What are lower areas within a containment structure from which liquid is collected?

The term that refers to lower areas within a containment structure specifically designed for the collection of liquid is "sumps." Sumps are typically constructed in various types of containment systems, such as tanks or storage areas, to gather fluids that may accumulate due to leaks, spills, or precipitation. Their primary function is to facilitate the safe and efficient removal of liquids, preventing overflow and minimizing the risk of environmental contamination.

Catch basins, while they do collect runoff, usually serve a broader purpose of managing stormwater drainage rather than specifically being designed for containment structures. Drainage ponds are larger features that store stormwater for various purposes, including water quality management and flood control, but they do not specifically refer to contained areas for the collection of liquids within a structure. Infiltration trenches are designed for allowing water to seep into the ground, serving a different function related to groundwater recharge rather than the collection of liquids within a containment area.