Río Bermejo
The Río Bermejo is an important river of Bolivia and Argentine, tributary of the Río Paraguay, therefore tributary of a tributary of the Río Paraná.
Cours superior
He is born in a mountainous region from the Tarija in Bolivia in south-west from the locality from Chaguaya and near Quiaca (frontier town in Argentinian province of Jujuy). In its course higher its flow rises following the contribution of its left affluent the Río Grande of Tarija on the level of the site called Juntas de San Antonio . Consequently Bermejo is a completely Argentinian river. On its right margin it receives around San Ramón of Nueva Orán water of the Iruya, and around Embarcación and Pichanal, always from the right-sided, the important contribution of the Río San Francisco which drains the Yunga S of the area of Jujuy.
Cours inferior
He is consequently navigable for boats of average gauge and traverses the plain of the Chaco Central. Its bed is divided there into two arms, the Southerner or Bermejito corresponding to the old bed of Bermejo, and the septentrional one (currently, by far, most abundant) receives the name of Río Teuco.
Teuco (or Bermejo Nuevo) leaves the province of Salta and starts to form the border between the provinces of Formosa and Chaco, while Bermejito (or antiguo Bermejo) runs inside the province of Chaco in a very sinuous and often dry bed, travesant the area of El Impenetrable. On his banks one can admire the ruins of the old cities of Concepción del Bermejo, San Bernerdo de Vértiz there Cangayé. Teuco or current Bermejo is thrown in the Río Paraguay vis-a-vis the Paraguayan city of Pilar.
Precipitations
The basin of Bermejo is in a zone with multiple climates. On a short distance it significantly varies semi-arid cold climate in the west, towards a wet tropical climate in the east. The relief is a very important factor so that the maximum ones of precipitations present themselves in the area subandine is cordillera, with more 2 200 mm annual, decreasing on the one hand up to 200 mm towards the west (Area of the Eastern Cordillera) and on the other hand until 600 mm towards the east in the center of the area of the Chaco. In Chaco, they increase then until 1 300 mm in the sector of the confluence with the Río Paraguay (Area of Wet Chaco).
Basin and flow
The surface of its basin is of 123 162 km ², distributed between the Bolivia (11 896 km ²) and the Argentinian (111 266 km ²). The very large majority of its course is held in this last country.
Its flow is about 410 m3 a second, of which 40% are due to San Francisco.
Sediments
The average concentration of the sediments of the río Bermejo (7 to 8 kg/m3) is one highest of America, about 100 million tons per annum. Most of those is torn off at the time of the large peaks of rains thus of risings, following the intense erosive processes on unconsolidated deposits. Those are located especially in the basins of the Iruya rivers and San Francisco. One estimates that the system of Iruya contributes to nearly 50% of volume, that of the Río San Francisco at 25%, that of the Bermejo-Tarija system bringing the 25% remainder of the total of sediments.
External bonds
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surface Basins in Argentina