Installation technique of elongated sensors in river dykes

During a flood event river dykes are subject to a temporally limited hydraulic load. As a result, transient seepage through dykes takes place, which can be accelerated due to an initially higher degree of soil water content caused by a precursory flood event or by extensive precipitation. In order to observe the distribution of the water content inside dykes, a monitoring system based on spatial TDR has been developed with a new type of sensor adjusted for the use in boreholes. The installation procedure for the borehole-sensor is based on conventionally drilled boreholes and is therefore suitable for any kind of geotechnical purposes