Precipitation patterns are assigned to basins by first selecting the appropriate basin(s) and then clicking on the precipitation button in the Edit HEC-1 Parameters dialog. If multiple basins are selected then the defined parameters will apply to all selected basins.
NOTE: If no basins are selected, the parameters can be applied to all basins.
Related Topics:
Editing HEC-1 Parameters
Gages
Basin Average
Hypothetical Storm
No Precipitation
Obtaining Precipitation Data