is called Tashan weir Meiliang. The slope of Tashan Weir, the clay with gravel layer, the plane layout of the Weir and the energy dissipation and scour prevention mode of multi-level face protection have created the miracle of ancient water conservancy projects in China. Among them, the first two are the first ancient water conservancy projects in China, which are more than 200 years earlier than the application of similar technologies abroad. Tashan weir project, after more than 1 160 years of wind, frost, rain, snow and flood, is still basically intact and continues to play the role of salt tolerance, light storage and drainage. Around the weir, there are still ruins such as sand sluice, water gauge, Tashan Temple and flaky incense tablet.
According to legend, there is a big plum pillow lying in the stone step weir, which is immortal for thousands of years and is called Shanyan Meiliang.
Weir system is a canal head project to prevent seawater salinization and divert light. After cutting off the Yinjiang River, the water from Zhangxi in the upper reaches will flow all the way into Nantang River, pass through Dongqiao, Zhangheng, Beidu, Lishe, Shishang and Duantang, pass through Yongshuimen Gate in Cheng Nan, and flow into Riyue Lake (Riyue Lake has been submerged), and then meet the urban demand through branch canals. Journey to the south entered Xiaoxigang and went to Meiyuan and Jiao Jiao. The water from the two roads was diverted through the original port of Yin Xiping, which irrigated thousands of hectares of farmland in seven towns (now benefiting 240,000 mu of farmland). The weir is well designed, unique in structure and precise in construction. During waterlogging, water flows into rivers at seven points and streams at three points; During drought, seven points enter the stream and three points enter the river. Between the inner and outer rivers and the lower reaches of the Nantang River, there are three gates, Wujin, Du Ji and Hangchun, which are used for opening and closing storage and discharge. In the first year of Song Xining (1068), the county magistrate ordered Daning to build a windbreak near Beidu, and in the second year (1242), the county magistrate ordered Chen to build a sand sluice at the northwest of the weir 150 meters to prevent siltation in the inner port.
Due to the changes of the ancient river channel, it has become a relic. There are four exposed trough columns on the ancient river channel. The second column in the west is engraved with a water gauge and a water level scale as a discharge standard. The third column is engraved with the word _ shaman. There are sluice slots on both sides of the stone pillar to press the sluice. About 1255 (Song Bao _), the Central Secretariat ordered Janice to build three dams in the east of Yinjiang Town (far from the dammed lake), one near the river and the other near the river. There is a dam by the river. 1924 is rebuilt here. Shihongshuiwan pond is 302 meters long and 4. 16 meters high. The pond is arched, and there is a concave stream extending into the river, which is separated from Guangxi and Yinjiang sluice. This is the second lane for the flood discharge of Tashan weir. 1987, Hongshuiwan sluice was newly built, and the original Yantang site still exists. There are also Guantang and Dog Neck Pond. By the end of the Qing Dynasty and the beginning of the Republic of China, the number of supporting projects had increased to nine dams, five weirs and thirteen ponds. After the establishment of People's Republic of China (PRC), the old dams, weirs and ponds were rectified to make them more perfect.
Tashan weir, Zheng Guoqu, Lingqu and Dujiangyan are also called the four major water conservancy projects in ancient China. Up to now, after thousands of years of flood impact, it is still basically intact and still plays the role of salt tolerance, light storage, water diversion and flood discharge. Many people at home and abroad are studying this weir. 1June, 982, Yinxian People's Government announced it as a key cultural relics protection unit in the county. 198865438+February 28th, it was declared as a national key cultural relics protection unit by the State Council.