After the Dam destruction on June 6, 2023, the Kakhovka Reservoir was extremely drained. However, the water occurrence varies in the different areas during the year. The frequency of water occurrence is an important driver for climate, hydrology, appearance, and differentiation of new habitats. In this paper, we have performed the water occurrence mapping of the Kakhovka Reservoir from June 20, 2023, to May 25, 2024. For each selected date of the study period, we have used Sentinel-2 imagery to obtain water masks based on the Normalized Difference Water Index (NDWI). It revealed that the flooded area of the reservoir’s bottom changed significantly and occupied from 49.9% in March to 9.8% in September and 11.4 % in October. As a result, the obtained water occurrence map was divided into 4 groups, from areas never covered by the water to those with permanent water occurrence. Group 1 refers to the most extensive zone (41.5% of the Reservoir area), which includes the sandy eolian massif of Velikiy Kuchugury and high floodplains. Group 2 constitutes a zone (20.8%) of near-channel sandy and detrital accumulative surfaces, flat, silt-covered surfaces favorable for vegetation. Group 3 (29.6 %) represents a zone of small floodplain lakes and lowered sections of former floodplains, coastal wet areas where groundwater and surface water are discharged from streams and tributaries. Group 4 (8.1%) includes the main channel of the Dnipro, some of its straits, the Belozersky estuary, the cooling pond, and numerous lakes.
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