Me and my family have bought a land of 7.5Ha in central Portugal. It has recently burned down with the big wildfires, and almost no vegetation is left and thus a lot of erosion will happen if we don't do something soon. Some part are gradual slopes an other are steeper, the thing is that in the past they made ''terraces'' to plant industrial eucalyptus all over the land, but these terraces are almost all off contour with no retention walls. Our soil is granite based and sandy, so it is not very stable and erodes easy. As it is so big it is not very viable to build retention walls all over the place, neither to bring back natural shape of the land. So my question is if we build swales on these terraces, would that be enough to stabilize the walls? Are there any other ways to approach this situation? Most of this land will be used for forests or other native plant species.
I've uploaded a pair of pictures to give an idea of how the terraces are. (they go from 0.5m to 3m high)
I await any response with much hope!
Thomas vd laak.