For property other than land motor vehicles, in a commune that does not have a plan for the prevention of foreseeable natural risks for the risk that is the subject of an order declaring a state of natural disaster, the excess is adjusted, for property insured by local authorities or their groupings, according to the number of declarations of a state of natural disaster that have been made for the same risk over the five years preceding the date of the new declaration, as follows:
1° First and second determination: application of the deductible;
2° Third determination: doubling of the applicable deductible;
3° Fourth determination: tripling of the applicable deductible;
4° Fifth and subsequent determinations: quadrupling of the applicable deductible.
The provisions of the previous paragraph cease to apply from the time that a plan for the prevention of foreseeable natural risks is prescribed for the risk that is the subject of the declaration of a state of natural disaster in the municipality concerned. They resume their effects if the aforementioned plan is not approved within four years of the date of the order prescribing the natural risk prevention plan.