Civil Engineers, planners and contractors aim for direct economic highways, airports and other traffic routes using natural resources as efficiently as possible in their construction: this often means having to build on poor soils and sometimes even to reclaim land. In many cases, the sub-grade is too weak to allow construction to proceed at a normal rate. 
Soft, cohesive soils are very slow to consolidate. 90% settlement often takes 20-25 years without the use of Prefabricated Vertical Drains (PVD's).Prefabricated vertical drain (PVD), provides an economical solution to this issue.
The principle feature of prefabricated vertical drain (Colbonddrain) lies in providing much shorter and highly permeable drainage paths for the dissipation of excess porewater pressure, allowing 90% consolidation in a time period of months, rather than years.
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