During 2006, it was proposed that the northern unused tunnels be used as a reservoir for irrigation water for The Domain and the Royal Botanic Gardens as part of a Clean Up Australia project to create a series of water reclamation and storage facilities. Clean Up Australia partnered with a number of groups in the attempt to move the project forward, and in 2007 obtained funding to proceed. Also in 2007, State Premier Morris Iemma announced plans to harvest rainwater at Parliament House. According to this plan all storm water from Parliament House, the State Library and Sydney Hospital (all on Macquarie Street) would be drained into the tunnels, treated, and then pumped back to storage tanks at the surface for use in non-potable water systems, saving an estimated each year.