Feishayan

Feishayan, which may seem ordinary, is the key to ensuring that the Chengdu Plain is not affected by floods. Its main function is that when the water volume in Neijiang River exceeds the upper limit of the Baopingkou flow rate, the excess water will overflow from Feishayan. In the event of an extraordinary flood, it will collapse on its own, allowing a large amount of river water to return to the main flow of the Minjiang River.

In addition to taking the escalator up to see the panoramic view of the entire dam, walking along the river is also very pleasant and comfortable.

It's just a water conservancy miracle of the ancients... just flying sand and flowing water

Feishayan plays the role of discharging flood water and sand, and is the key point of Dujiangyan.

This is a part of Dujiangyan. It is not very scenic on its own, but it is amazing as part of a water conservancy project.

Very majestic and grand. The ancient people were so smart.

Feishayan, spillway. In ancient times, it was called "Jianshui River", which means flood discharge and sand discharge. Located at the end of Jingang Dike, it has a 200-meter-wide opening from south to north at a certain elevation (2.15 meters from the riverbed to the river surface). When the water volume of Neijiang River is small, it blocks the water to enter Neijiang Irrigation Area; when the water volume of Neijiang River is large, it discharges the excess water to Waijiang River. Moreover, due to its clever location design, it has a strong sand and stone discharge capacity and can discharge the sand and stones that flow into Neijiang River, so it is called Feishayan.

Compared with the Fish Mouth, the Feishayan next to it looks quite ordinary. It looks ordinary, but it can filter the silt in the river like a big sieve, so that the silt will not settle downstream and cause the disaster of river flooding.

A large gap on the south side of the Jingang Dike is the Feishayan, which is a very low weir. Its function is to overflow the weir when the water volume of the inner river is too large and re-enter the outer river, thereby reducing the risk of flooding downstream due to excessive water levels in the inner river. Since we visited during a rare flood period in Sichuan and the water volume of the Minjiang River was huge, the Feishayan played a role at this time, diverting too much water from the inner river. The weir of the Feishayan was therefore covered by the river water and could not be seen. Another function of the Feishayan is to form a vortex in combination with the surrounding terrain. The silt in the inner river will be entrained by the vortex and then thrown to the Feishayan, thus reducing the silt content in the inner river water and facilitating downstream irrigation.

A very historical photo, taken in early 2009, not long after the 2008 earthquake

One of the important parts of Dujiangyan, a good place for taking photos

Automatic filtering, you have to admire the wisdom of the ancients!

In ancient times, it was called "Jianshui River", which means flood discharge and sand discharge. Located at the end of Jingang Dike, it has a 200-meter-wide opening from south to north at a certain elevation (2.15 meters from the riverbed to the river surface). When the water volume of the inner river is small, it blocks the water and enters the inner river irrigation area; when the water volume of the inner river is large, it discharges the excess water to the outer river. Moreover, due to its clever location design, it has a strong sand and stone discharge capacity and can discharge the sand and stones that flow into the inner river, so it is called Feishayan.

The Dujiangyan Scenic Area is very unique. If you want to know more details, you can listen to the tour guide while watching the scenery.

The flood discharge channel, named "Shilang Weir" and "Golden Dike" in the Tang Dynasty, and later named "Jianshui River", has the remarkable function of discharging flood water and sand, so it is also called "Feisha Weir".

2018.1.20 The whole family traveled to Dujiangyan, walking from Baopingkou to Feishayan to experience the wisdom of the ancients, which was indeed a pioneering work;

In addition to the beautiful scenery, we also pay tribute to the important role that the ancient people’s construction projects played in economic and cultural security!

Feishayan further plays the role of flood discharge and sand removal! So this is also one of the charms of tourism. It not only brings physical and mental pleasure from the natural landscape, but also enhances various humanities knowledge, and also feels the significance and role of the great engineering in history!

The Fish Mouth, the Feishayan and the Baopingkou are really useful. You will only understand their mysteries after listening to the storytelling explanation of the tour guide. In short, the Dujiangyan Irrigation Project consists of three major parts: the Fish Mouth Diversion Dike, the Feishayan Spillway and the Baopingkou Inlet. It scientifically solves the problems of automatic diversion of river water, automatic sand discharge and control of water inlet flow, eliminates floods and makes the western Sichuan plain a "land of abundance" where "water and drought are controlled by people".

The Feishayan spillway, also known as the "flood discharge channel", is the second largest main project in the Dujiangyan water conservancy project. It looks ordinary, but it has great functions. Through its ingenious design, it can not only dredge floods and divert flows, but also has a powerful sand and stone discharge function. It is the key to Dujiangyan to ensure that the Chengdu Plain is not affected by floods.

Feishayan is the key to Dujiangyan to ensure that the Chengdu Plain is not affected by floods. Its main function is that when the water volume of the inner river exceeds the upper limit of the Baopingkou flow, the excess water will overflow from the Feishayan; in the event of an extraordinary flood, it will also break the dike by itself, allowing a large amount of river water to return to the main flow of the Minjiang River. Another function is "flying sand". The Minjiang River rushes from the mountains, carrying a large amount of silt and stones. If they are allowed to flow down the inner river, they will silt up the Baopingkou and the irrigation area. Feishayan is really considerate and takes things into consideration. It throws the silt and pebbles brought from the upstream, and even boulders weighing thousands of pounds, into the outer river from here (mainly by cleverly using centrifugal force), ensuring the smooth flow of the inner river. It is indeed a masterpiece of nature.

We should continue to carry forward the wisdom of the ancients and promote the heritage of Chinese civilization!

The water of Dujiangyan originates from Songpan. It is emerald green and passes through Feishayan to filter out fine sand and gravel again.

The long dike below Yuzui, which divides the inner and outer rivers, is called Jingang Dike. There is a low-lying area at the lower part of the dike opposite to Hutou'an on the left bank of the Neijiang River. In spring, autumn and winter, this is a smooth path for people to travel between Lidui Park and the cable bridge. In flood seasons, waves splash here, and it is the flood discharge channel of the Neijiang River.

The scenery here is OK. After watching, you can take the scenic sightseeing bus next to it for 10 yuan/person. It seems to go directly to Yuzui, but it is actually only 1 km away from Yuzui. I think it is good to walk there, and you can also see the picturesque scenery along the way. The picture below was taken along the way. If I take the bus, I will not be able to see such scenery~ And there are many people queuing for the sightseeing bus. It feels like you can walk there. So everyone decides according to their own situation. For details of Dujiangyan, you can also refer to my travel notes "Panda Man New Year Sichuan Chengdu & Surrounding Six-Day Tour" http://www.mafengwo.cn/i/6825053.html

From Yuzui, walk along the Neijiang River towards Lidui Park for about 900 meters and you will arrive at the Feishayan. The main function of the Feishayan is that when the water volume of the Neijiang River exceeds the upper limit of the Baopingkou flow during the flood season, the excess water will automatically overflow from the Feishayan. Another function of the Feishayan is to "fly sand". The water flow from the Feishayan into the outer river generates vortices. Due to the centrifugal effect, mud, sand and even boulders will be thrown over the Feishayan, so it can also effectively reduce the sedimentation around the Baopingkou.

Feishayan is one of the very good attractions in Dujiangyan Scenic Area. Feishayan is a flood discharge channel, which has the significant function of discharging flood water and sand. It is the key to Dujiangyan to ensure that the Chengdu Plain is not affected by floods. I am deeply impressed by the wisdom of the ancients, it is really a great design!

Feishayan, Baopingkou and Yuzui constitute the water conservancy project of Dujiangyan, which is very important and plays a significant role in flood control and irrigation.

Feishayan, a spillway, was named "Shilangyan" and "Jindi" in the Tang Dynasty, and later "Jianshuihe". It has the remarkable function of discharging flood and sand, so it is also called "Feishayan". Feishayan spillway: "Spillway" has the remarkable function of discharging flood and sand, so it is also called "Feishayan". Feishayan is one of the three major parts of Dujiangyan. It looks very ordinary, but in fact its function is very important. It can be said to be the key to ensure that the Chengdu Plain is not affected by floods. In ancient times, Feishayan was a temporary project built with bamboo cages and pebbles; now it has been cast in concrete to ensure a permanent effect.

The long dike below Yuzui, which divides the inner and outer rivers, is called Jingang Dike. There is a low and flat area at the lower part of the dike opposite to the Hutou Bank on the left bank of the Neijiang River. In spring, autumn and winter, it is a smooth road for people to travel between Lidui Park and the cable bridge. In flood season, waves splash here, which is the flood discharge channel of Neijiang River. "Deep dredging and low weir construction" is a famous saying of water management in Dujiangyan. Dashing refers to the deep dredging of the Feishayan section and the Neijiang section. The standard of deep dredging is the "lying iron" pre-buried deep in the river bottom by the ancients. The annual dredging should be done until the lying iron is reached, which is just right to ensure the water supply for the irrigation area. Low weir construction means that the Feishayan has a certain height. If it is too high, more water will enter, and if it is too low, less water will enter, which is not suitable.

Feishayan Spillway: The "Spillway" has the remarkable function of discharging flood water and sand, so it is also called "Flying Sand Weir". Feishayan is one of the three major parts of Dujiangyan. It looks very ordinary, but in fact, its function is very important. It can be said to be the key to ensure that the Chengdu Plain is not affected by floods. In ancient times, Feishayan was a temporary project made of bamboo cages and pebbles; now it has been cast in concrete to ensure a permanent effect.

Feishayan is the key to Dujiangyan to ensure that the Chengdu Plain is not affected by floods. Its main function is that when the water volume of the inner river exceeds the upper limit of the Baopingkou flow, the excess water will overflow from the Feishayan; in the event of an extraordinary flood, it will also break the dike by itself, allowing a large amount of river water to return to the main flow of the Minjiang River. Another function is "flying sand". The Minjiang River rushes from the mountains, carrying a large amount of silt and stones. If they are allowed to flow down the inner river, they will silt up the Baopingkou and the irrigation area. Feishayan is really considerate and takes things into consideration. It throws the silt and pebbles brought from the upstream, and even boulders weighing thousands of pounds, into the outer river from here (mainly by cleverly using centrifugal force), ensuring the smooth flow of the inner river. It is indeed a masterpiece of nature.

The majestic Feishayan is now quietly presented before my eyes...

Feishayan is one of the three main parts of the entire Dujiangyan. First, go to Fulong to see Baopingkou and the entire panoramic view of Feishayan. After Fulongguan, you can walk to Feishayan. The main function of Feishayan is that when the flow of Baopingkou reaches the upper limit, the excess water will flow out of Feishayan; and the other function is to throw the mud and stones in the river into the outer river through centrifugal separation, so as to ensure the smooth flow of the inner river. In Dujiangyan, we did not hire a tour guide, but because there were so many tour groups, we could hear different tour guides talking about different things by standing in the same place for a while, but they were basically the same. I really can't understand it by myself.

There are famous scenic spots in the Chinese textbook that are worth visiting.

The principle of Feishayan is as follows:

1. When the water volume of Neijiang River exceeds the upper limit of Baopingkou flow, the excess water will overflow from Feishayan by itself; in case of a severe flood, the dam will burst by itself, allowing the river water to return to the main flow of Minjiang River.

2. "Flying sand" uses the principle of gravity to throw the silt and pebbles brought from upstream into the outer river from here to ensure the smooth flow of the inner river

The scenery is also beautiful, all in the scenic area, and it is worth a visit.

Feishayan is the essence of the Dujiangyan project. It is a waterway with a higher riverbed, used to prevent excessive floods and pebbles from entering the inner river. In the past, there was a road that crossed the middle and connected Lidui and Yuzui. It was the throat of the scenic area. There were stone cages on both sides to adjust the discharge level and prevent the river from flooding the road too frequently. However, it was still quite risky to pass through this road. In summer, the river water often rose rapidly and flooded the road. Later, a sluice gate and bridge were built on one side of the road (in the photo), so tourists no longer had to worry about wading through the water, but it also lost some of the fun of adventure.

After listening to the tour guide's explanation, I can better appreciate the wisdom of the ancients.

Feishayan is a flood discharge channel and the second largest main project in the Dujiangyan Water Conservancy Project.

Great engineering, benefiting generations to come, ingenious hydraulics

The Feishayan spillway is also known as the "flood discharge channel". It has the remarkable functions of flood discharge, sand discharge and water volume regulation, so it is also called the "Feishayan". Feishayan is one of the three major parts of the Dujiangyan. It looks very ordinary, but in fact, its function is very important. It can be said to be the key to ensure that the Chengdu Plain is not affected by floods. The main function of the Feishayan is that when the water volume of the Neijiang River exceeds the upper limit of the Baopingkou flow, the excess water will overflow from the Feishayan; in the event of an extraordinary flood, it will also break the embankment by itself, allowing a large amount of river water to return to the main flow of the Minjiang River. Another function of the Feishayan is "flying sand". The Minjiang River rushes from the mountains, carrying a large amount of mud, sand and stones. If they are allowed to flow down the Neijiang River, they will silt up the Baopingkou and the irrigation area. In ancient times, the Feishayan was a temporary project built with bamboo cages and pebbles; now it has been replaced with concrete casting to ensure a permanent effect.

This is amazing!!! 40% water, 60% sand, people at that time were really smart! So clever and wise, and it has been used for more than 2,000 years, and it still benefits future generations.

It is the second largest main project of the Dujiangyan Irrigation Project. It has the remarkable function of discharging flood water and sand, so it is also called "Flying Sand Weir".

The Dujiangyan ticket includes all the attractions, and the walking tour takes 2-3 hours. The water is very clear, the environment is good, and you can hear the sound of water when the water volume is large.

Feishayan is a long dike below Yuzui. Although it looks ordinary, it plays a huge role in discharging flood water and sand. It is the key to the Dujiangyan Irrigation Project to ensure that the Chengdu Plain is not affected by floods.

The so-called 28% sand ratio is here. You have to admire the wisdom of the ancients. The original ancient method of intercepting the flow saves time and money than today's method.

In the Dujiangyan scenic area, a famous scenic spot, the price is not bad, it is really good

After passing Lidui Park, walk a little further and you will reach Feishayan. Feishayan is the second largest main project of the entire Dujiangyan. It has a powerful sand and stone discharge function and is the key to Dujiangyan to ensure that the Chengdu Plain is not flooded. In addition, from Feishayan, you can see the panoramic view of the entire Lidui Shang Fulong Temple. If you want to overlook the entire Feishayan, you have to go to the mountain of Erwang Temple to overlook it~

Keep the water flowing into the Chengdu Plain at a stable level all year round.

It's very beautiful and worth a visit. Although I didn't have a tour guide or a group, it's good to just take a look.

When I went to Dujiangyan, I didn't find a tour guide and no one explained it to me, so I couldn't understand the principle of Dujiangyan. But there is an ancient town outside, which is very nice.

In ancient times, Feishayan was a temporary project made of bamboo cages and pebbles; now it has been replaced with concrete casting to ensure a permanent effect. If you travel independently, it is best to do your homework in advance, otherwise you will not be able to experience the essence of water conservancy projects. Feishayan is a flood discharge channel, which has the significant function of discharging flood water and sand, and is the key to Dujiangyan to ensure that the Chengdu Plain is not affected by floods.

The only feeling in the whole country is to admire the great contributions of Li Bing and his son.

Dujiangyan, the first destination of tourism, is good

Feishayan is the second main project of Dujiangyan Irrigation Project. This weir is built on the side of Lidui and is a low dam. Its main function is to discharge floodwater and sand for Neijiang. After listening to the tour guide's explanation and knowing the function of Feishayan, I was really amazed at the wisdom of the ancients.

The long dike below Yuzui, which divides the inner and outer rivers, is called Jingang Dike. There is a low-lying area at the lower part of the dike opposite to Hutou'an on the left bank of the Neijiang River. In spring, autumn and winter, this is a smooth path for people to travel between Lidui Park and the cable bridge. In flood seasons, waves splash here, and it is the flood discharge channel of the Neijiang River.

Feishayan is the key to Dujiangyan to ensure that the Chengdu Plain is not affected by floods. Its main function is that when the water volume of the inner river exceeds the upper limit of the Baopingkou flow, the excess water will overflow from the Feishayan; in the event of an extraordinary flood, it will also break the dike by itself, allowing a large amount of river water to return to the main flow of the Minjiang River. Another function is "flying sand". The Minjiang River rushes from the mountains, carrying a large amount of silt and stones. If they are allowed to flow down the inner river, they will silt up the Baopingkou and the irrigation area. Feishayan is really considerate and takes things into consideration. It throws the silt and pebbles brought from the upstream, and even boulders weighing thousands of pounds, into the outer river from here (mainly by cleverly using centrifugal force), ensuring the smooth flow of the inner river. It is indeed a masterpiece of nature.

Feishayan is the key to Dujiangyan to ensure that the Chengdu Plain is not affected by floods. Its main function is that when the water volume of the inner river exceeds the upper limit of the Baopingkou flow, the excess water will overflow from the Feishayan; in the event of an extraordinary flood, it will also break the dike by itself, allowing a large amount of river water to return to the main flow of the Minjiang River. Another function is "flying sand". The Minjiang River rushes from the mountains, carrying a large amount of silt and stones. If they are allowed to flow down the inner river, they will silt up the Baopingkou and the irrigation area. Feishayan is really considerate and takes things into consideration. It throws the silt and pebbles brought from the upstream, and even boulders weighing thousands of pounds, into the outer river from here (mainly by cleverly using centrifugal force), ensuring the smooth flow of the inner river. It is indeed a masterpiece of nature.

"Dig deep and build weir low" is a famous saying of water management in Dujiangyan. Digging means that the Feishayan section and the Neijiang section of the river channel must be dredged deeply. The standard of deep dredging is the "lying iron" pre-buried deep in the river bottom by the ancients. The annual dredging should be done until the iron is lying, which is just right to ensure water supply for the irrigation area. Building weir low means that the Feishayan has a certain height. If it is too high, more water will enter; if it is too low, less water will enter, which is not suitable.

As an integral part of the Dujiangyan project, this is a must-see.

The Feishayan, located not far upstream of Baopingkou, is one of the three main projects of the Dujiangyan canal. Its main function is to allow the excess water to overflow from the Feishayan when the water volume of the inner river exceeds the upper limit of the Baopingkou flow. In the event of a major flood, it will also break its own embankment, allowing a large amount of river water to return to the Minjiang River. Another function is to "fly sand", throwing the mud, sand and rocks carried by the Minjiang River rapids from here into the outer river (mainly by cleverly using centrifugal force) to ensure the smooth flow of the inner river.

I went to the Dujiangyan Water Conservancy Project Scenic Area on New Year's Day last year. I used my student ID to get half-price tickets for more than 40 yuan, which I instantly felt was a good deal. Feishayan is part of the water conservancy project. I felt a little cold when I was standing on the side taking pictures. It was cloudy when I went there. If it was summer and the weather was good, the water flow would be faster and more spectacular. Feishayan is also one of the most suitable places for taking pictures in the Dujiangyan Water Conservancy Project. Next to it is the place where you can buy tickets for the sightseeing bus. It takes a while to walk from the gate to Feishayan. If you continue to walk forward, the scenic spot is a little far away, so it is very suitable to start taking the sightseeing bus here, and it only costs 15 yuan for a round trip.

Feishayan is also part of the Dujiangyan Project. The Dujiangyan Project is divided into three parts: Yuzui, Feishayan, and Baopingkou! Feishayan plays a huge role. When the water volume of the inner river exceeds the upper limit of Baopingkou, the excess water will overflow from Feishayan. In case of a major flood, the embankment will collapse automatically, allowing the river water to return to the main flow of the Minjiang River. Another function is "flying sand", using the principle of gravity to throw the silt and pebbles brought from the upstream into the outer river from here to ensure the smooth flow of the inner river. This is the huge role of Feishayan, so I have to be deeply impressed by the wisdom of the ancients! You must go and see it!

Feishayan. It is used to divert floodwaters and is also the location of the four sleepers in Figure 2. From a distance, the water flows in two directions, one to the left and the other to the right. Usually the water flows to the right and enters Baopingkou. When the water is too strong and passes over Feishayan, the overflowing water will flow to the left and enter the river on the left. It is not the real flood season yet, so there are still grasses on the left.

This mountain was specially created under the guidance of Li Bing, it was not formed naturally, and it reflects the wisdom of the ancients.

Feishayan: located upstream of Baopingkou, between Jingang Dike and Renzi Dike. It is built by stacking pebbles in bamboo cages to regulate water volume and wash sand. When the water level of Neijiang River is too high, the flood will overflow Feishayan and flow into Waijiang River, ensuring that the amount of water passing through Baopingkou is not too large; at the same time, after the water flows into Neijiang River, the local river flow still belongs to the slightly curved river section. Under the effect of the bend circulation, the bottom water flow points to Feishayan, and the bottom flow crosses the top of the weir. Pebbles and high concentrations of suspended sand near the bottom can be effectively discharged to Waijiang River, which can effectively reduce the deposition of silt around Baopingkou. In order to observe and control the water volume of Neijiang River, Li Bing also carved three stone piles and placed them in the water to determine the water level by "not flooding the feet in low water and not exceeding the shoulders in flood water". He also chiseled a stone horse and placed it in the middle of the river as a standard for washing the beach when the water volume is the lowest each year.

One of the three major projects of Dujiangyan, it is also the last barrier. There is no artificial gate to open, and it completely uses natural principles to ensure flood discharge and sand removal. I can't help but sigh at the wisdom of the ancients. It's just that the embankment was originally built with bamboo cages and pebbles, which needed to be repaired every year. Now it has been changed to concrete pouring, which is once and for all.

I really admire the designer, it is beyond the imagination of modern people.

An introduction to Feishayan. But what’s strange is that there are Korean and Japanese words on it, but no English, which is the most common word.

After taking the photos, ZZ and I ran to the riverside to take more photos of the scenery while waiting for the main group. The water here is still very fast, with white waves roaring all the way. I like this kind of green on the other side of the river. When we were taking a boat tour on Poyang Lake, the green on the Shizhong Mountain on the shore was also like this, as if it was nourished by the rushing water below the mountain to be so moist.

Standing by the river and looking into the distance, you can see the vast water and the faint green mountains. Before the construction of the Dujiangyan Irrigation Project, when the Minjiang River flooded, the Chengdu Plain below became a vast ocean, and in the dry season, it was a barren land with no harvest. The emergence of the Dujiangyan Irrigation System not only played a role in flood prevention, but also dredged the turbulent Minjiang River and irrigated the Chengdu Plain, making it a land of abundance with fertile fields. Can it be said that without the Dujiangyan Irrigation System, China's history might have been rewritten?

You can go and see it when the weather is good, it's very beautiful ~ recommended

A scenic spot of the Dujiangyan Irrigation Project, magnificent and beautiful.

As part of the Dujiangyan hydraulic project, the scenery is average, but from the perspective of appreciating water conservancy projects, it embodies the wisdom of the ancients and is worthy of appreciation.

Located in the Dujiangyan Scenic Area, the ticket price is 90 yuan. The environment here is very good and there is a viewing platform specifically for taking photos.

The viewing platform of Feishayan has now been occupied by these people. When we came here before, there was no fence at all and we could take pictures at will on the viewing platform. But now it is completely impossible. If we want to take pictures, we have to ask them to help us, and it costs money.

The flood discharge channel was named "Shilang Weir" and "Golden Dike" in the Tang Dynasty, and later named "Jianshui River". It has the remarkable function of discharging flood water and sand, so it is also called "Feisha Weir".

The Feishayan Weir was built to ensure that there are no disasters in the inner river. A bend was built in front of the spillway to allow the river water to form a circulation. When the river water exceeds the top of the weir, the mud and rocks carried in the flood will flow into the outer river, thus preventing the inner river and the Baopingkou waterway from silting up.

The second flood discharge channel of Dujiangyan is basically a grass dam in the low-water season. The spectacular Feishayan can only be felt in the flood season in summer. Feishayan can not only divert floodwaters to protect the Chengdu Plain from water damage, but also use centrifugal force to separate sediment from the Neijiang River. With Feishayan, the Neijiang River is not blocked, so that Dujiangyan is still in use today. From Lidui Park to Yuzui, you have to cross Feishayan. You can take a sightseeing bus to Yuzui at Feishayan, which costs 10 yuan for a one-way trip and 15 yuan for a round trip. Feishayan is also the best place to watch Lidui, where you can see the spectacular scene of the river water pouring into Baopingkou.