International Scientific Conference GEOBALCANICA 2019 69 DIFFERENTIATION OF SEDIMENTS IN THE SUCHEDNIÓW WATER RESERVOIR (ŚWIĘTOKRZYSKIE VOIVODESHIP, POLAND) DOI: http://dx.doi.org/10.18509/GBP.2019.09 UDC: 627.81:551.31.051(438) Tomasz Kalicki 1 Paweł Przepióra 1 Piotr Biesaga 2 Piotr Kusztal 2 Marcin Frączek 1 Michał Aksamit 2 Paulina Grzeszczyk 2 Edyta Kłusakiewicz 2 Mariusz Chrabąszcz 2 1 Institute of Geography, Jan Kochanowski University in Kielce, Poland 2 Student Science Club of Geomorphologists „Złoty Bażant”, Jan Kochanowski University in Kielce, Poland ABSTRACT The Suchedniów water reservoir was built in 1974 in the middle section of Kamionka river (Świętokrzyskie voivodeship in Poland) in the area of earlier industrial water reservoirs existing here during the Old Polish Industrial District time. Research carried out after drainage of this reservoir in 2017 showed that the pond has preserved forms and sediments documenting contemporary anthropogenic activity (fireproof clay layer, inland fan delta), historical marks (lacustrine sediments of older reservoirs), as well as traces of catastrophic event (sandy mega ripple marks formed after suddenly drainage caused by dam breaking in 1974). Field and laboratory analysis allowed to gather information on the grain size differentiation of sediments in the reservoir area. Keywords: sedimentology, Suchedniów water reservoir, lacustrine sediments, fan delta, mega ripple marks INTRODUCTION The beginning of the metallurgy in the Holy Cross Mountains is date to the Roman period [1], [2], and later development based on hydropower it had its beginning in the Middle Ages. There were many forges and watermills in the Old Polish Industrial District area (northern part of Holly Cross Mountains). Those objects were built near the rivers on which were created industrial ponds, in this way forming anthropogenic small-scale water retention system (ASWRS), typical for many bigger and smaller watercourses in this region. The fall of these forges at the beginning of the 20 th c. led to the disappearance of ASWRS, and in the place of some of the old ponds were built bigger reservoirs [3]. An example is the Suchedniów water reservoir, built in 1974 in the middle section of Kamionka river (right-side tributary of Kamienna river), in the northern part of the Świętokrzyskie voivodeship [4], [5]. In 2017, hydrotechnical works were carried out on the reservoir area to restore its retention functions. After draining the reservoir was began works to deepen its basin, in this way gave the opportunity to study sediments accumulated for over 40 years.