Abstract The Blue Nile Basin is located in the Eastern region of the African Continent and covers most of the Ethiopian plateau highlands with an elevation of 2000 to 3000 meters above Mean Sea Level. The climate of the Ethiopian highlands is based on atmospheric circulation which follows the tropical division (Hurst et al., 1931). The main objective of this research is to determine the life span of GERR by using remote sensing techniques and by the aid of hydrological model Watershed Storm Hydrograph Model (WASHMO) that was established by Andy Ward, 1986. Hydrological parameters were extracted from Digital Elevation Model (DEM) of Shuttle Topographic Radar Mission (STRM). Other parameters that concerns rainfall, soil characteristics and land covers were collected and inserted in the mentioned model in order to determine water discharge and sediment yield from the Blue Nile Watershed.