The documentary describes cultures the origin of forestry culture and the institutions working in the field of hydrogeological protection. In particular it deals with the causes of serious degradation nd methods of serious degradation and methods of intervention. Man has not learnt much from past natural disasters, and even recent ines; He continues to build in areas ‘ at risk’ and this is why hydraulic - forestation works, about which the general public knows very little, are so important for protection against hydrogeological hazards;