The interaction between displacements and water level changes due to natural and anthropogenic effects in the Po Plain (Italy): The different point of view of GNSS and piezometers

•In Bologna (Northern Italy) water withdrawals were significantly reduced in 2010.•Piezometric, CGNSS and rainfall time series have been compared.•Several piezometers undergo a clear increase in the water level after 2010.•Thanks to PCA we spotted the effect of withdrawals reduction in the CGNSS data.•Rainfall-related hydrological response strongly depends on the geological setting.