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Christiani & Nielsen is saving Dwr Cymru Welsh Water close to œ1 million with its innovative installation of a 1,250m long outfall using an entirely land-based technique more commonly used in bridge construction.

The Thai-owned contractor is pushing the œ4.8million Lavernock Long Sea Outfall along a low-friction track, into a pre-dredged, 6m-deep sea trench in the Severn Estuary, using 350t capacity pushing jacks.

It is assembling the outfall in a clifftop yard at Lavernock by butt-welding 9m sections of pipe into twelve 100m long 'strings, each weighing 427t. These are then moved into position onton an adjacent pre-formed launchway ramp using two, 5t crab winches.