Who can talk about water conservancy project contracting?

Tushan weir is a great water conservancy project created by ancient Han working people. It belongs to the water diversion and irrigation hub project built on the Yinjiang River, a tributary of Yongjiang River. Located at Zhangxi exit next to Tashan Mountain, Yinjiang Town, Yinzhou, Ningbo City, Zhejiang Province. It was founded by the county magistrate Wang. Together with Zheng Guoqu, Lingqu and Dujiangyan in China, it is called the four major water conservancy projects in ancient China.

Tashan weir was built in the seventh year of Daiwa in Tang Dynasty (AD 833) and was presided over by Yong, a famous hydraulic scientist at that time. In ancient times, Zhangxi was often flooded because of its shallow riverbed and much flowing water in rainy season, but it was easy to dry up in rainy season, and seawater was poured backwards to erode the land, which was very harmful, so it was built to reduce water damage.

The total length of Tashan weir is134.4m, the weir surface is 4.8m wide and the weir height is10m. The upper part of the weir body is all long strips, with a length of 2-3m, a width of 1.4m and a thickness of 0.2-0.35m There are about 36 stone steps. In order to enhance the flood discharge capacity of the weir, three gangue gates, Wujin, Du Ji and Xingchun, were built on the Nantang River on the east side of the weir, respectively, as the auxiliary facilities of the other weir, so as to divert the river and form a water conservancy system with the other weir as the general hub, with complete discharge and reliable water storage.

Weir faces are all made of stone. 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. Known as "Meiliang of Tashan Weir". The slope of Tashan weir, the clay with gravel layer, the plane layout of the weir and the multi-stage nursing energy dissipation and scour prevention have created the miracle of ancient water conservancy projects. Among them, the first two are the earliest 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 resistance, light storage and drainage. Around the weir, there are still relics such as sand gate, water gauge, Wat Phnom and "Fragments" tablet. The wooden and stone structure of the stone step weir is said to have a big plum pillow lying in the weir, which will last for thousands of years and is called Shanyan Meiliang.