1. To the Lord Mayor and Report No. 368/2011
Members of Dublin City Council Report of the Assistant City Manager
Clontarf Flood Defence Project
Final Report to Dublin City Council Meeting 5th December 2011
1. Introduction
An interim Report on the Clontarf Flood defence project incorporating the North City Arterial
Water main (Report number 315/2011) and an accompanying presentation was made to the
Dublin City Council Meeting on 7th November 2011.
That interim report confirmed that:
Coastal Flooding presents a serious risk for the people in Clontarf.
This project is about protecting people – their lives, homes and livelihoods.
At present, Clontarf is one of the most vulnerable areas of the City and is at risk of
severe flooding from the sea.
If nothing is done to prevent it, a flood may cause major damage to the area,
disrupting business and daily life and possible injury or even loss of life.
Dublin City Council is working to prevent that.
The modified proposal outlined in detail to the City Council in November is
landscaped gentle grass mounding and some sea walls where mounding is not
possible at four existing car parks.
Many solutions were examined for this project but the modified proposal provided for
the best balance between providing adequate protection for the community and
conserving the amenity value of the area.

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Determining a solution to flooding is about striking a balance between these two competing
priorities and in adjusting the scheme, Dublin City Council has rebalanced the proposal to
take better account of the amenity value of the area, while at the same time providing
essential flood defence.
2. Debate at City Council meeting on 7th November
A full discussion and debate took place at the meeting of the City Council in November.
During that meeting the following motion was passed by the City Council:
“That this Council rejects the original Clontarf Flood Defence Plan and respects the right of
the people of Clontarf to accept or reject the proposed revisions as outlined at the November
City Council meeting. This Council further demands that following the information sessions
planned by the City Council over the next month concerning the revised plans and feedback
to local representatives, that a vote be taken on the final report at the December City Council
meeting to determine whether or not to proceed with the revised plan and no contracts will
be signed in advance of the vote taking place”
The City Manager informed the City Council that:
A series of Public Information sessions would be held to allow individuals examine
the proposals and to make observations up to a closing date of 28th November 2011.
A report would be issued to the Council Meeting in December following the
information sessions including feedback from the information sessions and
addressing funding and planning for the modified proposal.
The City Manager confirmed that he would act in accordance with the decision of the City
Council on the flood defence project.
3. Actions from 7th November 2011 to date.
The Public Information Sessions were held in Clontarf Castle Hotel on the evenings of 16th,
17th, and 23rd November and on Saturday 19th November 2011. Public notices were placed
in the national press giving details of the information sessions. A leaflet drop was carried out
in the area and all of the houses and properties identified as being at risk of coastal flooding
were included in the leaflet drop. Additional notices advertising the information sessions
were placed in local businesses.
A full report on these sessions and the feedback received is contained in Appendix 1 and
Appendix 3.
In parallel with the above Public Information sessions, the Clontarf Residents’ Association
and Clontarf Business Association held separate briefing sessions and made presentations
on potential alternative options (not developed to detailed design stage) that had been
included in the original 2005 Dublin Coastal Flood Protection Project Report drawn up by
Dublin City Council Consultants Royal Haskoning.

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4. Defending Clontarf from Coastal Flooding
4.1 Clontarf Flood Risk
The coastal flood risk maps prepared as part of the Coastal zone risk assessment study are
in compliance with National Guidelines and they show the area that will flood if a 1 in 200
year coastal flood event occurs (which has a 0.5% probability of occurring in any one year).
The areas indicated to be at risk are also shown in the recently published draft maps
prepared by the OPW as part of their Preliminary Flood Risk Assessments (July 2011).
Coastal Flood Risk in Dublin Bay has been analysed in great detail and is well understood.
Major floods, such as occurred in 2002, arise when a number of separate risk factors all
occur at the same time. It is not possible to predict when all of these factors will coincide in
the future but there is a very high risk that, at some time in the future, a significant coastal
flooding event will strike Clontarf sea front and, if the area remains undefended, this will
result in serious flooding of residential properties and businesses.
Coastal flooding occurred in 1982, 2002 and was narrowly avoided in 2010 when the tidal
surge arrived just 4 hours after high tide. The proposed coastal defence scheme is designed
to mitigate this risk.
4.2 Proposed modified Scheme
The modified scheme was outlined at the November City Council meeting and at the public
information sessions. In response to residents’ concerns, Dublin City Council is proposing
under the modified scheme to reduce the heights of proposed flood defences at Clontarf, so
that many of the views that would have been interfered with would be restored.
The modified flood defence solution, recommended by the Consultants, consists mainly of
landscaped grass mounds to keep the sea at Clontarf at bay. Where grass mounds would
not work, due to existing car parks at four locations, (Hollybrook Road, Clontarf Baths,
Vernon Ave and The Yacht Club/Dublin Bus car park) sea walls would be provided.
83% of the flood defences would be below 1.524 metres (5ft) and largely consists of
landscaped grass mounds to maintain uninterrupted pedestrian access to the sea
front.
The seafront pathway would be a well-lit, open and safe place for families, walkers
and joggers after the flood defence is built.
The gradient of both the mounds and the pathway would allow people to walk across
the mounds with ease and the paths would be fully accessible to all

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4.3 Clontarf Residents’ Association and Clontarf Business Association separate
briefing sessions
During the Dublin City Council Public Information sessions, as outlined above, the Clontarf
Residents’ Association and the Clontarf Business Association (CRA/CBA) also set up and
advertised parallel Public Information sessions.
At these, the CRA/CBA presented photomontages of their interpretation of some of the
options that had been included in the original 2005 Dublin Coastal Flood Protection Project
(DCFPP) Report produced for Dublin City Council by consulting engineers Royal Haskoning.
In particular they focused on what was referred to as Option 1 – which was an option to raise
the existing sea wall and the nearby promenade.
In their presentations to the public the CRA/CBA used the indicative levels and indicative
concepts in the 2005 Report, taking no account of the fact that these were never developed
beyond outline design stage.
The result was that people attending the CRA/CBA presentation were told that Option
1 consisted of raising the existing sea wall by “three to four feet” (900mm to 1.2m).
No account was taken of the significant variation in the existing ground or sea wall levels.
This was then held up in comparison with Dublin City Council’s modified proposal which
consisted of proposed defences which are generally no higher than 1.4m (4 feet 7 inches)
but, in order to be effective, do have to rise to a maximum height of 2.1m (7 feet) where the
existing ground levels are very low near Oulton Road.
Those attending the public information sessions were, understandably, impressed with the
CRA/CBA interpretation of Option 1 and compared this most unfavourably with the DCC
modified proposals.
This is despite the fact that, in reality, if Option 1 were to be adopted and take full account of
the wave modelling and detailed design to which the DCC proposals were subjected, the
height of this Option would be higher than the DCC option.
This fact was also pointed out in Sect 2.1 of the previous Interim Report to the City
Council on 7th November 2011.
Furthermore, Option 1 was also predicated in the DCFPP Report on the construction of
groynes or breakwaters on the seaward side of the existing wall. This would have had to
take place within a Natura 2000 designated site. Without these groynes, the proposed
Option 1 wall would be even higher again.
Dublin City Council officials approached the CRA/CBA and expressed concern that their
presentations may give the wrong impression to those attending, and offered to have Dublin

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City expert flood defence consultants Haskoning meet with the CRA/CBA team to explain
this. However, this offer was rejected (See Appendix 2). We were subsequently advised that
this offer was interpreted as an attempt by the Council to ridicule the work of the CRA/CBA.
All alternatives set out in the 2005 Report and other variations on these were considered
fully at the outset of this project in 2005.
Any option that is to provide an effective flood defence must consist of some form of physical
barrier between the Clontarf Road and the sea. Such a barrier must be located at the sea
wall, in the existing promenade or at the existing cycle track and any such barrier will be at
least as high, if not higher, than the current proposals.
Consultants Haskonings have considered the potential options presented by the CRA/CBA
at their separate public information sessions and statements that a “three or four feet
increase in existing sea wall” would be sufficient to protect Clontarf. They met with
Councillors on 24th November 2011 and confirmed that:
Any effective flood defence constructed along the line of the existing sea wall will be
between 400mm and 800mm higher than the height of the current proposed mound
at the equivalent location along the promenade, with consequent impact on sea
views etc.
Wave heights are bigger at that point whereas an inland barrier takes advantage of
the waves breaking on the existing sea wall first and consequently is lower.
Furthermore, if the promenade is to be raised accordingly, the promenade will now
fall towards the road (quite dramatically in places) resulting in increased risks if the
sea wall were overtopped.
The cost could be of the order of four times the cost of the current scheme (that
would put it at €12m excluding design etc. and well beyond any cost benefit ratio.
There is no option which involves raising the sea wall by “three or four feet” as confirmed by
experts Haskoning (as set out in appendix 4) nor any other option likely to be more
favourably received.
It is essential that City Council are aware of this expert advice when considering whether to
accept or recommend rejection of current modified proposal.
5. Feedback from Public Information sessions to Current Proposals
Appendix 3 provides a more comprehensive analysis of the issues that have been raised by
those who attended the Public Information sessions and those who contacted Dublin City
Council directly. The information sessions were attended by over 2,000 people. Publicity in

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some media portraying the recommended scheme as a 10 feet high wall stretching along the
3 Km. of coast (which was never the case), was most unhelpful and contributed to polarising
opinion against the defence scheme.
A substantive issue is that the current proposal will “split” the promenade and could result in
a security and safety risk to those using the area beside the sea and that they would not be
visible from the rest of the promenade or from the road.
A related issue is the impact of the proposed mounding on the amenity value and enjoyment
of the promenade.
One issue that has caused great difficulty to this project’s chances of being accepted is the
fact that the existing ground levels vary quite significantly over the 3km length. In particular
there is an area directly east of the Clontarf Baths near Oulton Road where, due to the very
low ground levels, any proposed coastal flood defence structure, regardless of what option is
adopted, will have to be at least 2m high at this point.
If the overall area stretching to 3km is to be protected from the sea some form of barrier is
required. The barrier must run the full 3km identified at risk of coastal flooding. The height of
the proposed barrier has been designed by International Consultants. There is little point in
flood defences if they are so low that they are not going to prevent the sea from flooding
houses and properties.
6. Funding, Planning and Procurement Issues
Funding – All schemes identified as requiring funding from Central Government must be
designed to meet coastal defence guidelines and must also pass cost benefit requirements.
Funding for this scheme is included in the 2011 OPW budget and can be drawn down if a
contract is signed in 2011 for works to begin construction in 2012. At this stage, even if the
Council agree to proceeding with the project, it is likely the further planning process (see
below) will extend into next year. This being the case we would argue for the funding to be
deferred until next year.
Planning - If it is decided to proceed with a modified design, as outlined to the City Council
at the November meeting, based on the concept approved by An Bord Pleanala in 2008, it
will require a resubmission to An Bord Pleanala. There is scope in the legislation to have
such an amendment dealt with by An Bord Pleanala under current legislation without a full
resubmission of an EIS particularly if recommended by Dublin City Council.
In parallel, other issues, such as the requirement for a new Appropriate Assessment, could
be addressed. It is likely that a formal screening process would be required and based on
the extent of the assessment carried out already under the EIS process, this screening
process could be done in parallel with a revised submission to An Bord Pleanala.

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Procurement of Contractor – A tender process has been completed and a contractor has
been recommended to be appointed subject to the normal approvals process. This
procurement would allow construction in 2012 subject to approval of the planning
submission by An Bord Pleanala and completion of the Appropriate Assessment of the
modified proposal. In effect, if it is decided to proceed with an amended flood defence
project the existing procurement will stand.
If it is decided not to proceed with the modified flood defence project the current
procurement process (including the watermain procurement) will also be terminated. While
the intention, in this scenario, is to proceed with the watermain project the revised contract
would require a new tender process. The new procurement could take up to a year.
The process of getting any new flood defence project underway would be dependent on
Dublin City Council being provided the necessary dedicated funding to recruit a project team,
following which the previously set out (and lengthy) project process would get underway.
7. Communications
As advised at the November Meeting all statutory processes were completed in relation to
the original proposal and notification was given to the relevant parties (see correspondence
attached in Appendix 5). We have accepted that while the Council did comply with the
statutory requirements, notified Residents Associations and held information sessions there
could have been a far more collaborative process with the Residents and Business
Associations but not all of the responsibility for failure to fully engage with the process lies
with the Council alone. As late as January 2011 the Clontarf Residents Association
confirmed that “DCC has spent years planning the flood defence scheme for the area and
that it has been scrutinised and passed by An Bord Pleanala. It does not interfere with the
proposed SPA and it should not be altered”
8. Recommendation
I have noted that public opinion in the Clontarf area is virtually wholly opposed to the
modified Flood Defence Project going ahead. But in making my recommendation a number
of factors have been taken into account. Both the OPW and our Consultants agree that the
modified proposal provides an effective flood defence for the area at risk in Clontarf. The
OPW are willing to approve the modified proposal although it is noted that we have no
guarantee of funding beyond 2011 at this point. It is possible to proceed to construction in
2012 (subject to funding and resolution of the outstanding planning matters). I am also taking
on board the advice of our Consultants that any option involving modification of the sea wall
would be significantly higher than the modified proposal and would face similar objections.
All alternative suggestions for flood defences raised during the information sessions have
been commented on in the report from our expert Consultants (see appendix 4). There are
therefore no other alternative options which can protect Clontarf and which would be
acceptable to people based on feedback from the information sessions.

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For these reasons and given the overriding requirement to protect the area I am of the view
that the amended proposal is the only feasible option that can be achieved in the short to
medium term.
It has been clearly represented to us by many of the Elected Members that both the EIS
approved project and the more recently modified proposal are not acceptable for a number
of reasons including the security and amenity issues. It is within the rights of the members to
prevent the flood defence proposal going ahead.
If this is the decision then officials of the City Council will seek to meet with the Residents
Association and the Business Association in order to consider the outcome and implications
of the decision.
Seamus Lyons
Assistant City Manager
Attachments:
Appendix 1 – Report on Public Consultation
Appendix 2 – Correspondence relating to potential impact of raising sea wall as outlined in Clontarf
Residents’ Association and Clontarf Business Association separate briefing sessions
Appendix 3 Analysis of issues raised during Dublin City Council Public Information sessions.
Appendix 4 – Report by Expert Flood Consultants Haskonings on modified Scheme and all potential
alternatives following feedback from Public Information sessions.
Appendix 5 Correspondence regarding EIS Process and Planning Report.

9. Appendix 1 - Report on Public Consulation

15. Open Day Displays

25. Project Information Brouchure

30. Open Day Leaflet

32. Press Release

35. Appendix 2 - Correspondence relating to potential impact of raising sea wall as outlined
in Clontarf Residents' Association and Clontarf Business Assocation seperate briefing sessions

43. Appendix 3 - Analysis of issues raised during Dublin City Council Public Information Sessions

53. Appendix 4 - Report by Expert Flood Consultant Haskonings on modified Scheme and
all potential alternatives following feedback from Public Information Sessions

68. Appendix 5 - Notice regarding EIS Process