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 flow frequency analyses based on Bulletin 17C (England, et al., 2019), generalized frequency analyses, volume frequency analyses, duration analyses, coincident frequency analyses, curve combination analyses, balanced hydrograph analyses, distribution fitting analyses, mixed population analyses, correlation analyses, and record extension analyses.