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Askeaton, Co. Limerick Unique ID: 240365 Stage 1: Desktop Review

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Askeaton, Co. Limerick Unique ID: 240365 Stage 1: Desktop Review Location: Askeaton, Co. Limerick Unique ID: 240365 (from PFRA database) Initial OPW Designation APSR AFRR IRR Co-ordinates Easting: 134000 Northing: 150000 River / Catchment / Sub-catchment River Deel / Shannon Estuary Type of Flooding / Flood Risk Fluvial non-tidal Fluvial tidal Coastal (identify all that apply) Stage 1: Desktop Review 1.1 Flood History River Flow Path (include review of River Deel flows through the centre of the town from south (Rathkeale) to Floodmaps.ie) north (Shannon River/Estuary). Flood event records One flood record (recurring). Flooding across the L1236 and Southern Chemicals (Aeroboard) Factory. The Deel overflows on left bank upstream of Askeaton, and feeds into a stream to the west of the L1236. This overflows affecting the factory car park before re-entering the Deel. No premises flooded. Frequency one or two times per annum. 1.2 Relevant PFRA database comments (in italics): information on flooding issues from OPW comments OPW and LA staff Factory flooding LA comments (am) OPW Constructed an embankment. Flooding occurred in 2008(pm) All agree it is an APSR Meeting / discussion summary comments: OPW comments • OPW has an embankment approximately 200 m long. This is upstream of the town to prevent flows coming out of the Deel and then flooding the town (at the Aerobord factory) via a small tributary flowing into the Deel from the west. LA comments • The outdoor swimming pool d/s of the Main St bridge on the left bank regularly floods. • The right bank immediately u/s and d/s of this bridge is known to flood every 1-3 years. • Properties west of Aerobord’s water channel u/s of the bridge used to have flooding issues, but not in recent years. • Main influence at this site is tidal. Flood Risk Review Report – UoM 24 Askeaton V0_A 1 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 50 Monuments 38.1 (LV) Total: 1101.46 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 2 Flood Risk Review Report – UoM 24 Askeaton V0_A Stage 2: Site Inspection Level B Assessment Date and Time of Inspection Date: 13/04/11 Time: 14:40 Names of inspection team Iain Blackwell (including OPW/LA staff if present) Kelly Kasperczyk 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 Six-arch bridge in town centre with large piers / supports. Head loss across hydraulic the bridge in high flows is significant. constrictions The castle island and tail race force most of the flow on the Deel to the right of (bridges, etc.) and the island. conveyance routes 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 Other Pumping Station Erosion Protection Sand Dunes Flood Risk Review Report – UoM 24 Askeaton V0_A 3 Additional notes (if required): There is a significant natural drop in the river bed adjacent to the Aeroboard factory which is the site of a weir for the offtake to a mill head race. The flow along this head race is controlled by large vertical lift sluice gates. The main walls that may provide some defence are on the left bank of the mill tail race adjacent to the Aerobord factory. There is a quarry adjacent to the Aerobord factory which may be possible to use for flood storage. OPW has recently constructed an embankment at Foley’s Farm, approximately 2- 3km u/s of the Aerobord factory to prevent flows coming out of the Deel and feeding the stream that has historically led to flooding at the Aerobord factory. 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): The use of the mill race, with sluices open, may provide the basis for use as a flood relief channel. Note that while the main bridge presents a significant hydraulic restriction, any works to the bridge would need to be considered in relation to its cultural heritage value. Outcomes Recommended APSR not an APSR IRR Designation Summary Comments (if Recent works on the Deel appear to have reduced the flood risk to required) Askeaton (embankment works by OPW upstream of the town). However, there is a residual flood risk in the town from the River Deel. Flood Risk Review Report – UoM 24 Askeaton V0_A 4 Photo 2: Mill head race u/s at the Photo 1: The River Deel d/s south of Askeaton Aeroboard factory Photo 4: The River Deel d/s looking north Photo 3: The Six-arch bridge in town centre u/s looking south 5 Flood Risk Review Report – UoM 24 Askeaton V0_A 0 132000 132500 133000 133500 134000 134500 135000 135500 136000 0 Askeaton 0 2 5 1 0 0 5 1 5 1 0 0 0 1 5 1 Legend APSR Boundary Rail Network for CARs only Roads Historic Flooding (National Roads Authority) 0 0 5 Incidents 0 Airport Land 5 1 Water bodies mapped OPW Embankments from RADARSAT-2 * Historic Flood Data Hydrometric Gauging Stations Architectural Heritage EPA River Network UNESCO Sites Special Protection Area 0 Rail Stations 0 0 Special Area for 0 5 Nursing Homes 1 Conservation Residential Care Proposed National for the Elderly Heritage Area Schools National Heritage Area Ports and Harbours Benefiting Lands 0 Flood Extents (PFRA, 2010) 0 5 OPW Buildings 9 10% AEP Flood Extent 4 1 Health Centres (1 in 10 chance in any given year) Garda Stations 1% AEP Flood Extent Hospitals (1 in 100 chance in any given year) Fire Stations 0.1% AEP Flood Extent 0 0 Civil Defence 0 (1 in 1000 chance in any 9 4 Head Quarters given year) 1 Airports * Data Source - Service Régional de Traitement d’Image et de Télédétection (SERTIT) (acquired on the 5th of December 2009). Client 0 0 5 8 4 1 Project Shannon CFRAM Study 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 Askeaton used for local decision-making or any other purpose without verification. Drawing Status FINAL Job No. 32102500 Figure No. Revision CAR 4 0 Scale 1:15,000 @ A3 Jun 28, 2011 0 Checked Review Approved Drawn 0 8 AD/SF JC KK/JM IB/PS 4 Copyright reserved 1 0 0.3 0.6 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.
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