How does the addition of large amounts of water under wet conditions affect the potential for a slump to why?

The addition of large amounts of water under wet conditions increases the potential for a slump by reducing soil cohesion and increasing pore water pressure. When soil becomes saturated, the weight of the water can lead to instability, as the water forces soil particles apart, decreasing their interparticle friction. This saturation can trigger a loss of structural integrity, making it easier for materials to slide or collapse. Consequently, the combination of excess water and weakened soil structure heightens the risk of a slope failure or slump.