For natural PPRs, the code of l'environment defines two categories of zones (L562-1): risk-exposed areas and areas that are not directly exposed to risks but on which measures can be foreseen to avoid d’#x27; aggravate the risk.Depending on the level of #x27; hazard, each zone is the subject of an opposable settlement.
Regulations generally distinguish three types of zones:
1- ‘zones d' prohibition to build’, known as ‘red zones’, where the level of #x27; hazard is strong and the general rule is #x27; prohibition on building;
2- ‘zones subject to requirements’, known as ‘blue zones’, where the level of hazard is average and projects are subject to requirements adapted to the type of #x27; stakes;
3- areas not directly exposed to risks but where constructions, structures, development or agricultural, forestry, artisanal, commercial or industrial operations could aggravate or cause new risks, subject to prohibitions or requirements (cf. Article L562-1 of the Code of the Environment). The latter category is only applicable to natural PPRs.
__Origin__
The boundaries of a zone d’#x27;aira are represented on the map of hazards according to the level of l'random. In other words, polygon objects representing zones d'random form a partial coverage of the studied area of which each cover element is a closed polygon in which hazards have the same level of ' intensity. In other words, the criterion for cutting the zones d'random is the level of l'random.
__Partner organisations__
DDT Loir-et-Cher
__Links annexes__
* [XML metadata view](http://ogc.geo-ide.developpement-durable.gouv.fr/csw/all-dataset?REQUEST=GetRecordById&SERVICE=CSW&VERSION=2.0.2&RESULTTYPE=results&elementSetName=full&TYPENAMES=gmd:MD_Metadata&OUTPUTSCHEMA=http://www.isotc211.org/2005/gmd&ID=fr-120066022-jdd-83249dc4-3131-43af-b8d7-1389ffb24e41)
* [COVADIS data standard: Risk Prevention Plan PPRN PPRT](http://geostandards.developpement-durable.gouv.fr/afficherPageStandard.do?id=15)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/92e7a73ed156361cbb2cbc1735181319cfc6fbbd)
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