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A major flood · 2023

Pas-de-Calais floods (November 2023 and January 2024)

From late October 2023 to February 2024, the water rose in two waves in the Pas-de-Calais and the neighbouring départements. At Isques, the Liane reached the highest peak flow in the station's 14 years of measurements. The flood zone observed by State services in November 2023 covers 4,590 hectares of protected or inventoried areas, ZNIEFF included (a ZNIEFF is an inventory, with no regulatory protection), and 100 hectares in Natura 2000 or under regulatory protection. The water covered 7.4 of the 7.6 hectares protected by the biotope protection order of the marais Saint-Aldegonde. 152 protected animal species had been recorded in this flood zone over the previous ten years, among them the Atlantic salmon, protected on its spawning grounds, and, in the zone or nearby, the adder, vulnerable on the national Red List.

Pas-de-CalaisNordSomme
In blue, the communes declared for this flood: this blue is not the water. In white, the flooded area mapped by State services in November 2023. In coral, the Natura 2000 sites and those under regulatory protection, in bright coral their part within that area. Hover over a département to read its name. Map: Animalert, from GASPAR (Géorisques), the observed flood zones (DDTM) and IGN ADMIN EXPRESS

  • 5,922 hectares of flooded area mapped by State services

    in November 2023

  • 100 hectares in Natura 2000 or under regulatory protection

    2% of the observed flooded area

  • 152 protected animal species recorded within reach in the ten years before the flood

  • 7 animal species threatened on the national Red List, protected or not

    birds: by their population in the flood's season
Communes declared
390
Dates per the orders
26 October 2023 to 14 February 2024
Départements
Pas-de-Calais, Nord and Somme
Flood type
river flooding, runoff or mudflow, rising groundwater
Heaviest rainfall
63.1 mm
in one day (Pas-de-Calais, 2 November 2023), BAINGHEN station · per Météo-France
  1. 28 October 2023: 19.2 mm
  2. 29 October 2023: 13.9 mm
  3. 30 October 2023: 7 mm
  4. 31 October 2023: 17.9 mm
  5. 1 November 2023: 8.8 mm
  6. 2 November 2023: 63.1 mm
  7. 3 November 2023: 9.2 mm
  8. 4 November 2023: 26 mm
  9. 5 November 2023: 20.9 mm

89.8 mm from 31 Oct to 2 Nov, up to the wettest day

The flood's dates

Peak discharge
125 m³/s
La Liane à Isques, on 10 November 2023 · per Hub'Eau
Extent
flooded area mapped by State services in November 2023
5,922 ha

Protected species recorded within reach

Observations recorded in the ten years before the flood, some known only to within a few kilometres, up to 10 km, when their published position is blurred or given by grid square. They tell which species were reported there, not what became of each animal.

  • 1,402 species recorded within reach

  • 152 protected animal species among them and 5 protected plants

  • 7 animal species threatened on the national Red List, protected or not (vulnerable, endangered or critically endangered)

  • 124 Birds

  • 10 Mammals, bats included

  • 6 Fish, molluscs and crayfish

  • 6 Reptiles

  • 6 Amphibians

For birds, the category is the one of their population at the flood's season (breeding, wintering or passage birds): a bird with no dated record within reach in that season in the GBIF data has none, and the breeding category needs at least two dated records in June or July. In the migration season (March, August to October), a bird that neither the passage list nor the wintering list assesses takes its breeding category only if it was recorded at least twice within reach in June or July. The list used is named under each species.

The most notable protected animal species

Species with at least three observations (for a bird, three in the months that give it its category, and no bird without a record at the flood's season), the most threatened first, then the most recorded. An observation is a published record: it can count one or several animals, and the same animal can be noted several times. When their published position is imprecise, blurred or given by grid square, they are said to be "within reach or nearby".

Mammals, bats included

Reptiles

Fish, molluscs and crayfish

For fish, national protection (order of 8 December 1988) covers their eggs and spawning grounds: several are fished legally.

Birds

The observations cover every season: a migrant bird recorded there may have been away on the day of the flood.

Amphibians

  • Triton ponctuéSmooth Newt

    Lissotriton vulgarisRed List: near threatened
    15 observations

Photos: Wikimedia Commons, each under its own licence (CC BY, CC BY-SA, CC0, public domain). Credit for each photo

In the water's path

Establishments registered today within reach of the flood, at their declared address or at the point Géorisques gives. They were not necessarily there on the day of the flood, and the dataset does not say whether they were flooded. An ICPE-classified farm can also be in the SIRENE register: these counts do not add up.

  • 3 ICPE-classified livestock farms located within the flood's reach

    Géorisques · ICPE

  • 30 livestock businesses in the SIRENE register based within the flood's reach

    SIRENE register · Insee

  • 4 veterinary practices based within the flood's reach

    SIRENE register · Insee

  • 4 animal protection associations based within the flood's reach

    National register of associations

  • 1 wildlife association based within the flood's reach

    National register of associations

Of the 30 livestock businesses in the SIRENE register: 11 cattle, sheep, goat or pig farms, 7 horse farms and 12 farms of other animals.

A wildlife association is an association whose declared purpose in the national register of associations is the preservation of wildlife: the register does not say whether it runs an authorised care centre.

Protected areas within reach

Area of each site within reach of the flood, and the share of the site it represents. Natura 2000 and regulatory protection first, then the ZNIEFF.

A marsh can be designated twice under Natura 2000, for its birds and for its habitats: the areas overlap and do not add up. A ZNIEFF is a wildlife inventory, with no regulatory protection.

The declared communes

390 communes declared a natural disaster (flood) for this flood, département by département.

Pas-de-CalaisSee the 316 communes

Acquin-Westbécourt, Affringues, Aire-sur-la-Lys, Aix-en-Ergny, Aix-en-Issart, Alembon, Alette, Alincthun, Alquines, Ames, Andres, Ardres, Arques, Attin, Auchy-lès-Hesdin, Audembert, Audinghen, Audrehem, Audresselles, Audruicq, Autingues, Avesnes, Avroult, Baincthun, Bainghen, Balinghem, Bayenghem-lès-Éperlecques, Bayenghem-lès-Seninghem, Bazinghen, Beaumerie-Saint-Martin, Beaurainville, Bécourt, Belle-et-Houllefort, Bellebrune, Bellinghem, Berck, Bergueneuse, Bernieulles, Béthune, Beussent, Bezinghem, Bimont, Blangy-sur-Ternoise, Blendecques, Bléquin, Boisdinghem, Bomy, Bonningues-lès-Ardres, Boubers-lès-Hesmond, Bouin-Plumoison, Boulogne-sur-Mer, Bournonville, Boursin, Bourthes, Brêmes, Bréxent-Énocq, Brimeux, Brunembert, Calais, Calonne-Ricouart, Calonne-sur-la-Lys, Camiers, Campagne-lès-Boulonnais, Campagne-lès-Guines, Campagne-lès-Wardrecques, Carly, Cavron-Saint-Martin, Clairmarais, Clerques, Colembert, Colline-Beaumont, Conchil-le-Temple, Condette, Contes, Conteville-lès-Boulogne, Coquelles, Cormont, Coulogne, Coulomby, Coupelle-Vieille, Courset, Coyecques, Crémarest, Crépy, Créquy, Cucq, Dannes, Delettes, Dennebrœucq, Desvres, Doudeauville, Echinghen, Ecquedecques, Ecques, Écuires, Elnes, Embry, Enquin-lez-Guinegatte, Enquin-sur-Baillons, Éperlecques, Ergny, Erny-Saint-Julien, Escalles, Escœuilles, Esquerdes, Estrée, Estrée-Blanche, Estréelles, Étaples, Fauquembergues, Ferques, Fiennes, Fléchin, Floringhem, Frencq, Fresnicourt-le-Dolmen, Fressin, Fréthun, Fruges, Gonnehem, Grigny, Guemps, Guînes, Guisy, Halinghen, Hallines, Hames-Boucres, Hardinghen, Haut-Loquin, Henneveux, Herbinghen, Herly, Hervelinghen, Hesdigneul-lès-Boulogne, Hesdin-l'Abbé, Heuringhem, Hézecques, Houlle, Hubersent, Hucqueliers, Humbert, Inxent, Isbergues, Isques, Journy, La Calotterie, La Capelle-lès-Boulogne, La Couture, La Madelaine-sous-Montreuil, Lacres, Lambres-lez-Aire, Lapugnoy, Le Portel, Le Touquet-Paris-Plage, Le Wast, Lebiez, Ledinghem, Lefaux, Les Attaques, Lespinoy, Lestrem, Leubringhen, Leulinghem, Licques, Lillers, Lisbourg, Loison-sur-Créquoise, Longfossé, Longuenesse, Longueville, Longvilliers, Lottinghen, Louches, Lugy, Lumbres, Maintenay, Mametz, Maninghen-Henne, Marant, Marck, Marconnelle, Marenla, Maresquel-Ecquemicourt, Maresville, Marles-sur-Canche, Marquise, Matringhem, Mazinghem, Mencas, Menneville, Mentque-Nortbécourt, Merck-Saint-Liévin, Merlimont, Monchy-Cayeux, Montcavrel, Montreuil-sur-Mer, Moringhem, Moulle, Mouriez, Muncq-Nieurlet, Nabringhen, Nempont-Saint-Firmin, Nesles, Neufchâtel-Hardelot, Neulette, Neuville-sous-Montreuil, Nielles-lès-Ardres, Nielles-lès-Bléquin, Nielles-lès-Calais, Nordausques, Nort-Leulinghem, Nortkerque, Nouvelle-Église, Offekerque, Offin, Offrethun, Outreau, Ouve-Wirquin, Oye-Plage, Parenty, Pernes-lès-Boulogne, Pihen-lès-Guînes, Pittefaux, Polincove, Preures, Quelmes, Quernes, Quesques, Questrecques, Quiestède, Quilen, Racquinghem, Radinghem, Rang-du-Fliers, Rebergues, Reclinghem, Recques-sur-Course, Recques-sur-Hem, Remilly-Wirquin, Renty, Rety, Richebourg, Rimboval, Rinxent, Robecq, Rodelinghem, Roquetoire, Royon, Rumilly, Ruminghem, Sailly-sur-la-Lys, Saint-Aubin, Saint-Augustin, Saint-Denœux, Saint-Étienne-au-Mont, Saint-Floris, Saint-Folquin, Saint-Josse, Saint-Léonard, Saint-Martin-Boulogne, Saint-Martin-Choquel, Saint-Martin-d'Hardinghem, Saint-Martin-lez-Tatinghem, Saint-Michel-sur-Ternoise, Saint-Omer, Saint-Omer-Capelle, Saint-Tricat, Saint-Venant, Sainte-Marie-Kerque, Salperwick, Samer, Sanghen, Selles, Sempy, Seninghem, Senlecques, Senlis, Serques, Setques, Surques, Tardinghen, Thérouanne, Thiembronne, Tilques, Tingry, Torcy, Tournehem-sur-la-Hem, Troisvaux, Tubersent, Vaudringhem, Verchin, Verchocq, Verlincthun, Vieil-Moutier, Vieille-Église, Vincly, Waben, Wacquinghen, Wambercourt, Wavrans-sur-l'Aa, Wicquinghem, Widehem, Wierre-au-Bois, Wimereux, Wimille, Wirwignes, Wismes, Wisques, Wissant, Witternesse, Wittes, Wizernes, Zoteux, Zouafques, Zudausques, Zutkerque

NordSee the 60 communes

Armbouts-Cappel, Arnèke, Bailleul, Bavinchove, Boeschepe, Bollezeele, Bourbourg, Brouckerque, Broxeele, Cappelle-la-Grande, Cassel, Eringhem, Esquelbecq, Estaires, Gravelines, Haverskerque, Hazebrouck, Herzeele, Holque, Houtkerque, Hoymille, Killem, La Gorgue, Le Doulieu, Lederzeele, Leffrinckoucke, Looberghe, Merckeghem, Merville, Millam, Neuf-Berquin, Nieurlet, Noordpeene, Ochtezeele, Oost-Cappel, Oudezeele, Oxelaëre, Pitgam, Quaëdypre, Rexpoëde, Rubrouck, Saint-Momelin, Saint-Pierre-Brouck, Spycker, Steenbecque, Steenvoorde, Steenwerck, Terdeghem, Thiennes, Vieux-Berquin, Volckerinckhove, Wallon-Cappel, Warhem, Watten, Winnezeele, Wormhout, Wylder, Zegerscappel, Zermezeele, Zuytpeene

SommeSee the 14 communes

Argoules, Bourseville, Favières, Fort-Mahon-Plage, Le Crotoy, Nampont, Nibas, Noyelles-sur-Mer, Ponthoile, Quend, Rue, Saint-Quentin-en-Tourmont, Villers-sur-Authie, Vron

Download this flood's data

In every file of the dataset, this flood carries the identifier EV-20231102-20231112-62. Its dates were frozen when the identifier was created and differ here from the flood's.

Download the datasetdata.gouv.fr

Recognised and listed