Reservoir function

The role of the reservoir:

The main role of the reservoir as a water conservancy project building is that the reservoir can be used as a domestic water source for many cities. On the other hand, many reservoirs are major water diversion The source reservoirs of projects, such as the South-to-North Water Diversion Project, use some reservoirs.

Reservoirs can play a role in flood control. If there is no reservoir storage, the water in the upper reaches of the river will change with the rainfall, and people in the lower reaches may face floods at any time.

Reservoirs play an important role in agricultural irrigation. Small reservoirs are an important water source in rural areas, ensuring drinking water for the rural population. They can also be used for agricultural irrigation to ensure the normal growth of crops.

What conditions are needed to build a reservoir:

1. The dam site is at the outlet of a river, canyon or basin or depression (pocket-shaped area is conducive to dam construction: the project volume is small and the cost< /p>

Low, large reservoir capacity)

2. Choose a place with good geological conditions and avoid karst landforms and faults

3. Climatic and hydrological conditions: ensure water quantity Adequate

4. Consider whether resettlement is required for the construction of the reservoir, and the situation of land relocation, so as to minimize flooding of residential areas.

Analysis of pros and cons of building a reservoir:

1. Advantages of building a reservoir:

Regulate river runoff and improve the climate of the reservoir area (reduce temperature differences, increase air humidity ): Flood control, shipping, power generation, irrigation, aquaculture, tourism, etc.

2. Disadvantages of building a reservoir:

(1) Increase the frequency of geological disasters in the reservoir area. Building a reservoir may induce earthquakes and increase the frequency of earthquakes in the reservoir area and nearby areas. .

(2) Silt accumulation. Silt accumulation in the reservoir area has caused the actual storage capacity of the reservoir to continue to decrease.

(3) Soil salinization in the downstream land. Continuous irrigation also causes the groundwater level to rise, bringing the salt in the deep soil to the surface, plus the salt in the irrigation water and various chemical residues. High levels lead to soil salinization.

(4) Deterioration of water quality in the reservoir area and downstream. The water surface area in the reservoir area is large, and a large amount of water is evaporated. The salinization of the soil increases the salt content and chemical residues in the soil, thereby polluting the groundwater. Increased salinity in downstream river water.

(5) Impact on the downstream river channel. Due to changes in water potential and sediment content, the river flow direction and alluvial degree of the downstream river section may also be changed, causing the river bed to be severely eroded and eroded into the river (sea) The mouth recedes toward land.