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South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL

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South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL South Eastern CFRAM Study HA 15 Hydraulics Report 4.7 Callan IBE0601Rp0015 rpsgroup.com/ireland South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL South Eastern CFRAM Study HA15 Hydraulics Report Callan Model DOCUMENT CONTROL SHEET Client OPW Project Title South Eastern CFRAM Study Document Title IBE0601Rp0015_HA15 Hydraulics Report Model Name Callan Rev. Status Modeller Reviewed by Approved By Office of Issue Date Origin D01 Draft L. Howe I Bentley G. Glasgow Belfast 18/03/2014 /Limerick F01 Draft Final L. Howe K. Smart G. Glasgow Belfast 12/02/2015 F02 Draft Final L. Howe K. Smart G. Glasgow Belfast 13/08/2015 F03 Draft Final L. Howe S. Patterson G. Glasgow Belfast 29/06/2016 IBE0601Rp0015 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL Table of Reference Reports Relevant Report Issue Date Report Reference Section South Eastern CFRAM November IBE0601 Rp0001_Flood Risk Review 3.3.4 Study Flood Risk Review 2011 South Eastern CFRAM Study Inception Report July 2012 IBE0601Rp0008_HA 15 Inception Report 4.3.2 UoM15 South Eastern CFRAM 1.1.1.1, October Study Hydrology Report IBE0601Rp0010_HA15_Hydrology Report 1.1.3.5, 2013 UoM15 1.1.5.4 South Eastern CFRAM January IBE0601Rp0016_South Eastern CFRAMS Study HA11-17 SC4 Survey 1.1 2014 Survey Contract Report Contract Report 4 Hydraulic Model Details ................................................................................................................... 1 4.7 Callan ....................................................................................................................................... 1 4.7.1 General Hydraulic Model Information .............................................................................. 1 4.7.2 Hydraulic Model Schematisation ..................................................................................... 2 4.7.3 Hydraulic Model Construction ........................................................................................ 11 4.7.4 Sensitivity Analysis ........................................................................................................ 21 4.7.5 Hydraulic Model Calibration and Verification ................................................................. 21 4.7.6 Hydraulic Model Assumptions, Limitations and Handover Notes .................................. 30 IBE0601Rp0015 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL 4 HYDRAULIC MODEL DETAILS 4.7 CALLAN 4.7.1 General Hydraulic Model Information (1) Introduction: The South Eastern CFRAM Study Flood Risk Review report (IBE0601Rp0010_Flood Risk Review) highlighted Callan as an AFA for fluvial flooding based on a review of historic flooding and the extents of flood risk determined during the PFRA. The Callan AFA (Model 6) incorporates the Kings River and associated tributaries including the Pawlerth River, Callan Link River and Skeaghacloran River. The Kings River joins the River Nore (Model 7 – Thomastown) from the west approximately 6 km upstream of Thomastown. The total contributing catchment area at the downstream extent of the model is 444 km2, with approximately 45% of this entering the model upstream of the AFA. There are three gauging stations located along the length of the Callan model: • Annamult (15001) – This gauge has an FSU rating of A2; • Callan (15009) – This gauge has an FSU rating of B; • Rathculbin (15023) – This gauge is inactive and has no flow or level data available. Further information on these gauges is provided in Section 4.6.5. A CFRAM rating review was carried out for the Callan gauge (15009) in order to derive new values at the station. See section 4.9.5(b) for full review details. A rainfall run-off model was constructed at the Callan gauge using rainfall radar data supplemented by hourly rainfall data at gauge 3613 in Kilkenny. It was calibrated against observed medium to low flows to increase confidence in the Qmed value and provide a median hydrograph shape. The resulting Qmed value is 40.78 m3/s. The Annamult gauge (15001) was not subject to hydrological modelling given the high degree of confidence in the gauge, including Qmed and hydrograph shape. A number of rivers have been identified as HPWs within the Callan model, including Pawlerth River, Callan Link River, Callan Link B River (adjacent to Callan Link River) and the portion of the Skeaghacloran River and Kings River which pass through the AFA. These reaches have been modelled as 1D-2D using the MIKE suite of software. The remaining section of the Skeaghacloran River and Kings River is modelled as 1D, as it is designated as MPW. On further inspection of survey data and aerial mapping, it was found that the Pawlerth River is blocked off at the downstream end of the watercourse (at the confluence with Kings River). Flow is diverted through IBE0601Rp0015 4.7 - 1 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL the Pawlerth into the Kings River upstream of the N76. Further detail of this is provided in Section 4.7.2(1). (2) Model Reference: HA15_CALL6 (3) AFAs included in the model: CALLAN (4) Primary Watercourses / Water Bodies (including local names): Reach ID Name CALL CALLAN LINK MLKA MULLAUNGLASS LINK A (renamed “Pawlerth Link”) MLKB MULLAUNGLASS LINK B (renamed as the downstream extent of “Pawlerth River”) PAWL PAWLERTH KING CALLAN/KING GS SHEA SKEAGHACLORAN KING KINGS RIVER (5) Software Type (and version): (a) 1D Domain: (b) 2D Domain: (c) Other model elements: MIKE 11 (2011) MIKE 21 – Rectangular Mesh MIKE FLOOD (2011) (2011) 4.7.2 Hydraulic Model Schematisation (1) Map of Model Extents: Figure 4.7.1 and Figure 4.7.2 overleaf illustrate the extent of the modelled catchment, river centreline, HEP locations and AFA extents. The Kings catchment contains three Upstream Limit HEPs, one Downstream Limit HEP, 12 Tributary HEPs and two Gauging Station HEPs. There is no HEP at the location of the Rathculbin Gauging Station (15023) which is inactive and has no flow or water level data. IBE0601Rp0015 4.7 - 2 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL Figure 4.7.1: Model of Map Extent IBE0601Rp0015 4.7 - 3 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL Figure 4.7.2: Map of Model Extents at the AFA Following a review of all survey data, including a culvert survey, it was found that two culverts in the Pawlerth River have been blocked off, namely 15PAWL00052I and 15PAWL00018. It is assumed that 15PAWL00052I (beneath the N76) and 15PAWL00018 (beneath Lower Bridge Street) were disconnected/blocked, and the link channel (Pawlerth Link) was created to divert flow into the Kings River. Surveyors advised that the channel between the two culverts is dry. The model has been developed based on these assumptions; the model extent is shown in Figure 4.7.3. This assumption was later confirmed by the Callan Area Engineer and subsequent survey. IBE0601Rp0015 4.7 - 4 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL Pawlerth Link Pawlerth River 15PAWL00052I (Disconnected) Channel not represented in 1D model 15PAWL00018 (Disconnected) Kings River Figure 4.7.3 Model extent showing the disconnected culverts (2) x-y Coordinates of River (Upstream extent): River Name x y KING CALLAN LINK 242449.63 142886.49 KING CALLAN LINK B 242939.24 142723.59 PAWL PAWLERTH LINK 240951.6 144160.6 PAWL PAWLERTH 240784.81 145125.3 SHEA SKEAGHACLORAN 241661.94 145220.76 KING KINGS RIVER 240687 144114.06 (3) Total Modelled Watercourse Length: 25.0 (km) (4) 1D Domain only Watercourse Length: 15.2 (km) (5) 1D-2D Domain 9.8 (km) Watercourse Length: (6) 2D Domain Mesh Type / Resolution / Area: Rectangular / 5 metres / 10.5 km2 (7) 2D Domain Model Extent: IBE0601Rp0015 4.7 - 5 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL Figure 4.7.4 2D Model Extent Figure 4.7.4 represents the modelled extents and the general topography of the catchment within the 2D model domain. The 2D domain was generated using LiDAR survey data and created as a 5 m grid rectangular mesh. The river centreline is illustrated in black with black areas also representing the blocked cells, e.g. buildings. The area beyond the 2D model domain is illustrated in red. Changes in the vertical scale of this map are outlined by the index; all levels have been set to OD Malin (metres). For details of the approach to modelling buildings in the 2D area, please refer to Section 3.3.2 of this report. Figure 4.7.5 shows the extent of the NDHM data used. The black line depicts the river network and the red boundary represents the LiDAR extent (as shown in Figure 4.7.4). A buffer zone was created between the two datasets which were smoothed together by interpolation. IBE0601Rp0015 4.7 - 6 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL Figure 4.7.5 NDHM Extent IBE0601Rp0015 4.7 - 7 F03 South Eastern CFRAM Study HA15 Hydraulics Report – DRAFT FINAL Figure 4.7.6 shows an overview drawing of the model schematisation. Figure 4.7.8 and Figure 4.7.7: Overview of Model Schematisation provide detailed views. The overview diagram covers the model extents, showing the surveyed cross-section locations, AFA boundary and river centreline. It also shows the area covered by the 2D model domain. The detailed areas are provided where there is the most significant risk of flooding. These diagrams include the surveyed cross-section locations, AFA boundary and river centreline. They also show the location of the critical structures, as discussed in Section 4.7.3(1), along with the location and extent of the links between
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