Monitoring the settling of the river pier supporting the Inn valley expressway bridge at Kufstein, Austria

The author describes the measuring method used which comprised a differential level monitoring system based on interconnected water vessels.

Erosion of the bed of the River Inn at Kufstein led to the sudden settling of an expressway bridge. The bridge was part of an important international communications link and its prompt repair was eagerly awaited. One problem for the engineers involved in the repair work was the monitoring of the settling of the bridge.