Message 10009

TUFLOW FV

Available since version: 2026.2.0

ERROR 10009 - day_of_the_year requires tform == 1

Description

The solar radiation calculation requires the calendar date to determine the day of the year and solar declination angle. This is only possible when the model uses a date-based time format. The current model is using decimal hours time format (Time Format == HOURS), which does not contain calendar date information.

Suggestions

Change the time format to use calendar dates by setting Time Format == ISODATE in the control file. Update Start Time ==, End Time == and all boundary condition time references to use the dd/mm/yyyy HH:MM:SS format accordingly.