Hydraulic potential of the Lower Vistula (Poland) Michal Szydlowski, Romuald Szymkiewicz, Dariusz Gasiorowski, Jakub Hakiel and Piotr Zima E3S Web Conf., 40 (2018) 03011 Published online: 05 September 2018 DOI: 10.1051/e3sconf/20184003011