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HomeMy WebLinkAbout2560394 - F.I. Received Doc. - Drainage Report 02/07/2026 Page 1 of 25 DRAINAGE REPORT T011H0141-L1-MO-ZZ-XX-RP-IECI-CV-0001 BUS EIREANN MONAGHAN BUS STATION JULY 2026 REVISION C0 Client: Engineer: Bus Eireann Structural & Architectural Design Section Broadstone Network Enhancements Dublin 7 Iarnród Éireann RECEIVED: 29/07/2026 02/07/2026 Page 2 of 25 I. Document Control Sheet Report Title: Drainage Report – Bus Eireann, Monaghan Bus Station Report Ref No.: T011H0141-L1-MO-ZZ-XX-RP-IECI-CV-0001-D1 Date of First Issue: April 2026 Report Origin: Structural & Architectural Design Section, Engineering & New Works Building, Inchicore, Dublin 8. Client: Bus Eireann REVISION DETAIL PREPARED BY & DATE CHECKED BY & DATE AUTHORISED BY & DATE D0 Draft Conor Gorman April 2026 Ray Robinson April 2026 D1 Draft Conor Gorman BEng, CEng, MIEI July 2026 Anthony Browne Architect BA(Hons) Dip Arch, MRIAI July 2026 Ray Robinson BEng, MIEI July 2026 C0 For Planning Conor Gorman July 2026 Anthony Browne Architect BA(Hons) Dip Arch, MRIAI July 2026 Ray Robinson BEng, MIEI July 2026 RECEIVED: 29/07/2026 02/07/2026 Page 3 of 25 Contents I. Document Control Sheet ................................................................................................................. 2 1. Introduction ...................................................................................................................................... 4 1.1. Purpose ....................................................................................................................................... 4 1.2. Existing Site................................................................................................................................. 4 1.3. Proposed Development ............................................................................................................... 5 2. Surface Water Drainage .................................................................................................................. 6 2.1. Existing Surface Water Network ................................................................................................. 6 2.2. Proposed Surface Water Network............................................................................................... 8 2.3. Interceptors ................................................................................................................................. 8 2.4. Sustainable Urban Drainage Systems (SUDS) ........................................................................... 9 3. Foul Water Drainage ..................................................................................................................... 14 3.1. Existing Foul Water Drainage ................................................................................................... 14 3.2. Proposed Foul Water Drainage................................................................................................. 14 4. Water Supply ................................................................................................................................. 15 4.1. Existing Water Supply ............................................................................................................... 15 4.2. Fire Hydrants ............................................................................................................................. 15 5. Drawings ....................................................................................................................................... 15 6. Ground Water ................................................................................................................................ 15 7. Flood Risk Assessment ................................................................................................................. 17 Appendix A Photographic Record Appendix B CFRAM Maps Appendix C Flood Risk Maps RECEIVED: 29/07/2026 02/07/2026 Page 4 of 25 1. Introduction 1.1. Purpose This report is submitted as Further Information to the planning application (reference: 25/60394) for proposed extension and alterations to Monaghan Bus Station. The report includes a flood risk assessment, and outlines the existing and proposed foul water, surface water and watermain arrangements. Figure 1. Site Location 1.2. Existing Site The existing Monaghan Bus Station is a small, surface-level regional bus facility located on North Road, Monaghan (H18 PN25), immediately north of the town centre and within walking distance of key civic and commercial destinations. The facility functions primarily as a bus stop / small terminal, rather than a large, enclosed station building. It comprises a compact hardstanding area with a limited number of bus stands (typically 1 –2 operational berths), set out to accommodate standard 12 m single-deck regional buses used by Bus Éireann and TFI Local Link services. There is no large internal concourse; passenger waiting is accommodated via sheltered external waiting facilities and seating, consistent with smaller bus stations. The station serves as the principal bus interchange for Monaghan Town, supporting both: • Inter-urban Bus Éireann routes (e.g. Dublin–Letterkenny, Galway–Monaghan, Drogheda– Monaghan), and • Local and rural services operated under the TFI Local Link Cavan–Monaghan network. Site Location RECEIVED: 29/07/2026 02/07/2026 Page 5 of 25 Figure 2. Existing Site Plan 1.3. Proposed Development The proposed development seeks permission for the construction of a single -storey extension to the existing bus station by enclosing the existing internal courtyard area, the reconfiguration of the entire internal layout of the building to improve accessibility and functionality, the replacement of the existing roof finish, the reconfiguration of external fenestration and recladding of the existing building using fibre cement façade materials, the reconfiguration of existing bus circulation to provide 4 no. new bus bays, the installation of a new canopy to the rear of the building to provide additional covered waiting areas for customers, new boundary treatments around the site, the provision of a dedicated guide dog relief area with associated landscaping works, the reconfiguration of the car parking layout, including the creation of designated pedestrian walkways and a new drop-off area, the construction of new pedestrian crossings at each vehicle entrance, and all associated site works. Figure 3. Proposed Site Layout RECEIVED: 29/07/2026 02/07/2026 Page 6 of 25 2. Surface Water Drainage 2.1. Existing Surface Water Network Surface water from the bus yard around the station building is captured in road gullies and directed to an interceptor before exiting the site. Rainfall which lands on the roof of the station is discharged into the drains on site or directly discharged to the public storm sewer along the North Road. There is no direct capture of runoff from the bus parking area to the east of the station. Runoff departs the site down the vehicle entrance ramp or flows into a grassy adjacent to the ramp. Surface water which lands in the car parking area to the west of the site flows into a channel with road gullies. There are no surface water manholes in this location, so the direction of flow could not be established. Due to site topography, it is believed that there is a direct connection into the public storm sewer on the North Road. Figure 4. Existing Site Drainage Layout RECEIVED: 29/07/2026 02/07/2026 Page 7 of 25 Figure 5. Monaghan County Council Archive Records Figure 6. Recent Upgrade of Storm sewer into Patena Lake RECEIVED: 29/07/2026 02/07/2026 Page 8 of 25 2.2. Proposed Surface Water Network The surface water drains for the station building and new bays will be upgraded from a 150mm to a 225mm pipe, to accommodate increased peak flows for 1:30 year storm events (plus 20% climate change factor). The drains will be extended to capture runoff from the bus parking areas to the east. A surface channel will be constructed along the top of the entrance ramp to prevent spillage onto the North Road. The staff and customer car parking areas will be reoriented, and the parking bays will be constructed with a porous asphalt surface and infiltration sub-base. Any overflow from the sub-base will be directed into the adjacent planting areas which will be created around the parking bays. This will mitigate the effect of the increase hardstand at the bus parking area. Figure 7. Proposed Site Drainage Layout 2.3. Interceptors The existing interceptor is serviced and maintained by ENVA Environmental. Disposal records indicate that approximately 4.3 tonnes of waste liquid were removed during the most recent service in April 2026, with no defects reported at the time. Construction records for the existing interceptor are not available. However, the volume of waste removed is comparable with a full retention separator having a storage capacity in the range of 4,000 to 5,000 litres. Manufacturer guidance (Kingspan / Klargester) indicates that interceptors of this size typically serve drained areas of 16,670 - 22,222m2. The impermeable surface area of the yard is approximately 3,100m2. Given the sensitive location of the site where the surface water feeds into Patena’s Lake, Bus Eireann commits to confirming the type and capacity of the existing interceptor (bypass or full retention). Should the interceptor be found not to meet current requirements, it will be upgraded or replaced accordingly. RECEIVED: 29/07/2026 02/07/2026 Page 9 of 25 Figure 8. Typical Full Retention Separator Sizing Chart 2.4. Sustainable Urban Drainage Systems (SUDS) Monaghan County Council will require that all developments incorporate ‘Sustainable Drainage Systems’ (SuDS) as part of the development proposals. SuDS offers a total solution to rainwater management and is applicable in both urban and rural situations. SuDS are effective technologies which aim to reduce flood risk, improve water quality and enhance biodiversity and amenity. By using SuDS techniques, water is either infiltrated or conveyed more slowly to the drainage system and ultimately to water courses via permeable paving, swales, green roofs, filter drains, rainwater harvesting, detention basins, ponds, and wetlands. Ponds, artificial wetlands, and water features can make a positive contribution to the provision of Sustainable Drainage Systems (SuDS) an d to the amenity of an area. The systems should aim to mimic the natural drainage of a site to minimise the effect of a development on flooding and pollution of existing waterways. Properly designed and located SuDS features can be incorporated within and can complement the amenity and aesthetic value of open spaces. RECEIVED: 29/07/2026 02/07/2026 Page 10 of 25 Figure 9. SuDS Design The site currently has three green spaces around the perimeter with uneven terrain with long grass. There is a small, planted area at the front of the station facing onto the North Road. The current arrangement is not especially developed to improve water quality, reduce water quantity, improve public amenity or enhance biodiversity. Figure 10. Grass area at rear of site with bus overhang The proposed layout will introduce a new public space with seating; secure bicycle stands and planting. The surface water runoff will be directed into tree pits beneath the paving. This will reduce the quantity of water being discharged into the public system and improve the public amenity. RECEIVED: 29/07/2026 02/07/2026 Page 11 of 25 Figure 11. Public Space with Seating, Planting and Bicycle Stands Figure 12. Tree Pit Typical Detail The parking bays will be constructed with a porous asphalt surface and infiltration sub -base. Any overflow from the sub-base will be directed into the adjacent planting areas which will be created around the parking bays. The planted areas will include medium sized trees and shrubs. This will reduce water quantity discharge and enhance biodiversity. RECEIVED: 29/07/2026 02/07/2026 Page 12 of 25 Figure 13. New Parking Arrangements The uneven grassy area adjacent to the vehicle entrance will be planted with medium sized trees and shrubs. The grass area along the rear boundary of the site will be planted with a native hedge to run along the fence line. These actions will enhance the site biodiversity. Figure 14. Vehicle Entrance RECEIVED: 29/07/2026 02/07/2026 Page 13 of 25 Figure 15. Permeable Paving / Porous Asphalt Bus Eireann’s Sustainability Strategy 2024 – 2030 reaffirms their commitment to integration of habitat creation measures into capital investment building and land development projects. Figure 16. Bus Eireann Sustainability Strategy 2024 -2030 RECEIVED: 29/07/2026 02/07/2026 Page 14 of 25 3. Foul Water Drainage 3.1. Existing Foul Water Drainage The foul drains flow from the building towards an old culvert at the western side of the bus yard. The culvert transitions into a 150mm drain and flows down the embankment in the direction of manhole SH67342202. Dye testing was undertaken in June 2026 to verify the route of the foul drains exiting the site. The testing confirmed that foul from the site enters the public sewer at manhole SH67342202. Figure 17. Uisce Eireann Foul Network Map 3.2. Proposed Foul Water Drainage There are no proposed changes to the external foul drainage system on site. Sanitary fittings are being altered / added within the building footprint. RECEIVED: 29/07/2026 02/07/2026 Page 15 of 25 4. Water Supply 4.1. Existing Water Supply The size and type of watermain connection from the public supply is not known. This is to be determined by the mechanical & electrical consultant during detailed design. Uisce Eireann network maps show a 225mm PE main along the North Road. Figure 18. Uisce Eireann Network Map 4.2. Fire Hydrants There is a single fire hydrant in the public footpath at the pedestrian entrance. 5. Drawings The following drawings are provided in support of the planning application • T011H0141-L1-MO-ZZ-XX-DR-IECI-CV-0300 EXISTING DRAINAGE LAYOUT • T011H0141-L1-MO-ZZ-XX-DR-IECI-CV-0301 PROPOSED DRAINAGE LAYOUT 6. Ground Water The site is underlain by a regionally important aquifer, as classified by the Geological Survey Ireland, indicating that the bedrock has the capacity to yield significant quantities of groundwater suitable for public water supply. This classification highlights the importance of protecting groundwater quality at the site. The groundwater vulnerability is classified as moderate, indicating that while there is some natural protection from overlying soils, contaminants may still reach the aquifer if not approp riately managed. Accordingly, the proposed drainage design incorporates suitable pollution control measures, including the use of hydrocarbon interceptors, permeable paving systems, and vegetated SuDS features, to ensure that runoff is treated prior to inf iltration or discharge. RECEIVED: 29/07/2026 02/07/2026 Page 16 of 25 Figure 19. Ground Water Vulnerability Map Figure 20. Ground Water Resources / Aquifers Map RECEIVED: 29/07/2026 02/07/2026 Page 17 of 25 7. Flood Risk Assessment Flood Risk Assessments (FRAs) are a key requirement of the Irish planning system and are carried out in accordance with The Planning System and Flood Risk Management – Guidelines for Planning Authorities (2009), issued under Section 28 of the Planning and Development Act 2000. These Guidelines require planning authorities and An Bord Pleanála to incorporate flood risk identification, assessment and management into all stages of the planning process. A site-specific FRA is required where a proposed development may be subject to flood risk or where a planning authority determines that such risk may exist. The primary purpose of an FRA is to identify, quantify and assess the potential risk of flooding from all sources, including fluvial, pluvial, coastal and groundwater flooding. Flood risk is defined as a combination of the probability of flooding and the potential consequences for people, property, infrastructure and the environment. Figure 21. OPW – The Planning System and Flood Risk Management In 2011 the Office of Public Works (OPW) carried out a national screening exercise in order to assess and measure flood risk nationally. This study identified areas exposed to significant flood risk. These areas and associated sources of flood risk were id entified through the Preliminary Flood Risk Assessment (PFRA). The final report of the PFRA was published in March 2012 along with the designation of Areas for Further Assessment (AFA). The OPW designated 300 AFAs at potentially significant risk from flooding, which include in the order of 80% of properties at risk in Ireland from rivers and seas, the primary source of flooding in Ireland. AFAs were considered at greater detail as part of the National Catchment-based Flood Risk Assessment and Management (CFRAM) Programme. RECEIVED: 29/07/2026 02/07/2026 Page 18 of 25 The CFRAM Programme, Ireland’s largest study of flood risk, undertaken by the OPW in consultation with the Local Authorities and supported by external engineering consultants was completed in 2018. This studied the flood risk for two-thirds of the population against risk of flooding from rivers and the sea. County Monaghan is covered by the Neagh Bann CFRAM and the Northern and Western CFRAM. Four AFAs were identified in County Monaghan: • Monaghan • Carrickmacross • Ballybay • Inniskeen Figure 22. OPW Past Flood Event Local Summary Having regard to the nature and scale of the proposed development, the historical flood record, and publicly available flood mapping; the proposed works will not increase flood risk on-site or elsewhere, nor will they impede the operation of existing flood protection measures. RECEIVED: 29/07/2026 02/07/2026 Page 19 of 25 Appendix A Photographic Record RECEIVED: 29/07/2026 02/07/2026 Page 20 of 25 RECEIVED: 29/07/2026 02/07/2026 Page 21 of 25 RECEIVED: 29/07/2026 02/07/2026 Page 22 of 25 RECEIVED: 29/07/2026 02/07/2026 Page 23 of 25 RECEIVED: 29/07/2026 02/07/2026 Page 24 of 25 Appendix B CFRAM Maps RECEIVED: 29/07/2026 !( !( !( !( !( !( !( !( !( !( !( !( 06MULL001 0642M00009 0640M00062 0639M00184 0639M00223 0639M00285 0639M00319 0640M00000J 0639M00232J 0639M00270I 064 1M000 46eI 064 1M000 46bI 26 620 0 26 620 0 266 400 266 400 26 660 0 26 660 0 266 800 266 800 26 700 0 26 700 0 267200 267200 267400 267400 267600 267600 267800 267800333000 333000333200333200333400333400333600333600333800333800334000334000[0 100 200 300 400 50050Metres © Ordnance S urvey Irela nd. All rig hts r eser ved. Licence number E N 002 1016/Officeo fP ublicWorks. F.M.C. E.H. 15 July 2016 15 July 2016 15 July 2016S.P. EXTENT FLU VIAL HPW CURRENT Monaghan Fluvial Flood Extents N06MGN_EXFCD_F0_12Drawing N o. : Map: Map Type: Source: Map A rea: Scenario: Date :Drawn By : Map Series : Drawing Scale : Checked By :Date : Date :Approved B y : The Office of Public WorksJonathan Swift StreetTrimCo Meath Elmwood House 74 Boucher RoadBelfastBT12 6RZ T +44(0) 28 90 667914F +44(0) 28 90 668286W www.rpsgroup.comE ireland@rpsgroup.com NOTE:REV:DATE : F I N A L 1:5,000 Page 12 of 17 Monaghan Node ID Legend 10% Fluvial AEP Even t 1% Fluvial AEP Event 0.1% Fluvial AEP Eve nt Modelle d Rive r Cent reline AFA Ex tents Node Label !(Node Point @A 3 IMPORTANT USER NOTE: THE VIEWER OF THIS MAP SHO ULD REFERTO THE DISCL AIMER, GUIDANCE NOTES AND CONDITIONS O F USE THAT ACCOMPANY THIS MAP. Node LabelNode Label Water L evel (OD) 10% AEP Flow (m³/s) 10% AEP Water Level (OD) 1% AEP Flow (m³/s) 1% AEP Water L evel (OD) 0.1 % AEP Flow (m³/s) 0.1% AEP 0639M003 19 56.24 0.53 56.38 0.91 56.53 1.41 0639M002 85 54.57 2.27 54.87 3.70 55.23 5.07 0639M002 70I 54.56 2.09 54.86 3.01 55.22 4.67 0639M002 32J 52.96 1.90 53.43 3.07 54.68 9.52 0639M002 23 52.84 2.00 53.35 2.81 54.67 5.06 0639M001 84 52.58 N/A 53.18 N/A 54.14 N/A 0640M000 62 56.01 0.36 56.19 0.63 57.03 1.01 0640M000 00J 52.84 0.67 53.45 1.02 54.67 1.09 0642M000 09 55.76 2.36 55.84 2.99 56.01 4.47 06MULL 001 59.31 0.01 59.50 0.02 59.88 0.03 0641M000 46bI 58.16 N/A 58.34 N/A 59.32 N/A 0641M000 46eI 56.53 0.32 56.90 0.69 57.72 0.83RECEIVED: 29/07/2026 !( !( !( !( !( !( !( !( 06MULL001 0644M00078 0640M00062 0639M00008 0639M00082 0635M01577 0635M01588 0635M016070635M01611 0635M01659 0635M01709 0635M017590635M01789 0639M00031I 26 660 0 26 660 0 266 800 266 800 26 700 0 26 700 0 267 200 267 200 26 7400 26 7400 267600 267600 267800 267800 268000 268000334200 334200334400334400334600334600334800334800335000335000335200335200335400335400[0 100 200 300 400 50050Metres © Ordnance S urvey Irela nd. All rig hts r eser ved. Licence number E N 002 1016/Officeo fP ublicWorks. F.M.C. E.H. 15 July 2016 15 July 2016 15 July 2016S.P. EXTENT FLU VIAL HPW CURRENT Monaghan Fluvial Flood Extents N06MGN_EXFCD_F0_03Drawing N o. : Map: Map Type: Source: Map A rea: Scenario: Date :Drawn By : Map Series : Drawing Scale : Checked By :Date : Date :Approved B y : The Office of Public WorksJonathan Swift StreetTrimCo Meath Elmwood House 74 Boucher RoadBelfastBT12 6RZ T +44(0) 28 90 667914F +44(0) 28 90 668286W www.rpsgroup.comE ireland@rpsgroup.com NOTE:REV:DATE : F I N A L 1:5,000 Page 3 of 17 Monaghan Node ID Legend 10% Fluvial AEP Even t 1% Fluvial AEP Event 0.1% Fluvial AEP Eve nt Modelle d Rive r Cent reline AFA Ex tents Node Label !(Node Point @A 3 IMPORTANT USER NOTE: THE VIEWER OF THIS MAP SHO ULD REFERTO THE DISCL AIMER, GUIDANCE NOTES AND CONDITIONS O F USE THAT ACCOMPANY THIS MAP. Node L abelNode L abel Water Level (OD ) 10% AEP Flow (m³/s) 10% AEP Water Level (OD ) 1% AEP Flow (m³/s) 1% AEP Water Level (OD ) 0.1% AEP Flow (m³/s) 0.1% AEP 0635M01759 53.34 N/A 54.04 N/A 54.80 N/A 0635M01709 53.19 N/A 53.94 N/A 54.73 N/A 0635M01659 52.91 N/A 53.71 N/A 54.51 N/A 0635M01588 52.36 48.57 53.02 73.67 53.67 107.50 0635M01577 52.25 50.96 52.90 79.20 53.52 117.44 0639M00082 52.38 N/A 53.05 N/A 53.85 N/A 0639M00031I 52.31 2.60 52.98 4.00 53.69 8.27 0639M00008 52.29 2.63 52.96 4.08 53.63 8.30 RECEIVED: 29/07/2026 02/07/2026 Page 25 of 25 Appendix C OPW Flood Map – Local Area Report RECEIVED: 29/07/2026 Past Flood Event Local Area Summary Report Report Produced: 22/4/2026 14:48 This Past Flood Event Summary Report summarises all past flood events within 2.5 kilometres of the map centre. This report has been downloaded from www.floodinfo.ie (the "Website"). The users should take account of the restrictions and limitations relating to the content and use of the Website that are explained in the Terms and Conditions. It is a condition of use of the Website that you agree to be bound by the disclaimer and other terms and conditions set out on the Website and to the privacy policy on the Website. Map Legend * Important: These maps do not indicate flood hazard or flood extent. Their purpose and scope is explained on Floodinfo.ie 12 Results Name (Flood_ID)Start Date Event Location 1.Monaghan C115 Ballyalbony 20th Nov 2009 (ID-10730)19/11/2009 Approximate Point Additional Information:Reports (1)Press Archive (0) 2.Monaghan C115 Coolshannagh 20th Nov 2009 (ID-10733)19/11/2009 Approximate Point Additional Information:Reports (1)Press Archive (0) 3.Flooding at Ballyalbany on 05/12/2015 (ID-13357)05/12/2015 Approximate Point Additional Information:Reports (0)Press Archive (0) 4.Flooding at Coolshannagh on 05/12/2015 (ID-13369)05/12/2015 Approximate Point Additional Information:Reports (0)Press Archive (0) 5.Flooding at Monaghan on 05/12/2015 (ID-13380)05/12/2015 Approximate Point Additional Information:Reports (0)Press Archive (0) 6.Monaghan Recurring (ID-3207)n/a Approximate Point Additional Information:Reports (1)Press Archive (2) 2 km Single Flood Event Recurring Flood Event Past Flood Event Extents Drainage Districts Benefited Lands* Land Commission Benefited Lands* Arterial Drainage Schemes Benefited Lands*RECEIVED: 29/07/2026 Name (Flood_ID)Start Date Event Location 7.Shambles Monaghan Town 20th Nov 2009 (ID-10731)19/11/2009 Approximate Point Additional Information:Reports (1)Press Archive (0) 8.Monaghan Crover 20th Nov 2009 (ID-10732)19/11/2009 Approximate Point Additional Information:Reports (1)Press Archive (0) 9.Flooding at Monaghan on 28/12/2015 (ID-13464)28/12/2015 Approximate Point Additional Information:Reports (0)Press Archive (0) 10.Monaghan C115 Creamery 20th Nov 2009 (ID-10729)19/11/2009 Approximate Point Additional Information:Reports (1)Press Archive (0) 11.Monaghan Blackwater Monaghan Town Creamery 24th October 2011 (ID-11691)23/10/2011 Approximate Point Additional Information:Reports (1)Press Archive (0) 12.Shambles River Monaghan Town 24th October 2011 (ID-11694)23/10/2011 Approximate Point Additional Information:Reports (1)Press Archive (0)RECEIVED: 29/07/2026