Why not open a hole to let Xin 'anjiang Reservoir flood for a few more days?

The opening of reservoir spillway is determined according to the water volume and downstream bearing capacity of the reservoir. The three spillway outlets of Xin 'anjiang River are the result of the reservoir storing water for several days in order to stagger the flood peak of Lanjiang River.

The water level in the reservoir has far exceeded the warning line. If the water cannot be discharged to the normal water level in a short time, it will cause danger to the cofferdams, slopes and dams around the reservoir. Therefore, it is necessary to open more holes for flood discharge.

However, the lower reaches of Xin 'anjiang River can't bear the heavy flood, so according to the calculation, only three holes were opened. If the water level in Xin 'anjiang rises, or it rains again, five holes may be dug.

However, if only one hole is opened, the reservoir will run at a dangerous water level for a long time because of its small flow, which is even more harmful.

Extended data:

Xin 'anjiang Reservoir has exceeded the upper limit of flood level, and the water level is still rising. The necessary emission level has been reached.

At 22: 00 on July 2, 2020, the water level of Xin 'anjiang Reservoir began to rise from 104.48 meters. On July 6th 12, the water level of the reservoir reached 106.55438+0m, which exceeded the flood level by 0.0 1m and continued to rise. According to the weather forecast at that time, it was predicted that the water level would exceed107m on July 7th, which was the direct reason for the decision to open three tunnels for flood discharge on July 6th.

At 2 o'clock on July 7, it suddenly rained heavily in Xin 'anjiang reservoir area. By 9: 00 on July 8, the highest water level reached 108.39 meters. The weather forecast shows that there will be more heavy rainfall in the future. In order to ensure dam safety, downstream personnel safety and river basin safety, the rapid rise of water level and subsequent heavy rainfall forecast are the main reasons for the subsequent increase of downstream flow.