In this study, a comparative evaluation of the statistical methods for daily streamflow
estimation at ungauged basins is presented. The single donor station drainage area ratio
(DAR) method, the multiple-donor stations drainage area ratio (MDAR) method, the inverse
similarity weighted (ISW) method, and its variations with three different power parameters (1,
2, and 3) are applied to the two main subbasins of the Euphrates Basin in Turkey to estimate
daily streamflow data. Each station in each basin is considered in turn as the target station …