Geopak Drainage culvert analysis

Hi,

I am modeling a culvert going across a road, but I am getting a weird intensity (0.1 in/hr) in the inlet computation sheet when I run the report.  I have the inlet set as a headwall, an 18" RCP, and a standard riprap pad at the outlet.  In the preferences I have the "compute intensity from library rainfall data source" option selected, so it should be reporting 6.5 in/hr, not 0.1 in/hr.  Does anyone know why it is doing this? Thanks!