The U.S. Army Corps of Engineers (USACE) Risk Management Center (RMC) developed RMC Empirical Embankment Dam Breach Parameters Toolbox as part of the RMC Breach Parameter Suite of Microsoft Excel spreadsheets to support risk assessments for dam safety. The spreadsheet tools contained in this toolbox assess the initial dam breach parameters using the empirical relationships of Bowles et al. (2014) [revised Xu and Zhang (2009)], Xu and Zhang (2009), Froehlich (2008, 1995), Von Thun and Gillette (1990), U.S. Bureau of Reclamation (1988), and MacDonald and Langridge-Monopolis (1984) as well as the peak breach outflow from various regression equations.