Plagiaulacida
See also: Herault
The Herault (in Occitan Erau/Eraur ) is a coastal Fleuve south of the France 160 km length.
Geography
The Herault takes its source with the Mont Aigoual, in the south of the solid mass of the the Cevennes. He traverses the department Gard then crosses north to the south the department of the Herault to which he gives his name and throws himself in the Mediterranean with Agde.
Principal affluents
Hydrology
Contrary to certain erroneous ideas, the flow of Herault is abundant. With a quantity of more than 1,3 billion tons annually output water and 43,7 m ³ /s, for a basin of only: 2550 km ², Herault post an annually past quantity of 543 liters per square meter, against 240 liters only for the basin of the Oise however considered rainy. The problem of the river is the extreme irregularity of its flow. Sudden risings, often related to precipitations of autumn descending of the solid mass of Aigoual, can exceed: 1500 cubic meters a second. To control these flows a little were built the Barrage of Salagou on the Salagou with Clermont-l' Herault and the Barrage of Olivettes on the Peyne with Vailhan.
Flows from Herault in Agde
The flow of Herault was observed over one 56 years period (1952-2007), with Agde, city of the department of the Herault, located at its mouth in the Mediterranean.
The interannual medium flow or module of the river is of 43,7 m ³ a second.
The Herault present of the seasonal fluctuations of flow rather important, with risings of winter and spring carrying the average monthly flow between 58,5 and 67,4 m ³ a second, from October at March included (maximum in January), and of low waters of summer from June to September, with a fall of the monthly medium flow up to the level of 7,5 m ³ in August.
The VCN3 can fall until 1,5 m ³, in the event of dry quinquennial period (see note). In addition the risings are sometimes extremely violent with important floods. Thus the recorded maximum instantaneous flow was of: 1460 m ³ a second on December 1st, 1958, while the value maximum day laborer was of: 1320 m ³ a second on December 19th, 1997, are almost as much as the medium flow of the Rhone with Valence. The QIX 10 or flow of decennial rising calculated is of: 1400 m ³ a second. As for the QIX 50, it is of: 1900 m ³ (see note), that is to say more than that from the Seine in Alfortville (entered from Paris) which is assembled only to: 1600 m ³ a second. It is to be noticed that the flows records recorded on the Orb in Béziers are a little higher than those from Herault in Agde.
The Lame of water past in the basin of Herault east of 543 millimetres annually, which is high, definitely higher than the overall average of France. The specific flow (or Qsp) is assembled at 17,1 liters a second and per square kilometer of basin.
Departments and crossed cities
-
Department of Gard:
- Sumène (30325)
- Roquedur (30220)
- Saint-Andre-with-Majencoules (30229)
- Saint-Julien-of-the-Nave (30272)
- Valleraugue (30339)
-
Department of Herault:
- Agde (34003)
- Agonic lines (34005)
- Aniane (34010)
- Argelliers (34012)
- Aspiran (34013)
- Bélarga (34029)
- Bessan (34031)
- Brissac (34042)
- Campagnan (34047)
- Canet (34051)
- Castelnau-with-Guers (34056)
- Causse-of-the-Saddle (34060)
- Cazilhac (34067)
- Cazouls-in Herault (34068)
- Florensac (34101)
- Ganges (34111)
- Gignac (34114)
- Lagamas (34125)
- Laroque (34128)
- Lézignan-la-Cèbe (34136)
- Montagnac (34162)
- Our-Lady-with-the-Rouvière (30190)
- Paulhan (34194)
- Pézenas (34199)
- Pouget (34210)
- Pouzols (34215)
- Puéchabon (34221)
- Saint-Andre-with-Sangonis (34239)
- Saint-Bauzille-of-Fitchet (34243)
- Saint-Guilhem-the-Desert (34261)
- Saint-Jean-with-Fos (34267)
- Saint-Martin-of-London (34274)
- Saint-Pargoire (34281)
- Saint-Pons-with-Mauchiens (34285)
- Saint-Thibéry (34289)
- Tressan (34313)
- Usclas-in Herault (34315)
External bonds
- PIKE PERCH
- Herault (decouverte34.com)