Simple and economic measurement of groundwater pressures in soil and rock can be carried out using Casagrande type piezometers.
Geosense® piezometers are made up of low air entry porous plastic or ceramic 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 (dip meter) or in the case of artesian pressure a Bourdon pressure gauge is attached to the top.
|Materials||HDPE, Alumo Silicate, PVC|
|Tip pore size||60µ|
|Tip permeability||3 x 10-4 m/s|
|Standpipe Thread||¾” BSPM|
|Standpipe length||1, 3m|