Loison (river)

Departments and crossed localities

Meuse (55): Billy-under-Mangiennes, Mangiennes, Jametz, Juvigny-on-Loison, Quincy-Landzécourt

Principal affluents

the Azanne , left bank, 13 kilometers,
the Brévonte , left bank, 12 kilometers,
the Thinte , left bank, 17 kilometers, which sprinkles Damvillers,
the Remoiville , left bank, 10 kilometers.

Hydrology

At the station of Han-lès-Juvigny

The flow of Loison was observed during one 39 years period (1969-2007), with Han-lès-Juvigny, small town of the department of the Meuse located little before its confluence with the Chiers. Surface studied there is of 348 km ², that is to say 97% of the total area catchment river which counts 359 of them.

The interannual medium flow or module of the river with Han-lès-Juvigny is of 3,83 m ³ a second.

Loison present of the seasonal fluctuations of flow marked enough, as it is very often the case in the east of France. The high waters are held in winter and are characterized by average monthly flows oscillating between 6,33 and 8,37 m ³ a second, from December to March included (with an in January maximum then February). As of at the end of March the medium flow drops quickly throughout spring to reach the period of low waters. Those, prolonged enough, take place in summer and at the beginning of the autumn, of at the beginning of June mid-October, involving a fall of the monthly medium flow going up to 0,679 m ³ in September, which remains appreciable.

With the low water levels, the VCN3 can fall until 0,14 m ³, that is to say 140 liters a second, which can be described as relatively severe, but normal is compared with the minimum flows of other rivers of the east of the country, like the Orne for example (VCN3 of 0,56 m ³, for a basin of 1 268 km ² and a module of 12,4 m ³) (see note).

As for the risings, they can be extremely important. The QIX 2 and QIX 5, or calculated flows of biennial and quinquennial rising, are worth respectively 53 and 74 m ³. The QIX 10 or calculated flow of decennial rising is of 87 m ³ a second, the QIX 20 of 100 m ³ and the QIX 50 of 120 m ³ a second. (see note). Let us note that these values of rising are close to the double of those of the Bar, river located rather near more at the west, tributary of the Meuse, and to which the surface of basin as the value of the module are rather close. One notices thus that the importance of raw with this latitude tends to increase by west in is until the maximas Lorraine plate.

The recorded maximum instantaneous flow with Han-lès-Juvigny was of 111 m ³ a second on May 27th, 1983, while the value maximum day laborer was of 101 m ³ a second the same day. If one compares the first of these values on a QIX scale various of the river, one notes that this rising, was intermediate between the risings vicennial and cinquantennale defined by the QIX 20 and QIX 50, and thus so exceptional, because statistically not intended to repeat itself every approximately forty years.

Loison is a relatively abundant river, rather well supplied with precipitations of its basin. The Lame of water past in its area catchment of 348 millimetres annually, which is a little higher than the overall average of France all confused basins, but normal to moderate is compared with the various rivers of the basin of the Meuse, generally extremely well provided. Its water blade is definitely lower than the average of the French basin of the Meuse observed with Chooz, close to its exit of the French territory (450 millimetres). The specific Flow (or Qsp) reached of this fact the figure of 11,0 liters a second and per square kilometer of basin.

On the level of the confluence with Chiers

The average interannual flow or module of the river to the confluence of Chiers, observed during 20 years (1970-1990), is worth 3,98 m ³ a second for a catchment area of 356,9 km ². The water blade run out in the basin of 352 millimetres, which is fairly raised, a little higher than that of the average of France, all confused basins, but weak is compared with the various rivers of the basin of the Meuse, generally very abundant. Thus its water blade is definitely lower than the average of the French basin of the the Moselle (445 millimetres with Hauconcourt), as well as Meuse with Chooz, close to its exit of the French territory (450 millimetres), and of the Chiers (419 millimetres with Carignan).

The specific Débit (or Qsp) of Loison at the end of the course is thus assembled at 11,16 liters a second and per square kilometer.

References

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