The results summarized in figure 1 show that in all the cases considered, regardless of the inflow cutoff option used, cutoff time remains
a monotonic increasing power function of border length:
2 > 1 (table 2). It then follows that the right side of equation 7 is less than zero at a stationary point. Hence, a stationary point on Ea(L) represents a maximum point. The absence
of a local minimum automatically precludes the existence of
multiple local maxima. Therefore, the stationary point on the
Ea(L) function is a global maximum, and the Ea(L) function
is unimodal