Water Services: Part 8 for Deansgrange Stream Flood Relief Scheme

Closed 14 Aug 2023

Opened 30 Jun 2023


This is a notice of proposed development by Dún Laoghaire Rathdown. We are looking for your observations and submissions.

Dún Laoghaire-Rathdown County Council are proposing a flood relief scheme along the Deansgrange Stream. The Deansgrange Stream has a history of fluvial flooding. A number of flood studies have been done on this stream. This proposed scheme is for a combination of measures to help protect property in the environs of the river and reduce the risk to the community.

The proposed scheme includes the following measures:

  • The relocation of an existing entrance at the southwest of Clonkeen Park to a location c.47m northwards along the boundary and associated works. The works include an extension of the Johnstown road off-road cycletrack northwards to the new entrance.
  • The replacement of 2 No. existing 1m dia. concrete pipes with a new 1.2m high x 3m wide concrete culvert, under Granville Road and associated works.
  • A new flood storage system with a total storage volume of approximately 9,615m3 including 2 detention basins, wetlands, embankments, flow control structure, pedestrian bridge, footpaths and landscaping within the existing greenspace at Glenavon Park.
  • Construction of c.240m of flood defence walls of up to 1.5m in height upstream of Killiney Hill Road bridge. Works include upgrading the upstream parapet of the bridge.
  • Installation of c.166m of concrete overflow pipe beginning upstream in the green area at Seafield Court crossing under the existing railway line (1.2m diameter) with a downstream section (1.8m diameter) through the amenity area east of the railway line, with a new outfall headwall to the existing Deansgrange stream.
  • Replacement of the existing debris screen and support walls and associated works at inlet to culvert between Seafield Court and Bayview housing estates.
  • Installation of a debris screen at the pedestrian bridge adjoining the Abberley estate and upstream of Killiney Hill Road.
  • Replacement of the debris screens and associated works at Shanganagh Road and at the Fish Pass in the environs of St. Columbanus National School.

The drawings for the scheme are available to view at the bottom of the page.

Why your views matter

The Council are seeking views from the public on the scheme. The period of consultation is from 30th June 2023 to 14th August 2023 inclusive.

Submissions and observations on the proposed development may be made as follows:

(a) DLR consultation online at citizen space - see below to fill out the survey

(b) by email to wsenquiries@dlrcoco.ie

(c) In writing and clearly marked Deansgrange Stream Flood Relief Scheme to:

Senior Engineer, Finance & Water Services Department,

Dún Laoghaire-Rathdown County Council,

County Hall, Marine Road, Dún Laoghaire, Co. Dublin

Post Code A96 K6C9

Drawings, full plans and particulars are also available for inspection at the following locations: 

  • Dún Laoghaire-Rathdown County Council, County Hall, Marine Road, Dún Laoghaire, Co Dublin, A96 K6C9 (Planning Counter Opening Hours: Monday to Friday 10 am- 4:00 pm, Sat and Sun Closed) 

  • Dún Laoghaire-Rathdown County Council, Dundrum Office Park, Main Street, Dundrum, 
    Dublin 14 (Opening Hours: Mon to Fri 9:30 am to 12:30 pm and 1:30 pm to 4:30 pm excluding Bank holidays)  

Data Protection Notice  

Any personal data supplied as part of this Public Consultation process shall be processed in accordance with the principles laid out in the General Data Protection Regulations (GDPR) and the Data Protection Act 2018. Personal data is any information that can identify a living individual. These laws exist to ensure that your data is managed safely and used responsibly. Any information, which you submit will be kept securely and will not be disclosed or shared with other parties (unless required by law or stated in our privacy policy).  

The information gathered will only be used for this purpose and will not be used for any other purposes. You can access the Council’s Data Privacy Statement here.  

Please note: pursuant to Article 83(2) of the Planning and Development Regulations 2001, as amended a copy of your submission or observation will be available for inspection or purchase by others. Please ensure that no vexatious, defamatory or confidential information, including confidential information relating to a third party (in respect of which the third party has not, expressly, or impliedly in the circumstances, consented to its disclosure) is included in your submission. 


  • All Areas


  • Anyone from any background


  • All Interests