Susasca

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Susasca
The Susasca flows into the Inn with a view of the Flüelapass

The Susasca flows into the Inn with a view of the Flüelapass

Data
Water code CH : 5281
location Canton of Graubünden ; Switzerland
River system Rhine
Drain over Inn  → Danube  → Black Sea
Headwaters below the Flüela pass
46 ° 44 ′ 47 ″  N , 9 ° 57 ′ 10 ″  E
Source height 2359  m above sea level M.
muzzle near Susch in the Inn Coordinates: 46 ° 44 '59 "  N , 10 ° 4' 49"  E ; CH1903:  801806  /  181018 46 ° 44 '59 "  N , 10 ° 4' 49"  O
Mouth height 1417  m above sea level M.
Height difference 942 m
Bottom slope 83 ‰
length 11.4 km
Catchment area 63.14 km²
Discharge  at the mouth of the
A Eo : 63.14 km² 		MQ
Mq
 		2.14 m³ / s
33.9 l / (s km²)
Left tributaries Aua da Fless
Right tributaries Ova da Radönt, Aua da Grialetsch
Communities Zernez

The Susasca is an approximately 11 km long left tributary of the Inn in the Swiss canton of Graubünden . It drains the Lower Engadine side valley Val Susasca in the municipality of Zernez , which is accessed by the Flüelapassstrasse and its secondary valleys, including Val Grialetsch and Val Fless , an area of ​​around 63 square kilometers.

geography

course

The Susasca rises at around 2360  m above sea level. M. a larger spring a little below the Flüela Pass and the Lai Nair (Schwarzsee).

It initially flows east-southeast through a field of scree with many springs. After passing the striking Schwarzchopf ( 2603  m above sea level ), you reach the Chant Sura area with the flat moor of the same name . In this it first takes in the Ova da Radönt from the right , which rises below the Radüner Rothorn , and only shortly afterwards from the left the stream from the Val Tantermozza , which rises on Piz Champatsch . After flowing through the fen it is bridged by the Flüelapass road and then plunges to the timber line in a plurality of cascade the section of the valley to the Val Susasca down.

At Alp d'Immez , it reaches the bottom of the Val Susasca, which is a continuation of the Val Grialetsch . From this, the longer and richer Aua da Grialetsch , which rises from the Grialetsch glacier, flows to the right. The Susasca now runs to the northeast through the largely forested valley with individual scree fields. A little below is Alp Pra Dadoura , where the Aua da Fless joins from the left , which rises on Piz Fless . Shortly afterwards at Chant Blau it forms a broad alluvial fan over a length of around 500 meters , which is protected as a floodplain area of ​​national importance under the name Blaisch dal Piz dal Ras . After a small power station near Jenna , about 2 kilometers downstream at Punt Pignai, there is another smaller alluvial fan that serves as debris retention and has a retention volume of around 8000 m³.

After another bridge on the Flüelapassstrasse, further cascades follow, after which the Susasca reaches the Lower Engadine. Here it first passes the bed load collector Mundaditsch before it flows through Susch, which is protected by walls. Here it is first bridged by the Bever-Scuol-Tarasp railway line and then immediately afterwards by Hauptstrasse 27 and Hauptstrasse 28 .

Finally the Susasca flows out at 1417  m above sea level. M. directly at the Clinica Holistica Engiadina from the left into the Inn.

Catchment area

Susasca below the Flüela Pass

The catchment area of ​​the Susasca measures 63.14 square kilometers, of which 58.5% is unproductive area , 23.1% agricultural area, 8.8% glaciers and firne, 8.5% forested area , 0.6% water area and 1% settlement area .

The highest point is at 3204  m above sea level. M. a little below the Piz Vadret on its northern slope, the mean height is 2467  m above sea level. M. and the lowest point is at the mouth at 1417  m above sea level. M.

The mean discharge at the mouth is 2.14 m³ / s, with a maximum in June of 6.3 m³ / s and a minimum in January and February of 0.4 m³ / s. The higher runoff in summer is due to the snowmelt.

power plant

At Jenna , the Susasca hydropower plant went into operation in 2010, which initially produced 17.2 GWh of electricity annually with a four-nozzle Pelton turbine . In addition, a fish ladder was installed next to the structure . The construction costs amounted to 20 million Swiss francs. In 2015, an identical turbine was upgraded and the expansion water volume increased from 1 m³ / s to 2 m³ / s, which means that 24.9 GWh of electricity can now be produced annually.

Web links

Commons : Susasca  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c Geoserver of the Swiss Federal Administration ( information )
  2. ↑ a b c Topographical catchment areas of Swiss waters: sub-catchment areas 2 km². Retrieved August 3, 2018 .
  3. ^ Community of Susch, Lower Engadine. (PDF) Susasca - sediment collector, construction of the lower reaches. In: Davos Engineers AG. Retrieved June 18, 2019 .
  4. ↑ Susasca power station. (PDF) In: zek specialist publisher for future energy + municipal technology. Retrieved June 18, 2019 .
  5. ^ Hydro-Solar Water Engineering AG: KW Susasca, Susch.
  6. ↑ KW Susasca reaches the second expansion stage. (PDF) In: zek specialist publisher for future energy + municipal technology. Retrieved June 18, 2019 .