Abstract
In Alpes Maritimes, near Nice, the falls of lump threaten frequently many roads. Studied along a section of the Vesubie Valley, the fallen amounts are connected to two sorts of explanation : the variables of the climate (rain, frost) and the variables of the topography and geological structure (height of the bank, slope of geological layers, fissures ...). The part of the seasons, varying according to the spots, is shown up