Regional Frequency Analysis for Annual Maxima Precipitation Data Measured in Ankara Province

In this study, regional frequency analysis of precipitation data is carried out through methods of lmoments in ankara province. annual maxima precipitation series are formed using daily precipitation records obtained from 32 rainfall gauging station. firstly, whole stations are assumed one region and then stations are split up three region using cluster analysis due to discordant stations. a set of analysis is carried out through index-flood procedure and regional homogeneity is obtained and suitable probability distribution is selected for each region and probable design precipitation values are estimated for various return periods (t year= 2, 5, 10, 25 and 100) via regional l-moment algorithm. monte carlo simulation experiments are applied and regional growth curve components are obtained and absolute bias, bias and root mean square errors (rmse) of estimated quantiles are computed for assessment of the accuracy of estimated precipitation quantiles.