Hello

I need help in regard with head dependent orifices.

I have head dependent circular orifice (type 21) that closes at a
certain water elevation. This information is described in F4 line that
follows the F1 line describing the orifice.

I did so in the attached extran. The orifice still allow flows when
the upstream water HGL reaches the defined closing head?

When I checked the output, I found that SWMM reads the F4 line, but
when reading the F1 line, it describes the orifice as type 1 not 21?

I tried to change the orifice to type 23 (rectangular orifice) in F1
line, SWMM also reads it type 3? Seems SWMM reads the first digit only
and not the whole number in the NKLASS in F1 line? Not sure why is the
head control not working?

Please advice if you have experience with this problem..
Thank You
Hazem Gheith, Ph.D., PE
HGheith@EMHT.COM