Thoré

Le' Thoré is a river south of the France which runs in the departments of the Herault and of the Tarn. It is an affluent of the Agout out of left bank, therefore a tributary of a tributary of the the Garonne by Agout, then by the Tarn

Geography

It takes its source in the black Montagne in Top Languedoc sprinkles the town of Mazamet and is thrown in the Agout downstream from Castres in the Département of the Tarn

Principal affluents

Hydrology

Length: 61 km
Catchment area: 608 km ²
Medium flow: 16 m ³ /s with its confluence with the Agout.

Thoré is a river abundant but very little regular, following the example its neighbors resulting from the area of the black Montagne and the Cevennes. Its flow was observed during 33 years (1967-1999), with Labruguière, locality of the Département of the Tarn located little before its confluence with the Agout. Surface thus studied is of 550 km ², that is to say 90% of the totality of the catchment area of the river which makes 608 of them.

The interannual medium flow or module of the river with Labruguière is of 15,9 m ³ a second.

Thoré presents seasonal fluctuations of flow extremely marked, like very often in the basin of the Tarn. The high waters are held in winter and are characterized by average monthly flows going from 18,6 to 30,4 m ³ a second, from December to May included (with a maximum enough Net in February). From March however, the flow decreases gradually (18,6 m ³ a second in May), then falls in an important way in June (9,65 m ³) what leads to the low waters of summer which take place from July to September included, involving a fall of the average monthly flow up to 3,13 m ³ in August. But these monthly averages are only averages and hide fluctuations much more marked over short periods or according to the years.

With the low water levels, the VCN3 can fall until 0,940 m ³ a second, in the event of dry period quinquennial, which cannot be described as severe (see note).

As for the risings, they can be very important, taking into account the relative smallness of the catchment area. The QIX 2 and QIX 5 are worth respectively 140 and 210 m ³ a second. The QIX 10 or calculated flow of decennial rising is of 260 m ³ a second, the QIX 20 of 300 m ³, while the QIX 50 is assembled to step less than 360 m ³ a second (see note). Let us note that these values are definitely less low than those which prevail on the Mediterranean slope of the Cevennes (Orb, Herault, Gardon etc) or of the black Montagne (Orbiel for example).

The recorded maximum instantaneous flow with Labruguière was of 544 m ³ a second on December 7th, 1996, while the value maximum day laborer was of 265 m ³ a second on December 17th, 1995. If one compares the first of these values on a QIX scale of the river, one notes that this rising largely higher than raw the cinquantennale was defined by the QIX 50, and undoubtedly much more than centennial, in all the cases very exceptional.

Thoré is a very abundant river. The Lame of water past in its catchment area is of 916 millimetres annually, which is nearly three times superior to the overall average of France, and also largely higher than the average of the basin of the the Garonne (384 millimetres) and of the Agout (565 millimetres). The specific Flow (or Qsp) reached of this fact the very high figure of 28,9 liters a second and per square kilometer of basin.

Departments and crossed cities

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