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River water and suspended sediment samples were collected between 2015 and 2018 from the Narayani, Saptakoshi and Sunkoshi rivers in Nepal. Samples formed part of the Perturbations of Earth Surface Processes by Large Earthquakes PRESSurE Project (https://www.gfz-potsdam.de/en/section/geomorphology/projects/pressure/). This project aims to better understand the role of earthquakes on earth surface processes. Hydrological stations were installed on the rivers draining the epicentral area following the April 2015 Gorkha earthquake (Mw 7.9). The stations were operated for four consecutive monsoon seasons. All stations were equipped with river stage height measurements and manned daily for sampling. A small batch of river water samples were also collected from the Narayani River. These samples were collected upstream of Narayanghat using a raft between 2015 and 2017. These samples were collected at varying depths in the river. Dissolved river water ion concentrations (N=672) and sediment-adsorbed cation concentrations (N=74) were determined. Radiogenic strontium isotopes (87Sr/86Sr) of both phases were measured for a small number of paired samples (N=9). Dissolved river water anion concentrations were measured at the GFZ German Research Centre for Geosciences, Potsdam, Germany. Dissolved river water cation concentrations were measured at GFZ German Research Centre for Geosciences, Potsdam, Germany and the Department of Earth Sciences, University of Cambridge, Cambridge, UK. Sediment-adsorbed cation concentrations and radiogenic strontium isotope ratios were measured at the Department of Earth Sciences, University of Cambridge, Cambridge, UK.
