What does a subsoil drain do?

A subsoil drain is specifically designed to collect and redirect subsurface water, helping to manage groundwater levels and prevent issues such as soil saturation and flooding. This system typically involves perforated pipes placed below the ground surface that receive excess water from the surrounding soil. By effectively managing subsurface water, subsoil drains play a crucial role in protecting both landscapes and structures from water-related damage.

The function of a subsoil drain is distinct from other options in the question. Disposing of sewage waste involves different plumbing systems, such as sanitary sewers. Housing rainwater pertains to systems like rain barrels or cisterns, which are not directly related to subsurface drainage. Lastly, storing surface water would typically involve retention ponds or similar structures, which are designed to hold water temporarily on the surface rather than managing it below ground. Hence, the purpose of collecting subsurface water aligns precisely with the function of a subsoil drain.