Dublin City Council is to vote tonight on the proposed white-water rafting centre in the Docklands.
It would cost an estimated €22 million to convert the 19th-century dock between the IFSC and CHQ building into a mechanically-propelled rafting facility.
The proposals include a water polo pitch and an emergency service training centre at the site.
The dock was previously used to host Christmas markets and Oktoberfest.
The multi-million euro plan for the currently unused space was approved by councillors on the Central Area committee last month.
The proposed facility has been described as a "white elephant" by the last Lord Mayor Nial Ring.
But the current Lord Mayor Paul McAuliffe thinks it should get the go-ahead.
He said: " Ultimately the issue is here that there is a lot of money coming into this that couldn't be diverted elsewhere. We couldn't divert it to things we would like; like issues like housing and cycle lanes and so on."
The Lord Mayor said the question is a simple one.
He said: "If that funding is available for this project, does the north- east inner city deserve this project- and I think it does."