Which pipe system is installed underground to handle subsoil drainage water?

The correct choice is the subsoil drainage pipe, which is specifically designed for the purpose of managing excess water present in the soil beneath the surface. This type of system facilitates the removal of groundwater from areas where it could potentially cause issues, such as flooding or water accumulation in basements.

Subsoil drainage pipes are generally perforated and laid in trenches, allowing for the collection of water that seeps through the soil. This water is then directed away from structures or areas prone to saturation, enhancing the stability of the ground and protecting buildings from water damage.

While storm sewers do manage surface water runoff from rain and can be located underground, they serve a different purpose by dealing primarily with surface water rather than groundwater. Combined sewers handle both sanitary waste and stormwater but, like storm sewers, are not focused on subsoil drainage specifically. Weeping tiles are indeed similar and often used interchangeably with subsoil drainage pipes, but they are technically a part of a larger system designed to perform the same function, thus making the term "subsoil drainage pipe" more encompassing in the context of this question.