Replacement of the Municipal Line II (SL 2) Mannenberg

Replacement of the water transmission line Wassertransportleitung ST DN600 CM/FCM CAT from Mannenberg Reservoir to Lutschenstrasse. The existing pipeline II was converted into a disharge line. The existing municipal line II in Badhausstrasse was extended by 60 m (ST DN500 CM/FCM), incl. construction of a new outlet structure (stilling well with stilling basin and valve chamber) as discharge into the River Worble. Using the ramming method with a ST DN1000 cladding tube it was possible to cross underneath Worblenstrasse and the RBS-rail track and the existing culverted Waldau Canal was crossed. In addition, a PE DN 120 cable conduit route was constructed between Mannenberg Reservoir and Chrüzweg pumping station for a signal cable incl. flushing. At the same time the water distribution lines were replaced in Ittigen and Bolligen.

Main Data

  • SL 2 ST DN600 CM/FCM: L=1,750 m
  • Outlet ST DN500: L= 60 m
  • Ramming ST DN1000: L= 22 m
  • Signal cable PE 132/120.0: L= 3,100 m
  • Flushing PE 140/114.6 S5: L= 60 m
  • Dimension of outlet structure: LxWxH= 4.90 x 4.30 x 2.55 m


ewb, WVRB AG, Municipality of Ittigen, Municipality of Bolligen


IUB Engineering Ltd in consortium

Construction period


Construction costs

CHF 5'550'000 (total)

Scope of services

Construction design, approval design, tendering, implementation project, construction supervision