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Mobile Geomembrane Survey System
This version of the system is carried out by a field crew using a fully portable set of equipment. At landfills, this version is used after completion of emplacement of the protective liner covering, prior to the tipping of waste. As the major cause of liner damage results from the use of heavy plant in the construction process, the walkover survey is considered to be sufficient in many cases. Modified techniques are also available for exposed geomembranes.
Long term monitoring ("permanent system")
The walkover survey can only detect the perforating damage prior to the tipping of waste. However, this may not be sufficient to ensure the long term integrity of the geomembrane. Especially at the early stages of landfilling the tipping of waste can adversely affect geomembrane integrity. Also, some hidden defects (e.g. on extrusion welds) can pass all tests and fail at a later date. The permanently installed geco system will detect this damage at the stage when the geomembrane is perforated.
The system consists of an array of sensing electrodes placed under the membrane and connected via cables to a monitoring terminal located at the perimeter of the survey area. Several modifications of a data acquisition system are available (manual, semi-automatic, fully automatic)
