Lake Naret

from Wikipedia, the free encyclopedia
Lake Naret
Lago del Narèt seen from the hiking trail along the north bank. View to the east
Lago del Narèt seen from the hiking trail along the
north bank. View to the east
Location: Canton of Ticino
Tributaries: Riale Sabbia, various other mountain streams
Drain: Maggia
Larger places nearby: Fusio
Lago del Narèt (Canton Ticino)
Lake Naret
Coordinates 686 798  /  147947 coordinates: 46 ° 28 '38 "  N , 8 ° 34' 8"  O ; CH1903:  686,798  /  147947
Data on the structure
Operator: Officine idroelettriche della Maggia SA
Data on the reservoir
Altitude (at congestion destination ) 2310  m above sea level M.
Water surface 73.4 ha
Reservoir length 1.1 km
Reservoir width 820 m
Catchment area direct: 4.05 km²
indirect: 6.02 km²
Design flood : 15 m³ / s
Particularities:

two dams

Swell:
Map Lago del Narèt.png

The Lago del Narèt is an artificial lake in the Swiss canton of Ticino in the municipality Lavizzara , the end of the 1960s by the Maggia power plants was created.

location

The lake is at the back of the Val Sambuco and was created by the damming of the still very young Maggia by means of the two dams Narèt I and Narèt II. The nearest town is Fusio . The target of the lake is located at 2310  m above sea level. M. . In the vicinity there are several small mountain lakes that drain into the Lago del Narèt. These include the Lago del Corbo and the Lago di Val Sabbia. Lake Scuro is located below the Narèt II dam.

Access road

The access to the Lago del Narèt is possible via a 14.2 km long road that starts at Fusio. Access to the street is regulated by barriers that are opened in summer according to the passability of the street. After the first barrier at Fusio, the road winds up on the eastern side of the valley to the Lago del Sambuco . The second barrier is at the dam wall, after which the road narrows to a width of 2.8 m. Although it is partly in bad condition, it can also be driven on with motor vehicles at a suitable speed. First it leads along the east bank of the reservoir to the northern end of the lake, where it begins to rise moderately. After about 6 km another barrier is reached at Alp Grasso di Dentro, which may still be closed in June. From there, the somewhat wider road winds up to the two dam walls of Lago del Narèt, which are located above the tree line . With the road consortium, the passability of the road is evident.

Both dams of the Lago del Narèt are passable. Towards the end of the access road, the entrance to the Narèt II dam branches off to the left. On the other side of the dam there is a gravel park area that is often used as a starting point for hikes to the Cristallinahütte , in Italian Capanna Cristallina . The 6.5 hour ascent from Fusio can be shortened to 2.5 hours.

The access road leads directly over the Narèt I dam to the north, at the other end of which there is also a small park area, where excellent hiking trails begin, such as the half-hour hike up to the Passo del Narèt or another two hours to the Christallina hut.

function

The Lago del Narèt is used by the Maggia power plants to store water that accumulates in summer from precipitation and snowmelt in the area, so that it can be used for energy production in winter. The direct catchment area of ​​the lake is 4.05 km². The lake is connected to Lago dei Cavagnöö by an underground pressure tunnel seven kilometers long , to which Lago Sfundau is also connected. These two lakes thus form an additional indirect catchment area of ​​6.02 km² for Lago del Narèt. In addition, water is pumped up into the lakes from the Robièi headquarters from the Lago di Robièi compensation basin . This center in turn processes the water from the three lakes.

A quantity of water can be stored in Lago del Narèt, from which 150 million kWh of electricity can be generated. The energy conversion takes place in the central Robièi, Bavona, Cavergno and Verbano until the water is transferred to Lake Maggiore . Because of the great gradient between the lake level at 2300  m above sea level. M. and Lake Maggiore at 193  m above sea level. M. measured by the content of the lake, a lot of energy can be obtained, which gives the lake an energy equivalent of 4.75 kWh per cubic meter of lake content .

Technical data of the dams

Naret I Naret II
Completion: 1969 1969
Lock type: Arch dam Gravity dam
Crown length: 435 m 260 m
Height: 80 m 45 m
Lock volume: 303,000 m³ 69,000 m³

Swell:

Web links

Commons : Lago del Narèt  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b c Geoserver of the Swiss Federal Administration ( information )
  2. ↑ a b c Andrea Baumer: Diga Narèt .
  3. ↑ Val Sambuco. In: alpi-ticinesi.ch. Retrieved June 13, 2020 .
  4. ↑ Fusio-Naret. Consorzi Stradali, accessed June 14, 2020 .
  5. ↑ From Lago del Naret. SAC, accessed on June 14, 2020 (Swiss Standard German).
  6. ↑ Ofima (ed.): Ofima, an exciting challenge . Operator's brochure. S. 117 ( ofima.ch [PDF]).
  7. ↑ List of barrages suisses. In: swissdams.ch. Swiss Dam Committee, accessed on June 14, 2020 .