Regulatory zoning of the risk prevention plan for landslides of the Côte d’Île-de-France sector Vallée de la Marne Tranche 3

The objective of the regulatory zoning phase is to define homogeneous areas in terms of prohibitions, prescriptions, recommendations or land use, both for new projects and for existing assets. The principles of this zoning are based in particular on a confrontation between the different levels of hazards previously identified and the assessment of existing and future issues characterising the surface. The identification of these homogeneous areas results in the development of a mapping of the regulatory zoning of the PPRN GT... Directly related to this zoning, a regulation must be established. Its purpose is to set out, in a clear and operational manner, the regulatory measures that apply to each of the Regulatory Areas. The scale of use of the regulatory zoning is that of 1/10 000 and exploitation on a smaller cadastral scale (1/5000 or 1/2000) is not recommended. The accuracy of the initial data therefore presents uncertainty about its contours in the order of 10 metres. Genealogy: The boundaries of a restricted area are shown on the graphical documents of the RPP. Regulatory limits are generally set on natural phenomena, which do not follow cadastral or administrative boundaries. A PPR determines the boundaries of the different restricted areas based on the calculated right-of-way of the site’s hazardous phenomena. Some PPRs may sometimes contain regulations associated with linear or point configurations (cavitates, runoff axis...). The linear and point graphic primitives are to be used in these cases respectively.