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Flood warning

Updated on 06/09/2018
Définition
Sens commun
Warning issued in advance by the departmental flood forecasting services. In the event of heavy rainfall or hydrological alert, a flood warning is sent to the Prefect, who then alerts the mayors of the catchment areas concerned.
Source
according to AFB

Retention basin

Updated on 06/09/2018
Définition
Sens technique
A storm management basin for the temporary storage of runoff water to protect homes and structures during periods of heavy rain.
Source
according to the Intermunicipal Sanitation Syndicate of the Enghien-les-Bains region

Flood travel

Updated on 06/09/2018
Définition
Sens commun
Travel of rising water levels from upstream to downstream of a watercourse.
Source
according to IRSTEA

Natural risk

Updated on 06/09/2018
Définition
Sens technique
Threat of a dangerous event caused by a natural phenomenon, called hazard, having damaging, unforeseen or badly prevented effects on developments, structures and people, the stakes being more or less serious, even catastrophic, according to their vulnerability. A natural risk is the confrontation between a hazard of natural origin and human, economic or environmental stakes.
Source
according to the Regional Directorate for the Environment, Planning and Housing (DREAL) of the-Loire region

Breaking of a dike

Updated on 06/09/2018
Définition
Sens commun
Partial or total destruction of a dike. The causes of failure can be technical (defects in design, construction or materials, ageing of the structure), natural (following earthquakes, exceptional floods, a storm, a marine submersion, landslides, weakening by the burrows of animals) or human (not enough preliminary studies and project control, error of use, lack of monitoring and maintenance, malicious mischief).
Source
according to the Departmental Land Directorate (DDT) of Côtes-d'Armor

Hazard-prone area

Updated on 06/09/2018
Définition
Sens commun
Area exposed or that could be exposed to hazards or potentially dangerous events (flood, pollution, natural disaster, industrial accident) and where human, economic or environmental issues are involved.
Source
according to the Ministry of the Environment

Atlas of floodplains

Updated on 13/07/2018
Définition
Sens commun
Mapping of the surface area that would be flooded by high water levels modelled for each frequency (10-year to 100-year floods) or determination by a hydro-geomorphologic method of homogeneous spatial units modelled for different types of floods. The Atlas of floodplains thus represent potential flood-prone areas having (or not) been flooded by a known high water level.
Source
According to Rhine-Meuse Water Agency

Atlas of flooded areas

Updated on 04/07/2018
Définition
Sens commun
Mapping of the surface area flooded by a significant high water level that allows keeping record of the largest floods.
Source
According to Rhine-Meuse Water Agency

Flood control

Updated on 13/07/2018
Définition
Sens technique
Action of limiting a peak flow, either by storage in a specific reservoir, or by expanding the flood plain.
Source
According to Rhine-Meuse Water Agency

Flood

Updated on 13/07/2018
Définition
Sens commun
Fast or slow submersion of facilities or homes due to groundwater or surface water overflowing during flood or runoff caused by rainfall.
Source
According to Rhine-Meuse Water Agency

Flood marker

Updated on 13/07/2018
Définition
Sens commun
A mark showing the historical floods of a river. Witness to the great past floods, flood markers allow to keep the memory of floods that time or trauma can sometimes erase. They come in different shapes (line or mark on stone, metal plate or sealed flat button, etc) and are found on different types of buildings (public or private buildings, wharves, piers of bridge, etc).
Source
According to Rhine-Meuse Water Agency

Flood forecasting service

Updated on 13/07/2018
Définition
Sens technique
Service in charge of predicting hazardous situations caused by heavy floods, in partnership with Météo-France. The flood forecasting Service (SPC) warns the Prefect in case of alarm and prepares the information to be disseminated to the mayors. The Civil Protection Service of the prefecture is in turn responsible for alerting the mayors by suitable means and providing them with the information developed by the
Source
According to Rhine-Meuse Water Agency

Area for flood storage purpose

Updated on 13/07/2018
Définition
Sens technique

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.

Source
According to Rhine-Meuse Water Agency

Hazard

Updated on 19/06/2018
Définition
Sens commun
Nature, occurrence, intensity and duration of a threatening phenomenon.
Source
According to SOeS

Flood-prone areas plan

Updated on 13/07/2018
Définition
Sens technique
Document that establishes a public easement affecting land use. It allows the administration to oppose any action or work likely to impede the free flow of water or the conservation or floodplains.
Source
According to the Ministry for the Environment

Vulnerability

Updated on 13/07/2018
Définition
Sens technique
Fragility and susceptibility when facing a given hazard or a given pressure.
Source
According to SOeS

Risk Exposure Plan

Updated on 13/07/2018
Définition
Sens technique
Plan for delimiting, at municipal or inter-municipal level, areas exposed to predictable natural hazards such as earthquakes, floods, avalanches or ground movements. The Risk Exposure Plan (REP) sets out the appropriate measures to prevent
Source
According to the Ministry for the Environment and AFB

Flood forecasting

Updated on 13/07/2018
Définition
Sens technique
Analysis aiming to determine the expected flood characteristics: flow, level, time of onset and duration of these floods at different sites in the drainage basin. Modelling is used for this purpose. The forecasts are based on series of statistical analyses of historical floods and on the knowledge of flood storage areas.
Source
According to the Ministry for the Environment and AFB

Precautionary principle

Updated on 13/07/2018
Définition
Sens technique
Usually refers to caution in action. More specifically it is a constitutional principle, included in the Environmental Charter (Article 5): "When the occurrence of any damage, although uncertain in current scientific knowledge, may be so serious and irreversible for the environment, public authorities shall, by application of the precautionary principle and in their areas of responsibilities, develop procedures for risk assessment and take provisional and proportionate measures to preclude the occurrence of the damage".
Source
According to the Ministry for the Environment and AFB

Risk related to flood-prone areas

Updated on 19/06/2018
Définition
Sens technique
Injury to life, health or damage that may occur in floodplains. In those, we can distinguish several levels of risk depending on the severity of damage to be feared, taking into account the flooding height, flow velocity (for the flooding considered) and the vulnerability of exposed sites.
Source
According to the Ministry for the Environment and AFB

Health risk

Updated on 13/07/2018
Définition
Sens technique
More or less likely danger or inconvenience (immediate or long-term) to which public health is exposed. The identification and analysis of risks related to a phenomenon (flooding, contamination, etc) usually allows predicting its impact on public…
Source
According to the Ministry for the Environment and AFB

Flood-storage area

Updated on 13/07/2018
Définition
Sens commun
Area where overflows can spread in the floodplain and which plays a significant role in flood control. Mapping these flood-storage areas allows better land use management in the valleys.
Source
According to the Ministry for the Environment and AFB