It is raining but the reservoirs are not filling
In recent weeks, we have been hearing the same sentence almost every day: “Rainfall has increased in Türkiye, but reservoirs are not filling.” The claim is often taken one step further and turned into the conclusion that “water must be poorly managed.” Although this interpretation may sound reasonable at first glance, it is actually a classic hydrological misunderstanding rooted in a misinterpretation of how natural systems work. Let us begin with the data. According to official figures from the State Hydraulic Works (DSİ), on December 15, 2024, Türkiye’s reservoirs held 39.2 billion cubic meters of active storage, corresponding to a filling rate of 41.6%. Following a severe drought, by December 15, 2025, stored water had dropped to 31.9 billion cubic meters, and the filling rate declined to 33.8%. In other words, the country entered the rainy season with a significant water deficit. Then the rains arrived. During the 2026 water year (October 1, 2025 – February 17, 2026), cumulative pr...