Comparing equations 18 and 16 shows that a stationary
point on the Ea(qo) function represents a maximum for 2 <
−1. In order to determine the domain of 2, simulation
experiments were performed using five data sets that cover
a wide range of irrigation conditions using SRFR (Strelkoff
et al., 1998). The combinations of border length and the
parameter set (i.e., bed slope, surface roughness, and
infiltration) used were selected such that a broad range of
irrigation conditions was taken into account (table 1)