Hydrological characteristics of the Tigris River at the Baghdad Sarai station

With a length of 1900 Km, the Tigris River flows from South eastern Turkey to five eastern tributaries. It has an average mean discharge at the Baghdad Sarai Station of 916 m3/s for 90 years and an average mean of 615 m3/s for the last 30 years. The probable maximum and minimum discharges during the study per-iod are calculated using statistical analysis, with 10% and 90% probabilities. The analysis results show that the Gamble method is more dependable than the other methods, which is proven with actual flood mea-surements in 1941 (7637 m3/s) and 1954 (7100 m3/s) for a 100-year returning period. The data records of discharges between two periods of 1906-1946 and 1930-2019 are covered in this study. Overall, in the last 30 years, the flow discharges have decreased by 33% from monthly means mainly because of the con-struction of Turkey's GAP project, especially the Ilisu Dam.(c) 2022 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Ain Shams Uni-versity. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/ by-nc-nd/4.0/).