Incision of the valleys parallel to the erosion of the ponds. Some of them extended by non retarded superficial water. 3 80ies to 90ies. Generalized and extended degradation of the slopes and beginning of restauration programs with the background of simple techniques adapted to the local possibilities. General woodcutting and overgrasing, no field rotation.
Plant cover very rare.
Regressive erosion by runnels climbing up the slopes. Accelerated erosion of the interfluves. Enforced runoff by open and incrusted surfaces which becomes torrential in the valleys. These techniques show to be insufficiant and ineffectiv to stop the dominant regressive erosion. 4 Scheme of optimal intervention.