Area for flood storage purpose

Natural or agricultural floodplain (not currently urbanized), that can be extended to floods whose occurrence is higher than the hundred-year flood, as part of a hydrogeomorphical approach. When local stakes require it (level of hazards, areas considered important, etc), floodplains, which, at the date of approval of the river basin management plan (SDAGE), are classified "to be urbanized" but are not yet highly urbanized, may be considered, for their part not yet urbanized, as areas for flood storage purpose.