Fig.1: Gravity-variations, gravity-residuals and airpressure variations at the Conrad Observatory: Gravity-variations are measured with a superconducting gravimeter GWR-SG025. The uppermost diagram (blue) show the "relative" gravity-variation, dominated by tidal effects. Positive values indicate flood, negative values highlight ebb. By removing the tidal signal content gravity-residuals are being calculated ( central plot - green). The unit of acceleration is nm/s². The central data-curve is mainly influenced by airpressure-variations ( lower plot - magenta) and meterological effects.