This research mainly dealt the development of intensity duration frequency curves for BahirrnDar city from annual maximum daily rainfall data by using simple scaling method. Regardingrnthe rainfall data, 41 years of daily rainfall data and 4 years sub hourly and hourly rainfall datarnwere collected from National Meteorological Agency (NMA) in Addis Ababa, Ethiopia.rnHydrological data checking was conducted which were mainly testing for independence,rnstationary, homogeneity and outliers of the rainfall data. And the data were foundrnindependent, stationary, homogenous and with no outliers. There were missing data for 12rnmonths in 1991, 2005 and 2014 and in-filling of the data were done using simple averagernmethod.rnBy using easy fit software, it was possible to know that the annual maximum daily rainfallrndata to Bahir Dar city followed the general extreme value(GEV) distribution function and thernthree parameters of the distribution function were also determined. The annual maximumrndaily rainfall were found to be time scale invariant which helped to develop the intensityrnduration frequency relationships and curves using simple scaling method. The scalernexponents of the scale factor was found constant in two ranges of durationsrnand . Because of the distinction of the linearity of the slopes for these tworndurations, it was possible to detect the slopes difference at one hour duration.rnThe automatically 15 minutes intervals recorded for 4 years (2012-2015) rainfall data werernthe back bone of the successful development of the curves for Bahir Dar city. Therndetermination of the design daily rainfall for 2 years, 5 years, 10 years, 25 years, 50 years,rnand 100 years return periods was done. The comparison of the regional IDF curves andrnsimple scaling method generated IDF curves showed that the intensity of the simple scalingrnmethod generated curves were higher value than the intensities generated using the regionalrnIDF curves. Moreover, the 24 hour rainfall values calculated from simple scaling model fallrnabove the design rainfall values calculated from observed rainfall data for different selectedrnreturn periods using frequency factor method. In addition, the comparison of the regional IDFrncurves, observed IDF curves, and simple scaling IDF curves were also analyzed in order tornunderstand and check the performance of simple scaling modeling with regards to thernobserved rainfall data. Based on this analysis, it was learnt that the intensities or rainfallrnvalues from simple scaling model fall above the values of the observed rainfall or intensityrnvalues. In contrary, the values from regional IDF curves fall below both observed rainfall andrndesign rainfalls calculated values. This proved that simple scaling model performs better thanrnthe regional IDF curves. From the study, it was also possible to learn that the intensities atrnshorter rainfall durations are higher than the intensities at longer rainfall durations.