Vajont Dam
The Vajont Dam is a disused dam in northern Italy. It is one of the tallest dams in the world, with a height of.
It is situated in the valley of the Vajont River under Monte Toc, in the municipality of Erto e Casso, 100 km north of Venice.
The dam was conceived in the 1920s and eventually built between 1957 and 1960 by Società Adriatica di Elettricità, at the time the electricity supply and distribution monopoly in northeastern Italy. In 1962 the dam was nationalized and came under the control of ENEL as part of the Italian Ministry for Public Works.
On 9 October 1963, during initial filling, a landslide caused a megatsunami in the lake in which 50 million cubic metres of water overtopped the dam in a wave of, leading to the complete destruction of several villages and towns, and 1,917 deaths. Although the dam itself remained almost intact and two-thirds of the water was retained behind it, the landslide was much larger than expected and the impact brought massive flooding and destruction to the Piave Valley below. This event occurred after the company and the Italian government concealed reports and dismissed evidence that Monte Toc, on the southern side of the basin, was geologically unstable. They had disregarded numerous warnings, signs of danger, and negative appraisals, and the eventual attempts to safely control the landslide by lowering the lake's level came when the landslide was almost imminent.
Construction
The dam was built by SADE, the electricity supply and distribution monopoly in northeastern Italy. The owner, Giuseppe Volpi di Misurata, had been Mussolini's Minister of Finances for several years. The 'tallest dam in the world', across the Vajont Gorge, was conceived in the 1920s to control and harness the Piave, Mae, and Boite rivers, and to meet the growing demand for power generation and industrialization. Not until the confusion after Mussolini's fall during World War II was the project authorized, on 15 October 1943.The dam wall had a volume of 360,000 m³ and held up to 168,715,000 cubic meters of water. The dam and basin were intended to be at the centre of a complex system of water management in which water would have been channeled from nearby valleys and artificial basins located at higher levels. Tens of kilometres of concrete pipes and pipe-bridges across valleys were planned.
In the 1950s, SADE's monopoly was confirmed by post-fascist governments, and it bought the land despite opposition by the communities of Erto and Casso in the valley, which was overcome with government and police support. SADE stated that the geology of the gorge had been studied, including analysis of ancient landslides, and that the mountain was believed to be sufficiently stable.
Construction work started in 1957, but by 1959 shifts and fractures were noticed while building a new road on the side of Monte Toc. This led to new studies in which three experts separately told SADE that the entire side of Monte Toc was unstable and would likely collapse into the basin if the filling were completed. All three were ignored by SADE. Construction was completed in October 1959, and in February 1960, SADE was authorised to start filling the basin. In 1962 the dam was nationalized and came under the control of ENEL as part of the Italian Ministry for Public Works.
Early signs of disaster
On 22 March 1959, during construction of the Vajont Dam, a landslide at the nearby Pontesei Dam created a high wave that killed one person.Throughout the summer of 1960, minor landslides and earth movements were noticed. However, instead of heeding these warning signs, the Italian government chose to sue the handful of journalists reporting the problems for "undermining the social order".
On 4 November 1960, with the water level in the reservoir at about of the planned, a landslide of about collapsed into the lake. SADE stopped the filling, lowered the water level by about, and started to build an artificial gallery in the basin in front of Monte Toc to keep the basin usable even if additional landslides divided it into two parts.
In October 1961, after the completion of the gallery, SADE resumed filling the narrow reservoir under controlled monitoring. In April and May 1962, with the basin water level at, the people of Erto and Casso reported five "grade five" Mercalli intensity scale earthquakes. SADE downplayed the importance of these quakes. SADE was then authorized to fill the reservoir to the maximum level.
In July 1962, SADE's own engineers reported the results of model-based experiments on the effects of further landslides from Monte Toc into the lake. The tests indicated that a wave generated by a landslide could top the crest of the dam if the water level was or less from the dam crest. It was therefore decided that a level below the crest would prevent any displacement wave from over-topping the dam. However, a decision was made to fill the basin beyond that, because the engineers thought they could control the rate of the landslide by controlling the level of water in the reservoir.
In March 1963, the dam was transferred to the newly constituted government service for electricity, ENEL. During the following summer, with the basin almost completely filled, slides, shakes, and movements of the ground were continuously reported by the alarmed population. On 15 September, the entire side of the mountain slid by. On 26 September, ENEL decided to slowly empty the basin to, but in early October the collapse of the mountain's south side looked unavoidable: in one day it moved almost.
Landslide and wave
On 9 October 1963, engineers saw trees falling and rocks rolling down into the lake where the predicted landslide would take place. Before this, the alarming rate of movement of the landslide had not slowed as a result of lowering the water, although the water had been lowered to what SADE believed was a safe level to contain the displacement wave should a catastrophic landslide occur. With a major landslide now imminent, engineers gathered on top of the dam that evening to witness the tsunami.At 10:39 pm, a massive landslide of about of forest, earth, and rock fell into the reservoir at up to, completely filling the narrow reservoir behind the dam. The landslide was complete in just 45 seconds, much faster than predicted, and the resulting displacement of water caused of water to overtop the dam in a -high wave.
The flooding in the Piave Valley from the huge wave destroyed the villages of Longarone, Pirago, Rivalta, Villanova and Faè, killing around 2,000 people and turning the land below the dam into a flat plain of mud with an impact crater deep and wide. Many small villages near the landslide along the lakefront also suffered damage from a giant displacement wave.
Villages in the territory of Erto e Casso and the village of, near Castellavazzo, were largely wrecked.
Estimates of the dead range from 1,900 to 2,500 people, and about 350 families lost all members. Most of the survivors had lost relatives and friends along with their homes and belongings.
The dam was largely undamaged. The top or so of masonry was washed away, but the basic structure remained intact and still exists today.
Causes and responsibility
Immediately after the disaster, the government, politicians and public authorities insisted on attributing the tragedy to an unexpected and unavoidable natural event.The debate in the newspapers was heavily influenced by politics. The paper l'Unità, the mouthpiece of the Partito Comunista Italiano, was the first to denounce the actions of the management and government, as it had previously carried a number of articles by addressing the behaviour of the SADE management in the Vajont project and elsewhere. Indro Montanelli, then the most influential Italian journalist and a vocal anti-communist, attacked l'Unità and denied any human responsibility; l'Unità and the PCI were dubbed "jackals, speculating on pain and on the dead" in many articles by the Domenica del Corriere and a national campaign poster paid for by Democrazia Cristiana, the party of prime minister Giovanni Leone. They attributed the catastrophe only to natural causes and God's will.
The campaign accused the PCI of sending agitprops into the refugee communities, as relief personnel; most of them were partisans from Emilia Romagna who fought on Mount Toc in the Second World War and often had friends in the stricken area.
Democrazia Cristiana accused the Communist Party of "political profiteering" from the tragedy. Leone promised to bring justice to the people killed in the disaster. A few months after he lost the premiership, he became the head of SADE's team of lawyers, who significantly reduced the amount of compensation for the survivors and ruled out payment for at least 600 victims.
The Democrazia Cristiana's newspaper, La Discussione, called the disaster "a mysterious act of God's love", in an article that drew sharp criticism from l'Unità.
Apart from journalistic attacks and the attempted cover-up from news sources aligned with the government, there had been proven flaws in the geological assessments, and disregard of warnings about the likelihood of a disaster by SADE, ENEL and the government.
The trial was moved to L'Aquila, in Abruzzo, by the judges who heard the preliminary trial, thus preventing public participation, and resulted in lenient sentencing for a handful of the SADE and ENEL engineers. One SADE engineer committed suicide in 1968. The government never sued SADE for damage compensation.
Subsequent engineering analysis has focused on the cause of the landslide, and there is ongoing debate about the contribution of rainfall, dam level changes and earthquakes as triggers of the landslide, as well as differing views about whether it was an old landslide that slipped further or a completely new one.
There were a number of problems with the choice of site for the dam and reservoir: the canyon was steep sided, the river had undercut its banks, and the limestone and claystone rocks that made up the walls of the canyon were inter-bedded with the slippery clay-like Lias and Dogger Jurassic-period horizons and the Cretaceous-period Malm horizon, all of which were inclined towards the axis of the canyon. In addition, the limestone layers contained many solution caverns that became only more saturated because of rains in September.
Prior to the landslide that caused the overtopping flood, the creep of the regolith had been per week. In September, this creep reached per day until finally, the day before the landslide, the creep was measured at.
Reconstruction
Most of the survivors were moved into a newly built village, Vajont, 50 km south-east on the Tagliamento River plain. Those who insisted on returning to their mountain life in Erto e Casso were strongly discouraged. Longarone and other villages in the Piave Valley were rebuilt with modern houses and farms.The government used the disaster to promote the industrialization of the north-east of Italy. Survivors were entitled to 'business start-up' loans, public subsidies and ten years tax exemption, all of which they could 'sell on' to major companies from the Venice region. These concessions were then converted into millions of lira for industrial plants elsewhere. Among the corporations were Zanussi, Ceramica Dolomite, Confezioni SanRemo, and SAVIC.
Compensation measures did not clearly differentiate between victims and people who lived nearby; thus much of the compensation went to people who had suffered little damage, creating a negative public image.
A pumping station was installed in the dam basin to keep the lake at a constant level, and the bypass gallery was lengthened beyond the dam to let the water flow down to the Piave Valley. The dam wall is still in place and maintained, but there are no plans to exploit it. The dry basin, filled with landslip, has been open to visitors since 2002.
The dam today and memorials
In recent years there has been a revival of interest both by researchers with specialist interest, and sightseers. The dam, now owned by ENEL, was partially opened to the public in 2002 with guided tours and access to the walkway along the top and other locations. In September 2006 an annual non-competitive track event, called "Paths of Remembrance", was inaugurated, which allows participants to access some locations inside the mountain.On 12 February 2008, in launching the International Year of Planet Earth, UNESCO cited the Vajont Dam tragedy as one of five "cautionary tales" caused by "the failure of engineers and geologists".
For 2013, on the occasion of the fiftieth anniversary of the disaster, the region of Venice set aside one million euros for safety works and recovery of tunnels inside the mountain which were part of the Colomber Road.
The memorial church in Longarone – constructed over the strong opposition of the surviving parish priest – is a late masterpiece of the famous architect Giovanni Michelucci.
In the media
After the initial worldwide reporting, the tragedy became regarded as part of the price of economic growth in the 1950s and 1960s.Interest was rejuvenated by a 1997 television program by Marco Paolini and, "Il racconto del Vajont".
In 2001, a docudrama about the disaster was released. A joint production of Italian and French companies, it was titled :it:Vajont - La diga del disonore|Vajont—La diga del disonore in Italy, and :fr:La Folie des hommes|La Folie des hommes in France. It stars Michel Serrault and Daniel Auteuil.
The tragedy was included in the 2008 documentary series Disasters of the Century.
The TV show Seconds From Disaster featured the event in episode two, "Mountain Tsunami," of its fifth season in 2012.
In 2013, the eleventh stage of the Giro d'Italia finished in Vajont to commemorate the fiftieth anniversary of the disaster.