Flood always occurs in almost all cities in Indonesia. Likewise in sub DAS Keramasan. Keramasan river in administrative arca’s Palembang pronc to flooding. The natural faetors take cfifcct such as high rainfall intensity, low topographic, whcrcas non natural faetors such as many development and rubbish around the river. The purpose of this study is to mapping llood’s arca in sub DAS Keramas…