Which drainage system is specifically designed to manage groundwater?

The French drain is a drainage system specifically designed to manage groundwater. It typically consists of a trench filled with gravel or rock that contains a perforated pipe. This design allows excess groundwater to flow into the pipe, which then directs it away from areas where it could cause flooding or damage to structures. The system effectively reduces water saturation in soil, which is particularly beneficial in areas with high groundwater levels or poor drainage.

In contrast, options like gabions, filter strips, and natural grades serve different functions in stormwater management. Gabions are primarily used for stabilization and erosion control through the use of wire mesh filled with rocks. Filter strips involve strips of vegetation that help filter pollutants from stormwater runoff but are not specifically designed to manage groundwater. Natural grades pertain to the natural slope of the land and may aid in drainage but do not target groundwater management directly. The French drain's specific function of intercepting and redirecting groundwater sets it apart as the correct answer to the question.