What characteristic of gravel makes it particularly useful for construction foundations?

Gravel is particularly useful for construction foundations primarily due to its characteristic of good drainage. This property allows water to flow through and around the gravel, which is crucial for preventing issues like water pooling or saturation that can weaken soil and lead to structural problems over time. Effective drainage helps maintain the integrity of the foundation, as it mitigates the risk of hydrostatic pressure that can compromise structural stability.

In construction, a foundation that can adequately manage water flow will also reduce the risk of frost heave in colder climates and erosion in areas with significant rainfall. Gravel's texture and composition facilitate quick drainage while providing a stable base, making it an ideal material for foundation work where moisture management is a key concern.

This focus on drainage is particularly relevant in the context of soil behavior, contrasting with materials that may retain moisture, leading to various complications in foundation performance.