Determine qmin and check if the corresponding
maximum possible advance distance (Lmax) is less
than or greater than Lf.
Calculate qmin as a function of Lf using equation
24.
Using a simulation model (e.g., SRFR), check
if the irrigation stream can advance to the
downstream end of the border (for L = Lf and
qo = qmin). If the advance phase is completed,
then Lmax > Lf. If, on the other hand, the stream
failed to reach the downstream end of the
border, then Lmax < Lf, and Lmax needs to be
determined through repeated runs of a simulation model