The establishment of trees on hillsides in semi-arid climates requires a
number of complementary structure such as brushwood barriers, infiltration
ditches, dry wall or bench - terraces and microterraces. They provide a
better utilization of the rainwater which collects and infiltrates along the line
of trees. As a result, the growing rate of the tree's biomass can be
accelerated and a more favorable micro-climate can be created, especially
during the long drought periods.