Dublin Castle Ireland (1800–1922). After the signing of the Anglo-Irish Treaty in December 1921, the complex was ceremonially handed over to the newly formed Provisional Government led by Michael Collins. It now hosts the inauguration of each President of Ireland, and various State receptions. The castle was built by the dark pool ("Dubh Linn") which gave Dublin its name. This pool lies on the lower course of the River Poddle before its confluence with the River Liffey; when the castle was built, the Liffey was much wider, and the castle was effectively defended by both rivers. The Poddle today runs under the
Dublin City Council scheme that many people favoured. The building was taken over for city government use in the 1850s. Dublin City Council published a plan in 2011 to supply water from Lough Derg on the River Shannon to Dublin city and region. In January 2014, Irish Water took over management of the River Shannon to Dublin pipeline project which is currently (2017) in the Planning Stage. Dublin City Council Dublin City Council () is the authority responsible for local government in the city of Dublin in Ireland. As a city council, it is governed by the Local Government Act 2001. Until 2001,