Adverse effects of dams

1. causes morphological changes of rivers and lakes, river siltation, tidal deformation and estuary siltation, which all reduce the flood storage capacity of rivers;

2. It causes the water flow to slow down, the river runoff decreases, the self-purification ability of water body decreases, and the water pollution intensifies;

3. Blocking the migration route of fish, resulting in the decrease of fish resources and the degradation of biodiversity;

4. Causes land subsidence, migration, secondary salinization of land, bank collapse and other problems.