Abstract
The extreme flash-flood of November 2017 in Western Attica, Greece, caused severe damages not only in the landward area, but also in the adjacent marine environment. The study of a number of data, such as visual observations immediately after the catastrophic event, a series of satellite images that demonstrate the movement of the flood-related suspended material, and comparative elemental and hydrocarbon geochemical analyses between the fresh, recently deposited sediments, and the older ones, have shown that an extended part of the Elefsis Bay, particularly the northeastern sector, has experienced a severe modification in its sedimentary and geochemical status, that may have irreversibly affected the already environmentally degraded marine ecosystem of the area.
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