Cereals, mainly wheat and barley, covered a little over one-third of the irrigated area (Figure 7). </p> <a name=Drainage_development id=Drainage_development></a><h3> <span class=mw-headline>Drainage development</span></h3> <p>The total drained area increased from 6,900 hectares (ha) in 1975 to 60,400 ha in 1994, with a major increase from 1989 onwards (Figure 8).