The border strip
is an area of land flanked by two border ridges, dikes, or ditches. These
ditches guide the irrigation stream from a point or points where the water is
applied to the ends of the strip. The border ditch system uses a ditch as a
divider between individual strips. The ditch carries irrigation water that is
applied at different locations along the entire length of the field. The border
dike system uses dikes on both sides of the strip and the irrigation water is
supplied only at the upper end of the strip.