Estimating the long-term evolution of river bed levels using hydrometric data Jérôme Le Coz, Graeme Smart, Murray Hicks, Valentin Mansanarez, Benjamin Renard, Benoît Camenen and Michel Lang E3S Web Conf., 40 (2018) 06003 Published online: 05 September 2018 DOI: 10.1051/e3sconf/20184006003