Hochwasserschutz Dorf Alpthal - Vormassnahmen

The Bezirk Schwyz - Abteilung Umwelt in Switzerland from Europe region has released this tender for The flood protection project will be carried out in two separate lots: - Preliminary Measures Lot - Main Works Lot. This tender covers the work for the Preliminary Measures Lot. The Main Works Lot is not part of this tender. The work for the Preliminary Measures Lot includes the following measures: Geissbergbach: A new sediment trap will be constructed above Hochweidstrasse. The inlet area will be constructed with concrete blocks. The outlet structure will be a concrete wall with embedded steel beams (racks). Maintenance access to the sediment trap will be from Hochweidstrasse via a new access road with a gravel surface. The existing culvert at Hochweidstrasse will remain unchanged. Above the gravel trap, the channel will be widened to the required flood cross-section by means of a newly constructed basin structure with sills, consisting of 1.5 to 2.5-ton concrete blocks. The blocks in the banks will not be embedded in concrete. Further upstream, at the edge of the forest, a diversion dam will be constructed using terrain modification. Hochweidbach: Above Hochweidstrasse, the channel will be widened and the cross-sectional area enlarged to accommodate the water. In the steep upper section, the stream will be shaped into a basin structure using boulders and weirs. Mattlibach: In the upper reaches of the Mattlibach, a sediment trap with a new outlet structure will be constructed. The inlet area will be constructed with concrete blocks. The outlet structure will be designed using a screen and will connect to the existing culvert. Karlismattbach: Above the edge of the settlement at Haggeneggweg, a new sediment trap will be constructed. The inlet area will be constructed with concrete blocks. The outlet structure will be a concrete wall with embedded steel beams (screen). Prior to construction, utility and spring water lines will need to be relocated. Maintenance access to the sediment trap will be via a new access road with a gravel surface. Below the gravel trap, the channel will be widened to the required high-water cross-section by means of a newly constructed basin structure with sills, consisting of 1.5 to 2.5-ton concrete blocks. The blocks in the banks will not be encased in concrete. The small, existing gravel trap will remain unchanged. The detailed measures and precise boundaries are shown in the project plans. The individual construction sites are distributed across different sub-perimeters and are not contiguous. The intermediate transport of excavated material and topsoil will sometimes extend across construction sites, requiring the crossing of public roads and third-party properties/roads. with tender notice no. 715017-2026 published on 15 Oct 2026. The tender is due to expire on 13 Nov 2026. This tender is sourced from TED Europa and is eligible for suppliers interested in River regulation and flood control works, Flood-prevention works. Interested bidders can obtain further information including complete bid documents or ways to participate by registering on Tender Impulse and referencing via Tender Impulse ID 15574176.