Dáil Éireann Debate, Tuesday - 4 March 2014
126. Deputy Catherine Murphy asked the Minister for Public Expenditure and Reform if the Office of Public Works is considering removing the large build-up of silt and vegetation in parts of the River Liffey to improve the capacity of the river during floods; if so, whether he will outline those plans; if not, whether he will give such a proposal consideration; and if he will make a statement on the matter. [10388/14]
View answerThe Office of Public Works does not have responsibility for the maintenance of the River Liffey. This is primarily a matter for the riparian owners.
The Office of Public Works (OPW) with its technical consultants, is currently undertaking the Catchment Flood Risk Assessment and Management (CFRAM) Programme, in partnership with local authorities and other stakeholders. This is a strategic approach that recognises the need, in line with international best practice, to move to a more sustainable, planned and risk-based approach to dealing with flooding problems.
The CFRAM Studies are comprehensive catchment-based studies through which, following public consultation, detailed flood maps are produced and flood risk management measures are assessed and taken to outline design. These measures will be prioritised and set out in a Flood Risk Management Plan. More information on the Programme is available on www.cfram.ie.
The River Liffey is being assessed as part of the Eastern CFRAM study and the main trunk of the river from Poulaphouca down to the sea, through Dublin City, is being modelled, including a number of tributaries. The areas of significant flood risk, described within the Programme as Areas for Further Assessment (AFAs, along the main trunk which are being assessed in detail are Newbridge, Clane, Celbridge, Leixlip, Lucan to Chapelizod, and Dublin. Under the study the flood maps are based on the conditions in the river as surveyed, and so include the existing river bed levels. Culverts, etc, are modelled as unblocked (ie clear of debris). As part of the study, it is intended to undertake a high level screening exercise to identify culverts at high potential risk of blockage by debris. If silting, debris or vegetation are determined to be contributory factors in increased flood risk on the river then this will be considered in the risk management plan produced under the CFRAM study. More information on the study is available on www.eastcframstudy.ie.
In addition, the ESB has a significant role in controlling water flows and potential flooding on the River Liffey as part of its management procedures for Poulaphouca Dam. The ESB is a member of the CFRAM Programme stakeholder group and any options for flood risk management arising from the Eastern CFRAM study will have to take account of ESB operational procedures.
