What is the purpose of subsurface drainage?
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A perforated conduit such as a pipe, tubing, or tile installed beneath the ground to intercept, collect, and convey excess ground water to a suitable stable outlet.
Where Practice Applies
Subsurface drainage is concerned with removing water that percolates through or is contained in the underlying subgrade. This water, typically the result of a high water table or exceptionally wet weather, can accumulate under the pavement structure by two chief means: Gravity flow.
To improve soil and water conditions for vegetative growth. To prevent sloughing of steep slopes due to ground water seepage. To improve stability of structures with shallow foundations by lowering the water table.