A simple and economic measurement of groundwater pressures in soil and rock can be carried out using Casagrande type piezometers which are made up of low air entry porous plastic or ceramic elements 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 (dipmeter) 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 diameter: 26.4 x 19mm
Standpipe Thread: ¾” BSPM
Standpipe length: 1, 3m

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