Contamination and Protection of Ground Waters in the alluvial Sediments of the Bregalnica River in the Delčevo Region, depending on their Hydrogeological Characteristics

Abstract

The alluvial sediments in the Delčevo region are a two layer porous environment built of differentgranulometric and filtration characteristics. The lower layer is a coarse porous water-bearing environment presentas a gravel sandy series (K = 96 – 276 m/day) and finer-grained granulometric sands with clay interlayers the filtrationcoefficient being K = 1.73·10–2 – 17.28 m/day, underlying a layer of rather weaker filtration characteristics madeup of sandy clays (K = 2.16·10–3 m/day), and dusty sands the filtration coefficient being K = 3.15·10–2 m/day. Thelithological-hydrogeological characteristics of the cover sediments do not provide sufficient protection of ground watersagainst contamination of the Bregalnica alluvion in the Delčevo region and pertain to the waters endangered fromcontamination.