Map Viewing Service (WMS) of the dataset: Haea zone of the PPRi of the veyre basin (63DDT19980007) approved on 22-12-2008 — Puy-de-Dôme

Hazard maps determine flooded areas in terms of perimeter and flood intensity. Three levels of hazard (low, medium and strong) are defined according to the physical parameters of the flood that can translate in terms of severity for people and damage to property. These parameters are water heights and flow velocities: —high hazard, for water heights exceeding 1 metre, and/or velocities of more than 1 metre per second, —average hazard for heights of water between 0,5 and 1 m and speeds of less than 1 meter per second, or speeds between 0,5 and 1 m per second and heights of less than 1 m, —low hazard for water heights less than 0,5 metres, and speeds of less than 0,5 metres per second. The intensity of the hazards is linked to the mobility of people according to the height of the water and the flow velocities The hazard map is the result of the study of hazards, the objective of which is to assess the intensity of each hazard at any point in the study area. The evaluation method is specific to each hazard type. It leads to the delimitation of a set of areas on the study perimeter constituting a zoning graduated according to the level of the hazard. The allocation of a hazard level at a given point in the territory takes into account the probability of occurrence of the dangerous phenomenon and its degree of intensity. For multi-random PPRNs, each zone is usually identified on the hazard map by a code for each hazard to which it is exposed. All hazard areas shown on the hazard map are included. Areas protected by protective structures must be represented (possibly in a specific way) as they are always considered subject to hazard (case of breakage or inadequacy of the structure). Hazard zones can be described as developed data to the extent that they result from a synthesis using multiple sources of calculated, modelled or observed hazard data. These source data are not concerned by this class of objects but by another standard dealing with the knowledge of hazards. Some areas within the study area are considered “no or insignificant hazard zones”. These are the areas where the hazard has been studied and is nil. These areas are not included in the object class and do not have to be represented as hazard zones. However, in the case of natural RPPs, regulatory zoning may classify certain areas not exposed to hazard as prescribing areas (see definition of the PPR class).