Many dam monitoring systems use buried pressure transducers – (called piezometers) to measure the pore water pressure in the dam and define the phreatic surface. These devices are buried in a dam and can measure water pressure even with very small amounts of water being present. Piezometers in embankments monitor the phreatic surface against agreed trigger levels to maintain embankment stability. Vibrating wire piezometers, standpipes, and bores monitor groundwater mounding and outward movement beneath and surrounding the facility. This is looked at carefully against surface water and groundwater quality sampling, both upstream and downstream of the facility, to check against agreed trigger levels.
Decipher’s Monitoring Modules work in unison to pull key information from a number of diverse sources (online, offline or hand captured) into a cohesive, unified user interface. One of the key aspects of this module is the Piezometric Chart. A piezometer is a special tool that is used to take measurements within an aquifer. It is submerged within a well beneath the saturated zone, through less porous rock. Many piezometer wells are drilled within a confined aquifer at certain locations. The piezometric surface of water is the level of water within a piezometric well in a confined aquifer. It is depicted on maps as a line between the walls of a well. When several piezometric surface measurements are available, a Geotech can determine recharge and discharge rates and most importantly groundwater-flow direction and rates.