Where are subsoil drains typically installed?

Subsoil drains are designed to manage groundwater and prevent water accumulation around foundations, which can lead to structural issues. They are typically installed under the lower-level or basement floor because this positioning directly addresses potential water intrusion by collecting and redirecting subsoil water before it reaches the foundation. The placement of these drains allows for the effective removal of excess moisture, which is crucial for maintaining a dry and stable foundation, especially in areas with high water tables or significant rainfall.

While other locations mentioned, such as roofs or attics, are important for other drainage systems, they do not serve the same purpose as subsoil drains, which are specifically meant for subterranean water management. Aboveground installations around the perimeter might also handle surface water, but they do not deal with the subsoil, where the potential for water-related issues is greater. Thus, the correct choice emphasizes the relevance of subsoil drains in basement areas to mitigate water accumulation effectively.