AlpTransit Gotthard Dam Safety Monitoring

Permanent monitoring of 3 dams and their surroundings since the construction of the Gotthard Base Tunnel

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Tunnel constructions are known to possibly activate rock dewaterings, resulting in potential surface subsidences. The 57 km long trace of the Gotthard Base Tunnel crosses the area of influence of three retaining lakes Curnera, Nalps and Sta. Maria in Southern Switzerland. Theoretical explorations have shown that the tunnel excavation results in surface subsidences up to 5 cm. To minimize the risk for the dams, an extensive monitoring system has been installed, which surveys all the year round the dams and their surroundings for changes at the scale of millimeters. The surveillance requires a high weather resistance of the instruments and all other installations. The project has been realized by an association of BSF Swissphoto, Grünenfelder und Partner and Amberg Technologies.

The monitoring systems at the Nalps and Sta. Maria dams (2 total stations each) were taken over by the dam owner and operator, Axpo AG, from AlpTransit Gotthard Ltd. in 2016.

The operation of the total stations will continue to be guaranteed by BSF Swissphoto. In the summer of 2020, these monitoring installations celebrated their 20th anniversary - probably the longest permanently operational total station monitoring project in the world!

Our services

  • Fully-automated and continious monitoring of dam cross sections of 3 dams and 4 valley cross section
  • Elevation surveillance by means of GPS technology at 10 exposed locations in alpine area
  • Rock mechanics measurements
  • Yearly high precision levelling (approx. 100 km) along roads and through the pressure pipe galleries between the three dams
  • Independent and interruption-free electrical power supply by means of solar panels and lightning protection
  • Permanent data communication via radio and GSM

SwiMo - Berlin Hauptbahnhof

Monitoring the construction of S21 at Berlin main station

Berlin, Germany
Deutsche Bahn AG
2015 - 2025
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SwiMo - Bhf Wthur Personenunterführung

Winterthur main station, Monitoring construction of pedestrian underpass

Winterthur, Switzerland
STRABAG AG, Schlieren
2018 - 2020
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SwiMo - Inselspital BB12

Monitoring new building Inselspital BB12, Bern

Bern, Switzerland
Inselspital, Infrastructure Directorate
2017 - 2020
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SwiMo - Zermatt Bergbahnen

Monitoring mountain railways Zermatt

Zermatt, Switzerland
Zermatt Bergbahnen AG
2018 - ...
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SwiMo - Hotel Palace Luzern

Monitoring Rebuilding Hotel Palace, Luzern

Luzern, Switzerland
Civil Engineer: Itten + Brechbühl, Zürich
2018 - 2020
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SwiMo - Gubrist 3. Röhre

Monitoring at new Gubrist tunnel

Zürich, Switzerland
Federal Roads Office (FEDRO)
2016 - 2021
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SwiMo - Bern Wylerfeld

Reconstruction of rail track intersection Wylerfeld, Berne

Berne, Switzerland
Swiss Federal Railway
2015 - 2021
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SwiMo - NAGRA GPS-Monitoring

NaGNet GPS-Monitoring

North of Switzerland & South-Germany
NAGRA, Switzerland
2010 - 2024
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SwiMo - Bern Murtenstrasse

Railway track and excavation pit monitoring Murtenstrasse Bern

Bern, Switzerland
Gross Generalunternehmung AG
2016 - 2019
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SwiMo - GNSS Moosfluh

GNSS Monitoring Ropeway Moosfluh

Riederalp, Switzerland
Aletsch Bahnen/PLANAX AG
2015 - ...
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SwiMo - AlpTransit Staumauermonitoring

AlpTransit Gotthard Dam Safety Monitoring

Gotthard region, Switzerland
AlpTransit Gotthard AG & Axpo AG
2000 - ...
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SwiMo - Dortmund Hauptbahnhof

Railway track monitoring Dortmund main station

Dortmund, Germany
Civil engineering department of Dortmund
2014 - 2017
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All references
SwiMo - Berlin Hauptbahnhof

Monitoring the construction of S21 at Berlin main station

Berlin, Germany
Deutsche Bahn AG
2015 - 2025
Learn more
SwiMo - Bhf Wthur Personenunterführung

Winterthur main station, Monitoring construction of pedestrian underpass

Winterthur, Switzerland
STRABAG AG, Schlieren
2018 - 2020
Learn more
SwiMo - Inselspital BB12

Monitoring new building Inselspital BB12, Bern

Bern, Switzerland
Inselspital, Infrastructure Directorate
2017 - 2020
Learn more
SwiMo - Zermatt Bergbahnen

Monitoring mountain railways Zermatt

Zermatt, Switzerland
Zermatt Bergbahnen AG
2018 - ...
Learn more
SwiMo - Hotel Palace Luzern

Monitoring Rebuilding Hotel Palace, Luzern

Luzern, Switzerland
Civil Engineer: Itten + Brechbühl, Zürich
2018 - 2020
Learn more
SwiMo - Gubrist 3. Röhre

Monitoring at new Gubrist tunnel

Zürich, Switzerland
Federal Roads Office (FEDRO)
2016 - 2021
Learn more