Tenders Are Invited For River Regulation And Flood Control Works – 3. Rhone Correction - Priority Measure From Visp, Lot 6B Baltschiederbach - Master Builder Work

River Regulation And Flood Control Works – 3. Rhone Correction - Priority Measure From Visp, Lot 6B Baltschiederbach - Master Builder Work. Implementation Of The Hydraulic Engineering Measures Of Lot 6B Baltschiederbach And The Addition Of Lot 6A Of The Visp Priority Measure: From The Cantonal Road Bridge, The Channel Is Freed From The Concrete Shell And Widened On Average To Approx. 12 M. The Bank Wall On The Right Bank (Part Of The Stream Shell) Will Be Retained And Must Be Protected Against Scour. The Front Bank Shoring L = Approx. 100 M With Blocks Partly In The Rear Concrete Pushes The Baltschiederbach Away From The Bank Wall To The Widening On The Left Side. The Blocks In The Back Concrete In The Area Of ​​The Transition Are Intended To Direct The Flow Away From The Wall And Are To Be Made Rough. (Blocks Protrude From The Specified Embankment With Different Lengths). Parts Of The Concrete Bed As Well As The Left Bank Wall And The Dam Behind It Will Be Dismantled And The Baltschiederbach Will Be Widened On The Left Bank. The Material For The New Dam Will Be Obtained From The Existing Material From The Existing Dam And The Mouth Widening. Some Must Be Supplied From External Sources. In The Lower Area Of ​​The Embankment, The Bank Is Secured With A Set Of Blocks. In Addition, Bank Protection Is Ensured With Grouting And Engineering Biology. On The Water Side, The Core Dam Is Additionally Protected By Installing A Burrowing Protection System. Erosion Protection Mats Are Installed Above The Block Throw/Block Set. The Footpath On The Left Bank Is Created Along The Dam With A Natural Surface Layer Within The Water Area. In The Upper Part, The Bed Of The Channel Hardly Changes Compared To Its Current State, But The Concrete Shell Is Replaced By A Natural Bed. To Change From The Paved Bed Below The Cantonal Road Bridge To A Natural Bed, A Rough Bed Channel And A Scour Area / Ramp Base With Blocks Up To 3 M Deep Will Be Created In The Transition Zone. This Is Followed By A Dissolved Block Ramp With A Length Of Approx. 60 M, Followed By A Fish-Accessible Closed Block Ramp With A Low-Water Channel. On The Left Bank, The Stream Basin Will Be Dismantled Where Necessary And The Bank Protection Will Be Supplemented. Rebuilt To Suit The Terrain. Parts Of The Stream Basin Can Be Retained And Integrated Into The New Bank Structures. A New Dam Will Be Built On The Right Bank Outside The Current Course Of The Stream (Including Burrowing Protection On The Air And Water Sides As Well As Dam Foot Filters). The Dam Is Additionally Protected From Root Penetration Downstream With An Over-Profile. Similar To The Upper Section, The Existing Material From The Existing Dam And The Mouth Widening Will Be Used For The New Dam. In The Lower Part, The Bank Is Secured With A Block Set/Block Throw. In Addition, Bank Protection Is Ensured Using Engineering Biology. Erosion Protection Mats Are Installed Above The Block Throw/Block Set. A Cycle Path And Footpath With A Natural Surface Layer Will Be Created On The Top Of The Dam. In The Lowest Part The Channel Increases From 12 M To Approx. 45 M