Welcome to the U.S. Army Corps of Engineers, Hydrologic Engineering Center’s (HEC) Statistical Software Package (HEC-SSP). This software allows users to perform statistical analyses of hydrologic data. The current version of HEC-SSP can perform flood flow frequency analysis based on Bulletin 17B (Interagency Advisory Committee on Water Data, 1982) and Bulletin 17C (England, et al., 2018), a generalized frequency analysis on not only flow data but other hydrologic data as well, a volume frequency analysis on high or low flows, a duration analysis, a coincident frequency analysis, a curve combination analysis, a balanced hydrograph analysis, a distribution fitting analysis, and a mixed population analysis.