Table 1: Schedule of work

Empty the upper basin, pressure shaft and upper water distribution pipeline 2 April 2008 – 10 April 2008
Empty the lower water tunnel and lower water distribution pipeline 14 April 2008 to 18 April 2008
Anti-corrosion works in the pressure shaft Mid July 2008 – 3 March 2009
Anti-corrosion works in the upper water distribution pipeline May 2008 to July 2008
Anti-corrosion works in the lower water distribution pipeline May 2008 to January 2009
Anti-corrosion works on the cylindrical sluice-gate including constructional mechanical repairs September 2008 to November 2008
Anti-corrosion works Lindau – bypassing October 2008 to December 2008
Filling the lower water tunnel and distribution pipeline January 2009
Filling the pressure shaft 17 March 2009 to 26 March 2009
Back into operation 16 March 2009 to 6 April 2009