Horizontal iron

Horizontal iron

Lying iron is the standard of taotan buried in the "fengqiwo" of Neijiang River, and it is also the mark of annual maintenance of the depth of Qingtao river bed in Neijiang River.

effect

Horizontal iron is mainly used to mark the depth of excavation. Because Dujiangyan follows Li Bing's principle of "scouring the beach deeply and making the weir low", it has been necessary to remove the silted sediment from the river channel every dry season since ancient times. How deep is it suitable to dig the sand? After people's experience, we found out a suitable depth and buried the horizontal iron. In the future, the annual repair will be done until the iron is laid.

Evolution history

It is said that when Li Bing built the weir, there was a stone horse buried under the riverbed of Neijiang River, which was used as the standard of beach scouring depth every year, and later evolved into horizontal iron.

The six character water rule of "deep beach, low weir" and the eight character maxim of "meet the Bay corner, meet the right heart" are the yardsticks of taotan in Dujiangyan. If the depth of taotan is not enough and the riverbed of Neijiang River is too high, it will reduce the water diversion of spring irrigation in Chengdu Plain in the coming year. If the depth of taotan is too deep, it will cause excessive flood into Neijiang River and lead to flood disaster in Neijiang irrigation area.

So far, there are four pieces of wotie. It was first cast in the third year of Wanli in the Ming Dynasty (1575), and was presided over by Guo Zhuang, the governor of Sichuan.

About 200 meters down the Neijiang River from Yuzui is the famous fengqiwo. The place where fengqiwo lies next to the river bank is the burial place of the magic sleeping iron. Four sleeping irons lie side by side along the direction of the river. Facing the middle of the river is the latest one, which is engraved with the words "established by the Ministry of water resources of the people's Republic of China and Sichuan Provincial People's Government..." word. It is understood that the innermost one of the four pieces was buried in the third year of Wanli in the Ming Dynasty and cast by Guozhuang. The second one was cast by he Xianyi in the third year of Tongzhi in the Qing Dynasty. The third one was cast by Guan Xingwen in the Republic of China in 1927. The fourth one was cast in the 2250th anniversary of the construction of Dujiangyan weir in 1994 and was placed in 1998.

Although the earliest verifiable wotie in historical records was cast in the Ming Dynasty, as a measure of the water quantity of the Minjiang River, the "wotie" in addition to the physical form was used in other forms, such as stone piles and portraits, along with the 2260 year history of the construction of Dujiangyan weir.

After taotan, which is built according to the standard of wotie, there is a 3000 meter long Yuzui dike. In the drought and flood season, when dividing the water quantity of Minjiang River between Neijiang River and Waijiang River, we can easily calculate the philosophy of "four and six": in the spring farming season, the water inflow of Neijiang River is 60%, and that of Waijiang river is 40%. In the summer and autumn flood season, the proportion of inflow from the inner river and the outer river is automatically reversed, with 40% of the inflow from the inner river and 60% of the inflow from the outer river. This is what the three character Scripture of Dujiangyan water control says: "divide into four and six, and smooth the drought.".

The amount of water that Dujiangyan brings to Chengdu Plain every year is a huge problem. However, the scientific measure of water diversion is still horizontal iron. The standard for the annual construction of taotan in Dujiangyan is to see the sleeping iron. In a more elaborate way, wotie has become the "measurement" of water in the land of abundance.

At present, there are four sleeping irons buried in the fourth year of Wanli in Ming Dynasty, the third year of Tongzhi in Qing Dynasty, the 16th year of the Republic of China and 1994. Tourists can see the replica of the four pieces of lying iron in the fountain of Lidui ancient garden. The real one is still buried under the river bed of Neijiang River.

Address: Lidui Park, Dujiangyan, Chengdu

Longitude: 103.61430164724

Latitude: 30.996272228436

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Chinese PinYin : Wo Tie