reservoirs

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

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Drought has been one of the recurring themes of recent years. Both the lack of rains and their diverse consequences have more than a five years in the informative agenda. That is why the question of how much water we have left has asked Very diverse ways. There is only one problem: we are not really able to answer it. Moreover, what we know that our water reserves They are usually below what the data indicates. The reason is in something as natural as erosion and sedimentation processes, but its consequences They have been worrying the experts for years. Throughout their channel the rivers transport small particles of rock and organic matter that tend to accumulate at certain points of the route, either on the river bed, in river deltas or in its meanders. The reservoirs are another of the auspicious places in which the water tends to “release” these particles. The swamp floor Thus tends to accumulate sludge. The first problem that this generates is the loss of swamp capacity. The higher the volume of this occupied by sediments less is the amount of water it can store. The second problem is that we do not know exactly how the sediments accumulate in each swamp since it can vary depending on the characteristics of each basin and each reservoir. If we don’t know how many sediments we have, we can’t be sure how much water we have left. The weight of the terrams Estimates on the weight of the terrain, which is how this accumulation of sediments is known in the reservoirs, vary. A Batimetry Study made in 2018 For the Tajo Hydrographic Confederation in the Entrepeñas and Buendía reservoirs, he estimated that the accumulation of these sediments was insignificant. At the opposite end, Another batimetry studyis made by the Segura Hydrographic Confederation, estimated that its reservoirs could have lost between 10 and 40% of its capacity due to the incidence of this phenomenon. They highlighted the case of the Lorca reservoir, built at the end of the 19th century, which would be at the upper end of this fork. Estimates made for the whole Spanish reservoirs are limited. A study conducted from 110 reservoirs estimated that The loss of capacity could be around 5%. José Luis Casamor and Antoni Calafat, from the University of Barcelona, They warned in 2018 that uncertainty was high in this estimate, since the possibility of extrapolating the results of this study to more than a thousand remaining reservoirs was limited. This is a problem on which experts carry years warning. The study carried out in the Segura Basin, for example, was carried out in 2017, while Casamor and Calafat’s work was published in 2018 in the publication Earth and technology of the ICOG (Illustrious Official College of Geologists). In a second article (also published in 2018) in The conversationCasamor explained that that of terraces was a problem with “faces and difficult execution” solutions “. Cleaning the sediment reservoir bed is an arduous task that requires the emptying of the reservoir, something that can be even more complicated in old reservoirs, explains Casamor. Prevention is a better option for this expert. This is to incorporate knowledge about the accumulation of sediments in the infrastructure design process. Another inclusion of dikes prior to the reservoir may contain the sediments up so that they do not accumulate in the reservoir. Other proposed measures to contain the sediments upstream include reforestation. The plants contain the erosion of the soil, which makes less particles reach the rivers and from there to the reservoirs. In this sense, rural abandonment has also been indicated as partial responsible for the situation. The fires also contribute to the arrival of sediments to the channels, so the fight to contain them can also contribute their grain of sand. In Xataka | The time of truth of the Spanish reservoirs: how are they going to endure the heat after rains that has left them overflowing Image | Ray Raimundo

The reservoirs are almost 22% above the average of the last decade. There is an “but” important before celebrating

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The forecasts of meteorologists seem to indicate that spring You have your days counted: Next week we will see an increase in the temperatures and models of the State Metorology Agency, they foresee that in the middle of June the rainfall is less than what is usual for these dates. Despite this, this short spring has been intense, and that It has been reflected In the reservoirs. 77.5%reserves. The latest data indicates that the water reserve has been placed this week at 43,407 cubic hectometers (HM³), 77.5% of its capacity. As it stands out The Ministry for Ecological Transition and Demographic Challenge, to this have contributed “abundant” rainfall in the Peninsula and especially in Lugo, where 55.8 mm have been reached. The internal basins of the Basque Country (95.2% of its capacity), the Duero (92.6%), and the western Cantabrian basins (92.2%) They are the ones closest to their theoretical maximum. In the south stands out The River Basin Odiel, red and stonesat 91.7% of its capacity. Almost 22% more than average. We have been more than a year in which the reservoirs accumulate more water than the average of the previous 10 years. The current 43,407 hm³ represent an increase of 21.79% above the average of the past decade, 35,641 hm³. It is good news, but it should be remembered that the data of the Decenal has been significantly weighed by last decade. If we go To data from five years ago, we will see that the average filling of the previous ten years (2010-2019) was 74.3% global and 71.8% if we focus on the reservoirs of consumptive use. The average of the last 10 years is now quite far, in 63.7% for the set of reservoirs, and in 58.1% if we focus on consumptive use. Unequal state. As usual, there are marked differences in the filling level of the different basins. We indicated before some of those that are closest to the full filling, all of them above 90% of their capacity. At the other end, the southern and southwest basins remain at relatively low levels, highlighting the safe basin, at 31% of its capacity. The positive reading is that even this basin has seen its level of filling in recent months. This last week, in fact, the basin has seen an increase of almost 1% compared to the previous week. The Andalusian Basins of the Mediterranean, also among the most empty, have also experienced a slight increase in their volume, until approaching the 57.6% of its capacity. The negative note is put by the Guadalete and Barbate basin, the second with the lowest average filling (at 54.88%), which has lost six Hm³ in recent days, a reduction of 0.36%. Of course, the basin shows a markedly superior filling last year by these dates (30.28%) and also slightly higher than the average of the last 10 years (53.31%). The end of spring. The state of the reservoirs allow us to face with slight optimism an uncertain and imminent summer. Meteorological forecasts They point out a drastic increase in temperatures in the next few days, and not just that. Aemet’s medium -term predictions also indicate that the trend of the coming weeks will not only point to warmer temperatures than usual by these dates, but also towards precipitations below average. This seems to imply the end of spring, at least from the meteorological point of view, and the beginning of a summer that we do not know what will hold us. In Xataka | “Thank you so much, reservoirs.net”: Spanish men are developing a peculiar obsession with swamps Image | Alina Rossoshanska / Miteco

While reservoirs from all over the country reach record figures, Spain still has a black dot of the drought: Almería

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For eighth consecutive week, Spanish reservoirs have risen again. It was to be expected: the same rains that have “bitter” vacations to many during Holy Week are now becoming good water news. For the first time in many years, Spain has exceeded the 75% barrier in reservoir water. And yet, this enthusiasm does not reach a very specific area of ​​the country: The Southeast. Where the rains do not arrive. If we see an autonomous map of the country’s water reserves, we will see all of Spain in blue (light, medium or dark). All except Murcia; That, at 36.49% of its capacity, it can only appear in colors close to orange or red. And, although Reservations have grown a lotthe safe basin is still very touched with 10 points less than the historical average. For more Inri, it cannot be said that it is a management problem (although the management of the basin has always been a controversial issue). It is something that extends, as I say, to all southeast. The province of Alicante is at 31.75%. That is to say, above the terrible data last yearbut without reaching the average of the last decade. And then there is Almeria. Almería? What happens in Almeria? That hides among the excellent data from Andalusia (60.59%) and the more than good of the Andalusian Mediterranean basins (55.54%), The province of Almería has a huge problem: its reserves are 11.16%. Slightly better than a year ago, but still below Lbetter 2024 data. Almería’s problem with water is not new. That’s true. If we look, the historical average of the last 10 years in The province is 13.13%. Very slightly above the current figures. And we talk about a place with a huge weight of water intensive industries (agriculture and tourism); one that, in addition, is suffering like nobody Desertification problems and overexploitation (and pollution) of aquifers. As They said a few weeks ago from Ecologists in Action“Seeing Llover away the ghost of drought”, but in areas like Almeria that drought has been anywhere. It is a false impression that only management can difficulty. Lose the water war. At least there are three Almeria regions in which drought not only persists, but It is completely chronified: Níjar, Sierra de los Fizodes and El Levante. And that we talk about the Spanish province that adds the greatest number of rafts of different sizes and characteristics (27,000according to the latest estimates). In 1987, “the first reports on the deterioration of the aquifers of the Dalías field were announced, the point where intensive agriculture was born.” And the problem has only increased: “Every year, Almería starts its agricultural campaign with a structural deficit of around 200 cubic hectometers.” The story is simple, too simple. Almería wanted to become the great laboratory against desertification, but has become a battle territory. A battle that little by little We are losing. Image | Alicia Camacho In Xataka | Arid soils are devouring Almeria, Murcia and Alicante faster than we expected. And it does not seem that we can stop it

a macroproject of 1,800 MW without the need for new reservoirs

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In recent weeks the heavy rains They have filled to the limit different reservoirs, forcing many of them to open your gates. But what if all That water will be stored To create a giant battery for renewables? In Galicia they have got to work. The biggest in Spain. The great reversible hydroelectric power plant will be known as Conse II and will be located on the Bibey River, in the province of Ourense, According to Vigo’s lighthouse. In this same medium they have pointed out that the project will be lifted taking advantage of the 690 meter altitude difference between the Cenza and Bao reservoirs. In addition, the initiative will be developed by Iberdrola and will have an investment of 1,500 million euros. An underground giant battery. The new project is also known as the pumping hydroelectric plant. The operation of the plant is as energy storage when there is an excess renewable energy in the system. More easily, the plant uses that excess to pump water from a reservoir less than a superior. So when there are demand peaks, water will fall again, moving turbines that will generate electricity, acting as a natural battery. An expanded project. According to Galicia’s voicethe original idea was to build a 900 MW plant, but Iberdrola decided to double its capacity to 1800MW after additional studies. However, these same analyzes detected geological risks in the area where the great underground cavern will be excavated that will house much of the plant. More studies. The Xunta de Galicia has given the approval To carry out new geotechnical research, as the Galician medium has learned. In addition, these new studies include the opening of an access gallery of 1,500 meters and another of 200 meters, which will allow analyzing the land directly before starting the main work An environmental problem? In recent months, There were many demands to stop different wind -collo -projects due to the environmental impact, but the Supreme Court recently has given The reason for renewables. As the Vigo lighthouse has been recordedthe authorities have estimated that the environmental impact will be minimal as it is an underground infrastructure. In addition, the Ministry of Environment He has stressed that will not affect the area of ​​special conservation (ZEC) of the central massif, belonging to the Natura 2000 Network. However, as they have explained from progressthe environmental report has indicated several aspects that must be managed during the execution of the works, such as the large volume of land movement the acoustic impact and vibrations during construction. For this reason, noise levels will be required to comply with current regulations and that Iberdrola present a previous study on possible conditions to nearby populations. More storage. Spain closed last year with 63.9% of the total renewable generationbeing wind and solar the ones that produce the most. For this reason, and given the intermittency of these sources, it is important that it will continue to look for ways to store the surplus. According to has detailed the voice of Galiciathe works of this hydroelectric plant will last about 21 months, to which three more months are added to complete the technical polls, so it will still wait. Image | Dichiano man Xataka | “Thank you so much, reservoirs.net”: Spanish men are developing a peculiar obsession with swamps

The rains have left a splendid Spain and a tourist destination is benefiting from it: the reservoirs

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“While the world wobbles, nature seems to want to compensate us.” This phrase of Jose Luis Gallego summarizes very well what is happening in the Spanish countryside. With full swamps and aquifers recharging, Spain is living “its most splendid spring in decades.” And that has an unexpected beneficiary: tourism. The many droughts in each drought. Galician explained in El Confidencial That, in broad strokes, there are three types of droughts: the meteorological (linked to the shortage of rainfall), the hydrological (which has to do with the water in the system. – rivers, swamps and aquifers) and the edaphic (which is related to the soil and its ability to provide the vegetation of the water it needs). The good news is that we have overcome all three and the land knows. It is no longer that the fields of Extremadura, Castilla or Andalusia are a show; It is that even the ugliest and dirty surroundings of any Spanish city are pretty. It is true that the wetlands plagued by birds and overflowers of vegetation are the areas where this “March miracle” It shows morebut even the most arid places are full of surprises. The Sea of ​​Castile. The best example can be seen in that corner between the provinces of Cuenca and Guadalajara that is usually known as “Mar de Castilla“. There are five reservoirs (Almoguera, Bolarque, Entrepeñas, Estramera and Zorita) in the Middle Tagus and one more (good day) in the Low Alcarria with a capacity of 2,515 hm³ and a tourist capacity that has lived better times. In the 60s, as consequences of the hydrological and developmental policies of the Franco regime, the region was filled with urbanizations, restaurants and small embarrassing. It became a tourist claim that improves infrastructure, first, and The Tajo-Segura transfer, afterthey put in a slow decline. The drought of recent years did the rest. However, with the rains of March, the Sea of ​​Castile It is back. How to turn water into gold. Just read the chronicles of the local press to verify that the residents of the riverside municipalities are really excited. Entrepeñas has only transferred water to good times eight times since 1956, The last almost 30 years ago; But this weekend it has happened again. The swamp has such a amount of water that you have been able to see really unprecedented images (or that had been not seen decades). He Runrun of the situation He has made “every day more curious who arrive at the riverside region to witness in the first person and immortalize with their cameras or with their mobile phones such an exceptional moment and who knows if unrepeatable.” The question that is asked in the Sea of ​​Castile is how much the situation will endure and if the Lcoal Tourism of it can be used. Although, in reality, it is a question that many more people are asked. Our country has more than 1,200 swamps and “almost double the fresh water coast than Marina in the country.” The reservoirs have historically been much more than water reserves: they have been tourist attractions that contributed to stop the demographic bleeding of emptied Spain. The problem is that, in recent decades, that interest has been falling little by little. And rural tourism has failed to fill the hole fully. Therefore, the councils of Cáceres, Lugo, Badajoz and the 530 municipalities associated with the Federation of Municipalities with Hydroelectric Plant and Embalses of Spain (15 communities and 46 provinces) have decided Bring Pantanos Tourism back. Upon? Indeed and with A very simple value proposal: Adventure activities (“Barranquismo, the paragliding or balloon walks”, “Boat routes or kayak, candle courses, sport fishing or paddle-south”, but also “horseway or bicycle routes, enjoy the observation of birds or practicing hiking”), proximity gastronomy and cultural, monumental and historical heritage. A new solution for a worrying problem. As We counted a few days agowhile in 2024 the hotels in Spain registered 7.5% more of foreign travelers, the speakers of Spanish tourists stagnate with a minimum rise of 0.2%. The price increase and the massification of the most important tourist areas are the main reasons for that break of national tourism. Therefore, now it is the least exploited areas that seek their part of a cake that grows 4.9% per year. And, seeing the photos of the country’s reservoirs, it makes a lot of sense. Image | Riaño, León (Paulo Valdivieso) | Pelayo Arbués | Eduardo Kenji Amorim In Xataka | Mass tourism has the days counted in Spain thanks to a phenomenon outside its control: extreme heat

It has rained so much in Spain that the reservoirs are up. And still nobody wants to remove water restrictions

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For more than a month, when Garoé, Éowyn, Herminia and Ivo They synchronized to water the peninsula, the water level of Spain has been decreasing day by day. March has changed everything. In just one week, the accumulated water increased almost 3% and 2025 remains above the 2024, 2023 records and the average of the last 10 years. Aemet He has already warned That comes more water and that “the long duration drought, in which Spain entered at the end of 2023 and that still lasts at the end of February, will also end up reversing most likely with what is raining” Ahroa himself. And yet, the administrations have come out in Tromba … To say there will be no changes. Catalonia is the best example: although the reserves already exceed 40% and is, for good, in an unpublished situation for more than 50 months, the Minister of Territory and spokesman of the Generalitat, Silvia Paneque, He explained that the situation “It does not completely solve the situation we are living.” In Andalusia the reaction has been similar. In fact, the Board has delayed Until the end of March or early April, making any decision on drought. In Murcia they go further and not only is not withdrawing measures, but they are working on Expand measures To stop the drought. And, on paper, it makes sense. At the purely administrative level and as explained, for example, the Catalan Water Agency, from the pre -alert level, can be considered that The drought has sent. However, water stress problems in the interior basins of Catalonia, Segura or the Andalusian Mediterranean basins are systemic. In that sense, no one advocates directly to withdraw control measures and restrictions. The problem is that with that it is not enough. And it is not enough because the fact that the restrictions are not removed means nothing. Moreover, it can be even worse. We know it from experience. I quote it often, but Datadista has a fantastic investigation In which it looks very clearly how “from the deep drought of the 1990s, each dry period has served to implement emergency measures (…) or allow practices that were not eliminated when the rains returned, they were used to expand irrigation, increasing the problem of overexploitation and contamination of aquifers and the wetlands to which they feed.” That is, the fact that administrations resist raising prohibitions does not serve much if that surplus takes advantage of efficiency improvements to implement policies that, ultimately, “make the country’s water system more fragile” instead of favoring that becoming more robust. The most important drought happens when drought ends. That is the great historical lesson that can give us the water management of Spain: that the crucial is what happens when the weather drought has disappeared and we have to make decisions about what to do with all that water we did not have before. In that context, prudence calls are interesting and necessary. But they need a transition plan behind, but we will simply be building closer and closer to that cliff called climate change. Image | ECMWF In Xataka | After becoming the most humid March, Konrad also wants to turn it into one of the coldest: the snow is back

The intense rains of March have filled the reservoirs of Spain with water. Good news for the Light’s Invoice

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In recent weeks, in Spain it has rained so much that the swamps of the peninsular center are so full that they will have to unwind. A news that will directly influence the electricity bill, but for good. With which we never count. When we talk about generation and renewable capacity, the two sources that come to mind are usually solar and wind. However, there are more renewables that provide energy to the electrical system such as hydroelectric plants. This year, in addition, the rains have arrived as a gift because wind energy has failed in its contribution, which has made the hydroelectric take more prominence. How will it affect our light bill? In this situation of incessant rainfall throughout the Spanish territory, which also will lengthen throughout the month of Marchhydroelectric plants have already generated more than 9,000 GWh, which represents a 18.4% of energy mix. In addition, the generation and storage capacity of hydroelectric plants He has reached The 5,599 MW, which represents 20.65% of the total system structure. This contribution is very important to see in the coming months a decrease in light prices. The rain, an ally. This phenomenon will help lengthen the low price period, which is important for homes and companies that fear the increase in rates. Compared to the previous years, and taking into account that this year wind energy He has been failing In their contribution, the rains have become great allies. It can warm up. If we talk about hydroelectric plants, we have to talk about their storage of energy: swamps. Currently, reservoirs in Spain are in Very good situation thanks to the stormwith a generation capacity of 60.90%. In other words, reservoirs have A large amount of energy storedaccording to Miteco data we would be talking about a Total capacity of more than 17,000 MW. To see it with data, the reservoirs have increased their volume by 296 HM³ (1.7% more). In the case of the Alcántara reservoir, One of the great batteries of Tajohas accumulated 257 hm³ of water in a week, which is equivalent to 454 GWh of electricity. Conflict of interest. Although there is an increase in hydroelectric generation due to rains, there is a problem with the Reservoir management. Hydroelectric plants have an economic interest in maximizing their production, which can lead them to make decisions about water unworthy. These cases have even occurred when water reserves should have been used for another use, such as Agricultural irrigation. It will remain to see how companies They store and release water. Forecasts In these days of intense rain and with the arrival of spring we will have to add the thaw of the mountains, so the reservoirs are expected to continue filling. This situation will ensure an even greater hydroelectric production capacity in the coming weeks, prolonging the low price phase. Hopefully enough to be extended, while in the European Commission they solve the issue of Down 5% to VAT In the light invoice. Image | Iberdrola Xataka | We do not have even half a month and Aemet is already registering unpublished records in places like Huelva: the most rainy March

Accumulated sediments are a huge problem for reservoirs. And in the Ebro they have taken drastic measures

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The reservoirs, both those for hydroelectric use and those for consumptive use, are a vital element in the hydrological panorama. However, for some time, experts warn of a problem that is aggravated over time and affects their functionality. He sediment problem. Half year of works. The works initiated last August to recover the drain of the Ebro reservoir will extend, predictably until 2026, according to They have indicated from The Montañés newspaper. The works, in addition to introducing improvements into one of the swamp drains, intend to recover their functionality from the accumulation of sediments in this. The tasks, explains the local newspaper, will require a team of divers for 3.5 meters of accumulated silt next to the drain gates. The works, with a budget of 2.5 million eurosthey will imply the installation in each of the ducts of the security gates with By-Pass and gates for the regulation of flows. The Arija swamp has two drains, one side and the other located in the dam. It is the latter that, as a consequence of the accumulation of sediments, has lost the ability to perform its function. Key reservoir. The Ebro or Pantano de Arija reservoir is a key element in the Ebro hydrographic basin. It is one of the largest reservoirs in this hydrographic demarcation (behind those of Mequinenza and Canelles). Located in the immediate vicinity of the Cantabrian city of Reinosa, the border between this Autonomous Community and that of Castilla y León in the province of Burgos. According to the latest datathe reservoir Albeca now 348 hm³ of water, 64.3% of its capacity (541 hm³). Some data that do not always reflect reality, precisely due to the problem of sediments. Limiting the capacity. The problem of sediments Not only does it affect the functionality of the drains of the reservoirs: they also limit their capacity. Decades of use have led to a significant accumulation of sludge and sediments in the reservoirs, sediments whose volume implies a significant reduction in the storage capacity of the swamps. Estimates of this loss vary significantly, but the most pessimistic talk about a loss of up to 40% of the volume In some basins. A study in 110 reservoirs launched a more optimistic but still alarming estimate, A loss of 5%. The latest rains seem to have helped reverse the drought situation that still affected some areas. However, our ability to prepare for the next drought is limited by this accumulation of sediments in the reservoirs. Where the sediments are missing. As if this were not enough, the problem of the sediments left over on one side is the problem of those missing in another. In this case, In the Ebro Delta. The Ebro delta is nothing more than the result of the accumulation of sediments dragged by the river current. The installation of numerous dams in this hydrographic basin has reduced the arrival of this matter to the mouth, which, together with the natural coastal erosion, has put the delta ecosystem at risk. An ecosystem on which not only depends the local fauna, but also a part of the agriculture and the economy of the region. In Xataka | In a corner of Andalusia the reservoirs are at 94% of their capacity. It seems excellent news, but it is not so much Image | Josu Aramberri, CC by-SA 3.0

In a corner of Andalusia the reservoirs are at 94% of their capacity. It seems excellent news, but it is not so much

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Until a few months ago, drought was a problem that affected almost the entire country, even to the greatest northern areas that saw an important reduction in rainfall and even the introduction of temporary water savings measures. Now the situation has changed, although the threat is still in force in some areas of the country, especially along the Mediterranean coast. Odiel, red and stones, the exception. However, if we look at one of the maps that show us the Situation of Basin Reservoirs Hydrographic, perhaps otherwise what caught our attention. Surrounded by the great hydrographic basins of Guadiana and Guadalquivir, the Odiel basin, red and stones seems to show us a humid anomaly in the south of the Peninsula. The swamps of the basin are, according to the Last data availableat 94.3% of its capacity. This makes it the second largest hydrographic basin, behind the Internal Basins of the Basque Country (95.2%) and ahead of basins such as Galicia coast (87.6%) and the Eastern Cantabrian (83.6%). A figure that contrasts in a striking way with the state of the reservoirs in the hydrographic basins of its surroundings: 48.4% in the Pantans of the Guadiana, 40.5% in those of the Guadalquivir, and 30.5% in Guadalete-Barbate. What happens in this little basin for? Statistical issue? The first thing we can consider is statistics. The Hydrographic Basin of Los Ríos Odiel, Tinto and Piedras is a small basin, both in extension and capacity: the swamps of this Huelva basin can store a maximum of 229 cubic hectometers (HM³). Surrounded by greater extension demarcations, such as those of the Guadiana and the Guadalquivir, the most similar basin in extension in the south would be that of the Guadalete-Barbate. However, the Cadiz basin has A capacity of 1,651 hm³. This fact could justify the anomaly due to pure statistics: less capacity would imply greater ease for filling and emptying, more variability and with it more likely that at some time of time extreme values ​​are achieved. The problem is that the reservoirs of this area have been maintained rather persistent as the most full of the south. Rainfall. One of the reasons why the Odiel, Tinto and Piedras Rivers Basin attracts attention is due to the general contrast with the southern basins of the Peninsula, which in turn is associated with the fact that the South receives less rainfall than the north. Although that is true if we compare the north third with the rest of the country, the truth is that the image It is more complexand Andalusia is a good example of this. In Andalusia it exists A marked difference in rainfall between The Eastern Zone and the rest of the Autonomous Community, especially in the West. The province of Huelva is usually among those that receive the most water, being the north of the province one of the regions that record the most rainfall. To that we must add that 2024 was A slightly more wet year than the average in almost the entire province of Huelva. The beginning of 2025 has exacerbated this trend, with almost the entire province receiving more than double water than average During the month of January. The “dead” reservoir. The reservoirs of the Odiel basin, red and stones receive a lot of water, yes, but also others in Western Andalusia. To explain the phenomenon of this basin, perhaps we also have to attend to emptying. And here we find another determining factor: the reservoirs of this basin do not empty the same ease. The reason is pollution. This basin has a peculiarity, that of reservoirs useless for the contamination of its waters. To illustrate it, the El Sancho reservoir, The “Dead Reservoir” of the Odiel Basin. The waters of this reservoir are extremely acidic, with a pH value close to 3.6, to which high concentrations of toxic metals must be added, as explained In an article for The conversation Manuel Olías and José Miguel Nieto, both experts from the University of Huelva. The reservoir is in a situation of Perennial filling at 82.76%contributing 48 hm³ of waters to the accounts of the reservoirs of a basin that add up to a capacity, remember, of 216 hm³. The problem Nor is it exclusive of the El Sancho reservoir. Complementary explanations. None of the three explanations (size, rainfall and pollution) explains in itself the state of the reservoirs in this basin, but as a whole they can explain the anomaly of this basin and the associated problem. In Xataka | We have been trying to understand why droughts are more destructive than ever. We start having some idea Image | Miteco / Rodelar

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