A standpipe normally contains plastic pipes with perforated holes at the base with the annular space between the perforated tube and casing filled with gravel or sandl. Under such an arrangement,a standpipe can be used to measure water level of a certain region. A standpipe piezometer however, is a type of piezometer which measures pore water pressure at a certain level. It consists of plastic pipes without holes and perforated tip on the piezometer The annular space between the tip of the piezometer and soil is filled with sand while the annular space between other parts of plastic tube and soil is filled with cement/bentonite grout to seal off water from entering the region of piezometer tip. This enables the pore water pressure in the region of piezometer tip to be measured. In essence, standpipe piezometers are installed to study the pore water pressure of a specified depth below ground
Glossary for Water Quality Testing Terms
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