Addendum to “Hydrometric Data Rescue in the Paraná River Basin” by Andrés Antico, Ricardo O. Aguiar, and Mario L. Amsler

Abstract

Antico et al. (2018, https://doi.org/10.1002/2017WR020897) made available the longest hydrometric record (1875–2017) of the Paraná River of South America, one of the 10 largest rivers in the world. The oldest part of this record (1875–1883) has low accuracy because it was obtained from a hand-drawn plot of the time series of daily water levels at Rosario City, Argentina. Here we overcame this data limitation by digitizing more accurate typewritten daily water levels observed at Rosario in 1875–1883. The digitized levels were referenced to the modern datum, subjected to quality checks, and corrected for errors caused by a gradual gauge sinking. A rating curve was used to convert water levels into discharges. Interestingly, our data capture the extreme Paraná flood associated with the very strong 1877–1878 El Niño.