Water needs to be effectively controlled and evacuated in ground engineering structures if their function is not to be impaired. Traditionally, water has been controlled and evacuated using graded natural materials in systems such as sand drains, soak aways or others. Over the past 30 years, more and more synthetic drainage materials, as Hipertex® geotextiles, have been replacing these natural materials, improving the permeability of impervious soils.

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