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L'Aa topographic map
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L'Aa
Le bassin versant de l'Aa correspond dans sa partie amont à une des zones les plus pluvieuses de la région Hauts-de-France. La Haute Aa est alimentée par la nappe de la craie, bénéficiant d'un régime naturel sur une pente assez forte, entaillant parfois la craie et même le socle primaire. La Haute Aa passe ainsi en 40 kilomètres d'une altitude de 122 mètres à Bourthes à 11 mètres à Arques (pente moyenne de 2,22 pour mille). À Lumbres, le Bléquin joint ses eaux à l'Aa qui forme un coude à angle droit vers l'est, puis part brusquement vers le nord à Arques, à cause de la tectonique des blocs. À Blendecques, l'Aa se sépare entre Haute Meldyck et Basse Meldyck, premières tentatives de canalisation du cours du fleuve au X siècle. À Arques, la Haute Meldyck suit le canal de Neufossé, tandis que la Basse Meldyck rejoint la déviation de Saint-Omer du canal de Neufossé.
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About this map
Name: L'Aa topographic map, elevation, terrain.
Average elevation: 105 m
Minimum elevation: -2 m
Maximum elevation: 215 m
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