Three Gorges dam opens three holes for flood discharge. Does this have any effect on the flood?

Simply put, flood discharge is to put the excess water in the upstream into the downstream. This function is to protect the dam first, and then to protect the upstream and downstream from floods.

Three Gorges Dam

On July 2nd, the Yangtze River Water Resources Commission issued a blue warning for flood, and the "Yangtze River FloodNo. 1 in 2020" was formed in the upper reaches of the Yangtze River. The Three Gorges Dam opens the three-hole floodgate, and the flow through the three holes is 4350 cubic meters per second. ''?

In fact, there will be flood season in the whole country every year, and there will be floods in many places this year. In order to reduce the occurrence of floods, dams play an important role. The principle of flood discharge is that after the flood occurs in the upper reaches of the flood season, the dam will discharge the flood to the flood storage and detention area. When the water level in the flood storage and detention area reaches the warning line, it is necessary to open the floodgates and discharge the water to the downstream flood discharge area.

Three Gorges flood discharge

Secondly, the flood discharge of the Three Gorges Dam has the following functions: First, if the water level exceeds the warning line and the dam pressure increases, it is likely to break the dam, so flood discharge can protect the Three Gorges Dam. Second, it is also a kind of protection for the upstream and downstream residents. First, flood discharge by opening floodgates will reduce the upstream water level, which will undoubtedly protect the upstream safety; Secondly, it is also a protection for the downstream. It seems that opening three holes is harmful to the downstream, but actually opening three holes will not have a substantial impact on the downstream. However, in the face of extremely strong rainfall, more holes have to be opened for flood discharge. For example, under the pressure of flood, Wangjiaba of Huaihe River is eager to open nine holes for flood discharge, while nearly 20 million residents in the lower reaches have to leave their homes. After opening nine holes, their home will instantly become Wang Yang, but more people will be protected.

Three Gorges flood

This year, all parts of the country have suffered from different degrees of rainfall, and many places in the south are also suffering from floods. Under this natural disaster, not only the dam is playing an important role, but many people are also using their own strength to save more people. In the disaster, we saw this moral quality of unity.