Tosunoglu, Fatih2026-03-262026-03-2620181018-46191610-23042-s2.0-85050871189https://hdl.handle.net/20.500.14901/4735This study analyses possible significant trends in streamflow data using traditional Mann Kendall (MK), modified MK tests and innovative Sen's trend method (ISTM). Monthly streamflow data of nine stations located in the Euphrates River basin, which is one of the most important water resources of Turkey, are used in the applications. The MK and ISTM provided significant decreasing trends in streamflow at the stations located in lower part of the basin while they showed significant increasing trends in stream flow of stations located in the upper part. The ISTM test results revealed that low, medium and high values of the streamflow of the station 2102 (located in the middle part) have some decreasing and increasing trends although there is no significant trend for this station according to the MK test. Moreover, according to the MK test, only a few significant increasing and decreasing trends are found for the other stations located in the middle part. However, the ISTM showed indications of more decreasing and increasing trends for medium and high stream flow values at these stations. The modified MK test is also employed to ascertain trends at the stations with serially correlated data and the results are consistent with those obtained from the MK test.eninfo:eu-repo/semantics/closedAccessEuphrates BasinMann Kendall TestStreamflowSen’s Trend MethodTurkeyArticle