Spain has so many reservoirs that it practically cannot build more. So in Aragon they are expanding them

The town hall of Fraga (Huesca) has started the necessary works to raise the dam of the 190,000 m³ reservoir that supplies the city by two meters. It may seem like a detail, something almost anecdotal in a country with 1,200 reservoirs and more than 56,000 hm³.

And it is. However, it is also the perfect metaphor for the enormous problem that is brewing at the bottom of our swamps.

The end of the Spanish miracle. For practical purposes, Spain does not build new dams because it already has 1,200. It is, in fact, one of the countries in the world with the most dams and, although there are some areas that could be ‘usable’, these are increasingly scarce, smaller and most unsustainable at an environmental level.

That is to say, even if we wanted to, we could not grow our reservoir capacity much. And there is no shortage of examples of this: Mularroya, in Zaragoza, has the dam completed, but with a nullity sentence for failing to comply with the Water Framework Directive; Biscarrués, in Huesca, is still under studybut the controversy over its environmental impact is enormous; Almudévar, although it has been completed for years, cannot be filled due to lack of pumping capacity.

Building a dam in the 80s was already almost impossible and the situation has only gotten worse. In fact, in the last 15 years, Only 20 reservoirs have been inaugurated, totaling 803.6 hm³

A problem that is little talked about. The country loses about 100 hm³/year due to clogging while the CEDEX projected falls runoff of -11%/-14% in the next 40 years. In other words, the real problem with Spanish reservoirs is not that we cannot build more, it is that the mud and sediments are robbing us of storage capacity. Mequinenza has already lost 10% of its capacity

And what do we do? That is the big question and it is where the example of the Fraga town hall is most interesting. Because many engineers have been arguing for years that, if we cannot create new dams on virgin valleys, we can still grow existing dams.

In Yesa, between Navarra and Aragón, the work (the most emblematic of this approach) would allow up to 1,079 hm³ to be added. More than the 803 of the other approach. Right now, as far as we know, the work is stopped due to some allegations. Where it has been carried out is in Santolea, Teruel, adding 81.75 hm³ to the original reservoir.

And why isn’t the process accelerated? Largely because many people believe that the dam model has reached its peak and believe that we must kill the culture of the reservoir: The storage capacity already exceeds the available water and adding more empty glasses does not create the water on its own.

The water war is one of the fiercest battles in the Spain of the future. And I don’t think anyone knows how to sign a peace treaty.

Imagwn | Yoann Laheurte

In Xataka | Our reservoirs have a serious structural problem. And experts have been warning us for years.