In June 1997, a Leica TCA2003 Automated total station was installed near the dam, on the stable right slope, to permanently monitor, with the greatest accuracy, the position of 16 reflectors located on the left slope, with elevations varying from 1730 metres to 2100 metres. The distance from measurement station to target ranges from 170 to 1500 metres. Each of the reflectors is located on a concrete pillar and protected from inclement weather. Two of the 16 targets, located on the left and right side of the basin, are fixed points.
The measurement station consists of Leica TCA2003 Automated total station and APS system software. The TCA2003 is located on a very stable pillar enclosed in a building equipped with special glass windows. The application processor is also housed in the shelter. The APS system software controls the measurement procedure based on a point selection made by the operator during a <<learn>> procedure. The measurement procedure can be easily modified by the operator if necessary.
ENEL configured their system so that several measurements cycles would be made every day, starting at selected time intervals. Measurement sequences are defined to begin and end on non-moving control points which have known coordinates.