In order to protect water quality, the South-to-North Water Diversion Canal implements a year-round fishing ban policy, because the South-to-North Water Diversion Project is one of the largest major projects in China, which is related to people's livelihood, so water quality protection is particularly important.
So many years have passed, and the trunk canal has long formed a unique ecosystem, and no one has fished for a long time, so how big is the largest fish in the trunk canal of the South-to-North Water Diversion Project?
At the beginning of a passage in ***, he once proposed, "There is a big difference in water resources between the north and the south, and it would be nice if we could realize cross-regional water transfer." Since then, China has been studying and planning for decades.
Eventually, they worked out three water transmission routes, the eastern, central and western routes, of which the eastern and central routes had been completed and successfully transported water, but the western route was still being studied. Since the beginning of 2021, 40 billion cubic meters of water have been transported by the South-to-North Water Diversion Project.
On November 15, 2013, the Eastern Route Project was officially opened, which will divert water from the Yangtze River to Tianjin and Shandong. For those areas on higher ground, pumps are also used to pump and drain water.
On December 12, 2014, the middle line project was successfully opened to water, diverting water from the Danjiangkou Reservoir to Beijing, Tianjin and other places. In addition, the project not only spans the Taihang Mountain Plain, but also crosses many major rivers in China.
At present, the western route project is still in the feasibility test stage, which has brought great challenges to the implementation of the project due to its huge engineering difficulty and frequent natural disasters in the areas it passes through. Not only does this pose a serious threat to water quality, but safety is difficult to guarantee even after the completion of the project.
Even after the project is completed, maintenance is a onerous task and brings little benefit. Therefore, we need to find a more convenient and safe way to build.
Since 2014, the eastern and central routes of the South-to-North Water Diversion Project have been completed one after another, and water has been transported for nine consecutive years, transporting tens of billions of cubic meters of water to North China, which is a costly project.
Moving thousands of West Lakes to the north will not only solve the problem of water resources for hundreds of millions of people, but also alleviate the plight of ecological and environmental degradation.
The current situation shows that the water supply is working well and the water supply is in line with expectations, so the investment is worthwhile. Although not all of the water transported from the north is sufficient, it is sufficient.
What is the rationale for choosing a fishing ban?
Once the central line is officially opened, a total fishing ban will be imposed, and the Danjiangkou reservoir will also be affected.
In order to guarantee the quality of the water, it is necessary that all fishing activities that may pollute the waters are strictly prohibited.
In order to ensure that the Danjiangkou Reservoir can store water more sufficiently, the construction work has been completed, which has directly increased the capacity of the reservoir and reached the national secondary water source standard. As the main water source of the middle line, the Danjiangkou Reservoir has been built to ensure that there are more water sources**, and after the completion of the project, the reservoir capacity has been directly increased to a level to meet the national secondary water source standard.
In order to ensure the safety of water sources, strict measures should be taken to strictly prohibit all activities that may lead to water pollution, because the water transmission channels of the middle route project are mainly affected by human factors.
In order to solve the problem of water quality, the state has established corresponding water protection areas on both sides of the Danjiangkou reservoir and the main stream. The primary task is to solve the problem of water quality, so the state has set up corresponding water protection areas on both sides of the Danjiangkou reservoir and the main stream.
In order to prevent man-made contamination of the water source, a green barrier has also been set up in the surrounding waters, and it can be said that comprehensive protection is carried out in all directions to ensure that the water quality meets the standards.
In order to avoid the water quality from coming into contact with natural water sources such as rivers and lakes, the slope and bottom of the water pipeline will be poured concrete during the construction process to ensure water quality.
Divide the middle trunk canal into 30 sections, and assign dedicated staff to each section so that managers can monitor and manage it in real time.
Because there is a special person in charge, the fish in the water can grow freely, and the water is not polluted, these fish grow very fat, so it attracts a large number of fishing enthusiasts.
As we all know, the South-to-North Water Diversion Project is a huge project, which requires not only huge capital investment, but also a lot of manpower and material resources. If the water is polluted, all the efforts will be in vain.
In order to protect the well-being of the local population and to prevent the river water from being polluted, the state has taken these measures. Therefore, there is a justification for banning fishing.
What is the size of the king of fish?
In order to ensure the normal operation of water sources, the implementation of the South-to-North Water Diversion Project will dismantle substandard reservoir dams, dismantle factories that block the flow of water sources, and rebuild thousands of acres of crab farms.
In 2015, a year after the opening of the middle route of the South-to-North Water Diversion Project, fish were surveyed in the main route, and juvenile fish were found in the water at that time.
In 2019, in Danjiangkou, Hubei Province, a road weighed 5225 kg, body length about 17-meter giant catfish** caught.
This catfish has grown to the extreme, and if it is hung on the water, it is as tall as a person, and it can also be called the "king of fish".
It is well known that if no one catches it, the weight of the grass carp can reach alarming levels.
A large fish was found swimming happily in the canal, and it can be inferred from its length and size that it was about a meter long and weighed more than 50 kilograms.
The user zoomed in and could clearly see that it was a grass carp, and this was only a small part of it, and there must be countless such huge fish in this thousand-kilometer-long waterway.
The staff of the relevant departments also confirmed this alarming phenomenon and showed that in the headwaters of the river, such huge fish are common, and they have even caught a large fish weighing up to 70 kilograms.
After so many years of work, it is impossible for experts not to take into account the impact of too much quantity on water quality.
Tiny strainers are set up on each water port, which is used to block the big fish from moving forward and ensure that the small fish pass through.
The relevant departments will often send personnel to check the water quality and fish stocks in each section of the river, and if there is a large number of fish, the relevant departments will fish to maintain the ecological balance without our warning.
At present, the fish population in the canal is thriving, and the year-round ban on fishing ensures clean water quality under the protection of the law.
While some fear that prolonged closures will lead to excessive fish growth, the reality is that the risk of ecological imbalances has been minimized through engineering design and effective monitoring.
In the future, this artificial ecological oasis will continue to flourish, bringing true well-being and a safe home for people and nature.
South-to-North Water Diversion