The Present research study is conducted in the upper awash basin which is located in centralrnEthiopia at the western margin of the main Ethiopian rift. Nowadays the consumption ofrnwater for the industrial, domestic and agricultural usage in the upper awash basin dominantlyrndepends on Groundwater. Government organizations and several private companies arernengaged in construction of deep wells in the study area due to increasing population.rnHowever there is no well-organized system to monitor and manage groundwater resource ofrnthe study area. Abstraction of groundwater in the study area is increasing without givingrnproper attention to important hydrogeological factors. One such factor is recharge. To use therngroundwater without adversely affecting the groundwater table and the potentiometric level,rnthe abstraction rate need to be proportional to the groundwater recharge. The main objectivernof this research is to estimate the ground water recharge and recommend the sustainable yieldrnof the upper awash basin. To accomplish this thesis Wetspass model method is applied.rnWetspass model is water and Energy transfer between soil, plants and atmosphere underrnquasi-steady state which is a physical based model for estimation of long term average spatialrnpatterns of groundwater recharge, surface runoff, interception, soil evaporation andrnevapotranspiration from long term average meteorological data.rnMean monthly and annually recharge, actual Evapotranspiration and surface runoff wasrnestimated using wetspass model by preparing grid maps with 200m cell size of land use,rnGround water depth, soil, slope, topography and major meteorological parameters such asrntemperature, wind speed, rainfall and potential evapotranspiration. From the wetspass modelrnoutput the mean annual recharge of upper awash basin is about 110mm which accounts aboutrn11% of the total mean annual precipitation which means 1,292,280,000.00 mÂ³/year of waterrnstored in the Upper Awash Basin. In addition to wetspass model baseflow separation methodrnwas applied to estimate the recharge of Upper Awash Basin which is about 95mm/year.rnMean annual actual evapotranspiration and Mean annual surface runoff of the study area isrnabout 603mm and 310mm respectively which accounts 60% and 30% of the mean annualrnprecipitation of the study area.rnThe sustainable yield of a certain area ranges from 10% to 70% of the groundwater recharge.rnFor the upper awash basin the sustainable yield is assumed to be 40% of the mean annualrnrecharge which is about 44mm/year.