piezometer is a device used to measure the fluid pressure in a system by measuring the height at which the liquid column rises against gravity, or a device that measures pressure (more precisely, piezometric head). ) groundwater at some point. The piezometer is designed to measure static pressure, and thus differs from the pitot tube because it is not directed to the fluid stream.
The observation well provides some information about the water level in the formation, but it must be read manually. Electric pressure transducers of several types can be read automatically, making data acquisition more convenient.
Video Piezometer
Ground water measurement
The first piezometers in geotechnical engineering are the open wells or standpipes (sometimes called Casagrande piezometers ) fitted to the aquifer. A Casagrande piezometer will usually have a solid casing down to the depth of the flower, and a hollowed or filtered casing inside a zone where water pressure is being measured. The casing is sealed into a borehole with clay, bentonite or concrete to prevent surface water from polluting the groundwater supply. In a free aquifer, the water level in the piezometer will not exactly coincide with the water table, especially when the vertical component of the flow velocity is very significant. In aquifer confined under artesis conditions, the water level in the piezometer shows the pressure in the aquifer, but not necessarily the water table. Piezometer wells may be smaller diameter than production wells, and the diameter of 5 cm booths is common.
Piezometers in durable casing can be planted or pushed to the ground to measure groundwater pressure at the point of installation. The pressure gauge (transducer) can vibrate-wire, pneumatic, or strain-gauge in operation, converting the pressure into an electrical signal. These piezometers are delivered to surfaces where they can be read by data loggers or portable reading units, allowing for faster or more frequent readings than is possible with open standpipe piezometer.
Maps Piezometer
See also
- Rheometer
- Tensiometer (soil science)
References
http://www.epa.gov/oust/cat/wwelldct.pdf
Source of the article : Wikipedia
0 Comments