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Hydraulic Piezometer

The Hydraulic Piezometer is used for accurately measuring pore water pressures in fully or partially saturated soil and rock. The system comprises a porous ceramic piezometer tip sealed into the measuring horizon and connected to a remote measuring position via twin nylon hydraulically filled tubes. The piezometer measures overall hydraulic pressure from which pore pressures can be calculated.

For the measurement and control of water pressures in soil and rock, the Hydraulic Piezometer is able to measure both positive and negative pressures.

Operation

The Hydraulic Piezometer is designed for the accurate measurement of pore water pressures in fully or partially saturated soil and rock.

The Piezometer tip comprises a porous ceramic filter vessel. Twin hydraulic tubes connect each filter tip to a remote reading terminal where the hydraulic pressure may be read by either a Bourdon gauge or an electrical pressure transducer.

The hydraulic system is flushable so that air or gas accumulation at the piezometer filter tip which can produce reading inaccuracies and time lag, can be fully removed to provide a ‘hard’ hydraulic circuit.

In addition, the hydraulic piezometer system may be used for constant head permeability testing of the ground in which the piezometer tips are installed.

Applications

Piezometers are used in geotechnical, environmental, and hydrological applications. They can be installed in boreholes and placed in fill materials or open wells to measure water levels or pore water pressures to enable engineers to verify design assumptions and control placement of fill.

Typical applications include:
•For environmental management including landfill sites
•Monitoring of aquifers
•Monitor tidal effects on coastal soils
•Dams
•Embankments
•Potential landslide sites
•Dewatering excavations
•Tailings lagoons
•Pumping tests
•Monitor seepage
•Control placement of fill

Ordering Information
Hydraulic Piezometer Tips

W2-1.6 Bull Nosed HAE piezometer tip; high resistance to air entry (1 Micron), for ¼inch tubing
W2-1.10 Cylindrical LAE piezometer tip; low resistance to air entry (60 Micron), for ¼inch tubing
W2-1.9 Cylindrical LAE piezometer tip; low resistance to air entry (60 Micron), for 3/16 inch tubing
W2-1.13 Push-in LAE piezometer tip; low resistance to air entry (60 Micron), for ¼inch tubing
W2-1.15 Push-in HAE piezometer tip; high resistance to air entry (1 Micron), for ¼inch tubing
W2-1.11 Push-in LAE piezometer tip; low resistance to air entry (60 Micron), for 3/16 inch tubing
W2-2.12 Push-in HAE piezometer tip ; high resistance to air entry (1 Micron), for 3/16inch tubing