Location: , Co. Unique ID: 260451 (from PFRA database) Initial OPW Designation APSR AFRR IRR Co-ordinates Easting: 184,750 Northing: 231,999 River / Catchment / Sub-catchment Bunowen River & Deer Park River / Type of Flooding / Flood Risk Fluvial non-tidal Fluvial tidal Coastal (identify all that apply)

Stage 1: Desktop Review River Flow Path 1.1 Flood History The Bunowen and Deer Park Rivers confluence with the River Suck (include review of immediately north of Ballinasloe, which then flows through Ballinasloe in a Floodmaps.ie) south-easterly direction. River tributaries are also located within the town’s boundary.

The River Suck has historically been re-directed to flow to the east of the town centre, away from its original course which passed to the immediate east of the town centre. The former course of the River Suck, which is now a much smaller watercourse, is crossed by the R446 (Church Street), the R446 (Bridge Street), the R348 (Bridge Street), road near St Michael’s Square and by a railway line to the north.

Flood Event Records There are records of 13 flood events in the vicinity of the town, including events in 1954, 1995, 1999, 2002, 2005 and 2009.

PFRA database comments (in italics): 1.2 Relevant information on OPW comments flooding issues from Designated APSR on the basis of predictive analysis. (Combined score 315.2 OPW and LA staff + 172.2 = 487.4.)

LA comments 100 premises flooded-People evacuated-Scheme planned-N18 flooded- November 2009, 2006 (Not to

Meeting / discussion summary comments:

OPW comments • The town flooded in November 2009 • A Heritage Report has been developed by the County Council, which proposes that the sluice gates on the old N6 road bridge be retained for Industrial Heritage reasons. These sluice gates significantly reduce the conveyance capacity of the old N6 bridge. • Minor works have been completed, comprising the construction of a bypass route along the old mill race. Also new culverts are proposed beneath the old N6, funding has been granted for this work. • The main responsibility for maintenance works etc. would lie with the Sub-Drainage Committee.

Flood Risk Review Report – UoM 25/26 Ballinasloe V0_A 1

LA comments • A Minor Works scheme is currently nearing completion in the upper section of the River Suck corridor within the town. This area has suffered repeated flooding for the past 25 years. The area benefiting from the scheme is upstream of the railway line on the right bank, where risk comes from both Deer Park River and River Suck. The height of the proposed flood defences are the November 2009 flood levels plus freeboard allowance. • The middle section of the River Suck corridor (downstream of the railway bridge on the right bank) flooded in 2009. However, there is not a sufficient economic case for undertaking works here immediately. • The lower section, including the town centre, also flooded in November 2009. Flooding was sourced from the River Suck, which backed up along the former route of the river, flooding St Michael’s Square and rising up to the threshold level of the Galway CoCo building. The cause of the flooding was the restriction of flows under the old N6. Since 2009, a bypass channel has been reintroduced along the route of an old mill race, including the cleaning out of old relief culverts under the old N6. Two further new relief culverts (6.00m width x 2.00m height) are currently proposed by Galway CoCo beneath the old N6, an application to OPW has been made for funding for these works. As a 1.00m head loss was observed across the old N6 during the 2009 event, and that backing up from the N6 was the primary cause of flooding here in 2009; the Local Authority is hoping to obtain funding to complete these works as a priority.

1.4 PFRA Data

1.4.1 PFRA hazard PFRA mapping available in GIS layer: Yes No mapping PFRA mapping included on FRR map: Yes No

1.4.2 Summary of Type FRI score Principal Receptors (if available) WTP_Loc 2.5

Monument_LV 13

TOTAL 487.4

1.7 Stage 1 Aspect Clearly APSR Uncertain Evaluation Flood History (1.1) X OPW / LA Information (1.2) X PFRA Evaluation (1.4) X Overall Desktop Evaluation (if any above aspect is uncertain X then overall designation is uncertain)

1.8 Proposed level of Level A Site Visit assessment for Stage 2 site visits Level B Site Visit X

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Stage 2: Site Inspection Level B Assessment

Date and Time of Inspection Date: 26/05/11 Time: 12:30

Names of inspection team Alan Dew (including OPW/LA staff if present) Peter Smyth

2.3 Local No on-site comments knowledge - on-site comments (OPW, LA and any info volunteered by local residents during visit)

2.4 Comments on The sluice gates on the old N6 bridge significantly reduce conveyance capacity hydraulic during high flows. constrictions The railway line upstream of the town centre may provide constraint to high (bridges, etc.) and flows. conveyance routes There are 2 Armco culverts beneath the roadway adjacent to Galway CoCo building along route of original River Suck which may provide a constraint at times of high flows.

2.6 Defence Assets Formal and Open Channel Watercourses Informal Flood Man-made river channel Flood relief channel Canal Defence Assets Mill leat Drainage channels / back drains (include effective and ineffective Bridges and Culvert crossings assets to inform Single Arch bridge Multi-Arch bridge asset survey and Single Span bridge Multi-Span bridge potential Box culvert(s) Pipe culvert(s) Arch Culvert(s) mitigation measures) Culverted Watercourses (culvert length is greater than just a crossing) Box culvert(s) Pipe culvert(s) Arch Culvert(s) Irregular Culvert(s) Walls and Embankments Embankment(s) Raised wall(s) Retaining wall(s) Control Structures – weirs, gates, dams Fixed crest weir Adjustable weir Dam / Barrage Sluice gates Lock gates Radial gates Storage On-line storage (natural) On-line storage (artificial) Off-line storage Outfalls Flapped outfall(s) into watercourse Unflapped outfall(s) into watercourse i.e. from smaller watercourses, drains etc. into river / estuary / sea Tidal flap(s) Tidal sluice(s) i.e. from main watercourse into estuary / sea

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Other Pumping Station Erosion Protection Sand Dunes Additional notes (if required): Flood defence walls and embankments are currently construction (OPW funded scheme in the upper section of the town).

2.8 Initial Potential Mitigation Measures

Non-structural Planning and Development control measures Sustainable Urban Drainage Systems Flood forecasting / warning Change in Operating Procedures for water level control: Public awareness campaign Individual property protection Land use management Structural Strategic development management for floodplain development: measures (integration of measures into strategic development proposals) Storage: On-line Off-line Flow diversion: Flood relief channel Flood relief culvert Increase conveyance: Bridge works Channel works Floodplain Flood defences: Walls Embankments Localised works: Defence raising In-fill gaps Trash screen Maintenance works: Culvert / channel clearance Asset maintenance Relocation of properties: Improve existing defences: (describe)

Other (describe):

Outcomes

Recommended APSR not an APSR IRR Designation Summary Comments Ballinasloe has a history of flooding. The PFRA mapping predicts an (if required) ongoing significant flood risk with this conclusion supported by both the Local Authority and the OPW. Ballinasloe was confirmed as an APSR following a desk based assessment, with no on-site verification required.

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Photo1: Looking downstream of the road Photo 2: Old N6 road bridge over the bridge adjacent to the OPW flood River Suck from the upstream left bank. alleviation scheme (nearing completion) in Note the sluice gates beneath the bridge the upper section of Ballinasloe. parapets.

Photo 3: Flood relief channel for the River Photo 4: Former course of the River Suck Suck constructed along the former mill looking upstream. race, looking towards the old N6 from upstream.

Flood Risk Review Report – UoM 25/26 Ballinasloe V0_A 5 180500 181000 181500 182000 182500 183000 183500 184000 184500 185000 185500 186000 186500 187000 187500 188000 188500 189000 189500 190000 Ballinasloe 0 0 0 5 3 2 0 0

5 4

3 ± 2 0 0 0 4 3 2 0 0 5 3 3 2 0 0 0 3 3 2 Legend 0

0 APSR Boundary Rail Network 5

2 for CARs only 3 Roads 2 Historic Flooding () @! @ Incidents

0 Airport Land 0

0 Water bodies mapped 2 OPW Embankments 3

2 from RADARSAT-2 * Historic Flood Data Hydrometric Gauging !H G Architectural Heritage 0 ! Stations 0 5

1 ^_ UNESCO Sites

3 EPA River Network 2 !R Rail Stations Special Protection Area Special Area for 0 N 0 ! Nursing Homes

0 Conservation 1 3

2 Residential Care N Proposed National ! for the Elderly Heritage Area

0 E National Heritage Area 0 ! Schools 5 0

3 ] Benefiting Lands 2 ! Ports and Harbours Flood Extents (PFRA, 2010) !O OPW Buildings

0 10% AEP Flood Extent 0

0 H 0 !! Health Centres (1 in 10 chance in any 3

2 given year) !G Garda Stations 1% AEP Flood Extent

0 H

0 ! Hospitals (1 in 100 chance in any 5

9 given year) 2 F 2 ! Fire Stations 0.1% AEP Flood Extent # Civil Defence (1 in 1000 chance in any 0 ! 0 Head Quarters given year) 0 9

2 o Airports 2 ! * Data Source - Service Régional de Traitement d’Image et de Télédétection (SERTIT) (acquired on the 5th of December 2009). 0 0 5 8 2

2 Client 0 0 0

8 Project 2 Shannon CFRAM Study 2 The PFRA Flood Extents shown are indicative. They have been developed using Flood Risk Review Map Title simple and cost-effective methods that are suitable for the PFRA. They should not be Ballinasloe 0 0 Drawing Status 5 used for local decision-making or any other purpose without verification. FINAL 7 Job No. 32102500 2

2 Figure No. Revision CAR 8 Scale 1:30,000 @ A3 Jun 28, 2011 Checked Review Approved Drawn AD/SF JC KK/JM IB/PS Copyright reserved 0 0.5 1 2 Includes Ordnance Survey Ireland data reproduced under OSi Licence number EN0021011. Jacobs UK Ltd Km Unauthorised reproduction infringes Ordnance Survey Ireland and Government of Ireland copyright, © Ordnance Survey Ireland, 2011. 95 Bothwell Street, Glasgow, G2 7HX