WisanggeniP., ImanantoE.I. and YudiantoE.A. 2020. SOFT SOIL IMPROVEMENT USING PREFABRICATED VERTICAL DRAIN (PVD) (Study Location of Grand Island Pakuwon City Surabaya, East Java): Study Location: Housing Development at Grand Island Pakuwon City Surabaya, East Java. STUDENT JOURNAL GELAGAR. 2, 2 (Dec. 2020), 28-35.