5423 General construction services of harbours, waterways, dams, water mains and lines, irrigation and other waterworks

**Includes:** - construction, repair, alteration and restoration services for: • aqueducts, water conduits and similar waterways designed to convey water for the purpose of water supply, except pipelines **Excludes:** - construction services of waterworks for irrigation or flood control, cf. 54234 - construction services of long-distance pipelines, cf. 54241 - construction services of local water mains, cf. 54251

**Includes:** - construction, repair, alteration and restoration services for: • harbour bottoms and harbour channels, breakwaters, quays, piers, jetties, docks, wharves and similar structures • riverworks and canal construction for water transport traffic • locks, floodgates, sluices, lifts, dry docks, slipways, barrages and other hydromechanical structures - dredging services, rock and silt removal and other water-associated construction services - underwater work (by divers, frogmen or other techniques) and various hydraulic engineering services **Excludes:** - laying of submarine cables, cf. 54242 - pile driving services, cf. 54511

**Includes:** - construction, repair, alteration and restoration services for: • dams and similar water-retaining structures • embankments for coastal and other waterside areas

**Includes:** - construction, repair, alteration and restoration services for irrigation and flood control waterworks **Excludes:** - construction services for waterways for the purpose of water supply, cf. 54231