Why can't the flood discharge of Xin 'anjiang Hydropower Station be earlier and slower?

That's because flood discharge is based on the actual storage capacity of the reservoir, future precipitation, maximum storage capacity of the reservoir, displacement, discharge time and so on. , after scientific calculation and reported to the higher authorities and the government for approval.

Flood discharge is mainly rainstorm flood, which leads to the rapid rise of water level and exceeds the flood limit water level. The flood discharge scheme mainly considers the safety in the safe operation of the reservoir, the utilization of water resources, the upstream and downstream influence and the life first four factors to determine the discharge flow and time of the reservoir.

The flood limit water level is like a warning line. When it reaches this water level, it has the conditions for flood discharge, but this is not a necessary condition. It is necessary to judge whether flood discharge is really needed according to the subsequent rainfall.

Extended data:

Xin 'anjiang Hydropower Station is the main backup power source for peak shaving, frequency modulation and accidents in East China power system. By the end of 1990, the cumulative power generation was 4302 1 10,000 kwh, with a total output value of 2.705 billion yuan, 6.9 times of the total cost of the power station of 392 million yuan.

Under the condition of once-in-20-year flood, the flood peak flow can be reduced by 22% ~ 28% through reservoir operation, which can avoid or alleviate the flood disaster in Jiande, Tonglu, Fuyang and other towns and 300,000 mu of farmland downstream. During the period of 1960 ~ 1988, floods with a speed of more than 10000 cubic meters per second have been stopped 1 1 times, thus reducing the direct economic loss of 1 1 more than one hundred million yuan.

A deep-water channel of 1 10 km is formed in the upper reaches of the reservoir, and ships can fly directly from the dam to Shexian County, Anhui Province. The downstream flow is increased in dry season, and the navigation channel is improved. For example, on the section from the dam site to Meicheng, only small wooden boats can be used before the reservoir is completed. It is feasible to reduce the high temperature and frost-free period from 238 days to 263.2 days, which is beneficial to the planting of Pinus massoniana, citrus and mulberry.