Pset_GeoObsBoreholeMWDInterval Properties for describing MWD (Measure While Drilling) intervals. IfcGeoScienceObservation/BOREHOLELOG IfcGeoScienceObservation/BOREHOLELOG Hardness Calclated Hardness from Torque and Thrust. Cracking Qualitative crack values estimated from drilling information. WaterLeakage Degree of water leakage estimated from water flow information.