The Three Gorges Project in China affects salt-water dynamics and soil salinity in the Yangtze River Estuary. A study found that the project's reservoir discharge impacts estuarine runoff, leading to changes in water salinity and soil salinity. The discharge decrease during impoundment can cause a drop in water level and an increase in electrical conductivity, raising the risk of seawater intrusion in the estuary. The lag time for these effects to occur is around 8 to 20 days, showing how the project influences the estuarine environment.