Atlantic Basin Slope

A watershed basin is the set of catchments draining into the sea itself. In the Iberian Peninsula there is a great disimetía between the Atlantic and Cantabrian slopes (in which lead 69%) and the Mediterranean side (31%). The cause is the slope of the plateau to the west from the Iberian System. The rivers on the Atlantic side are long at birth near the Mediterranean and the Atlantic lead. Their erosive power is low, given that run through plains where just sink, but they form gullies on the slopes. Its flow is abundant, because they have numerous tributaries, but its réfimen is irregular. They have low water in summer coinciding with the minimum of precipitation and flooding in the autumn and spring rains. Orogenisis char formation process by folding terrestrial reliefs, raised by the clash of African and Eurasian plates during the Tertiary. Caused the elevation of the Pyrenees, Iberian subplate union of mainland Europe, and Betic Cordillera remained between the two depressions, the Catalan Coastal Range, the mountain ridges of the plateau, the base of the plateau experienced fractures and faults and established network river.