HEC-HMS Technical Reference Manual Uncertainty Current: Available Uncertainty Analysis Methods PDF Download PDF Download page Available Uncertainty Analysis Methods. Current page All pages Available Uncertainty Analysis Methods The following methods are available for basin and precipitation parameter sampling Simple DistributionMonthly DistributionRegression with Additive ErrorSpecified ValuesA Tutorials and Guides on applying the Simple Distribution and Regression with Additive Error Uncertainty Analysis Methods are available here: Applying the Uncertainty Analysis Compute Option in HEC-HMS. An application of the Specified Values Uncertainty Analysis Method are available here: Summarizing Student Results from the Basic HEC-HMS Final Project ×