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Lago di Pontesei is a lake in the Province of Belluno, Veneto, Italy.

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Lago di Pontesei
Lago di Pontesei
Location	Province of Belluno, Veneto, Italy
Coordinates	46°20′13″N 12°13′34″E
Primary inflows	Maè
Primary outflows	Maè
Basin countries	Italy
Water volume	62,750 m3 (82,070 cu yd)
Surface elevation	93 m (102 yd; 305 ft)

The dam originally formed a much larger area, which reached the confluence with the Maresón torrent in the Pónt of Péez.

Pontesei Landslide

Pontesei Landslide

Native name	Italian: Frana di Pontesei
Date	March 23, 1959 (1959-03-23)
Time	7 (CET)
Coordinates	46.336973°N 12.226002°E / 46.336973; 12.226002
Type	Dam failure
Cause	Landslide
Deaths	1 (Arcangelo Tiziani)[1]
Missing	1 (the body was never found, it is the same person (Arcangelo Tiziani) that's also listed above as fatality) [1]
Very similar to the later Vajont Dam breach

Preceded by numerous warning signs, including the formation of cracks along the roadway bordering the reservoir, on the morning of March 22, 1959 a landslide, with an estimated volume of about 3 million cubic metres (110,000,000 cu ft), it broke away from the slopes of Mount Castellin and Spiz, on the left bank of the lake, on a front of 500 meters (1,600 ft) and fell in two to three minutes, partially filling the lake. Although the basin was 13 metres (43 ft) below the full load level the landslide caused a wave that overcame the dam and overwhelmed Arcangelo Tiziani,[1] a worker of a construction company, who was carrying out the construction of the power plant downstream of the dam, whose body was never found.[2] The accident is considered to have foreshadowed the Vajont dam disaster [it] thanks to the similar way it unfolded, and, while the Vajont Dam was built in neighbouring Longarone, it was observed with great concern.

The analyzes of the experts indicated that the collapsed material originally constituted a debris blanket, in some places even 20 metres (66 ft) thick [3]

Condition of the basin after the landslide

The rock collapsed, still clearly visible from the road, partially filled the basin (which until 1966 continued to be filled up to its maximum depth), forming a sort of promontory within the lake. ENEL significantly reduced its average load level for safety reasons, on the order of civil engineering after the 1966 flood.[4][5]

References

На других языках

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- [en] Lago di Pontesei

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[it] Lago di Pontesei

Il lago di Pontesei (775 m s.l.m.) è un piccolo bacino idroelettrico della Val di Zoldo, in provincia di Belluno, ricavato sbarrando il corso del torrente Maè con una diga costruita tra il 1955 e il 1957. Il 22 marzo 1959, una frana dal suo versante nell'invaso provocò un'ondata che causò una vittima, Arcangelo Tiziani.

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