Which component is typically not installed underground?

The downspout is typically not installed underground because it is designed to channel rainwater from the roof and direct it away from the building foundation. Downspouts are an integral part of a building's drainage system, functioning above ground to effectively manage precipitation runoff. Their placement above ground allows for straightforward maintenance and inspection, which is important for preventing clogs and ensuring that water is properly directed away from the structure.

In contrast, components like septic tanks, cisterns, and manholes are intended to be placed underground as part of their operational requirements. Septic tanks are buried due to their function in treating wastewater, while cisterns may also be underground to store rainwater or other supplies. Manholes are installed underground to provide access to underground utilities for maintenance and inspection purposes. Understanding these distinctions is crucial for effective building utility planning and implementation.