Agron

Geography

Of a length of 24,4 km, it takes its source in Argonne, with Tailly, ten kilometers in the east of Buzancy, in the department of the the Ardennes. The river moves initially towards the oblique west then towards the south and joins the Surface on the level of the locality of Saint-Juvin.

Its catchment area has a surface of 150 km ².

Common crossings

Agron crosses the of the Ardennes communes of Tailly, Bayonville, Imécourt, Verpel, Champigneulle and Saint-Juvin.

Hydrology

Agron is a rather abundant river. Its flow was observed during 15 years (between 1970-1999), with Verpel, very close to its confluence with the Surface. The catchment area of the river is there of 133 km ², i.e. more or less 90% of its totality.

The interannual medium flow or module of the river with Verpel is of 1,79 m ³ a second.

Agron present of the seasonal fluctuations of flow rather important, with high waters of winter carrying the average monthly flow on a level located between 2,72 and 3,12 m ³ a second, from December to March included (with an in January maximum), and low waters of summer, from June to October included, with a fall of the monthly medium flow going up to 0,415 m ³ in September and August especially. However the fluctuations can be more marked over moreover short periods, and the levels fluctuate according to the years.

The VCN3 can fall until 0,12 m ³, in the event of dry period quinquennial, which is relatively severe. The VCN3 is the past minimal quantity or minimal flow over three days consecutive.

The risings can be important enough for this small river with reduced basin. The QIX 2 or calculated flow of biennial rising and QIX 5 (calculated flow of quinquennial rising) are worth respectively 14 and 18 m ³. The QIX 10 or calculated flow of decennial rising is of 20 m ³ a second and the QIX 20 of 23 m ³. As for the QIX 50 or computed value of the flow of raw cinquantennale, it was not calculated, for lack of duration of sufficient observation (see note). That means that, for example, every two years, one must expect a rising of about 14 cubic meters, and every twenty years a rising of 23 cubic meters must statistically occur.

The recorded maximum instantaneous flow was of 24,2 m ³ a second on December 31st, 1981, while the maximum daily output was of 17,6 at the same date. By comparing the value of the maximum instantaneous flow on a QIX scale of the river, it appears that this rising was of order vicennial, and thus relatively frequent and intended to reproduce regularly, more or less every 20 years.

On the whole, Agron is a small, but abundant river. The Lame of water past in its catchment area is of 426 millimetres annually (against 431 for the Surface), which is rather high, being worth definitely more than the average overall of France all confused basins, but especially higher than the blade of the totality of the basin of Aisne (260 millimetres) and the Seine (240 millimetres). The specific Flow of the river (or Qsp) reached the figure of 13,4 liters a second and per square kilometer of basin.

Random links: