Millau Viaduct slightest movement in the Viaduct, and measure its resistance to wear-and-tear over time. Anemometers, accelerometers, inclinometers, temperature sensors are all used for the instrumentation network. Twelve fibre optic extensometers were installed in the base of pylon P2. Being the tallest of all, it is therefore under the most intense stress. These sensors detect movements on the order of a micrometre. Other extensometers, electrical this time, are distributed on top of P2 and P7. This apparatus is capable of taking up to 100 readings per second. In high winds, they continuously monitor the reactions of the Viaduct to extreme conditions. Accelerometers
Le Pouget (power station) the south of the river the land rises again to over 600 m. The area is called Les Raspes de Tarn- 30 km to the east is the A75 autoroute and the Viaduc de Millau which crosses the Tarn and Dourdan at the level of the plateau. Further east is the town of Millau and the Karst landscape of the Gorges du Tarn. The impervious granites of the Lévézou make this a suitable location for water capture. The catchment area of Le Pouget is extensive. The Alrance valley was dammed at Villefranche-de-Panat, creating the 197 hectare Lac de Villefranche-de-Panat. The