Pset_GeoObsBoreholeWaterLevel Properties for describing water levels in boreholes. IfcGeoScienceObservation/BOREHOLELOG IfcGeoScienceObservation/BOREHOLELOG WaterLevel Measured distance to water level in borehole from ground surface. IsPiezometric Defines whether height measurements are made vs the piezometric surface (true) or the surface of the groundwater (false).