Agout
The Agout is a river south of the France. It is important tributary Tarn, therefore a tributary of a tributary of the the Garonne.
Geography
It takes its source very close to the farm known as of the Rec d' Agout in the Regional natural park of High-Languedoc close to the top of Espinouse in the mounts of Espinouse in Top Languedoc department of the Herault and is thrown in the Tarn with Saint-Sulpice Département of the Tarn
Principal affluents
Hydrology
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It is subjected to a pluvio-nival mode the Mediterranean N and ic Océan
- Medium flow: 41 m ³ /s in Lavaur, 55 m ³ /s with its outlet in the Tarn.
Agout is a very abundant river, like all the rivers resulting from the southern part of the French Massif Central. Its flow was observed over one 56 years period (1946-2001), with Lavaur, city of the Département of the Tarn located unfortunately a little far from its confluence with the Tarn and retracting thus in particular water of its affluent the Dadou. The catchment area of the river at this place is of 2 300 km ² (either more or less 66,3% of its totality which makes 3 470 km ²). The following figures thus represent only one (large) left the final flows of the river to its confluence with the Tarn, but are completely representative of the unit, being given the great homogeneity of the basin of the river, on the level of precipitations.
The interannual medium flow or module of the river with Lavaur is of 41 m ³ a second.
Agout present of the seasonal fluctuations of flow very marked, like very often in one the southern third of France, with high waters of winter and spring carrying the average monthly flow on a level located between 56 and 75 m ³ a second, of December with the beginning of May included (with an in February maximum), and low waters of summer, mid-June mid-October, with a fall of the monthly medium flow up to 9,78 m ³ in August. But the average monthly flows are only averages and occult fluctuations much more marked over moreover short periods.
With the low water level, the VCN3 can fall until 2,3 m ³, in the event of period quinquennial dry, which is rather low even severe, but normal compared with the other rivers of the area (see note).
As for the risings, they can be extremely important. Thus the recorded maximum instantaneous flow was of 1 390 m ³ a second on December 8th, 1996, while the value maximum day laborer was of 934 m ³ a second the same day. The QIX 10 or calculated flow of decennial rising is of 780 m ³ a second, the QIX 20 of 930 m ³ and the QIX 50 of 1 100 m ³. The QIX 2 and QIX 5 are worth as for them respectively 400 and 630 m ³ (see note). From where it is concluded that the risings of December 2006, of which it is question higher, were more than cinquantennales, and thus rather exceptional. The QIX 2 of 400 m ³ in Lavaur implies that every two years the discharge of river must statistically reach 400 m ³ a second. As for its QIX 10 of 780 m ³, it means that every 10 years the river will have a rising with this flow.
To have an idea of the importance of these flows, one can compare them with one affluents of the the Seine in the south-east of Paris, the Yonne, famous for his risings which worry the Parisian ones regularly. The QIX 10 of Yonne at the end of the course is worth only 710 m ³ (against 780 for Agout with Lavaur) and its QIX 50 is assembled to 960 m ³ (against 1 100 for Agout). Thus in spite of a basin more than four times less extended and a medium flow of less half, the volume of believed of Agout overrides those of Yonne.
Agout is an abundant river, supplied with such abundant precipitations they, in the areas of the Cevennes, the mounts of Espinouse and Lacaune, as well as Black Mountain in particular. The Lame of water past in its catchment area is of 565 millimetres annually, which is extremely high, largely higher than the overall average of France, and superior also with the average of the totality of the French basin of the the Garonne (384 millimetres with the Farmhouse-with Agenais). The specific Flow of the river (or Qsp) reached the figure of 17,8 liters a second and per square kilometer of basin.
Departments and crossed cities
Remarks
After a passage in the Tarn, then the Garonne, water of Agout will finish their race in the Atlantic Ocean, as well as water of Ariège, the Batch. With 17km in the south-east of the source of Agout, it there with the source of the Jaur (river), whose water will finish, they, their race in the the Mediterranean. There is thus here a " limite" of " divide eaux" , between the Atlantic basin and the Mediterranean basin.
Anecdote: The limit between the basins the Atlantic and Méditerranéen also feels on the level of the Climat; With the mounts and the valleys, the unit gives place to an important diversity of landscapes, agricultural cultures, traditional habitats, picturesque places.