Until the 70s, the lower course of the Arga River near the confluence with the Aragon River flowed with a meandering channel, occupying a wide flood plain characterized by intense fluvial dynamics. In this situation, it was considered necessary to carry out works to contain river floods, by rectifying and channel the section stretching from the town of Falces to the mouth of the Aragón River.
In the mid-80s, channeling of the river was observed to be insufficient, with the river overflowing during certain flood events. In addition, shortening of the new stretch of river caused an increase in flow speed, resulting in serious imbalances and damages in this area of great ecological interest.
These phenomena have worsened in recent years due to the effects of climate change, among other factors.