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Concept
Liane (river)
Summary
The Liane is a 38 km long river in the Pas-de-Calais department in northern France. It rises in Quesques and flows into the English Channel at Boulogne-sur-Mer. Other communes along its length include: Selles, Brunembert, Bournonville, Alincthun, Crémarest, Wirwignes, Questrecques, Samer, Carly, Hesdigneul-lès-Boulogne, Isques, Saint-Léonard, Hesdin-l'Abbé, Condette, Saint-Étienne-au-Mont, and Outreau.
The Liane flows for a length of 38.2 km. It rises at Quesques, then flows through the communes of Bournonville, Wirwignes, Questrecques, Carly, Hesdigneul, Isques and Saint-Léonard. It finally flows into the English channel at Boulogne-sur-Mer. Before being fitted with canals and locks, the Liane estuary contributed directly to the fleuve marin côtier which abuts the Picardy estuaries up to the location of the two capes. It has been proposed in one variation of the project that its estuary, although significantly transformed by technology, should be part of a putative natural park, the Parc naturel marin à l'ouvert des estuaires picards et en mer d'Opale, a proposal in preparation since 2008 and submitted to public enquiry in 2011.
The average gradient of the Liane is 2.8 ‰. Its tributaries include the following:
The Liane is a very fast flowing river, but quite irregular. Its flow rate has been measured over a 27-year period (1965–1991), at Hesdigneul-lès-Boulogne near Boulogne-sur-Mer, a short way from its mouth. The watershed of the river at that point is 196 km2, or approximately 80% of its maximum value of 244 km2).
The mean interannual flow rate or discharge of the Liane at Hesdigneul-lès-Boulogne is 2.99 m3/s.
Just like its neighbour, the Wimereux, but unlike most Pas-de-Calais waterways, the Liane exhibits highly marked seasonal fluctuations. High waters occur at the end of autumn and in winter, characterised by monthly mean flow rates between 3.06 and 5.33 m3/s, from November to March inclusive with a maximum in January. Low waters occur in summer, from June to September, with a decrease in monthly mean flow rate descending to 0.
Official source
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