What is the function of building a reservoir?

1, flood detention:

Flood detention is to let the flood temporarily stay in the reservoir. When there is no gate control on the spillway of the reservoir and the water level of the reservoir is flush with the elevation of the spillway crest, the reservoir can only play the role of temporary flood interception.

2. Flood storage function:

In the case of spillway without sluice gate, in the stage of reservoir management and operation, if the reservoir water level can be reduced to the reservoir flood limit level before flood season, and the reservoir flood limit level is lower than the spillway crest elevation, the storage capacity between the flood limit level and the spillway crest elevation can play a role in flood storage. Part of the flood stored in the reservoir can play a planned role in the dry season.

3. Profit function

The precipitation that falls on the ground (partially seeps into the ground) in the basin is called river runoff after it is discharged into the river in different ways from the ground and underground. Due to the variability and non-repetition of river runoff, the incoming water is different from year to year, from season to season, and from region to region.

Most water conservancy departments (such as irrigation, power generation, water supply, shipping, etc. ) need a relatively fixed water consumption and water consumption time, and their requirements are often not fully adapted to natural water supply.

In order to solve the problem of redistribution of runoff in time and space and fully develop and utilize water resources to meet the requirements of water conservancy departments, people often build some reservoir projects on rivers. The beneficial function of the reservoir is to regulate runoff, store flood and make up for drought, so that natural water can meet the requirements of the water conservancy department in time and space.

Extended data:

China is one of the countries with serious flood disasters in the world. During the two thousand years from 206 BC to 1949 BC, there were 1029 major floods, which occurred once every two years on average.

In this long time, the working people in our country have fought hard for flood control and disaster reduction, and paid a lot of labor, but they still can't escape the flood disaster. Therefore, the flood disaster has always been regarded as the concern of our people. ?

Reservoir dam plays an important role in flood control, irrigation, power generation and water supply.

After the founding of New China, the CPC Central Committee and the State Council attached great importance to river flood control projects, relied on the masses to carry out large-scale river regulation, and built a large number of river-blocking reservoirs and dam projects.

By the end of 200 1, all kinds of reservoirs have been built in China. More than 85,000, including 4.33 million large reservoirs with a storage capacity of 65.438 billion m3. There are 2,736 medium-sized reservoirs with a storage capacity of100000 m3, and nearly 82,000 small reservoirs with a storage capacity of100000 m3.

The total reservoir capacity is 528,654.38 billion cubic meters, including 392.7 billion cubic meters for large reservoirs, 75.8 billion cubic meters for medium reservoirs and 59.6 billion cubic meters for small reservoirs. These reservoirs are all over the hilly areas of the country, and have played a huge economic role in flood control, irrigation, power generation, urban and rural water supply, shipping, aquaculture and so on. ?

In terms of flood control, according to preliminary statistics, 245 large reservoirs distributed in seven rivers in China control the basin area of 1.50 km2 upstream of the reservoirs, accounting for 34% of the total basin area of seven rivers, accounting for about one third, which can greatly control floods.

1In August, 963, Daqing River, Ziya River and Zhangwei River in Haihe River Basin of Hebei Province were hit by heavy rains and floods. Large reservoirs such as Gangnan and Yuecheng 16 in this area impounded 4.35 billion cubic meters of flood water, accounting for 46.2% of the 9.42 billion cubic meters of flood water in the upper reaches, and nearly half of the total flood water was impounded.

It has played a decisive role in reducing the flood disaster in the vast Hebei plain downstream, especially in ensuring the safety of Tianjin and Jinpu railways.

People's Network-Dam safety can not be ignored