Generating Quick Flow of only month 11 and 12

Software Support
1

What is the issue or question you have?

got all the values of Quick flow but having 0 values 11 and 12 month only

What do you expect to happen?

having values

What have you tried so far?

Upload the logfile using the :outbox_tray: button

InVEST-seasonal_water_yield-log-2025-06-22–09_33_16.txt (45.5 KB)

2

Hi @abir -

According to the User Guide model section for quickflow, there are several conditions that can cause values to be set to 0:

  • When Si = 0, the Ei term goes to infinity. QFim is set to zero in this case.

  • To avoid issues with numerical instability when the result of exp becomes very large, when (Si/aim > 100), we round QFim down to zero.

  • With certain combinations of inputs, it is possible for the QFim
    equation above to evaluate to a small negative number. In these cases is rounded to zero.

You can look at the equations in the quickflow section of the User Guide and review your inputs, as well as the output file intermediate_outputs/Si.tif to see if anything explains the 0 result. Let us know what you find.

~ Stacie