 Regional rainfall runoff modeling is an old but still mostly outstanding problem in the hydrological sciences. Traditional models degrade significantly in performance when calibrated for multiple basins together instead of for a single basin alone. By training a single LSTM model on 531 basins from the Camels dataset, we were able to significantly improve performance. This article was authored by F. Krotzert, D. Klotz, G. Shalev, and others.