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How do underground tile drains work?
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land reclamation
The Yser River flowing through reclaimed farmland in Belgium.
Underground tile drains, also known as subsurface drainage systems, are used to remove excess water from soil in areas where the ground is permeable enough to allow water to move through it. By lowering the water table, these systems provide plants with a greater volume of soil for root development, help the soil warm up faster in the spring, and maintain a healthy balance of air and bacteria necessary for crop growth.123
How They Work
- System Components: The system consists of a network of conduits installed below the surface, including lateral lines that collect water from the soil and main lines that carry the water to an outlet, such as a river or a large ditch.2
- Installation: These drains are typically constructed by excavating a trench, installing the tile—traditionally made of clay or concrete, though perforated plastic tubing is now common—and backfilling the trench.14
- Design: The spacing and depth of the tile lines are determined by the soil's permeability. More permeable soils allow for wider spacing between lines.1
- Advantages: Unlike open ditches, tile drains allow farm equipment to operate across the entire field, maximizing land efficiency.1