What defines a trench in an excavation context?

In excavation terminology, a trench is specifically defined as an excavation that is deeper than it is wide. This characteristic is critical because it distinguishes trenches from other types of excavations. The depth generally exceeds the width significantly, allowing for their use in specific applications such as installing utility lines, pipelines, or drainage systems. This shape ensures the trench can serve its purpose effectively while also influencing how safety measures are applied, such as shoring practices to prevent collapses.

The other options do not encapsulate the full definition of a trench. A shallow dig typically refers to a less defined or restricted excavation that doesn't meet the criteria of being deeper than wide. A narrow confined space does not adequately describe the depth aspect that is crucial to understanding a trench. Lastly, a temporary storage area for soil relates to the management of excavated materials rather than the physical characteristics of the trench itself. Thus, the defining features of a trench focus on its intended construction geometry.