I have three orifices in the model, the first two are just open orifices
and the third is with time history. When reviewing the output file and
monitoring the time closure of the third orifice, I found Extran (I am
using h4.4) assigned the time history to the first gate, not the third
one as I needed. I put the F2 line following the third F1 line (since
the first two F1 lines are for the constant orifice area. that does not
change with time.)

Seems Extran assigns the first F2 line to the first F1 line regardless?
In the input file, I moved the third F1 and its F2 line to be before the
other two F1 lines and the results are now correct!

Did anyone notice the same problem? Is it only in SWMM4.4 version?
Hazem Gheith, Ph.D., PE
HGheith@EMHT.COM