Investigation of Annual Lake Water Levels and Water Volumes with ?en Innovation and Mann-Kendall Rank Correlation Trend Tests: Example of Lake E?irdir, Turkey

Lakes are the most important freshwater resources for humans. It is stated that together with population growth, unplanned urbanization, excessive water consumption, industrialization, and unconscious irrigation, global climate change causes changes in levels volumes of lakes. Lake E?irdir Turkey, which terms drinking irrigation use, was chosen as study area. level (LWL) volume (LWV) values measured between 1988–2019 were used. Dependencies annual LWL LWV examined by autocorrelation analysis, trend regression Mann-Kendall rank correlation test, ?en innovation test. The research has shown a significant decrease since 2000 1990 LWV. decreased ?1.272 to ?3.514 m ?72.980 ?1082.134 hm3 approximately 32 years. actions be taken based on determined this will help protect As result tests used our study, it there decreases both lake. climatic lake basin feeding biggest factor these reductions.