Manufacture and installation of water-level gauge staffs on the Bocholter Aa

Summary

The contract covers the manufacture, supply and installation of water-level gauge staffs on the Bocholter Aa and nearby watercourses. The work includes gauges fixed to existing structures and riverbanks, their supporting structures and fastenings, surveying before and after installation, tying gauge zero points into the official height reference system, and final documentation. The technical specification states a total of 13 gauges: 10 attached to structures and 3 sloping gauges, with vertical extensions where needed to ensure readings during high water. The bill of quantities gives different, separately listed quantities: 11 structure-mounted gauges, 3 sloping gauges and 3 additional vertical gauges; bidders should verify the quantities against the tender documents. Some sites are in impounded water areas, with changing water levels and difficult access, and work from the water may be necessary. The work must be completed by 30 June 2027. Bids must be submitted electronically by 10:00 on 2 November 2026. Price is the sole award criterion; the procurement is not divided into lots and variant bids are not permitted. Bidders must submit the priced bill of quantities and required declarations and demonstrate suitability and relevant experience. The tender documents set out the exclusion grounds, qualification criteria and technical requirements.