Sand drain & PVD's
Sand drains is a process of radial consolidation which increase rate of drainage in the rate of drainage in the embankment by driving a casing into the embankment and making vertical bore holes. These holes is back filled with suitable grade of sand. Process of construction of drains.
Prefabricated Vertical Drains (PVDs) or 'Wick Drains' are composed of a plastic core encased by a geotextile for the purpose of expediting consolidation of slow draining soils. ... Pore water will flow laterally to the nearest drain, as opposed to vertical flow to an underlying or overlying drainage layer
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