What factor contributes to coffins becoming displaced in flood-prone areas?

Coffins in flood-prone areas can be displaced primarily due to high water tables. A high water table indicates that groundwater is close to the surface, particularly in regions susceptible to flooding. When heavy rains or flooding occurs, the surrounding soil becomes saturated, which can lead to the buoyancy of coffins, especially if they are not significantly anchored. As the water level rises, the pressure increases, causing coffins to float and become displaced from their intended burial sites.

The other factors, while they may have some relevance in different contexts, do not directly contribute to the displacement of coffins in the way that high water tables do. For instance, reinforced burial sites might help prevent displacement rather than contribute to it, soil composition can affect drainage but not necessarily lead to displacement under flooding conditions, and population density does not directly influence how coffins react in a flood scenario. Thus, high water tables are the most significant factor in this situation.