The effect of geology and permeability value of landslide potentials in Jatigede downstream dam area, West Java province

West Java province is potentially one of the most threat of landslide in Indonesia. The research was taken in the Jatigede region. The content that will be discussed is geomorphology, geology, geology technical, also the effect of soil permeability, which is supported by average rainfall data. The method used for permeability research research is the constant head method. Geomorphology is divided into three aspects, Which are structural hills, weathering hills, and fluvial plain. Geology area is divided by four lithology from the latest to oldest, which are alluvial plain, breccia tuff, claystone, and volcanic breccia. Geology technical are divided into small weathered, moderate weathered, high weathered, complete weathered, and extreme weathered. Soil permeability coefficient area is divided into two aspects, which is low permeability and very low permeability. Degree of soil permeability is divided into two aspects, which are half water pass zone and water pass zone. Potentially landslide is divided into two, which are moderate landslide potential zone and high landslide potential zone.