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Steponas Kolupaila (1892–1964) was an important figure in 20th century hydrology and one of the pioneers of scientific water gauging in Europe. His research on the reliability of hydrological data and measurement methods\udwas particularly important and contributed to the development of\udempirical hydrological calculation methods. Kolupaila was one of\udthe first who standardised water-gauging methods internationally. He\udcreated several original hydrological and hydraulic calculation methods (his\uddischarge assessment method for winter period was particularly significant).\udHis innate abilities and frequent travel made Kolupaila a universal\udspecialist in various fields and an active public figure. He revealed his\udmultilayered scientific and cultural experiences in his most famous book,\ud<i>Bibliography of Hydrometry</i>. This book introduced the unique European\udhydrological-measurement and computation methods to the community of\udworld hydrologists at that time and allowed the development and adaptation of these methods across the world

Steponas Kolupaila's contribution to hydrological science development