The objective of this article is to study the evolution of soil erosion produced by the Siret River during 1989 – 2008. The hydrophysical
and mechanic action of the river flow manifests by freeze, thaw, erosion, transportation, and alluvial deposit processes.
The researched section was delimited in a sector of Siret River bed, where the exploitation of mineral aggregates is carried out on
large areas. The influences and effects of deficient exploitation of mineral aggregates have a direct impact on the evolution forms
of Siret River. The analysis is important because of the very frequently loss of agricultural lands by river erosion in the
researched sector. Siret water catchment area, by its position and by the dimensions of the drainage network, represents a highly
varied area from the geological and morphological point of view. The section Săuceşti – Tamaşi is situated in the north-eastern
region of the Bacău County, Romania. The studied area has 1577.28 ha. After the comparative analysis of the new topographic
plan with the old soil map, soil losses were identified. The result was a total examined area of 369.46 hectares, representing
23.42% of the total researched section. For the delimited soil units, according to the homogeneity of areas, guiding requirements
must be established, having as objective the amelioration of the arable lands and grasslands.