What is recorded in a book in the Southern Song Dynasty is that it transformed the sewage outlet in Ganzhou City. Not that it built Fushou Ditch. It is really recorded that Liu Yi built Fushou Ditch in the Ming Dynasty, but it is not clear who built Fushou Ditch when writing Ganzhou County Records in the Ming Dynasty. Therefore, according to others, it may have been built by Liu Yi.
In other words, there is no clear evidence that Fushou Ditch was built by Liu Yi in the Song Dynasty. Moreover, the statement that Ganzhou city has not been waterlogged for thousands of years is not accurate. Ganzhou, as a city on the river, is very troubled by waterlogging and foreign invasion. Waterlogging means that the rainwater in the city is difficult to drain, and foreign invasion means that the river outside the city enters the city.
Of course, Fushou Ditch was built to solve this problem. When Fushou Palace was built, its drainage was also deep. Some experts even pointed out that its design size is much deeper than the current urban drainage pipe, so its waterlogging is very rare. Of course, after Fushou Ditch was built, waterlogging actually happened. It can be said that there were many waterlogging incidents in Ganzhou city in Ming Dynasty.
This is also because there were too many residents in Ganzhou City at that time, and some residents built houses on the Fushou Ditch, which led to the impassability of this water pipe. So when it rains, the house is easily flooded. Until the Qing Dynasty, Ganzhou organized manpower to repair Fushou Ditch. This is just a flood. Besides, there are many foreign invasions. According to historical data, many dynasties in Fushou Ditch showed signs of flooding. Therefore, it is only a myth that Ganzhou city is not waterlogged for thousands of years.