Dublin City Council

River Dodder Flood Alleviation

Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00

Issue 3 | 10 July 2018

This report takes into account the particular

instructions and requirements of our client.

It is not intended for and should not be relied

upon by any third party and no responsibility

is undertaken to any third party.

Job number 219346-80

Ove Arup & Partners Ireland Ltd

Arup

50 Ringsend Road

Dublin 4

D04 T6X0

Ireland

www.arup.com

219346-00 | Issue 3 | 10 July 2018 | Arup

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Job title River Dodder Flood Alleviation Works 2D – RDS

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Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Contents Page

1 Introduction 1

1.1 Introduction 1

1.2 Methodology 2

1.3 Layout of Report 3

1.4 Legislative Background 4

2 Overview of the Proposed Development and the Receiving Environment 6

2.1 Introduction 6

2.2 Need for the Proposed Development 6

2.3 Site Description and Overview of Proposed Development 7

2.4 Description of the Proposed Development 10

2.5 Operation Elements 15

3 Ecological Overview 16

3.1 Site Baseline 16

3.2 Zone of Influence 16

3.3 Natura 2000 Sites 17

3.4 Other Designated Sites 28

3.5 Rare and Protected Species 31

3.6 Fisheries 31

4 Cumulative Impacts with other Projects 32

5 Assessment of Significance 33

6 Conclusions 35

Appendices

Appendix A

Engineering Drawings

Appendix B

Photographs

Appendix C

Finding of No Significant Effects Report

Appendix D

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

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Ecological Survey Report

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Report for Screening for Appropriate Assessment

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Page 1

1 Introduction

1.1 Introduction

This report contains information required for the competent authority to undertake

screening for Appropriate Assessment (AA) for the proposed construction of a

new reinforced concrete L-wall along a section of the River Dodder in

Ballsbridge, Dublin City (hereafter referred to as the “proposed development”).

The proposed development forms part of the Dodder Flood Alleviation Works

Phase 2D design. Refer to Appendix A for the engineering drawings.

The aims of this report are to:

Provide information on, and assess the potential for the proposed development

to significantly impact on Natura 2000 Sites (also known as European sites);

Determine whether the project is directly connected with, or necessary to, the

conservation management of any Natura 2000 sites; and

Determine whether the project, alone or in combination with other projects, is

likely to have significant effects on Natura 2000 sites in view of their

conservation objectives.

Figure 1 below show the approximate location of the proposed development.

This report for screening for AA was undertaken by an Arup ecologist on behalf

of Dublin City Council.

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Figure 1: Location of the proposed development. Source Bing Maps | Not to scale.

1.2 Methodology

1.2.1 Guidance and Data Sources

This report has been prepared with regard to the following guidance documents,

where relevant:

Managing Natura 2000 Sites: The Provision of Article 6 of the Habitats

Directive 92/43/EEC (EC Environment Directorate-General, 2000); [hereafter

referred to as MN 2000];

Assessment of Plans and Projects Significantly Affecting Natura 2000 sites:

Methodical Guidance on the Provisions of Article 6(3) and (4) of the Habitats

Directive 92/43/EEC (European Commission Environment Directorate-

General, 2001);

Guidance Document on Article 6(4) of the Habitats Directive 92/43/EEC.

(European Commission, 2007);

Appropriate Assessment of Plans and Projects in Ireland - Guidance for

Planning Authorities (Department of Environment, Heritage and Local

Government, 2010 revision);

Appropriate Assessment under Article 6 of the Habitats Directive: Guidance

for Planning Authorities. Circular NPW 1/10 and PSSP 2/10;

Guidelines for Good Practice Appropriate Assessment of Plans under Article

6(3) Habitats Directive (International Workshop on Assessment of Plans

under the Habitats Directive, 2011); and

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Sources of information that were used to collect data on the Natura 2000 network

of sites and on the existing ecological environment are listed below:

Bing aerial photography;

National Parks and Wildlife Service online data on European Sites and (www.npws.ie) (downloaded on 10 May 2018);

National Parks and Wildlife Service online data on protected flora and fauna (viewed on 10 May 2018);

Information on environmental quality data available from www.epa.ie (EPA Online Environmental Map Viewer) (viewed on 10 May 2018);

Information on environmental water quality data available from (EPA, www.catchments.ie);

Dublin City Development Plan 2016-2022;

Dublin City Development Plan 2016-2022 Appropriate Assessment Screening Report;

Dublin City Biodiversity Action Plan 2015-2020;

Dodder Greenway Ecological Impact Assessment (June 2017) Roughan & O’Donovan Consulting Engineers for South Dublin County Council.

Guidance that has assisted in determining whether impacts are likely to be

significant include:

Guidelines on the Information to be Contained in Environmental Impact Statements (Environmental Protection Agency, 2002);

Revised Guidelines on the Information to be contained in Environmental Impact Assessment Reports (Draft EPA August 2017);

Advice Notes on Current Practice (in the preparation of Environmental Impact Statements) (EPA, 2003);

Draft Advice Notes for preparing Environmental Impact Statements (EPA September 2015) and;

Guidelines for Ecological Impact Assessment in the Britain and Ireland, Marine and Coastal (Institute of Ecology and Environmental Assessment, 2010).

1.3 Layout of Report

This report contains information required for the competent authority, to

undertake screening for Appropriate Assessment (AA) for the proposed

development at Ballsbridge, Dublin City. This report is based on a desk study and

an ecological survey.

The screening information presented in this report is as follows:

Legislative Background, refer to Section 1.4;

Overview of the proposed development and receiving environment, refer to Section 2;

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Ecological Overview and Identification of relevant Natura 2000 sites (European sites) within the zone of influence of the proposed development, refer to Section 3;

Assessment of likely significant effects on Natura 2000 Sites, refer to Section 3.3; and

Conclusions, refer to Section 6.

1.4 Legislative Background

According to the EU Habitats Directive (92/43/EEC) and the EU Birds Directive

(79/409/EEC), Member States are required to establish a Natura 2000 network of

sites of highest biodiversity importance for rare and threatened habitats and

species across the EU. In Ireland, the Natura 2000 network of European sites

includes Special Areas of Conservation (SACs) and Special Protection Areas

(SPAs).

SACs are selected for the conservation of Annex I habitats (including priority

types which are in danger of disappearance) and Annex II species (other than

birds). SPAs are selected for the conservation of Annex I birds and all migratory

birds and their habitats. The Annex habitats and species, for which each site is

selected, are the qualifying interests (QI) of the site. Conservation objectives for

the site are defined for these qualifying interests.

A key requirement of the Directives is that the effects of any plan or project,

alone, or in combination with, other plans or projects, on the Natura 2000 site

network, should be assessed before any decision is made to allow that plan or

project to proceed. This process is known as Appropriate Assessment (AA). The

obligation to undertake an Appropriate Assessment derives from Article 6(3) and

6(4) of the Habitats Directive (92/43/EEC), and both involve a number of steps

and tests that need to be applied in sequential order.

Article 6(3) is concerned with the strict protection of sites, while Article 6(4) is

the procedure for allowing derogation from this strict protection in certain

restricted circumstances.

Article 6(3) of the Habitats Directive states:

“Any plan or project not directly connected with, or necessary to, the management of the site but

likely to have a significant effect thereon, either individually or in combination with other plans

or projects, shall be subject to appropriate assessment of its implications for the site in view of

the site’s conservation objectives. In the light of the conclusions of the assessment of the

implications for the site and subject to the provisions of paragraph 4, the competent national

authorities shall agree to the plan or project only after having ascertained that it will not

adversely affect the integrity of the site concerned and, if appropriate, after having obtained the

opinion of the general public”.

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Article 6(4) states:

“If, in spite of a negative assessment of the implications for the site and in the absence of

alternative solutions, a plan or project must nevertheless be carried out for imperative reasons

of overriding public interest, including those of social or economic nature, the Member State

shall take all compensatory measures necessary to ensure that the overall coherence of Natura

2000 is protected. It shall inform the Commission of the compensatory measures adopted. Where

the site concerned hosts a priority natural habitat type and/or a priority species, the only

considerations which may be raised are those relating to human health or public safety, to

beneficial consequences of primary importance for the environment or, further to an opinion from

the Commission, to other imperative reasons of overriding public interest.”

The competent authority is required to carry out Appropriate Assessment, as

required by Article 6(3) and 6(4) of the Habitats Directive, as follows:

Stage 1 - Screening for Appropriate Assessment – to assess, in view of best

scientific knowledge, if the development, individually or in combination with

another plan or project is likely to have a significant effect on the Natura 2000

site.

Stage 2 - Appropriate Assessment – This is required if it cannot be excluded,

on the basis of objective information, that the development, individually or in

combination with other plans or projects, will have a significant effect on a

Natura 2000 site. The appropriate assessment must include a final

determination by the competent authority as to whether or not a proposed

development would adversely affect the integrity of a Natura 2000 site. In

order to reach a final determination, the competent authority must undertake

examination, analysis and evaluation, followed by findings, conclusions and a

final determination. The appropriate assessment must contain complete,

precise and definitive findings and conclusions, and may not have lacunae or

gaps.

Stage 3 – Assessment of alternative solutions- the process which examines

alternative ways of achieving the objectives of the project or plan that avoid

adverse impacts on the integrity of the Natura 2000 site.

Stage 4 - Assessment where no alternative solutions exist and where

adverse impacts remain - an assessment of compensatory measures where, in

the light of an assessment of imperative reasons of overriding public interest

(IROPI), it is deemed that the project or plan should proceed.

If, based upon the currently available information, there are aspects of the

proposed development that could have a significant effect on any Natura 2000

sites, then further analysis in the form of an Appropriate Assessment is required.

If the outcome of the screening exercise is that there are no significant impacts

predicted, then an Appropriate Assessment is not required.

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2 Overview of the Proposed Development and

the Receiving Environment

2.1 Introduction

Dublin City Council (DCC), on behalf of the Office of Public Works (OPW),

intend to construct a new reinforced concrete L-wall along the right bank of the

River Dodder near the entrance to the Royal Dublin Society (RDS) grounds on

Anglesea Road in Ballsbridge, Dublin City. The proposed development (referred

to as the ‘RDS wall’) is being incorporated into the River Dodder Flood

Alleviation Works Phase 2D project design.

The Office of Public Works (OPW) have been carrying out the construction works

on behalf of DCC for the previous River Dodder Flood Alleviation Works and

will also construct the proposed development at the RDS wall.

As discussed in Section 1.1, the proposed works to the RDS wall are being

incorporated into the River Dodder Flood Alleviation Works Phase 2D design.

Phase 2D is part of the overall Dodder Flood Alleviation Works Phase 2C-2E

which are on-going and carried out under the approved Part 8 Planning

Application 2504/13, issued in 2013.

The approved works (Planning Application 2504/13) under the Phase 2C-2E

design are carried out along sections of the River Dodder from Smurfit Weir to

Landsdowne Railway Bridge, approximately 1.6km in length. This length of the

River Dodder includes the RDS wall. Under the approved Part 8 Planning

Application (Planning No. 2504/13), it was proposed to raise the parapet height of

the RDS wall however during the Phase 2D works the wall was found to have

insufficient wall thickness and hence structural strength to withstand (approved)

design condition.

2.2 Need for the Proposed Development

The Dodder Flood Alleviation Works Phase 2C to 2E include the section of the

River Dodder from Landsdowne Road Railway Bridge and upstream to Smurfit

Weir. This section of the river is referred to as the Lower Dodder APSRs or Area

of Potential Significant Risk in the Dodder CFRAMS Plan. APSRs are existing

urban areas with high degrees of flood risk. The Phase 2D works have been on-

going since 2016 and as a result the river has been modified to facilitate these

works. Dublin City Council intend to carry out works on the on a section of the

River Dodder wall by the RDS (referred to as the RDS wall) in Ballsbridge. The

proposed development is being incorporated into the River Dodder Flood

Alleviation Works Phase 2D project design.

During the Phase 2D works, the wall was found to have insufficient wall thickness

and hence structural strength to withstand design condition. The existing wall has

a number of structural weaknesses that require a new river wall to be built

including:

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No foundation or sour protection present;

Significant settlement of the existing wall;

Culverts and outfalls are collapsing;

Spalling (breaking) and cracking evident;

Loss of mortar and large stones recorded throughout;

Upper parapet has become separated from the separated lower wall;

Lower wall was found to have insufficient wall thickness and hence structural

strength of the existing wall is insufficient to withstand design condition; and

Loss of mortar and large stones recorded.

Wall repairs were carried out in November 2017 and May 2018 as part of

emergency works to assist with maintaining the integrity of the existing structure

prior to the construction of a new river wall. These works included vegetation

removal, localised repointing and the filling of significant voids. The emergency

works also include the underpinning of the right wall which is currently underway

and will be completed prior to the construction of the proposed development.

2.3 Site Description and Overview of Proposed

Development

The proposed development site is located on section of the river wall (right bank)

adjacent to Anglesea Road at the entrance to the RDS grounds. Refer to Figure 2.

The section of river where the works will be is non-tidal and approximately 2km

upstream of where the River Dodder discharges into the River Liffey estuary at

Sir John Rogerson’s Quay.

The proposed development area is downstream of the Herbert Park Lane (HPL)

bridge. The existing right bank consists of a low-level haul road, approximately 3-

4m wide that is being used for the Phase 2D on the right river wall. There are a

number of surface water outlets that discharge from Anglesea Road. Refer

Appendix B for photos of the site taken in April 2018. Immediately upstream of

HPL Bridge, there is an existing haul road. Vegetation has previously been

removed from the right bank. There are a number of mature trees along the

adjacent Anglesea Road footpath and these will be retained as part of the works.

The main elements of the proposed development include:

Removal of approximately 200m length of the existing RDS wall above

footpath level between Ballsbridge and just upstream of the HPL Bridge.

Construction of approximately 200m of new RDS river wall on the “wet side”

of the existing RDS wall with a new reinforced concrete L-wall river wall.

The new wall will be clad with thick coursed limestone with lime mortar

pointing and a rounded coping in keeping with surrounding flood defences

Width of footpath along Anglesea Road will increase from 2.8m to a

maximum width of approximately 3.4m wide.

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Widening of the existing in-stream right wall haul road to up to a maximum

width of 10m from the RDS wall to facilitate works;

Reinstatement of the original existing riverbed level (existing 2009 levels)

following the completion of the works (as agreed with Inland Fisheries

Ireland;

Retention of the existing trees along the Anglesea Road footpath; and

Services along Anglesea Road will remain unaffected during construction and

operation.

Refer to Figure 2 for the proposed development works areas.

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Figure 2: Proposed development works areas No.1 & No.2 and main construction compound. Source Bing Maps 2018.

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2.4 Description of the Proposed Development

2.4.1 Introduction

The total length of wall to be replaced (the proposed development) is

approximately 200m, shown on the engineering drawings, refer to Drawing No.

D-DR-W-0201 in Appendix A for the engineering drawings.

The river wall under HPL Bridge or the HPL Bridge will not undergo works as

part of the proposed works.

The L-wall will consist of an in-situ reinforced concrete base that extends up to

approximately 5.5m horizontally from the wall underneath the river bed. A shear

key or mini-piles may be required as part of the foundation design. The vertical

reinforced concrete stem will be built in front of the existing river wall with a

concrete infill between the two walls (existing and new). For heritage reasons, the

new wall will be debonded (separated) from the existing wall by means of a

suitable membrane or similar. All concrete will be poured in-situ.

The existing RDS wall will be removed above footpath level. The stone removed

will be re-used as cladding for the new footpath-level wall where possible. This

will extend the footpath to a maximum width of 3.4m, except at tie-in locations to

existing walls, where the current width footpath will be retained. The trees along

the footpath will be retained and the existing utilities under the footpath will also

be retained.

The top of the wall will be approximately 1.4m above street level with rounded

coping (in keeping with the surrounding flood defences) and a maximum of

750mm wide. The wall will be clad with 200mm thick coursed limestone cladding

with lime mortar pointing. The flood wall is designed to withstand a 1 in 100 year

flood event.

In-stream works will be required to carry out the L-wall construction as the base

of the wall will be buried in the riverbed. Services along Anglesea Road and

traffic restrictions that prohibit these works being carried out from Anglesea Road

(dry side) therefore works are carried out in-stream. In-stream works will be

carried out on the existing haul roads adjacent to the right wall. Haul roads will be

extended to a maximum width of 10m from the RDS wall. On completion of the

works, the riverbed will be reinstated to the 2009 levels with agreement of Inland

Fisheries Ireland (IFI).

The proposed development will take approximately ten months to complete.

Construction works will be limited to the hours of 7.30am - 4.30pm Monday to

Friday. Works will not be permitted outside these hours.

2.4.2 Works Areas

There are two works areas and one construction compound that will be used

during the construction phase:

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Works Area No. 1 – Upstream of Herbert Park Lane Bridge

This is an existing construction compound that has been used to complete works

upstream of the Herbert Park Lane Bridge. There is an existing river crossing that

will be used to carry out the works described here to the right river wall. The haul

road adjacent to the road will likely require some repair works to facilitate access.

No materials, machinery or equipment will be stored along the haul routes. These

areas will be kept clear when there are no construction works taking place. Refer

to Photo 2 in Appendix B for a photo of the existing haul road.

Works Area No. 2 – Downstream of Herbert Park Lane Bridge to the Old

Toilet Block at Ballsbridge

This existing compound facilities access to the right river wall downstream of the

Herbert Park Lane Bridge. It has been established during the River Dodder Flood

Alleviation Works Phase 2D. Refer to Photo 3 in Appendix B. No materials,

machinery or equipment will be stored along the haul routes. These areas will be

kept clear when there are no construction works.

Construction Compound at Beatty’s Avenue

This is an existing construction compound in for the Phase 2D works, located at

Beatty’s Avenue in Ballsbridge, refer to Figure 2. Materials and equipment as

well as some staff facilities will be located here.

2.4.3 Enabling and Construction Works

2.4.3.1 Haul Roads

In-stream works will be required to carry out the L-wall construction as the base

of the wall will be buried in the river bed. In addition, construction constraints due

to services present on Anglesea Road and traffic restrictions prohibit these works

being carried out from Anglesea Road (dry side). There is an existing haul road

along the right river wall which is being used to carry out the current flood

defence works. It may be necessary to widen the haul road to a maximum width of

10m from the RDS wall to facilitate the construction works. The haul road width

will also depend on the requirement to maintain river flow. Temporary sheet piles

may be installed along the haul road to provide ground stability during excavation

works. The use of temporary sheet piles will reduce water inflow into the

excavation and may reduce the maximum width required for the haul road. Refer

to an example shown in Photo 7 in Appendix B.

Preliminary consultation with Inland Fisheries Ireland (IFI) has indicated that the

haul road widening is acceptable provided that fish passage is maintained in the

river. The riverbed will be reinstated to the existing level (2009 levels) with

agreement of IFI. It is proposed to construct/repair the haul road before the end of

August 2018 and thus avoid any conflict with the fish-spawning season as has

previously been agreed with IFI for such works. Any works that are required

outside this timeframe will be agreed with IFI in advance.

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On completion of the works, the haul road will be removed and the riverbed will

be restored to its 2009 level as has been previously agreed with IFI for the

existing flood alleviation works. These 2009 levels have been recorded as part of

the River Dodder catchment flood risk assessment study (CFRAMS).

Repair and widening of the existing haul roads will require the placement of

imported granular material (clean broken stone) approximately 150mm in size.

The haul road will be 300mm above the general bed level. The placement of

granular material will only be carried out at a time of relatively low flows in the

River Dodder.

For works upstream of Herbert Park Lane Bridge, machinery will access the

existing haul road on the right bank from a ramp and river crossing which has

been previously established, refer to Figure 2 and to Photo 1 in Appendix B.

For works downstream of Herbert Park Lane Bridge, machinery will access the

existing haul road from an existing ramp from the old toilet block. Refer to

Figure 2 and Photo 2 in Appendix B.

2.4.3.2 Demolition

The existing flood defence wall will be removed to footpath level. This will be

carried out in stages as the new L-wall is being constructed. Hoarding will be

erected around the works areas for safety and restrict access.

The stone removed from the existing footpath level river wall will be reused for

the construction of the new footpath level wall where possible. Potential dust

generation will be limited as demolition of the wall will take place in stages.

2.4.3.3 Traffic Management

If necessary, a traffic management plan (TMP) will be designed, implemented,

maintained and de-mobilised by Dublin City Council. It is not envisaged that

traffic flow will be interrupted along Anglesea Road. Some parking along

Anglesea Road will temporarily be removed during the works.

2.4.3.4 Pedestrians

Access to the existing footpath adjacent to the RDS wall will be restricted as the

works progress. Pedestrians will be directed to temporarily use the footpath

adjacent to the RDS ground. The final footpath width will increase from

approximately 2.8m to approximately 3.3m wide and will be reinstated following

completion of the RDS wall construction.Sequence of Structural Works

The sequence of structural works is described here.

The proposed flood defence works on the right bank of River Dodder in Phase 2D

(Ballsbridge to Herbert Park Lane Bridge) will be built in stages with each 3m

long unit of wall completed at a time. There will be approximately 60 No.

concrete units over 200 linear meters of the wall over two sections (up and

downstream of HPL Bridge).

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Each unit will consist of the following elements:

Excavation for foundation base

Installation of mini-piles or shear key

Construction of wall base

In-situ concentrate wall pour in lifts

2.4.3.5 Excavation

For each works unit, the excavation of the structural base will be required. An

excavator will access the work unit from the haul road. A dumper truck will

access the haul road and remove any excavated material off-site for appropriate

disposal. The excavator will dig out the ground for the base of the existing wall.

Temporary sheet piles may be required to support the excavation, as mentioned in

Section 3.2.2. This will also reduce water ingress into the excavation. A trench

box may also be required for the excavation of the shear key to provide ground

stability, refer to an example of this in Photo 8 in Appendix B.

The 150mm water pump will be installed prior to the excavation works in

anticipation of use immediately afterwards. The area will be pumped continuously

after the excavation for the concrete base to clear all the water from the area and

then turned off.

The water will be discharged through a sediment bag, also known as a “dirt bag”,

prior to being discharged into the watercourse. The sediment bag is a semi-

permeable material that filters the pumped water to remove sediment. The dirt

bags will be placed on the overlying footpath and the filtered ‘clean’ water will be

discharged back into the watercourse. The material collected in the sediment bags

will be emptied into the site dumper truck and stockpiled in the Beatty’s Avenue

construction compound before being exported off-site. A mobile diesel generator

will be used on site to power the water pump.

Dust generation from excavation will be minimal as works will the excavated

material will typically be ‘wet’ riverbed material. Water be pumped to the

sedimentation bag throughout the excavation. Excavation for the concrete base

pours will be done on a staged basis as the wall is constructed in units, refer to

section 2.4.4. Therefore, noise generated from excavation and truck movements

will be limited and on par with the urbanised environment and high volumes of

traffic from Anglesea Road. Piling activity (installation of temporary sheet piles

and mini piles, if required) on the haul road will be carried out in stages as each

unit of the wall as it is being built.

2.4.3.6 Concrete Elements

The ground will be excavated for the base pour. The excavated material will be

placed in the dumper truck and removed for off-site disposal.

Interlocking concrete “Kelly” blocks (1500mm x 600mm x 600mm) will be used

to provide the concrete mould (shutter) the inside face of the base. Refer to an

example in Photo 5 in Appendix B.

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The prefabricated reinforcing steel cages will be lifted into position using the

hydraulic excavator. The cages are prefabricated in the construction compound on

Beatty’s Avenue.

Concrete will be poured directly from the concrete truck into the where possible.

Where the concrete truck is not able to access the pour site, concrete will be

poured into concrete buckets that can be filled at the concrete lorry and

transported to the pour site using the excavator. A tap at the base of the bucket

(skip) will be opened and concrete piped by gravity to where is needed. The

excavation, placing of pre-fabricated steel reinforced cage and concreting of the

base will take place in one day.

The base concrete unit will be power washed the following day to provide the

necessary bond to the next pour. This activity is carried out at the base of the new

wall and separated from the river channel by up to 10m of haul road (and

temporary sheet piles within the haul road, if required), which will act as a buffer

if any run-off that is not captured and pumped to the sedimentation bag.

The box section will be shuttered according to the design and concrete will be

poured into the shuttering to set. Shuttering provides the formwork or mould for

the concrete structure. The next day the box section will be power washed as

described for the base unit to prepare for the wall lifts.

Before the wall lifts commence, the voids between the back of the proposed wall

and the existing masonry wall will be filled. The void will be shuttered and will be

concreted as described above. The proposed works will be debonded (separated)

from the existing wall for heritage conservation purposes.

The wall lifts will consist of two or more concrete pours to achieve the required

wall height. Having concreted the voids and installing the membrane for isolating

the existing wall, all reinforcement required for the first concrete lift of the wall

will be tied by the steelfixer (OPW staff). The first lift of the wall will be

shuttered and concrete will be poured using the excavator and bucket. Refer to an

example shown in Photo 6 in Appendix A.

The wall shuttering will then be removed the following day and scaffolding will

be erected at the concrete base of the wall to facilitate further works. Having

concreted the first lift of the wall, the steelfixer will tie all reinforcement required

for the next concrete lift of the wall. The final lift height of the wall will vary in

height depending on the design.

As per the first lift, shuttering will be secured for the subsequent lifts and the

concrete will be poured using the excavator and bucket. The following day the

shutter will be removed. Refer to an example shown in Photo 7 in Appendix B.

2.4.3.7 Wall Cladding

Once the structural elements of the wall are complete, it will be cladded with

coursed limestone with lime mortar pointing. The cladding will be done from the

haul road and scaffolding will be erected where necessary. Where possible the

cladding will re-use the stone removed from the existing footpath level river wall.

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2.4.4 Reinstatement Works

Once the construction works are completed the footpath adjacent to the river wall

will be fully reinstated.

On completion of the works the haul roads and any temporary sheet piles will be

removed. The haul road material will be re-used to reinstate the riverbed where

possible, or disposed of off-site to a suitable waste facility. The riverbed will be

reinstated to existing (2009) levels with agreement IFI.

The river crossing up-stream of Herbert Park Lane Bridge will be removed on

completion of all flood alleviation works on this section of the river and normal

flow will be restored to pre-construction levels.

2.5 Operation Elements

Once the construction works are complete, on-going maintenance will be part of

the operational phase of the overall River Dodder Flood Alleviation Works as

necessary.

Under Section 37 of the Arterial Drainage Act 1945, the Office of Public Works

(OPW) is statutorily obliged to maintain all rivers, embankments and urban flood

defences on which it has executed works since the 1945 Act, in “proper repair and

effective\ condition”. These works may include minor repairs to the wall or

removal of any potential blockages at the HPL Bridge. Any in-stream works

required as part of maintenance will be agreed with IFI prior to the works.

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3 Ecological Overview

3.1 Site Baseline

The site for the proposed development is located within a dense urban area used

for a mixture of recreation/amenity (Herbert Park), commercial and residential.

The River Dodder is considered tidal downstream of Ballsbridge. The section of

river adjacent to the proposed development is upstream and not tidal. The river

water quality status of the River Dodder for the 2010-2015 monitoring period was

‘moderate’.

The River Dodder is bounded by river walls at the location of the proposed

development. At present, there is a haul road adjacent to the right river wall. This

was constructed as part of the River Dodder Flood Alleviation Works. There is no

vegetation along the right wall downstream of the Herbert Park Lane Bridge.

Upstream of the Herbert Park Lane Bridge there is some vegetation growing in

the river wall. Refer to Photo 4 in Appendix B.

On the left bank, the river wall is set back up from the riverbank. Vegetation is

present along this section with shrubs and some trees. The area has been

landscaped during the apartment development with evidence of planting. There

are no works proposed along the left bank as part of this proposed development.

Refer to Photo 2 in Appendix B.

3.2 Zone of Influence

The zone of influence comprises the area within which the proposed development

may potentially affect the conservation objectives or qualifying interests (QI) of a

Natura 2000 site. There is no recommended zone of influence, and guidance from

the National Parks and Wildlife Service (NPWS) recommends that the distance

should be evaluated on a case-by-case basis with reference to the nature, size and

location of the project, and the sensitivities of the ecological receptors, and the

potential for in-combination effects (cumulative).

In ecological and environmental impact assessment, for an impact to occur there

must be a risk enabled by having a source (e.g. construction works at a proposed

development site), a ‘receptor’ (e.g. a Special Area of Conservation (SAC) or

other ecologically sensitive feature), a pathway between the source and the

receptor (e.g. a watercourse which connects the proposed development site to the

SAC).

Consideration is therefore given to the source-pathway-receptor linkage and

associated risks between the proposed development and Natura 2000 sites. For a

significant effect to occur there needs, to be a risk associated with pollutant

linkages whereby a source (i.e. contaminant or pollutant arising from construction

activities) affects a particular receptor (i.e. Natura 2000 site) through a particular

pathway (e.g. a watercourse which connects the proposed development with the

Natura 2000 site).

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The identification of risk does not automatically mean that an effect will occur,

nor that it will be significant. The identification of these risks means that there is a

possibility of environmental or ecological damage occurring. The level and

significance of the effect depends upon the nature of the consequence, likelihood

of the risk and characteristics of the receptor. The precautionary principle is

applied for the purposes of screening to ensure that consideration and pre-emptive

action is undertaken where there is a lack of scientific evidence.

Given the low level of emissions predicted from the proposed development, it was

considered that the zone of influence of the proposed development would not

extend beyond a 15km radius of the site boundary.

3.3 Natura 2000 Sites

Natura 2000 sites (European sites) are only at risk from significant effects where a

source-pathway-receptor link exists between a proposed development and a

Natura 2000 site(s). This can take the form of a direct impact (e.g. where the

proposed development and/or associated construction works are located within the

boundary of the Natura 2000 site(s)), or an indirect impact where impacts outside

of the Natura 2000 site(s) affect ecological receptors within (e.g. impacts to water

quality which can affect riparian habitats at a distance from the impact source).

As a general rule of thumb, it is often considered appropriate to examine all

Natura 2000 sites within 15km as a starting point. In some instances, where there

are hydrological connections, a whole river catchment, a marine area or a

groundwater aquifer may need to be included.

As a starting point, all Natura 2000 sites within 15km of the proposed

development were examined. Given the low level of emissions predicted from the

proposed development and the potential source-pathway-receptors identified, it

was considered that the ZoI of the works would not extend beyond 15km.

Section 3.3.1 and 3.3.2 discusses the direct and indirect impacts of the proposed

development on SAC and SPA sites respectively within the ZoI. Section 3.7

discusses the cumulative impacts of the proposed development.

3.3.1 Special Protection Areas within the Zone of Influence

Table 1 below lists the Special Protection Areas within the Zone of Influence

(ZoI) and the distance of the sites from the proposed development. The distance is

calculated for over land (i.e. as the crow flies) and the hydrological distance

between the River Dodder and the Natura 2000 site boundary.

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Table 1: SPA sites within the Zone of Influence and the qualifying interests.

Special Areas of

Conservation Sites Site Code

Distance from the proposed

development to the Natura 2000 site

(over land/hydrological distance)

(km) Qualifying Interests

South Dublin Bay and River

Tolka Estuary SPA

004024 1.3km/4.6km downstream

Light-bellied Brent Goose (Branta bernicla hrota) [A046]

Oystercatcher (Haematopus ostralegus) [A130]

Ringed Plover (Charadrius hiaticula) [A137]

Grey Plover (Pluvialis squatarola) [A141]1

Knot (Calidris canutus) [A143]

Sanderling (Calidris alba) [A144]

Dunlin (Calidris alpina) [A149]

Bar-tailed Godwit (Limosa lapponica) [A157]

Redshank (Tringa totanus) [A162]

Black-headed Gull (Chroicocephalus ridibundus) [A179]

Roseate Tern (Sterna dougallii) [A192]

Common Tern (Sterna hirundo) [A193]

Arctic Tern (Sterna paradisaea) [A194]

Wetland and Waterbirds [A999]

North Bull Island SPA 004006 4.9km/7.2km downstream Light-bellied Brent Goose (Branta bernicla hrota) [A046]

Shelduck (Tadorna tadorna) [A048]

Teal (Anas crecca) [A052]

Pintail (Anas acuta) [A054]

Shoveler (Anas clypeata) [A056]

Oystercatcher (Haematopus ostralegus) [A130]

Golden Plover (Pluvialis apricaria) [A140]

Grey Plover (Pluvialis squatarola) [A141]

Knot (Calidris canutus) [A143]

Sanderling (Calidris alba) [A144]

1 The Grey Plover Pluvialis squatarola is proposed for removal from the list of Special Conservation Interests for South Dublin Bay and River Tolka Estuary SPA. As a result, a site-

specific conservation objective has not been set for this species. (Site Synopsis South Dublin Bay and River Tolka Estuary SPA, NPWS, 9 March 2015)

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Special Areas of

Conservation Sites Site Code

Distance from the proposed

development to the Natura 2000 site

(over land/hydrological distance)

(km) Qualifying Interests

Dunlin (Calidris alpina) [A149]

Black-tailed Godwit (Limosa limosa) [A156]

Bar-tailed Godwit (Limosa lapponica) [A157]

Curlew (Numenius arquata) [A160]

Redshank (Tringa totanus) [A162]

Turnstone (Arenaria interpres) [A169]

Black-headed Gull (Chroicocephalus ridibundus) [A179]

Wetland and Waterbirds [A999]

Baldoyle Bay SPA 004016 10.4km/24km downstream Light-bellied Brent Goose (Branta bernicla hrota) [A046]

Shelduck (Tadorna tadorna) [A048]

Ringed Plover (Charadrius hiaticula) [A137]

Golden Plover (Pluvialis apricaria) [A140]

Grey Plover (Pluvialis squatarola) [A141]

Bar-tailed Godwit (Limosa lapponica) [A157]

Wetland and Waterbirds [A999]

Dalkey Islands SPA 004172 10.5km/15km downstream Roseate Tern (Sterna dougallii) [A192]

Common Tern (Sterna hirundo) [A193]

Arctic Tern (Sterna paradisaea) [A194]

Wicklow Mountains SPA 004040 10.7km/20km upstream Merlin (Falco columbarius) [A098]

Peregrine (Falco peregrinus) [A103]

Howth Head Coast SPA 004113 12.3km/14.2km downstream Kittiwake (Rissa tridactyla) [A188]

Ireland’s Eye SPA 004117 13.5km/21km downstream Cormorant (Phalacrocorax carbo) [A017]

Herring Gull (Larus argentatus) [A184]

Kittiwake (Rissa tridactyla) [A188]

Guillemot (Uria aalge) [A199]

Razorbill (Alca torda) [A200]

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Special Areas of

Conservation Sites Site Code

Distance from the proposed

development to the Natura 2000 site

(over land/hydrological distance)

(km) Qualifying Interests

Broadmeadow/

Swords Estuary SPA

004025 14.5km/27.1km downstream Great Crested Grebe (Podiceps cristatus) [A005]

Light-bellied Brent Goose (Branta bernicla hrota) [A046]

Shelduck (Tadorna tadorna) [A048]

Pintail (Anas acuta) [A054]

Goldeneye (Bucephala clangula) [A067]

Red-breasted Merganser (Mergus serrator) [A069]

Oystercatcher (Haematopus ostralegus) [A130]

Golden Plover (Pluvialis apricaria) [A140]

Grey Plover (Pluvialis squatarola) [A141]

Knot (Calidris canutus) [A143]

Dunlin (Calidris alpina) [A149]

Black-tailed Godwit (Limosa limosa) [A156]

Bar-tailed Godwit (Limosa lapponica) [A157]

Redshank (Tringa totanus) [A162]

Wetland and Waterbirds [A999]

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3.3.1.1 Direct Impacts

There will be no direct impacts on any sites designated as Special Protection

Areas. The proposed development works are not within or in proximity to any

Natura 2000 sites, refer to Table 1. The nearest SPA site, South Dublin Bay and

River Tolka Estuary SPA (Site code 004024) is approximately 4.6km downstream

(or 1.3km overland) of the River Dodder. None of the qualifying interest (QI)

species, which form part of the SPAs listed in Table 1, will be directly impacted

by the proposed development during construction or operation.

3.3.1.2 Indirect Impacts

The conservation objectives for the SPAs listed in Table 1, is to maintain

favourable conservation conditions for the species and habitats listed for each

SPA.

The SPA sites listed in Table 1 are predominantly species that are found in

coastal habitats including mud flats, wetlands, intertidal flats, sand flats and areas

of shallow water. These habitats provide areas suitable for feeding, nesting and

feeding in the sheltered shallow waters and organic rich mudflats. These sites are

significant for wintering birds that use the sites such as the Light-bellied Brent

Goose, which are known to move between the south and north Dublin bays.

The area of the proposed development is not an area of significant interest to these

bird species for roosting or foraging. The river is fast flowing and there is only

vegetation along a section of the left bank where works will not be carried out.

The site is in a highly urbanised environment with high volumes of traffic and

associated noise. The existing river channel is highly modified; the flow rates and

lack of shallow water (except during low rainfall) is unsuitable for feeding for

most species listed in Table 1.

There is a hydrological linkage to these SPA sites in Dublin Bay as the works will

be within the River Dodder channel. However, it is not considered that these QI

species would typically use this section of the River Dodder for prey species such

as fish and other aquatic invertebrates due to the unsuitable nature of the river (i.e.

deep, fast flowing water) for such potential prey.

The main potential downstream impacts relate to increased levels of suspended

solids in surface water runoff. The proposed works will generate run-off as a

results of construction activities; pumping of water during the excavation of the

riverbed at the base of the existing RDS wall and power washing of each unit of

set concrete before the next concrete pour. However, it is not expected that the

levels of run-off will be significant due to the nature and short duration of the

proposed works. The length of wall to be constructed is only 200m and will be

constructed in stages. The quantities of daily run-off material that will be

generated as a result of these activities will not be significant. The presence of the

haul road (and temporary sheet piles, if required) will act as a buffer and will

facilitate the drainage of any run-off containing sediment.

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The Natura 2000 sites downstream are not sensitive to sediment loading and are

all located in estuarine/ tidal areas in Dublin Bay which are subject to large

diurnal tidal flows carrying substantial volumes of sediment. Any habitats or

species in these areas are well used to varying levels of salinity, flows and

suspended solids. The distance between the proposed development works area and

the closest downstream Natura 2000 sites (4.6km) further reduces the risk of any

significant impact if sediment loading or pollution (e.g. fuel spill) was to occur.

This distance, combined with the considerable assimilative capacity of Dublin

Bay means that the level of suspended solids from the proposed works which

could possibly end up in the Dodder and downstream in the Bay will not have a

significant impact on these Natura 2000 sites.

Therefore, it is concluded that the proposed development works (or operation

phase) will not significantly impact any of the species of conservation interest of

the SPA sites or their prey given the following factors:

The nature of the works in a city centre urban environment.

Unsuitability of the habitats within or in proximity to the works areas.

The low ecological sensitivity of the downstream Natura 2000 sites to

sediment loading

Distance of the works area from the nearest SPA site (South Dublin Bay and

River Tolka Estuary SPA, site code 004024) which is 4.6km downstream of

the proposed works.

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Figure 3: Natura 2000 sites in proximity to the proposed development area. Source NPWS | Not to scale.

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3.3.2 Special Areas of Conservation within the Zone of

Influence

Table 2 lists the Special Areas of Conservation within the ZoI of the proposed

development. The distance is calculated for over land (i.e. as the crow flies) and

the hydrological distance between the River Dodder and the Natura 2000 site

boundary.

Table 2: Special Area of Conservation (SAC) sites within Zone of Influence.

SAC Sites Site Code

Distance from the

proposed development

to the Natura 2000 site

(over land / hydrological

distance) (km) Qualifying Interests

South Dublin Bay

SAC

000210

1.4km / 4.6km

downstream

Mudflats and sandflats not covered by

seawater at low tide [1140]

Annual vegetation of drift lines [1210]

Salicornia and other annuals colonising

mud and sand [1310]

Embryonic shifting dunes [2110]

North Dublin Bay

SAC

000206

4.9km / 6.8km

downstream

Mudflats and sandflats not covered by

seawater at low tide [1140]

Annual vegetation of drift lines [1210]

Salicornia and other annuals colonising

mud and sand [1310]

Atlantic salt meadows (Glauco-

Puccinellietalia maritimae) [1330]

Mediterranean salt meadows (Juncetalia

maritimi) [1410]

Embryonic shifting dunes [2110]

Shifting dunes along the shoreline with

Ammophila arenaria (white dunes)

[2120]

Fixed coastal dunes with herbaceous

vegetation (grey dunes) [2130]

Humid dune slacks [2190]

Petalophyllum ralfsii (Petalwort) [1395]

Rockabill to Dalkey

Island SAC

003000

9.4km / 11.4km

downstream

Reefs [1170]

Phocoena phocoena (Harbour Porpoise)

[1351]

Howth Head SAC

000202

10.1km / 11.5km

downstream

Vegetated sea cliffs of the Atlantic and

Baltic coasts [1230]

European dry heaths [4030]

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SAC Sites Site Code

Distance from the

proposed development

to the Natura 2000 site

(over land / hydrological

distance) (km) Qualifying Interests

Baldoyle Bay SAC 000199 10.4km / 21.7km

downstream

Mudflats and sandflats not covered by

seawater at low tide [1140]

Annual vegetation of drift lines [1210]

Salicornia and other annuals colonising

mud and sand [1310]

Embryonic shifting dunes [2110]

Wicklow Mountains

SAC

002122 10.4km / 20km upstream Oligotrophic waters containing very few

minerals of sandy plains (Littorelletalia

uniflorae) [3110]

Natural dystrophic lakes and ponds

[3160]

Northern Atlantic wet heaths with Erica

tetralix [4010]

European dry heaths [4030]

Alpine and Boreal heaths [4060]

Calaminarian grasslands of the

Violetalia calaminariae [6130]

Species-rich Nardus grasslands, on

siliceous substrates in mountain areas

(and submountain areas, in Continental

Europe) [6230]

Blanket bogs (* if active bog) [7130]

Siliceous scree of the montane to snow

levels (Androsacetalia alpinae and

Galeopsietalia ladani) [8110]

Calcareous rocky slopes with

chasmophytic vegetation [8210]

Siliceous rocky slopes with

chasmophytic vegetation [8220]

Old sessile oak woods with Ilex and

Blechnum in the British Isles [91A0]

Lutra lutra (Otter) [1355]

Glenasmole Valley

SAC

001209 11.8km / 17km upstream Semi-natural dry grasslands and

scrubland facies on calcareous

substrates (Festuco-Brometalia) (*

important orchid sites) [6210]

Molinia meadows on calcareous, peaty

or clayey-silt-laden soils (Molinion

caeruleae) [6410]

Petrifying springs with tufa formation

(Cratoneurion) [7220]

Knocksink Wood

SAC

000725 12.7km / No hydrological

pathway

Petrifying springs with tufa formation

(Cratoneurion) [7220]

Alluvial forests with Alnus glutinosa

and Fraxinus excelsior (Alno-Padion,

Alnion incanae, Salicion albae) [91E0]

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SAC Sites Site Code

Distance from the

proposed development

to the Natura 2000 site

(over land / hydrological

distance) (km) Qualifying Interests

Malahide Estuary

SAC

000205 13.8km / 28km

downstream

Mudflats and sandflats not covered by

seawater at low tide [1140]

Salicornia and other annuals colonising

mud and sand [1310]

Atlantic salt meadows (Glauco-

Puccinellietalia maritimae) [1330]

Mediterranean salt meadows (Juncetalia

maritimi) [1410]

Shifting dunes along the shoreline with

Ammophila arenaria (white dunes)

[2120]

Fixed coastal dunes with herbaceous

vegetation (grey dunes) [2130]

Ballyman Glen SAC 000713 13.8km / No hydrological

pathway

Petrifying springs with tufa formation

(Cratoneurion) [7220]

Alkaline fens [7230]

Ireland’s Eye SAC 002193 13.8km / 21km

downstream

Perennial vegetation of stony banks

[1220]

Vegetated sea cliffs of the Atlantic and

Baltic coasts [1230]

3.3.2.1 Direct Impacts

There will be no direct impacts on any sites designated as Special Areas of

Conservation. The proposed development works are not within or in proximity to

any SAC sites, refer to Table 2. The nearest SAC site, South Dublin Bay SAC

(site code 000210) is approximately 5km downstream (or 1.4km overland) from

the proposed development. None of the qualifying interest (QI) species, which

form part of the SAC listed in Table 2, will be directly impacted by the proposed

development during construction or operation.

3.3.2.2 Indirect Impacts

The potential pathways for QI species or habitats, which form part of the SACs

listed in Table 2, were assessed within the zone of influence. The only SACs of

relevance are sites that have mobile species that move up and down the River

Dodder and those SACs that are downstream of the proposed development.

Downstream Special Areas of Conservation

Similar to the SPAs discussed above, the main potential downstream impacts

relate to increased levels of suspended solids in surface water runoff.

The proposed works will generate run-off as a results of construction activities;

pumping of water during the excavation of the riverbed at the base of the existing

RDS wall and power washing of each unit of set concrete before the next concrete

pour. However, it is not expected that the levels of run-off will be significant due

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to the nature and short duration of the proposed works. The length of wall to be

constructed is just 200m and will be constructed in 3m stages.

The quantities of daily run-off material that will be generated as a result of these

activities will not be significant. The presence of the haul road will act as a buffer

and will facilitate the drainage of any run-off containing sediment.

The Natura 2000 sites downstream are not sensitive to sediment loading and are

all located in estuarine/ tidal areas in Dublin Bay, which are subject to large

diurnal tidal flows carrying substantial volumes of sediment. Any habitats or

species in these areas are subject to varying levels of salinity, flows and

suspended solids. The distance between the proposed development works area and

the closest downstream Natura 2000 sites (4.6km) further reduces the risk of any

significant impact if sediment loading or pollution (e.g. fuel spill) was to occur.

This distance, combined with the considerable assimilative capacity of Dublin

Bay means that the level of suspended solids from the proposed works which

could possibly end up in the Dodder and downstream in the Bay will not have a

significant impact on these Natura 2000 sites.

Mobile species

There are two mobile species of relevance identified:

Harbour Porpoise Phocena, Rockabill to Dalkey Island SAC (Site Code

004172)

Otter Lutra, Wicklow Mountains SAC (Site Code 004040)

The Harbour Porpoise is found in the marine environment in Dublin Bay. It would

not be likely that this species would come into proximity with the proposed

development work site along the River Dodder.

Otters are listed as a species of conservation interest in the Wicklow Mountains

SAC. The Wicklow Mountains SAC is approximately 10.4km overland or 20km

upstream from the proposed development works site. The Dodder tributaries

originate in the Wicklow Mountains, providing a potential hydrological pathway

for otters to travel downstream. Though uncommon, otters are known to move

outside their territories for food.

Otters have been recorded along the River Dodder. Otters are protected species

under Annex II of the Habitats Directive. Their resting place is fully protected and

any interference with a holt (burrow) or access to it is prohibited except under

derogation.

Roughan O’Donovan (ROD) conducted ecological surveys along the River

Dodder as part of the proposed Doddder Greenway. These ecological surveys

included the works areas for the proposed RDS wall works. This assessment

included an otter survey in April-May 2017. No holts were identified within the

proposed development works area. The nearest holts identified were on the

northern (left bank) of the River Dodder approximately 450m upstream of the

Herbert Park Lane Bridge and approximately 730m downstream of Ballsbridge

near the Aviva Stadium.

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The online National Biodiversity Data Centre database was checked for

recordings of evidence of otter (holts or spraints) within or in proximity to the

proposed development works site. There was one submission2 (made in 2016) that

recorded otter spraints (otter faeces) along the left bank at Ballsbridge.

In May 2018, an ecological survey was carried out by ecologist Brain Keeley

(Wildlife Surveys Ltd) for the proposed works. The survey included the proposed

works areas and 200m up and downstream of the works area boundary. The area

was surveyed for evidence of otter, badger and kingfisher habitats. The results of

the surveys found no evidence of otter holts (or spraints) within the works area or

within 200m up and downstream of the works area. An ecological report was

prepared as part of the survey and is attached to this report in Appendix D.

During the ecological survey, local residents reported sightings and spraints of

otters within the works area. Otters were reported as using the left bank and haul

roads to move up and down the river during the flood alleviation works at

Ballsbridge. Otters are typically most active in the early mornings and evenings

and therefore will not be disturbed by construction works which will take place

during the daytime. Fish are a food source for the otters and their passage (and

consequently otter passage) will not be impeded by the construction works.

Therefore, it is concluded that the proposed works will not have a significant

impact on otters for the following factors:

There is no evidence of otter holts within or in proximity of the proposed

development.

Reports of otter sightings and spraints suggest the otters have continued the

proposed works area, during the previous construction works that have taken

place along this section of the River Dodder. The proposed works will be no

more intrusive than previous and current operations.

Otter passage will not be impeded by the construction works.

The food source (fish) will not be impeded from moving up and downstream

of the river.

The works will take place during the day and not conflict with the typically

active hours of the species.

The works are unlikely to have a significant negative effect on the water

quality of River Dodder.

3.4 Other Designated Sites

Natural Heritage Areas (NHAs) and Proposed Natural Heritage Areas (pNHAs)

can be considered to be ‘stepping stones’ between Natura 2000 sites and are

therefore considered in this assessment. Consultation of NPWS online data

identified 21 No. pNHA sites and no NHA sites within 15km of the proposed

development site.

2 Recording number O178322, date 27/02/2016

(https://maps.biodiversityireland.ie/Species/119290)

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

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These are listed in Table 3 and the distances from the site of the proposed

development are also provided. Figure 9 shows the location of those in the

immediate vicinity of the proposed development site.

North Dublin Bay pNHA and South Dublin Bay pNHA overlap the North Dublin

SPA and South Dublin Bay and River Tolka Estuary SPA respectively. As

discussed for these sites in Section 3.3.1, the proposed development does not

contain any habitats that would likely be used by bird species at these sites for

nesting or feeding. There is a hydrological link between the proposed

development and these downstream sites, however it is unlikely that the proposed

development will have a significant impact on these habitats or species.

Table 3: Proposed Natural Heritage Areas (pNHAs) within 15km of the proposed

development.

Proposed Natural Heritage Area Site Code

Distance from closest

section of proposed

development (km)

Grand Canal pNHA 002104 1.1

South Dublin Bay pNHA 000210 1.3

Booterstown Marsh pNHA 001205 2.7

Royal Canal pNHA 002103 2.3

Dolphins, Dublin Docks pNHA 000201 2.7

North Dublin Bay pNHA 000206 3.7

Fitzsimon's Wood pNHA 001753 6.4

Dalkey Coastal Zone And Killiney Hill pNHA 001206 7.9

Dodder Valley pNHA 000991 7.9

Santry Demesne pNHA 000178 7.7

Liffey Valley pNHA 000128 8.4

Howth Head pNHA 000202 10.2

Dingle Glen pNHA 001207 10.2

Baldoyle Bay pNHA 000199 10.2

Loughlinstown Woods pNHA 001211 11.2

Ballybetagh Bog pNHA 001202 11.5

Glenasmole Valley pNHA 001209 12.0

Sluice River Marsh pNHA 001763 11.6

Feltrim Hill pNHA 001208 11.9

Knocksink Wood pNHA 000725 13.1

Lugmore Glen pNHA 001212 13.2

Ireland's Eye pNHA 000203 13.7

Malahide Estuary pNHA 000205 13.9

Ballyman Glen pNHA 000713 14.0

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 Page 30

Figure 4: Proposed Natural Heritage Areas (pNHAs) nearby proposed development (No Natural Heritage Areas (NHAs) within the map extent). | Source: NPWS website |

Not to scale.

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Page 31

3.5 Rare and Protected Species

The proposed development is located within the NPWS 10 kilometre grid square

013. The National Parks and Wildlife Service database (www.npws.ie) was

consulted with regard to rare species and species protected under the Flora

Protection Order (S.I. No. 356 of 2015) within this square.

A number of species were listed within the 10km grid square however, no species

were recorded in proximity to the proposed development. The nearest recording of

a protected species was Puccinellia fasciculate Tufted Salt-marsh Grass in

Sandymount (1840). This species listed in Schedule A of the Flora Protection

Order (2015). Given the fresh water environment of the proposed development,

the area is unsuitable for this species and unlikely to occur.

3.6 Fisheries

The River Dodder is considered significant regional salmonoid catchments for

species of salmon and trout3. The River Dodder is not listed on the First Schedule

of the European Communities (Quality of Salmonoid Waters) Regulations (S.I.

No. 293 of 1988). The Regulations provide protection to water quality of the

rivers listed and are subject to regular sampling to monitoring.

Under the Eastern River Basin Management Plan 2009-2015, the “Dodder Lower”

is reported as having the following status:

Macroinvertebrate Status - Poor

General Physical Chemical Status - Moderate

Fish Status - Good

Interim Overall Status - Poor

Previous flood alleviation works as part of the overall Dodder Flood Alleviation

Works Phase 2C-2E have been carried out in close consultation with Inland

Fisheries Ireland (IFI) and this will this will continue with these proposed works.

The free passage of fish will be maintained throughout the construction works. On

completion of the proposed works the river crossing and haul roads will be

removed and river channel will be reinstated to 2009 levels.

3 Dublin City Biodiversity Action Plan 2015-2020

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

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4 Cumulative Impacts with other Projects

The proposed Dodder Greenway route will run parallel to the proposed

development utilising the existing path along the southern boundary of Herbert

Park to Herbert Park Lane. Works for the Greenway have been previously

integrated into the flood alleviation works (Phase 2C) along a section of the

Dodder between Anglesea Bridge and Herbert Park.

During the construction of the proposed works this section of the path is closed as

it is required to be used as construction compound and access route from the left

bank of the river to works on the right bank. This access point will also be used

for the proposed development to access the right river wall upstream of Herbert

Park Lane Bridge.

It is likely that the proposed works will be complete prior to any necessary works

to the Greenway route.

As discussed in Section 2.2, the proposed development will be incorporated into

the on-going Dodder Flood Alleviation Works Phase 2C to 2E design. There is

potential that some of the works approved under Phase 2C-2E (Planning

Application 2504/13) will be under construction at the same time as the

construction of the proposed development. However, it is not envisioned that there

will be significant cumulative environmental effects. The proposed works will

utilise existing temporary river crossings and widen the existing haul roads that

have previously been constructed for the on-going Phase 2D works at Ballsbridge.

Any on-going approved Phase 2C to 2E flood alleviation works within or in

proximity to the proposed works area are unlikely to constructed at the same time

as the proposed development given the space constraints within the proposed

works area and limited plant and staff resources (the OPW will carry out all Phase

2C-2E flood alleviation works including the proposed works).

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

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5 Assessment of Significance

The proposed development will not result in any significant direct, indirect or

cumulative impacts on Natura 2000 sites. Refer to Table 4 below, has been used

to determine whether significant impacts are likely.

Table 4: Significant Impacts Checklist

Does the project have the potential to Yes or No

Reduce the area of key habitats? No

Reduce the population of key species? No

Change the balance between key species? No

Reduce diversity of the site? No

Result in disturbance that could affect population size or density or the balance

between key species? No

Result in fragmentation? No

Result in loss or reduction of key features (e.g. tree cover, tidal exposure, annual

flooding, etc.)? No

Cause delays in progress towards achieving the conservation objectives of the site? No

Interrupt progress towards achieving the conservation objectives of the site? No

Disrupt those factors that help to maintain the favourable conditions of the site No

Interfere with the balance, distribution and density of key species that are the

indicators of the favourable condition of the site? No

Cause changes to the vital defining aspects (e.g. nutrient balance) that determine

how the site functions as a habitat or ecosystem? No

Change the dynamics of the relationships (between, for example, soil and water or

plants and animals) that define the structure and/or function of the site? No

Interfere with predicted or expected natural changes to the site (such as water

dynamics or chemical composition)? No

In addition, this judgement has been arrived at on the following basis:

The works area is unlikely to be used by bird species listed as qualifying

interests in the special protection areas in Dublin Bay due to the lack of

suitable habitat for feeding or nesting.

The proposed works are unlikely to disturb otter species that have the potential

to travel downstream from the Wicklow Mountains SAC (site code 002122),

where they are a QI species. The ecological survey (May 2018) concluded that

there is no evidence of otter holts within or in proximity (200m up and

downstream). Any individuals that use the River Dodder within or in

proximity to the works area are likely to be present outside construction hours

due to the times the species is known to be most active. Reports of otters

present within the proposed development works area (including haul roads)

during previous flood alleviation works suggests that the species continues to

use the site despite construction activities and alterations to the river channel

i.e. haul roads.

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

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The Natura 2000 sites downstream are not sensitive to sediment loading and

are all located in estuarine/ tidal areas in Dublin Bay which are subject to large

diurnal tidal flows carrying substantial volumes of sediment. Any habitats or

species in these areas are well used to varying levels of salinity, flows and

suspended solids. The distance between the proposed development works area

and the closest downstream Natura 2000 sites (4.6km) further reduces the risk

of any significant impact if sediment loading or pollution (e.g. fuel spill) was

to occur. This distance, combined with the considerable assimilative capacity

of Dublin Bay means that the level of suspended solids from the proposed

works which could possibly end up in the Dodder and downstream in the Bay

will not have a significant impact on these Natura 2000 sites.

There will be some noise emissions but these will be temporary and on par

with the surrounding urban environment and traffic noise. Dust emissions

generated during demolition of the wall however, these will be limited as these

works will be conducted in stages.

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Page 35

6 Conclusions

The aims of this report were as follows:

Provide information on, and assess the potential for the proposed development

to significantly impact on Natura 2000 Sites (also known as European sites).

Determine whether the proposed development is directly connected with, or

necessary to the conservation management of any Natura 2000 sites.

Determine whether the proposed development, alone or in combination with

other projects, is likely to have significant effects on Natura 2000 sites in view

of their conservation objectives.

It has been objectively concluded by Arup that:

There is no potential for the proposed development to significantly impact on

Natura 2000 Sites.

The proposed development is not directly connected with, or necessary to the

conservation management of any Natura 2000 sites.

The proposed development, alone or in combination with other projects, are

not likely to have significant effects on Natura 2000 sites in view of their

conservation objectives.

It has been determined by Arup that it is possible to rule out likely significant

impacts on any Natura 2000 sites. It is the view of Arup that it is not necessary to

undertake any further stage of the Appropriate Assessment process.

Refer to Appendix C Finding of No Significant Effects Report.

Appendix A

Engineering Drawings

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Page A1

A1 Engineering Drawings

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Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

Dodder Flood Alleviation Project

1:1000

June 2018

RDS Wall Planning

Location Map

For Planning

219346 D-DR-W-0200 P02

Phase 2C

Area 2D

Area 2E

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Site Notice Location

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LOCATIONS

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Do not scale

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Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

Dodder Flood Alleviation Project

1:500

June 2018

RDS Wall Planning

Site Layout

For Planning

219346 D-DR-W-0201 P01

Phase 2C

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Proposed Site Boundary

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RAISED GRASS AREA

EXISTING TREES TO

BE RETAINED

WIDENING OF EXISTING

FOOTPATH

EXISTING WALL REMOVED TO

FOOTPATH LEVEL

WALL FOUNDATION TO BE

CONFIRMED AT DETAILED

DESIGN STAGE

NEW RIVER WALL TO MATCH

SLOPE OF EXISTING RIVER

WALL. SEE NOTE 7

PART OF DODDER FRS MAIN WORKS,

TO BE COMPLETED AFTER

CONSTRUCTION OF RDS WALL

EXISTING TREES TO BE RETAINED

Anglesea Road

RIVER DODDER

PART OF DODDER FRS MAIN WORKS,

TO BE CONSTRUCTED AFTER

COMPLETION OF RDS WALL

REFER TO DETAIL A-A ON

DRAWING D-DR-W-2201

LOCATION OF EXISTING CULVERT.

CULVERT APPROXIMATELY 1.5m WIDE.

LOCATION OF EXISTING CULVERT.

CULVERT APPROXIMATELY 1.5m WIDE.

EXISTING TREES TO

BE RETAINED

EXISTING WALL TO BE REMOVED

TO FOOTPATH LEVEL

RIVER DODDER

Anglesea Road

EXISTING TREES TO

BE RETAINED

WALL FOUNDATION TO BE

CONFIRMED AT DETAILED

DESIGN STAGE

NEW RIVER WALL TO MATCH

SLOPE OF EXISTING RIVER

WALL. SEE NOTE 7

Anglesea Road

WIDENING OF EXISTING

FOOTPATH

A1 A

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B C D E F G H I J K L M N O P

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Drawing Title

Issue Date By Chkd Appd

Project TitleContractor

© Arup

Do not scale

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Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

Dodder Flood Alleviation Project

1:100

June 2018

Area 2D - RDS River Wall

Proposed Flood wall

Plan Layout Chainage 17520 - 17420

Planning

219346 D-DR-W-0202 P02

PLAN

Scale 1:100

NOTES :

P01 18/06/2018 PW BT IA

REINFORCED

CONCRETE L-WALL

EXISTING WALL

MASONRY CLADDING

FOOTPATH

Phase 2C

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1. ALL LEVELS ARE IN M ABOVE O.D. MALIN.

2. ALL DIMENSIONS IN mm UNLESS

OTHERWISE NOTED.

3. REFER TO DRAWING NO. D-DR-W-2200 FOR

TYPICAL SECTION

4. CONCRETE CLASS SHALL BE C40/50..

CONCRETE EXPOSURE SHALL BE XS2.

5. DO NOT SCALE FROM DRAWINGS, USE

FIGURED DIMENSIONS ONLY.

7. EXISTING TREES TO BE RETAINED

8. NEW WALL TO BE CLAD WITH 200mm THICK

COURSED LIMESTONE WITH LIME MORTAR

POINTING TO MATCH EXISTING

9. ORIGINAL STONE WALL WILL BE REUSED

WHERE POSSIBLE FOR THE CLADDING.

10. WIDTH AT THE TOP OF THE STEM CAN BE

CURTAILED TO BE A MINIMUM OF 650MM.

11. NEW WALL TO HAVE A ROUNDED COPING IN

KEEPING WITH SURROUNDING FLOOD

DEFENCES

12. ALL EXISTING OUTFALLS WILL BE CARRIED

THROUGH THE NEW RIVER WALL AND WILL

BE FITTED WITH FLAP VALVES. FLAP

VALVES WILL ALSO BE FITTED ON WEEP

HOLES AS REQUIRED.

12. ORIGINAL EXISTING RIVERBED LEVEL TO BE

REINSTATED FOLLOWING CONSTRUCTION

13. DODDER FRS MAIN WORKS REFERS TO THE

PHASE 2D WORKS CURRENTLY UNDERWAY

UNDER A PREVIOUSLY GRANTED PLANNING

PERMIT

14. DIMENSIONS OF WALL FOUNDATION TO BE

CONFIRMED AT DETAILED DESIGN STAGE

LOCATION OF EXISTING CULVERT.

CULVERT APPROXIMATELY 1.5m WIDE.

LOCATION OF EXISTING CULVERT.

CULVERT APPROXIMATELY 1.5m WIDE.

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DETAIL B-B ON DRAWING

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CONFIRMED AT DETAILED

DESIGN STAGE

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EXISTING TREES TO

BE RETAINED

EXISTING TREES TO

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SLOPE OF EXISTING RIVER

WALL. SEE NOTE 7

Anglesea Road

WIDENING OF EXISTING

FOOTPATH

Anglesea Road

Herbert P

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STEM OF NEW REINFORCED

CONCRETE L-WALL

RIVER DODDER

NEW L-WALL TO TIE INTO

ABUTMENT. REFER TO

DETAIL B-B ON DRAWING

D-DR-W-2201

2

D-DR-W-2202

NEW L-WALL TO TIE INTO

ABUTMENT. REFER TO DETAIL

C-C ON DRAWING D-DR-W-2202MASONRY WALL TO TIE IN TO

EXISTING WALL ADJACENT TO

PAVEMENT. REFER TO DETAIL

D-D ON DRAWING D-DR-W-2201

EXISTING TREES TO

BE RETAINED

EXISTING TREES TO

BE RETAINED

EXISTING FLOOD

DEFENCE WALL

NEW WALL TO TIE INTO EXISTING

FLOOD WALL. REFER TO DETAIL

D-D DRAWING D-DR-W-2201

WALL FOUNDATION TO BE

CONFIRMED AT DETAILED

DESIGN STAGE

EXISTING MASONRY

WALL

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SLOPE OF EXISTING RIVER

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Drawing Title

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© Arup

Do not scale

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Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

Dodder Flood Alleviation Project

1:100

June 2018

Area 2D - RDS River Wall

Proposed Flood wall

Plan Layout Chainage 17440 - 17330

Planning

219346 D-DR-W-0203 P02

PLAN

Scale 1:100

NOTES :

P01 18/06/2018 PW BT IA

REINFORCED

CONCRETE L-WALL

EXISTING WALL

MASONRY CLADDING

FOOTPATH

Phase 2C

Phase 2C

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2. ALL DIMENSIONS IN mm UNLESS

OTHERWISE NOTED.

3. REFER TO DRAWING NO. D-DR-W-2200 FOR

TYPICAL SECTION

4. CONCRETE CLASS SHALL BE C40/50..

CONCRETE EXPOSURE SHALL BE XS2.

5. DO NOT SCALE FROM DRAWINGS, USE

FIGURED DIMENSIONS ONLY.

7. EXISTING TREES TO BE RETAINED

8. NEW WALL TO BE CLAD WITH 200mm THICK

COURSED LIMESTONE WITH LIME MORTAR

POINTING TO MATCH EXISTING

9. ORIGINAL STONE WALL WILL BE REUSED

WHERE POSSIBLE FOR THE CLADDING.

10. WIDTH AT THE TOP OF THE STEM CAN BE

CURTAILED TO BE A MINIMUM OF 650MM.

11. NEW WALL TO HAVE A ROUNDED COPING IN

KEEPING WITH SURROUNDING FLOOD

DEFENCES

12. ALL EXISTING OUTFALLS WILL BE CARRIED

THROUGH THE NEW RIVER WALL AND WILL

BE FITTED WITH FLAP VALVES. FLAP

VALVES WILL ALSO BE FITTED ON WEEP

HOLES AS REQUIRED.

12. ORIGINAL EXISTING RIVERBED LEVEL TO BE

REINSTATED FOLLOWING CONSTRUCTION

13. DODDER FRS MAIN WORKS REFERS TO THE

PHASE 2D WORKS CURRENTLY UNDERWAY

UNDER A PREVIOUSLY GRANTED PLANNING

PERMIT

14. DIMENSIONS OF WALL FOUNDATION TO BE

CONFIRMED AT DETAILED DESIGN STAGE

500mm DIA. CAST IRON FOUL SEWER

25mm DIA. UNIDENTIFIED CABLE

100mm DIA. EIRCOM CABLE

4" DIA. 25Mbar Gas

FLOOD DEFENCE LEVEL 7.1m OD MALIN

50

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2.4m

EXISTING RIVER

BED LEVEL

2.4m RIVER BED/ BASE OF WALL LEVEL

IN-SITU CONCRETE BEAM

LOCALISED SAND AND

CEMENT BAG REPAIRS

RECENTLY REPAIRED

COURSED LIMESTONE

BATTERED WALL

MIXED MATERIAL

PARAPET WALL

5.7m STREET LEVEL

EXISTING TREE TO

BE RETAINED

FOOTPATH

2800

12

90

(4

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in

)

THICKNESS VARIES FROM

600mm - 800mm

600

WALL UNDERPINNING

CURRENTLY UNDERWAY

AS PART OF DODDER FRS

MAIN WORKS

5.7m STREET LEVEL

2.4m RIVER BED LEVEL

FOOTPATH TO BE REINSTATED

TO EXISTING FINISH

FLOOD DEFENCE LEVEL 7.1m OD MALIN

RIVER BED REINSTATED TO EXISTING

LEVEL WITH AGREEMENT OF INLAND

FISHERIES IRELAND

REINFORCED CONCRETE L-WALL

EXISTING UTILITIES TO

BE RETAINED

EXISTING TREE TO

BE RETAINED

COURSED LIMESTONE CLADDING WITH

LIME MORTAR POINTING TO MATCH

SLOPE OF EXISTING WALL

8

0

°

SIZE OF FOUNDATION TO

BE CONFIRMED AT

DETAILED DESIGN STAGE

EXISTING WALL REMOVED TO

FOOTPATH LEVEL

WALL UNDERPINNING TO BE

CARRIED OUT AS PART OF

DODDER MAIN WORKS

PROPOSED WALL TO BE

DEBONDED FROM EXISTING

WALL

A1 A

9

B C D E F G H I J K L M N O P

Project No

Drawing Status

Date:

Scale at A1

Drawing No Issue

Drawing Title

Issue Date By Chkd Appd

Project TitleContractor

© Arup

Do not scale

10

8

7

6

5

4

2

1

3

Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

P01 18/06/2018 PW BT IA

Dodder Flood Alleviation Project

1:25

June 2018

Area 2D - RDS River Wall

Proposed Flood Wall

Representative Sections at Ch 17420

For Planning

219346 D-DR-W-2200 P02

NOTES :

PROPOSED REPLACEMENT L WALL IN THE RIVER

(1:50)

COMMENTARY ON PROPOSED REPLACEMENT L-WALL:

· WIDTH OF THE FOOTPATH WILL INCREASE FROM 2.8m

WIDE TO A MAXIMUM OF APPROXIMATELY 3.4m WIDE

· EXISTING TREES WILL BE RETAINED

· EXISTING SERVICES WILL BE UNAFFECTED

· EXISTING WALL TO BE REMOVED ABOVE FOOTPATH LEVEL

· NEW WALL WILL BE CLAD WITH 200mm THICK COURSED

LIMESTONE WITH LIME MORTAR POINTING

· NEW WALL WILL HAVE A ROUNDED COPING IN KEEPING

WITH SURROUNDING FLOOD DEFENCES

· ORIGINAL EXISTING RIVERBED LEVEL WILL BE REINSTATED

FOLLOWING CONSTRUCTION

· CLADDING ON ROADSIDE FACE OF WALL WILL BE ALIGNED

FLUSH WITH ADJACENT RIVER WALL

COMMENTARY ON EXISTING WALL:

· NO FOUNDATION ON EXISTING WALL

· NO SCOUR PROTECTION PRESENT

· SIGNIFICANT SETTLEMENT OF THE EXISTING WALL

· COLLAPSING CULVERT AND OUTFALL

· SPALLING AND CRACKING EVIDENT THROUGHOUT DUE TO

PRESENCE OF TREE ROOTS AND SETTLEMENT

· LOSS OF MORTAR AND LARGE STONES RECORDED

THROUGHOUT

· UPPER PARAPET HAS BECOME SEPARATED FROM THE

SETTLED LOWER WALL

· LOWER WALL WAS FOUND TO HAVE INSUFFICIENT WALL

THICKNESS AND HENCE STRUCTURAL STRENGTH OF THE

EXISTING WALL IS INSUFFICIENT TO WITHSTAND DESIGN

CONDITION

· LOSS OF MORTAR AND LARGE STONES RECORDED

THROUGHOUT

· WALLS REPAIRS WERE CARRIED OUT IN NOVEMBER 2017

AND CONSISTED OF VEGETATION REMOVAL, LOCALISED

REPOINTING AND FILLING OF SIGNIFICANT VOIDS

EXISTING RIVER WALL

(1:50)

P02 21/06/2018 PW BT IA

1. ALL LEVELS ARE IN M ABOVE O.D. MALIN.

2. ALL DIMENSIONS IN mm UNLESS

OTHERWISE NOTED.

3. REFER TO DRAWING NO. D-DR-W-0202 FOR

PLAN LAYOUT

4. CONCRETE CLASS SHALL BE C40/50..

CONCRETE EXPOSURE SHALL BE XS2.

5. DO NOT SCALE FROM DRAWINGS, USE

FIGURED DIMENSIONS ONLY.

7. EXISTING TREES TO BE RETAINED

8. NEW WALL TO BE CLAD WITH 200mm THICK

COURSED LIMESTONE WITH LIME MORTAR

POINTING TO MATCH EXISTING

9. ORIGINAL STONE WALL WILL BE REUSED

WHERE POSSIBLE FOR THE CLADDING.

10. WIDTH AT THE TOP OF THE STEM CAN BE

CURTAILED TO BE A MINIMUM OF 650MM.

11. NEW WALL TO HAVE A ROUNDED COPING IN

KEEPING WITH SURROUNDING FLOOD

DEFENCES

12. ALL EXISTING OUTFALLS WILL BE CARRIED

THROUGH THE NEW RIVER WALL AND WILL

BE FITTED WITH FLAP VALVES. FLAP

VALVES WILL ALSO BE FITTED ON WEEP

HOLES AS REQUIRED.

12. ORIGINAL EXISTING RIVERBED LEVEL TO BE

REINSTATED FOLLOWING CONSTRUCTION

13. DODDER FRS MAIN WORKS REFERS TO THE

PHASE 2D WORKS CURRENTLY UNDERWAY

UNDER A PREVIOUSLY GRANTED PLANNING

PERMIT

14. DIMENSIONS OF WALL FOUNDATION TO BE

CONFIRMED AT DETAILED DESIGN STAGE

A1 A

9

B C D E F G H I J K L M N O P

Project No

Drawing Status

Date:

Scale at A1

Drawing No Issue

Drawing Title

Issue Date By Chkd Appd

Project TitleContractor

© Arup

Do not scale

10

8

7

6

5

4

2

1

3

Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

P01 18/06/2018 VB BT IA

Dodder Flood Alleviation Project

1:50

June 2018

Area 2D - RDS River Wall

Connection details to Herbert

Park Hotel Bridge

For Planning

219346 D-DR-W-2201 P02

NOTES :

EXISTING WALL TO BE

DEMOLISHED TO

FOOTPATH LEVEL

EXISTING FLOOD

DEFENCE WALL AT

ZARDOZ COURT

TIE IN TO EXISTING

FLOOD DEFENCE WALL

AT ZARDOZ COURT

STEP IN WALL AT

FOOTPATH LEVEL

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL

PROPOSED

RC WALL

Detail A-A, Upper

at 6.0m OD Malin

Scale 1:50

~8M

~3.5M

EXISTING WALL ADJACENT

TO FOOTPATH

FOOTPATH

WIDENING

EXISTING

FOOTPATH

EXISTING

PILLAR

EXISTING FLOOD

DEFENCE WALL AT

ZARDOZ COURT

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL

PROPOSED

RC WALL

EXISTING WALL TO BE

RETAINED BELOW FOOTPATH

LEVEL

FOOTPATH

WIDENING

EXISTING WALL TO BE

DEMOLISHED TO

FOOTPATH LEVEL

PART OF DODDER FRS MAIN

WORKS, TO BE CONSTRUCTED

AFTER COMPLETION OF RDS WALL

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL

PROPOSED

RC WALL

EXISTING

FOOTPATH

LOWER CAFE WALL, LAST 20M TO BE

CONSTRUCTED AFTER COMPLETION OF

RDS WALL. COVERED UNDER EXISTING

DODDER FRS MAIN WORKS PLANNING

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL (ABOVE

GROUND LEVEL ONLY)

PROPOSED

RC WALL

EXISTING WALL TO BE

RETAINED BELOW FOOTPATH

LEVEL

PART OF DODDER FRS MAIN

WORKS, TO BE CONSTRUCTED

AFTER COMPLETION OF RDS WALL

BACKFILL TO

MATCH EXISTING

GROUND LEVELS

0,7

0,6

Detail D-D, Upper

at 6.0m OD Malin

Scale 1:50

Detail A-A, Lower

at 3.1m OD Malin

Scale 1:50

Detail D-D, Lower

at 3.1m OD Malin

Scale 1:50

BACKFILL BEHIND

EXISTING WALL

END OF EXISTING WALL

UNKNOWN

RIVER DODDER

RIVER DODDER

RIVER DODDER

RIVER DODDER

11

22

03

11

220

3

1. ALL LEVELS ARE IN M ABOVE O.D. MALIN.

2. ALL DIMENSIONS IN mm UNLESS

OTHERWISE NOTED.

3. REFER TO DRAWING NO. D-DR-W-0202 AND

0203 FOR PLAN LAYOUT.

4. CONCRETE CLASS SHALL BE C40/50..

CONCRETE EXPOSURE SHALL BE XS2.

5. DO NOT SCALE FROM DRAWINGS, USE

FIGURED DIMENSIONS ONLY.

7. EXISTING TREES TO BE RETAINED

8. NEW WALL TO BE CLAD WITH 200mm THICK

COURSED LIMESTONE WITH LIME MORTAR

POINTING TO MATCH EXISTING

9. ORIGINAL STONE WALL WILL BE REUSED

WHERE POSSIBLE FOR THE CLADDING.

10. WIDTH AT THE TOP OF THE STEM CAN BE

CURTAILED TO BE A MINIMUM OF 650MM.

11. NEW WALL TO HAVE A ROUNDED COPING IN

KEEPING WITH SURROUNDING FLOOD

DEFENCES

12. ALL EXISTING OUTFALLS WILL BE CARRIED

THROUGH THE NEW RIVER WALL AND WILL

BE FITTED WITH FLAP VALVES. FLAP

VALVES WILL ALSO BE FITTED ON WEEP

HOLES AS REQUIRED.

12. ORIGINAL EXISTING RIVERBED LEVEL TO BE

REINSTATED FOLLOWING CONSTRUCTION

13. DODDER FRS MAIN WORKS REFERS TO THE

PHASE 2D WORKS CURRENTLY UNDERWAY

UNDER A PREVIOUSLY GRANTED PLANNING

PERMIT

14. DIMENSIONS OF WALL FOUNDATION TO BE

CONFIRMED AT DETAILED DESIGN STAGE

MASONRY

TIE-IN WALL

P02 21/06/2018 VB BT IA

EXISTING SOIL

EXISTING SOIL

2.7m

7.1m

5.8m

5.9m

7.1m

3.0m

B (upper) B

NEW RC WALL WITH COURSED

LIMESTONE CLADDING TO

MATCH EXISTING

EXISTING BRIDGE

ABUTMENT WALL

TIE IN TO EXISTING WALL TO

BE BUILT UP WITH CLADDING

CANTILEVER TO

FACILITATE TIE IN TO

EXISTING WALL

APPROXIMATE RIVER

BED LEVEL

EXISTING BRIDGE

ABUTMENT WALL

CANTILEVER TO

FACILITATE TIE IN

TO EXISTING WALL

TIE IN TO EXISTING WALL TO

BE BUILT UP WITH CLADDING

HERBERT PARK HOTEL BRIDGE

B (lower) B

C (upper) C

C (lower) C

SCOUR BEAM TO BE

CONSTRUCTED AS PART OF

THE DODDER FRS MAIN WORKS

WALL FOUNDATION TO BE CONFIRMED

AT DETAILED DESIGN STAGE

A1 A

9

B C D E F G H I J K L M N O P

Project No

Drawing Status

Date:

Scale at A1

Drawing No Issue

Drawing Title

Issue Date By Chkd Appd

Project TitleContractor

© Arup

Do not scale

10

8

7

6

5

4

2

1

3

Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

P01 18/06/2018 PW BT IA

Dodder Flood Alleviation Project

N/A

June 2018

Area 2D - RDS River Wall

Connection details to Herbert

Park Hotel Bridge

For Planning

219346 D-DR-W-2202 P01

NOTES :

PROPOSED ELEVATION AT BRIDGE

NTS

EXISTING WALL TO BE

DEMOLISHED TO

FOOTPATH LEVEL

EXISTING BRIDGE

PARAPET WALL

STEP IN WALL AT

FOOTPATH LEVEL

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL

CLADDING TIE-IN TO

EXISTING WALL

EXISTING WALL TO BE

DEMOLISHED TO

FOOTPATH LEVEL

EXISTING BRIDGE

PARAPET WALL

STEP IN WALL AT

FOOTPATH LEVEL

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL

CLADDINGTIE-IN TO

EXISTING WALL

CANTILEVER TIE-IN TO

BRIDGE PAPRAPET

PROPOSED

RC WALL

PROPOSED

RC WALL

CANTILEVER TIE-IN TO

BRIDGE PAPRAPET

EXISTING WALL TO BE

RETAINED BELOW

FOOTPATH LEVEL

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL

SCOUR BEAM UNDER BRIDGE

TO BE CONSTRUCTED AS PART

OF DODDER FRS MAIN WORKS

PROPOSED

RC WALL

Detail B-B, Upper

at 6.0m OD Malin

Scale 1:50

Detail B-B, Lower

at 3.1m OD Malin

Scale 1:50

Detail C-C, Upper

at 6.0m OD Malin

Scale 1:50

Detail C-C, Lower

at 3.1m OD Malin

Scale 1:50

~10M

~11M

APPROXIMATE TOE OF

EXISTING WALL

EXISTING WALL TO BE

RETAINED BELOW

FOOTPATH LEVEL

COURSED LIMESTONE

CLADDING TO MATCH

EXISTING WALL

PROPOSED

RC WALL

APPROXIMATE TOE OF

EXISTING WALL

CLADDING TIE-IN TO

EXISTING WALL

SCOUR BEAM UNDER

BRIDGE TO BE

CONSTRUCTED AS PART OF

DODDER FRS MAIN WORKS

CLADDING TIE-IN TO

EXISTING WALL

RIVER DODDER

RIVER DODDER

RIVER DODDER

RIVER DODDER

22

22

03

EXISTING SOIL

EXISTING SOIL

1. ALL LEVELS ARE IN M ABOVE O.D. MALIN.

2. ALL DIMENSIONS IN mm UNLESS

OTHERWISE NOTED.

3. REFER TO DRAWING NO. D-DR-W-0202 AND

0203 FOR PLAN LAYOUT

4. CONCRETE CLASS SHALL BE C40/50..

CONCRETE EXPOSURE SHALL BE XS2.

5. DO NOT SCALE FROM DRAWINGS, USE

FIGURED DIMENSIONS ONLY.

7. EXISTING TREES TO BE RETAINED

8. NEW WALL TO BE CLAD WITH 200mm THICK

COURSED LIMESTONE WITH LIME MORTAR

POINTING TO MATCH EXISTING

9. ORIGINAL STONE WALL WILL BE REUSED

WHERE POSSIBLE FOR THE CLADDING.

10. WIDTH AT THE TOP OF THE STEM CAN BE

CURTAILED TO BE A MINIMUM OF 650MM.

11. NEW WALL TO HAVE A ROUNDED COPING IN

KEEPING WITH SURROUNDING FLOOD

DEFENCES

12. ALL EXISTING OUTFALLS WILL BE CARRIED

THROUGH THE NEW RIVER WALL AND WILL

BE FITTED WITH FLAP VALVES. FLAP

VALVES WILL ALSO BE FITTED ON WEEP

HOLES AS REQUIRED.

12. ORIGINAL EXISTING RIVERBED LEVEL TO BE

REINSTATED FOLLOWING CONSTRUCTION

13. DODDER FRS MAIN WORKS REFERS TO THE

PHASE 2D WORKS CURRENTLY UNDERWAY

UNDER A PREVIOUSLY GRANTED PLANNING

PERMIT

14. DIMENSIONS OF WALL FOUNDATION TO BE

CONFIRMED AT DETAILED DESIGN STAGE

P02 21/06/2018 PW BT IA

5.7m STREET LEVEL

FLOOD DEFENCE LEVEL 7.1m OD MALIN

PROPOSED WALL TO

TIE IN TO BRIDGE

PARAPET

RIVER BED REINSTATED TO

EXISTING LEVEL WITH

AGREEMENT OF INLAND

FISHERIES IRELAND

750mm

See Note 10

REINFORCED

CONCRETE

L-WALL

2.4m RIVER BED/ BASE

OF WALL LEVEL

2800

EXISTING

UTILITIES TO BE

RETAINED

34

20

12

80

COURSED LIMESTONE

CLADDING WITH LIME

MORTAR POINTING. SLOPE

TO MATCH EXISTING WALL

14

30

(4

ft 8

in

)

400

8

0

°

~960

WALL UNDERPINNING

CARRIED OUT AS PART OF

DODDER FRS MAIN WORKS

WALL FOUNDATION

TO BE CONFIRMED

AT DETAILED

DESIGN STAGE

FOOTPATH TO BE

REINSTATED TO

EXISTING FINISH

~550

EXISTING

FOOTPATH

+5.47m

300

650

+2.40m RIVER BED LEVEL

+2.75m APPROX LOW WATER LEVEL

REINFORCED

CONCRETE L-WALL

+4.32m

BACKFILL TO TIE IN

WITH TOP OF MASS

CONCRETE WALL

PART OF DODDER FRS

MAIN WORK, TO BE

CONSTRUCTED AFTER

COMPLETION OF RDS WALL

+5.64m

1360

FOUNDATION DETAIL

OF TO BE CONFIRMED

AT DETAILED DESIGN

STAGE

ASSUMED

FOUNDATION OF

EXISTING WALL

COURSED LIMESTONE

CLADDING WITH LIME

MORTAR POINTING

EXISTING

UTILITIES TO BE

RETAINED

FLOOD DEFENCE LEVEL 7.1m OD MALIN

A1 A

9

B C D E F G H I J K L M N O P

Project No

Drawing Status

Date:

Scale at A1

Drawing No Issue

Drawing Title

Issue Date By Chkd Appd

Project TitleContractor

© Arup

Do not scale

10

8

7

6

5

4

2

1

3

Clients Consultant

Arup, 50 Ringsend Road

Dublin 4

Tel +353(0)1 233 4455 Fax +353(0)1 668 3169

www.arup.ie

Key Plan

©

DUBLIN CITY COUNCIL

Comhairle Cathrach Bhaile Atha Cliath

ENVIRONMENT AND ENGINEERING DEPARTMENT

An Roinn Comhshaoil agus Innealtoireachta

Civic Offices,

Wood Quay,

Dublin 8.

FOR PLANNING

P01 18/06/2018 VB BT IA

Dodder Flood Alleviation Project

N/A

June 2018

Area 2D - RDS River Wall

Connection details to Herbert

Park Hotel Bridge

For Planning

219346 D-DR-W-2203 P02

NOTES :

SECTION 1-1 (CAFE WALL JUNCTION DETAIL)

Scale 1:50

SECTION 2-2 (BRIDGE CONNECTION DETAIL)

Scale 1:50

P02 21/06/2018 PW BT IA

1. ALL LEVELS ARE IN M ABOVE O.D. MALIN.

2. ALL DIMENSIONS IN mm UNLESS

OTHERWISE NOTED.

3. REFER TO DRAWING NO. D-DR-W-2201 AND

2201 FOR SECTION LOCATIONS.

4. CONCRETE CLASS SHALL BE C40/50..

CONCRETE EXPOSURE SHALL BE XS2.

5. DO NOT SCALE FROM DRAWINGS, USE

FIGURED DIMENSIONS ONLY.

7. EXISTING TREES TO BE RETAINED

8. NEW WALL TO BE CLAD WITH 200mm THICK

COURSED LIMESTONE WITH LIME MORTAR

POINTING TO MATCH EXISTING

9. ORIGINAL STONE WALL WILL BE REUSED

WHERE POSSIBLE FOR THE CLADDING.

10. WIDTH AT THE TOP OF THE STEM CAN BE

CURTAILED TO BE A MINIMUM OF 650MM.

11. NEW WALL TO HAVE A ROUNDED COPING IN

KEEPING WITH SURROUNDING FLOOD

DEFENCES

12. ALL EXISTING OUTFALLS WILL BE CARRIED

THROUGH THE NEW RIVER WALL AND WILL

BE FITTED WITH FLAP VALVES. FLAP

VALVES WILL ALSO BE FITTED ON WEEP

HOLES AS REQUIRED.

12. ORIGINAL EXISTING RIVERBED LEVEL TO BE

REINSTATED FOLLOWING CONSTRUCTION

13. DODDER FRS MAIN WORKS REFERS TO THE

PHASE 2D WORKS CURRENTLY UNDERWAY

UNDER A PREVIOUSLY GRANTED PLANNING

PERMIT

14. DIMENSIONS OF WALL FOUNDATION TO BE

CONFIRMED AT DETAILED DESIGN STAGE

Appendix B

Photographs

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Page B1

B1 Photographs

River Dodder Flood Alleviation Works 2D – RDS Wall

Appendix B Site photographs and examples of proposed construction methodology for the proposed

development.

Photo 1: Works area No. 1. River crossing from the left bank, upstream of Herbert Park Lane

bridge and works area No. 1. | Photo taken April 2018.

Photo 2: Works area No.2. Right bank downstream of the Herbert Park Lane Bridge. | Photo taken

April 2018.

Photo 3: Works area No.1 access point and haul road | Photo taken April 2018.

Photo 4: Works area No.1: Upstream of Herbert Park Lane bridge. | Photo taken April 2018.

Photo 5: Example of ‘Kelly blocks’ used to shutter base of concrete wall for concrete pour. Note –

this photo is for illustration only, it does not represent the exact layout of the proposed works.

Photo 6: Example of methology for concrete pour using bucket and excavator. Note – this photo is

for illustration only, it does not represent the exact layout of the proposed works.

Photo 7 Example of temporary piles installed in the haul road during works. Note – this photo is for

illustration only, it does not represent the exact layout of the proposed works.

Photo 8 Example of a trench box during construction of the shear key. Note – this photo is for

illustration only, it does not represent the exact layout of the proposed works.

Appendix C

Finding of No Significant

Effects Report

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Page C1

C1 Finding of No Significant Effects Report

Name of Project:

River Dodder Flood Alleviation Works 2D – RDS Wall

Names of Natura 2000 Sites of relevance to the proposed scheme:

Wicklow Mountains SAC (Site Code 002122) is considered to be of relevance in

this report due to the qualifying interest (QI) species of the SPA and the indirect

connection with the works site as a habitat. The Wicklow Mountains SAC is

approximately 10.4km overland or 20km downstream of Dodder tributaries within

the SAC, from the proposed development works site. Otters are a QI species to the

Wicklow Mountains SAC and though uncommon, are known to travel large

distances outside their territory to feed.

The following downstream Natura 2000 sites are considered of relevance to this

report due to the hydrological connection between the proposed development and

the site:

South Dublin Bay and River Tolka Estuary SPA (Site Code 004024),

approximately 4.6km downstream from the proposed development.

North Bull Island SPA (Site Code 004006), approximately 7.2km downstream

from the proposed development.

South Dublin Bay SAC (Site Code 000210), approximately 4.6km

downstream from the proposed development.

North Dublin Bay SAC (Site Code 000206), approximately 6.8km

downstream from the proposed development.

These four Natura 2000 sites are characterised as coastal habitats including mud

flats, wetlands, intertidal flats, sand flats and areas of shallow water. These

habitats provide areas suitable for feeding, nesting and feeding in the sheltered

shallow waters and organic rich mudflats. These sites are significant for wintering

birds that use the sites.

Is the project or plan directly connected with or necessary to the

management of the site?

No

Are there other projects or plans that together with the project or plan being

assessed could affect the site?

No

THE ASSESSMENT OF SIGNIFICANCE OF EFFECTS

Describe how the project or plan (alone or in combination) is likely to affect

the Natura 2000 site.

It has been determined by Arup that it is possible to rule out likely significant

impacts on any Natura 2000 sites.

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Page C2

Explain why these effects are not considered significant.

The ecological survey conducted in May 2018 concluded that there is no

evidence of otter holts within the works area or in proximity to the works site.

The proposed development is within the feeding range for otters from the

Wicklow Mountains SAC however, 20km downstream is considered in the

upper threshold of this feeding range.

The proposed works are unlikely to disturb otter species that have the potential

to travel downstream from the Wicklow Mountains SAC (site code 002122),

where they are a QI species. The ecological survey (May 2018) has concluded

that there is no evidence of otter holts within or in proximity (200m up and

downstream). Any individual otters that use the River Dodder within or in

proximity to the works area are likely to be present outside construction hours

due to the time of day the species is known to be most active (early mornings

and evenings). Reports of otters present within the proposed development

works area (including haul roads) during previous flood alleviation works

suggests that the species continues to use the site despite construction

activities and alterations to the river channel i.e., haul roads.

The Natura 2000 sites downstream are not sensitive to sediment loading and

are all located in estuarine/ tidal areas in Dublin Bay which are subject to large

diurnal tidal flows carrying substantial volumes of sediment. Any habitats or

species in these areas are well used to varying levels of salinity, flows and

suspended solids. The distance between the proposed development works area

and the closest downstream Natura 2000 sites (4.6km) further reduces the risk

of any significant impact if sediment loading or pollution (e.g. fuel spill) was

to occur. This distance, combined with the considerable assimilative capacity

of Dublin Bay means that the level of suspended solids from the proposed

works which could possibly end up in the Dodder and downstream in the Bay

will not have a significant impact on these Natura 2000 sites.

There will be some noise emissions but these will be on par with the

surrounding urban environment and traffic noise. Dust emissions generated

during demolition of the wall however, these will be limited as these works

will be conducted in stages.

List of Agencies consulted

Inland Fisheries Ireland

DATA COLLECTED TO CARRY OUT THE ASSESSMENT

Who carried out the assessment?

The assessment was carried out by an Arup ecologist.

The ecological survey was carried out by Brian Keeley, ecologist of Wildlife

Surveys Ltd.

Sources of Data -

Sources of data included:

Dublin City Council River Dodder Flood Alleviation Works 2D – RDS Wall

Report for Screening for Appropriate Assessment

219346-00 | Issue 3 | 10 July 2018 | Arup

Page C3

Ordnance Survey of Ireland mapping and aerial photography (www.osi.ie) (viewed on 10 May 2018);

Bing aerial photography (viewed on 10 May 2018);

National Parks and Wildlife Service online data on European Sites and (www.npws.ie) (data downloaded on 10 May 2018);

National Parks and Wildlife Service online data on protected flora and fauna (viewed on 10 May 2018);

Information on environmental quality data available from the EPA’s map viewers, Envision Online Environmental Map Viewer (https://gis.epa.ie/EPAMaps/) and www.catchments.ie (viewed on 10 May 2018);

Dublin City Development Plan 2016-2022

Dublin City Development Plan 2016-2022 Appropriate Assessment Screening Report

Dublin City Biodiversity Action Plan 2015-2020

Dodder Greenway Ecological Impact Assessment (June 2017) Roughan & O’Donovan Consulting Engineers for South Dublin County Council

OVERALL CONCLUSIONS

Based on the information provided above, and by applying the precautionary

principle, it has been determined by Arup that it is possible to rule out likely

significant impacts on any Natura 2000 sites and therefore it is the view of Arup

that it is not necessary to undertake any further stage of the Appropriate

Assessment process.

Appendix D

Ecological Survey Report

Dodder Ecological Survey In Advance of Alterations to the Flood Relief Wall at Herbert Park,

Ballsbridge, Dublin 4

Brian Keeley B.SC. (Hons) in Zool. MCIEEM June 2018

Project background:

Approximately 200m of the west river wall along Anglesea Road from Ballsbridge to an area

immediately upstream of Herbert Park Lane bridge requires a new reinforced concrete L-wall to be

built. The existing wall will be removed to footpath level and new wall will be built in front of this. It

is proposed that the proposed works will be carried out under a Part 8 planning application as per

the Planning and Development Regulations 2001-2015, as amended, as part of the overall River

Dodder Flood Alleviation Works Phase 2C-2E.

This assessment examines the potential for the following protected species within or adjacent to the

site and discusses the potential for disturbance to these species from the proposed works: otter,

badger and kingfisher.

Otter Ecology

The otter is a mammal within the order Carnivora and the family Mustelidae related to the badger,

stoat and pine marten (and introduced American mink). Ireland has remained a refuge for otters

through a period when they disappeared from huge areas of Europe. However, this slowing in the

decline of this species in Ireland should not be cause for complacency. In previous surveys across the

island, positive signs of their presence have been found in up to 92% of sites.

A number of subsequent national surveys of otters have been conducted in the Republic of Ireland.

In 1980/81 otter signs were noted at 88% of the sites surveyed. In 1990, otter presence decreased to

75%. The population is estimated to be 10,000 adults (Vincent Wildlife Trust) or up to 12,000

(National Parks and Wildlife Service). The favourable reference population is set at 6464 female

otters, a 10.2% increase on the 2009 level estimated by NPWS. Thus, there is a perceived need in the

Threat Response Plan drawn up by NPWS to improve the conditions for otters.

In the Netherlands, otters became extinct in 1988 and otters disappeared in Belgium, Luxembourg

and Liechtenstein also. Swiss extinction was averted by the introduction of otters from Bulgaria. In

Germany, otters survived best in the former East German state due to lower intensification of

agriculture and industry and the presence of large hunting estates. In England, otters dwindled to a

number of individuals.

By 2015, otters had returned to much of the lost range including England and the Netherlands. The

importance of populations such as those of Ireland has been highlighted by the Council of Europe as

being a vital link in protecting the future of this species. The protection of otters is enhanced by the

inclusion of this species within the list of species requiring special protection measures including

Special Areas of Conservation under Annex II of the Habitats Directive. This provides otters with the

same level of protection as lesser horseshoe bats; found only in the west and south of the island.

This alone identifies the presence of otters in urban areas as a highly significant element of European

biodiversity and conservation measures.

Otters live a mainly aquatic-dependent life, feeding and commuting along rivers, canals, lakes as well

as travelling across land and living along the seashore. In Dublin, rivers and canals are the most

common sites while some lakes (natural and artificial) are also used to feed and shelter.

Otters live in underground burrows (holts) often excavated around tree roots in riverbanks or

burrows of other mammals such as badger setts, fox earths or rabbit warrens.

Otter may also rest above ground in long grass or scrub (including rhododendron, reeds etc.). They

have even been known to clamber on to boats to sleep.

Otters feed mostly on bottom-dwelling fish but will also eat frogs, crayfish, birds, small mammals

and in coastal areas, crabs and marine fish and invertebrates.

Otters are relatively large in terms of Irish mammals with an overall length of 1.2 metres for adult

males and 1 metre for females. Males may weigh around 10 kg (7-16 kg) while females are lighter (7

kg (5-9 kg)).

Otters are solitary and while there may be a loosely affiliated group of females (probably genetically

related to each other) in a single feeding area, males and females do not associate except to mate.

Where more than one otter is seen, it is usually a female and her cubs or the siblings of a litter.

Females establish and protect core areas within the overall territory to breed and other females will

not enter lightly into this area. Males may range over enormous distances with the larger territories

for this species being 80 km of stream.

The otter pregnancy is short; lasting on average 63 days. In comparison, the American mink may

have a spring pregnancy of between 39 and 76 days with shorter pregnancies in late spring. Otter

young are more commonly born in spring or summer in Ireland but throughout their range, otter

cubs may be born at any time in the year.

The natal holt (breeding holt) may be near or far from water and may show no distinctive features to

denote its greater significance in the ecology of this species. There are typically fewer spraints close

to natal holts. Holts may be very simple in freshwater areas but in coastal areas, they may have an

extensive network of tunnels usually 10 to 20 metres in length.

Bedding is introduced to line some of the chambers. Often, there are small pools of fresh water

within holts where freshwater is a limiting factor. The two to three young are born blind and covered

in fur and are suckled for 14 weeks. Solid food starts at 7 weeks. The first swim is at 12 weeks. By 16

weeks, the cubs leave on swimming trips with the mother. The young remain with the mother for 10

months with increasing independence in the last two months.

Otters may range over tens of kilometres with males travelling further than females and all

overlapping the territories of other individuals. Ranges of up to 48 km have been noted for males

but more commonly 20 km and upwards and this brings them into several female group areas. Much

of the information on otters comes from Scottish studies where otters appear to travel further.

Based on Irish studies, females may have home ranges of 7.5 km to 9 km and this is inversely related

to river width.

Otters are very short-lived in the wild with males living on (an European) average 3 years and

females up to 3.6 years. In Ireland, they may live up to 5 years on average. Captive otters can live up

to 15 years and a record of a wild 16 year old female is known from Scotland.

The main risks that otters face in terms of survival include habitat loss, pollution, availability of prey,

road-kill, conflict with fish farmers and gamekeepers and water quality. The three categories habitat

loss, water pollution and illegal and unintentional killing make up almost 75% of the major threats

with habitat loss being the principal threat. River and wetland drainage and Pollution (organic and

industrial) have similarly considerable impacts (17%, and 14% each respectively).

Interruption to an otter’s movement along a river or canal may lead to the individual entering public

roads. This may in turn lead to fatality. In the urban setting, roads are clearly a major challenge while

the presence of many dogs close to their feeding areas and especially their holts may pose a major

risk. In coastal areas, fishing nets may be a major risk while on rivers and canals, fishing line and

hooks may lead to serious injury. Along the River Dodder between Donnybrook and Ballsbridge,

illegal fishing may create some disturbance. But since the commencement of works upon the Flood

Alleviation programme for Dublin City along the Rover Dodder, there has been considerable

disturbance from partial damming of the river, the construction of temporary pontoons and bridges,

construction equipment, human activity, the operation of pumps, generators, lighting in addition to

stonemasonry associated with walls and bridges. These unavoidable activities (to provide safety for

the human population of the area) add to the usual disturbances faced by urban otters.

Otters have been recorded from numerous locations along the Dodder and Grand Canal and are

present in Grand Canal Dock and Basin and where the Dodder meets the River Liffey. Otters have

historically been recorded at O’Connell Bridge and have been photographed at Lansdowne New

Bridge. Sightings for the species include a new rock embankment downriver of Ballsbridge, an access

track opposite Ballsbridge library, the riverbank close to the Dunluce apartments, Smurfit’s Weir

upriver of Donnybrook Bridge. Reports from Waterways Ireland and from Conservation Ranger Terry

Doherty indicate that otters are present within Grand Canal Dock and are breeding here. Discussions

with residents close to Grand Canal Basin also indicate that otters were resident close to a former

naval vessel.

Previously otter spraints have been noted at Grand Canal Dock, the riverbank close to Ballsbridge

library, lock gates along the Grand Canal and within Grand Canal Basin.

Examinations of the riverbank behind Dunluce apartments site in 2015 provided evidence of an otter

holt at this time. However, this was washed away by drainage carried out within the apartments.

Badger Ecology

There is some overlap in the ecology of badgers and otters given their relatedness (as mustelids),

and their creation of burrows within which to rest. This digging is much more advanced and essential

to badgers and the dwelling place (sett) is of huge significance. Badgers do not travel over the same

distances as otters (in particular male otters) and the setts are probably more faithfully used and

maintained. Badgers may establish substantial setts that may have dozens of tunnels and chambers

and with tens of entrances. In an area such as Ballsbridge or Donnybrook or other urban areas, there

may be a greater restriction on the size of sett, the size of territory and the number of badgers.

However, supplementary feeding and exploitation of leftovers and waste may reduce the area

required to sustain badgers. Discussions with residents disclosed that badgers in the area are given

scraps and have been recorded on surveillance cameras to scramble over walls into gardens. Digging

within Herbert Park on football pitches was reported by one resident.

Badgers within this area are known to have established setts within the Dunluce property, within the

grounds of the Licensed Vintners Association, in the grounds of Old Wesley Rugby Club and may be

present over a wider area in surrounding gardens.

Kingfisher Ecology

The kingfisher is an iconic bird species that is well regarded by all but only rarely seen by most. The

population in Ireland is Amber-listed and BirdLife International considers the European population to

be depleted. This species is very sedentary in its habits and would not be long-distance traveller or

migrator. The species avails of vertical banks along streams and rivers to excavate a near-horizontal

tunnel to nest and rear the annual brood. In some areas, a second brood may also be hatched up to

700 metres from the first in a new tunnel. In an extensive study undertaken by the OPW, kingfisher

nests were found predominantly in clay banks (as opposed to sand) or tall vertical loamy banks. This

species is dependent upon a supply of species of small fish such as stickleback, minnow, chub as well

as larger aquatic invertebrates.

Hunting is usually done from an overhanging branch followed by a dive on to the prey and capture

under water. The adult can align several fish in its beak to return to feed the young in the tunnel.

Survey Methodology:

The site as shown in Figure 1 was examined on 23rd May 2018 and was supplemented by

observations prior to this evaluation and also subsequent to it on 25th May 2018. Surveying involved

a thorough inspection of all accessible areas from both riverbanks to identify the presence of otter

or badger signs or holts or setts respectively and the potential for the presence of kingfisher nests or

suitable sites for such nests. The river was examined upriver and downriver of the site to a distance

of 200 metres (minimum) for all of the above signs. Where residents were encountered along the

riverbank, they were questioned on observations of these species. Any other records from

discussions with residents are also included within this report.

Results of surveys for otters, badgers and kingfisher

Otters

There were no otter holts noted within Site 1 or Site 2. There were a number of otter prints that

were less than one week old in Site 1 and it is clear that this species enters the site on a regular

basis. In November 2017, two otters were noted to take cover within a rockpile that formed part of

the access track for OPW equipment level with Ballsbridge library by OPW staff.

Otter prints were noted on the shoreline behind the Dunluce apartments and the Merrion Cricket

Club. An otter was seen in the area beyond Site 1 and level with Site 2 to the rear of Dunluce

apartments within one month of the survey (mid-April). Otters have been noted on an occasional

basis emerging from and standing on rocks on the west bank downriver of Ballsbridge north of the

proposed compound (currently in use as a compound for other flood relief operations.

Otters are noted south of the site at Donnybrook close to Smurfit’s Weir as well as north of the site

where the Dodder joins the River Liffey.

Overall, this area is regularly used by otters but no holts were noted within the area that will be

directly affected by the proposed operations.

Discussions with local wildlife watchers and residents indicates that otters are also regularly seen in

the Milltown to Dartry Park area and holts have been noted in this area. Holts have been reported

along the Greenway route but the presence of otters at these holts was not confirmed.

Badgers

There were no signs of badgers within the site. Badger setts and some evidence of activity were

noted within the LVA grounds, at Old Wesley and a sett was noted close to Anglesea (Donnybrook)

Bridge. This species was reported to visit Herbert Park and has been recorded on camera as still

present at the LVA to the south of the proposed construction site.

Badgers will not be affected by the proposed work.

Kingfisher

There is no suitable river bank within the proposed construction site. No kingfishers were noted on

23rd or 25th May 2018. Kingfisher observations within this stretch have been scarce during

examinations of the river between 2015 and 2018 and discussions with local residents and nature

watchers identify the upriver section of the river as the area known for nesting by this species. The

main area of interest is at Dartry Park and a kingfisher nest was present here in 2017.

Summary of findings

There were no otter holts, badger setts or kingfisher nests within the areas within which the

construction work will be undertaken. There are therefore no direct risk to these protected species

from the proposed work. There will be no loss of dwelling places or protected structures sheltering

these species.

At present, there is constant construction work in the area around Ballsbridge that includes hugely

intrusive operations such as cutting stone with an angle grinder, movement of stones, wall

construction etc. with which the otters in this area have been dealing for over 2 years. The otter holt

provided to the rear of Dunluce has not been occupied to date. The otter holt at Lansdowne, to the

rear of the Aviva Stadium was used prior to 2015 and may be used occasionally but is not in constant

use.

Otters are potentially occupying the rocks placed along the west riverbank approximately 190

metres from the edge of the site and have been seen to hide within rocks within the site when

disturbed.

Badgers have been consistently in areas upriver of the proposed work and are not directly affected

by the works.

Kingfishers are even further upriver towards Milltown and on to Rathfarnham. This species will not

be directly affected on a daily basis and there is very limited impact, if any, upon feeding on a daily

basis.

The habitats within which the works will take place are:

FW2 Depositing/lowland river

BL1 Stone walls and other stonework

BL3 Buildings and artificial surfaces

The riverbank on the west side, south of the hotel holds a Treeline WL2. To the rear of the works

there is Amenity grassland (improved) GA2. The river bank towards the RDS side (east) holds Mixed

broadleaved/conifer woodland WD and amenity grassland GA2 as well as BL1 and BL3 (built

environment).

Recommendations

It is clear that the only species of the three discussed in this report potentially affected by the

proposed work is the otter. This species is not present within the site but is clearly a regular visitor to

the area and may avail of lands adjacent to the site as resting places.

The ongoing operations along this section of the Dodder and including the bridge to Herbert Park

Hotel are intrusive but are being tolerated by the local otters. It is likely that the continuing work will

be no more intrusive than previous and current operations.

It is proposed that a licence to disturb is not required given that this work will not encroach upon

any holts, setts or kingfisher nests.

Otter signs along the River Dodder close to the

proposed operations at Ballsbridge, Dublin 4

Legend

1. Artificial otter holt

2. Artificial otter holt

3. Regular Otter Sightings

4. 2 otters seen November 2017

5. Otter holt destroyed during drainage by

construction company

6. Artificial otter holt

Area within which construction works will

occur

Compound for construction

5

6

3

4

1

2

3

4

5

6

Otter spraints and paw prints within the proposed site

Otter spraints and paw prints within the proposed site

Considerable construction and operations at and around the proposed works crating a disturbance but still visited by otters

Otter spraints and paw prints

Badger setts and tracks upriver of the site

Badger setts and tracks upriver of the site

Badger setts and tracks upriver of the site

Badger setts and tracks upriver of the site

Examples of banks with kingfisher nests (not along the River Dodder)