The alluvium deposits (al2) of Mytilini basin bears a free water table. The limits of this table extend up to the limits of the strata itself. The substrata of this deposits are the Neogene formations, that bear the deeper water table in the basin.
Furthermore, Ampelos marbles (mr2) form a hydro-system that leads to numerous sources of different dynamic and water discharge, varying between 0.5 to 5.5 l/s. Vourliotes marbles (mr3) is the most important hydro-system of Samos, covering the area between Nerotrivias source and Mana source, to the eastern side of Karvounis mountain. Vourliotes marbles do not form a united hydrosystem but rather consist of several water systems leading to various sources, including Nerotrivias and Mana source.
The lowest series of Neogene (M.(k.m)2) form a remarkable water system that leads to water discharges up to 22 l/s. The combination of both series (Ampelos marbles and Vourliotis marbles) within Imbrassos basin lead to numerous sources, such as Fleva, Kryo Nero, Karitsa, Megali Vrissi. Further more, the intercallation of volcanic formations among this series, mostly west of Mytilini village lead to a high concentration of arsenic (As) [(:ref:dfg:giannopoulos2009hydrogeological)].
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