Open invitation to tender, deadline 01/06/2021, for the Thalwil relief tunnel (diameter 6.60 m, length 2014.15 m) to transfer flood peaks of the Sihl river into Lake Zurich and thus protecting the lower Sihl valley and Zurich from extreme floods (Lot 1). For further information on the tender click here (German/French) and here. Tenders must to be sent to Baudirektion Kanton Zürich, attn Mrs Aline Nguyen, Zurich, email aline.nguyen@bd.zh.ch. Contact Baudirektion Kanton Zürich, AWEL Amt für Abfall, Wasser, Energie und Luft, attn Hannes Zotter, Zurich, tel +41 43 259 55 85, email hannes.zotter@bd.zh.ch. Ref.n. 85W-745. 50/20.
