Simple, reliable open-tube piezometer for manual groundwater level monitoring and permeability testing.
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Simple, reliable open-tube piezometer for manual groundwater level monitoring and permeability testing.
The Geolook Standpipe Piezometer (often called a Casagrande Piezometer) is the most basic and reliable method for monitoring groundwater levels in permeable soil and rock. The system consists of a porous intake filter tip (Casagrande tip) connected to the surface by a rigid PVC riser pipe. Groundwater flows through the porous tip and rises inside the pipe until it equalizes with the surrounding water table. Readings are taken manually by lowering a water level indicator (dip meter) down the pipe.
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Unlike VW sensors which connect to a readout box, the Standpipe Piezometer is read manually.
An operator lowers a 'Water Level Indicator' (a probe on a graduated tape) down the riser pipe. When the probe touches the water surface, a buzzer sounds. The depth is then read directly off the tape at the top of the pipe casing.
Because water must physically flow in or out of the standpipe to change the level, there is a 'hydrodynamic time lag'.
In sandy (permeable) soils, response is instant. In clay (impermeable) soils, it may take days for the level to stabilize. For rapid response in clay, we recommend the G75-V850 (VW Piezometer) instead.
For accurate pore pressure measurement (rather than just water level), we use a 'Casagrande Tip'.
This is a specialized porous element sealed into a specific zone of the borehole with bentonite grout. This isolates the intake zone, ensuring the water level in the pipe represents the pressure at that specific depth, not just the general water table of the entire borehole.
Unlike VW sensors which connect to a readout box, the Standpipe Piezometer is read manually.
An operator lowers a 'Water Level Indicator' (a probe on a graduated tape) down the riser pipe. When the probe touches the water surface, a buzzer sounds. The depth is then read directly off the tape at the top of the pipe casing.
For accurate pore pressure measurement (rather than just water level), we use a 'Casagrande Tip'.
This is a specialized porous element sealed into a specific zone of the borehole with bentonite grout. This isolates the intake zone, ensuring the water level in the pipe represents the pressure at that specific depth, not just the general water table of the entire borehole.
Because water must physically flow in or out of the standpipe to change the level, there is a 'hydrodynamic time lag'.
In sandy (permeable) soils, response is instant. In clay (impermeable) soils, it may take days for the level to stabilize. For rapid response in clay, we recommend the G75-V850 (VW Piezometer) instead.
We are currently updating the specific model configurations and technical datasheets for this product category.