Table 2: Surface area of the works Work phases Surface in m² Phase 1 Pressure shaft 24.000 Phase 2: Upper water distribution pipeline together with the level surface of the pressure shaft 5.400 Phase 3: lower water distribution pipeline with surge tank 9.600 Phase 4: Cylindrical sluice-gate 400 Phase 5: Lindau-bypassing 1.500 Total surface 40.900