Bogárdi J. 2023. 50+ years of water management and mismanagement, examples of international large rivers: The summary of the of János Bogárdi’lecture delivered on his inauguration as honorary member of the Hungarian Hydrological Society . Hungarian Journal of Hydrology. 103, 3 (Sep. 2023), 4-20. DOI:https://doi.org/10.59258/hk.12330.