Advantages and disadvantages of building reservoirs in Chongming Island

Advantages and disadvantages of building reservoirs in Chongming Island: advantages, regulating river runoff. Disadvantages, increase the frequency of geological disasters in the reservoir area

Benefits of building a reservoir: regulating river runoff and improving the climate in the reservoir area (reducing temperature difference and increasing air humidity); Flood control, shipping, power generation, irrigation, aquaculture, tourism, etc.

Disadvantages of building a reservoir: increasing the frequency of geological disasters in the reservoir area. The construction of reservoirs may induce earthquakes and increase the frequency of earthquakes in the reservoir area and nearby areas. Sediment deposition. Due to sediment deposition in the reservoir area, the actual water storage capacity of the reservoir is decreasing. The soil in the downstream is salinized, and continuous irrigation makes the groundwater level rise, bringing the salt in the deep soil to the surface. The high salt content and various chemical residues in irrigation water lead to soil salinization. The water quality in the reservoir area and downstream is deteriorating. The water surface area of the reservoir area is large, a large amount of water evaporates, and soil salinization increases the salt and chemical residues in the soil, thus polluting groundwater and increasing the salt content of the downstream rivers.