Lez (affluent of salat) — Wikipedia
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For homonymous articles, see Lez.
Should not be confused with the Lèze, another river of the Ariège
The Quick is a river in the southwest of France which flows in the department of Ariège, in the Couserans region. It is an tributary of the salat on the left bank, so a sub-pest of the Garonne.
Lez has its source in the Pyrenees at the Pic de Maubermé (2,880 meters above sea level), located on the Spanish border, in the Ariège department. Its upper course takes place in the Biros valley. Its general orientation goes from the southwest to the northeast. He bathes Castillon-en-Couserans. After a 35.8 km long course [ first ] , inflated by many abundant small tributaries, he throws himself into the salat on the left bank, in Saint-Girons.
Departments and municipalities crossed [ modifier | Modifier and code ]
- Ariège: Sentein, Bonac-Irazein, Bordes-Uchentein, Castillon-en-Couserans, Audésein, Arrout, Cescau, Balaguères, Engommé, Moulis, Saint-Girons.
- Isard: 8.8 km
- The edge: 11.1 km
- Le Riberot: 13,8 km
- Struck stream: 7.2 km
- And Balamet: 9 km
- La Bouigane: 24,2 km
- Astien stream: 5.3 km
- Soupteau: 5.3 km and its tributary the Rémillassé stream: 7.2 km
Lez in Saint-Girons [ modifier | Modifier and code ]
The Lez debit was observed during a period of 20 years (1911-1930), in Saint-Girons, city of the Ariège department located at the level of its confluence with the Salat [ 2 ] . The surface studied is 417 km 2 , that is to say the entire river watershed.
The river module in Saint-Girons is 13.2 m 3 /s.
Lez presents seasonal fluctuations of well marked flow, as generally in a mountainous environment. Its diet is mainly nival, with a slight rain component.
The high waters are characterized by a double peak, the first, very light, in November corresponding to the fall rains with an average monthly flow of 11.7 m 3 /s. From December to February, there is a slight drop in flow (11.0 m 3 /s), a larger share of precipitation being retained in the mountains, in the form of snow. The second summit takes place in the spring, from March to June included (with a very clear maximum in May) and corresponds above all to the melting of the snow. It is characterized by average monthly flows ranging from 15.4 m 3 /s (in March) at 26.5 m 3 /s (in never) et 20,4 m 3 /s (June). From June, the speed drops quickly, to the low water (low water) at the end of summer-fall of autumn which take place from August to October, accompanied by a drop in the average monthly flow until At the floor of 6.64 m 3 /s in September, which remains very consistent it is true. But these monthly averages are only averages and obscure more pronounced fluctuations over shorter periods or depending on the year.
Stalling or low waters [ modifier | Modifier and code ]
In low water, the VCN3 can drop up to 2.1 m 3 /s [ 2 ] , which cannot be described as severe.
Flood [ modifier | Modifier and code ]
Floods can be significant, as is the rule in mountainous territory. The Qix series was not calculated, but the QJX series was well. QJX 2 and QJX 5 are 69 and 88 respectively m 3 /s. QJX 10 is 100 m 3 /s, QJX 20 of 110 m 3 /s and the QJX 50 was not calculated for lack of sufficient observation time [ 2 ] .
The maximum daily flow recorded in Saint-Girons was 141 m 3 /s [ 2 ] . If we compare this value on the QJX scale of the river, we see that this flood was much higher than the volume of the vicennal flood defined by the QJX 20, and therefore very exceptional.
Water blade and specific flow [ modifier | Modifier and code ]
Lez is a very abundant river. The water blade elapsed in its watershed is 1,003 millimeters annually, which is three times higher than the overall average of France, all basins combined, but corresponds to the values observed among the other pyrenean watercourses of The region, generally very abundant. The specific flow (or QSP) therefore reaches the very consistent figure of 31.8 liters per second and per square kilometer of the basin [ 2 ] .
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