Francisco Nicolás Cantero-Chinchilla, Ph.D. Research Fellow, Soil and Water Div., IAS-CSIC, Spanish National Research Council, Alameda del Obispo s/n, C´ordoba 14004, Spain (corresponding author). ORCID: https://orcid.org/0000-0003-3492-6752. Email: fncantero@ias.csic.es; z12cachf@uco.es Oscar Castro-Orgaz, Ph.D. Professor, Hydraulic Engineering Area, Univ. of Cordoba, Cordoba 14071, Spain. Email: ag2caoro@uco.es Subhasish Dey, M.ASCE Professor, Dept. of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India; Distinguished Visiting Professor, Dept. of Hydraulic Engineering, State Key Laboratory of Hydro- Science and Engineering, Tsinghua Univ., Beijing 100084, China. Email: sdey@iitkgp.ac.in https://doi.org/10.1061/(ASCE)HY.1943-7900.0001608 In the original paper, the following reference is incorrect: Sarno, L., A. Carravetta, R. Martino, and Y. C. Tai. 2011. “A twolayer approach to describe granular flows over rough surface.” In Proc., 35th National Conf. on Theoretical and Applied Mechanics. This shall be replaced by the following reference: Sarno, L., A. Carravetta, R. Martino, and Y. C. Tai. 2013. “Pressure coefficient in dam-break flows of dry granular matter.” J. Hydraul. Eng. 139 (11): 1126–1133. https://doi .org/10.1061/(ASCE)HY.1943-7900.0000772. All throughout the text of the paper, Sarno et al. (2011) is to be read as Sarno et al. (2013), including the reference cited in Fig. 5. © 2020 American Society of Civil Engineers (ASCE). All rights reserved.