Won't the South-to-North Water Transfer Project be exposed to waste water due to evaporation? Why not use underground pipes?

China covers an area of ​​more than 9 million square kilometers, and its vast territory also produces a great difference between the north and the south. As the saying goes, "drought and drought are flooded." A great century project "South-to-North Water Diversion", but this project chose open-air pipelines with huge evaporation instead of underground pipelines. Why choose this method that wastes resources? You may not guess the answer.

First of all, we need to understand why this project was started. The south is too abundant in water resources but has nowhere to use it, while the north focuses on agriculture, but suffers from serious water shortages. This affects their development of agriculture and also affects our food security. In order to make the best use of everything and solve this problem, the South-to-North Water Transfer Project was launched.

The second is where everyone feels strange, why not use underground pipes? Isn't the massive evaporation of water in open channels an invisible waste? In fact, it is because if the underground pipeline is used, the quality of the pipeline must be very high, because the entire project is thousands of kilometers long instead of a short distance, and the environment passing through is complex and constantly changing.

There is also the issue of climate. Needless to say, whether it is cold or not in the north is cold. If underground pipes are used, once the water is frozen, the water source cannot be transported. The low temperature environment will also affect the quality of the pipes, resulting in damage to the pipes.

Everyone will definitely say that if the pipeline is damaged, it is necessary to find someone to repair it. It is very inconvenient to repair the deep underground pipeline, and the cost is very expensive. In addition, the project is carried out by a number of pipeline companies, but there are very few talents to repair such large pipelines, not just casually. A repairman can do it.