In term of vacuum preloading model, vacuum pressure was applied into PVD. I try to apply negative pressure head into boundary condition and line. In example for -70 kPa vacuum pressure, I apply pressure head which is -7 m along PVD length. The settlement result is not quite good due to immediately settlement, is more than field measurement about 30 cm. I want to ask about how can apply vacuum pressure into SIGMA/W (geostudio 2018 R2) for another user.