Ova dal Gall

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Ova dal Gall
Acqua del Gallo
Data
location Italy
Lombardy
River system Danube
Drain over Spöl  → Inn  → Danube  → Black Sea
source from two streams at Passo di Fraele
46 ° 33 ′ 38 ″  N , 10 ° 14 ′ 46 ″  E
Source height approx.  1930  m slm
muzzle in the Lago di Livigno coordinates: 46 ° 37 ′ 23 "  N , 10 ° 11 ′ 37"  E ; CH1903:  810956  /  167 229 46 ° 37 '23 "  N , 10 ° 11' 37"  O
Mouth height 1805  m slm
Height difference approx. 125 m
Bottom slope approx. 26 ‰
length 4.9 km
Catchment area 76.7 km² (with part of the lake)
Left tributaries Torrente Val del Gallo, Torrente Valle Bruna
Right tributaries Aua da Val Mora

The Ova dal Gall (Italian: Acqua del Gallo ) is a 5 km long right tributary of the Spöl in the Italian province of Sondrio .

course

The Ova dal Gall ( Rhaeto-Romanic for Bach of the Gall Valley ) arises below the flat mountain passage Fraelepass ( Passo di Fraele ) by the confluence of the left source stream from the Valle del Gerun and the right source stream Torrente Val Paolaccia .

From several smaller valleys it takes in more streams, especially the Aua da Val Mora , which flows over the large Alp Sprella and through the Val Mora in the Grisons municipality of Val Müstair and reaches Italy at the Passo Val Mora path from Switzerland, where it flows to the Ova dal Gall after about 400 meters.

Between the mountain ranges at the Cima Paradiso in the west and the Cima del Serraglio in the east, the river now reaches Lake Livigno , while it used to be in the narrow and deeply deepened valley Val del Gallo (Galltal), below the Alpe dell Gallo and south of the Munt la Schera , to the Spöl flowed. In this section, the river once formed the border between Switzerland and Italy.

traffic

Immediately before the confluence of the Ova dal Gall into the Spöl there was an old bridge with the Rhaeto-Romanic name Punt dal Gall , located next to the agricultural area of Grasso del Gallo , until the middle of the 20th century . The valley path from Livigno, mentioned in 1807, led over the border bridge through the Spöltal (Rhaeto-Romanic Val dal Spöl ) into the Ofental .

Reservoir

In the State Treaty of May 27, 1957, Switzerland and Italy decided to use the water from the Spöl and Ova dal Gall , which should be collected in a reservoir, with a new hydropower plant. The narrow point in the valley where the Punt dal Gall bridge stood was chosen for the construction of the dam on the national border . That is why the 130 meter high dam, built between 1965 and 1968, was officially called the Punt dal Gall dam .

The eastern arm of the reservoir is about half as long as the entire Gall Valley.

From the Luwinersee (Italian: Lago del Gallo or Lago di Livigno ) the dammed water is led through a tunnel to the power station at Ova Spin in the Spölschlucht. The lake and the hydropower plant are part of the Engadine power plant .

Military infrastructure

At the junction of the valley at the Punt dal Gall there is a former blocking point of the Swiss Army in the defense area of ​​the former Border Brigade 12 .

Web links

Individual evidence

  1. ↑ a b c Reticolo Idrografico Regionale Unificato in the Geoportale della Lombardia
  2. ↑ Bacinizzazione 10 Kmq in the Portale Idrologico Geografico di ARPA Lombardia
  3. ↑ Geoserver of the Swiss Federal Administration ( information )
  4. ^ State treaty between Switzerland and Italy: Il concessionario dei due Stati contraenti costruirà, presso la confluenza dello Spöl e de l'Ova dal Gall, al di fuori del Parco nazionale svizzero, uno sbarramento capace di creare un invaso alla quota massima 1808 (IGM smm) la cui capacità utile sarà di circa 180 milioni di mc.
  5. ↑ Construction project of the dam