Pulasan River is located in Sijunjung District, Sijunjung Regency, West Sumatra Province. Geologically included in the Solok Map sheet, the research was did in an area of 9 x 9 km which contains several formations including the Kuantan Formation (Pckl), Ombilin Formation (Tmol) and Granite Intrusion (g). Morphologically, the study area is located at an elevation of 200-500 meters above sea leve…