Stream discharge data have long been measured and used by engineers in the design of hydraulicrnstructures and flood protection works, and in planning for flood plain use. A flood frequencyrnanalysis is the basis for the engineering design of many projects and economic analysis of floodrncontrol projects. The study was to evaluate the performance of earth2observe global reanalysisrnrunoff products obtained from ECMWF and UNIVK reanalysis in reproducing the peakrndischarges for potential use in the planning and design of water resources structures. The dailyrnpeak discharge data from 5 stations; Gilgel Abbay, Kessie, Bahirdar, Main Beles and Border inrnthe Blue Nile basin were used for the evaluation. The stations were selected based onrnindependence and randomness tests, recorded length of data and catchment area of the station.rnThe reanalysis and observed AM discharge were analyzed from daily flow for estimation ofrnextreme flow quantiles at a return period, using at-site flood frequency analysis. The widely usedrndistributions; GEV, LN3, LP3 and EV1 were used to estimate flow quantiles. For selection ofrnbest-fit distributions, method of parameters estimation and parameter estimation Easy-Fitrnstatistical software was employed. Goodness of-fit-test; Chi-square, Kolmogorov-smirnov andrnCoefficient of determination were used for selection of best fit distributions. The results indicaternthat the reanalysis runoff products (ECMWF and UNIVK) have limitation in reproducing thernpeak discharges. The ECMWF reanalysis AM discharge was overestimated for Kessie, GilgelrnAbbay and Border stations by PBIAS of -4.43, -22.30 and -131.41% respectively andrnunderestimated for Main Beles and Bahirdar stations by PBIAS of 30.08 and 39.9% respectively.rnThe UNIVK reanalysis AM discharge was overestimated for Bahirdar, Gilgel Abbay and Borderrnstations by PBIAS of -10.65, -28.90 and -68.30% and underestimated for Main Beles and Kessiernby PBIAS of 28.71 and 4.28% respectively. The annual maximum discharges extracted fromrnboth ECMWF and UNIVK runoff products were not found reliable to estimate flood quantilesrnfor design purposes. Therefore, both data have severe limitation in reproducing the peakrndischarges and estimation of flood quantiles and canâ€™t be used for design purpose before majorrncorrection is done.rnKeywords: Global reanalysis runoff, ECMWF and UNIVK reanalysis, Flow quantiles,rnEarth2Observe, Blue Nile