CASAGRANDE FILTER Application Simple and economic measurement of groundwater pressures in soil and ...    More ...

CASAGRANDE FILTER Application Simple and economic measurement of groundwater pressures in soil and rock can be carried out using Casagrande type piezometers. Typical application include:

• Monitoring of dams, reservoirs & embankments
• Slope stability
• Groundwater levels for dewatering & drainage
• Groundwater sampling
• Permeability testing
• Contaminated soil monitoring

Geovan Porous Filter Tip is made up of low air entry porous plastic elements which are connected to standpipe tubing and lowered into a predrilled borehole. Alternative types may be driven or pushed into soft soil.

Where Casagrande type piezometers are being installed then the porous element is surrounded by filter sand and a Bentonite seal placed above this response zone.

Water level measurements are normally taken using a water level meter or in the case of artesian pressure a Bourdon pressure gauge is attached to the top. Specification Material HDPE
  Mean pore size   50 microns
  Permeability   3 x 10^-4m/s
  Porosity   35%
Description Diameter(mm) Length(mm)
  OD 30   400
  OD38   400
  OD 48   400
(Other size on request)
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