What are the problems of subsurface drainage?
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The main water quality concern about subsurface drainage is the increased loss of nitrates and other soluble constituents that can move through soil to drainage systems and end up in nearby surface water.
Blockages. Blockages in drains are an issue that affects every property owner at one time or another. …
Displaced/Open Joints. …
Fractures and Cracks. …
Root Intrusions. …
Collapsed or Broken Sections of Pipe.
Subsurface drainage lowers the high water tables, and the main causes of the rise in water table are precipitation, excess irrigation, leaching water, seeps from higher land or irrigation canal and ditches and groundwater under artesian pressure.
The main disadvantage of a drainage system can be the accelerated leaching out of nitrogen and other salts, causing eutrophication or the increase of the salt content of streams and rivers. Usually, the disadvantages can be avoided by using proper irrigation methods and keeping the irrigation water standards.