A piezometer's a small diameter observation well used to measure the hydraulic head of groundwater in aquifers. Similarly, it may also be a standpipe, tube, vibrating wire piezometer or manometer used to measure the pressure of a fluid at a specific location in a column. Piezometers should ideally have a very short screen and filter zone, so that they can represent the hydraulic head at a point in the aquifer. If the filter zone's located at a specific isolated depth, the piezometer's defined pu… (More on Piezometer)