The floating Riverwalk is set to be replaced, but not in the form that saw part of its previous incarnation float away at the height of January's flood.

Instead, a federal and state-funded $70 million fixed Riverwalk, which will not rise and fall with the tide, will be built in its place.

The design chosen for the new Riverwalk.

Lord Mayor Graham Quirk said the new structure would be built above the Brisbane River, from the Howard Smith Wharves to New Farm, and would be wider than the original floating five-metre-wide floating structure.

"It will be built to six metres in width, one metre wider than the original Riverwalk to make it easier for the cyclists and the pedestrians," he said.