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Camac Model DOCUMENT CONTROL SHEET Eastern CFRAM Study HA09 Hydraulics Report Camac Model DOCUMENT CONTROL SHEET Client OPW Project Title Eastern CFRAM Study Document Title IBE0600Rp0027_HA09_Hydraulics Report_Camac_F01 Document No. IBE0600Rp0027_ Camac DCS TOC Text List of Tables List of Figures No. of This Document Appendices Comprises 1 1 55 0 0 3 Rev. Status Author(s) Reviewed By Approved By Office of Origin Issue Date D03 Draft A. Sloan A. Jackson G. Glasgow Belfast 21/03/2014 D04 Draft A. Sloan A. Jackson G. Glasgow Belfast 30/09/2014 D05 Draft A. Sloan A. Jackson G. Glasgow Belfast 30/10/2014 D06 Draft A. Sloan A. Jackson G. Glasgow Belfast 29/01/2015 F01 Draft Final A. Sloan A. Jackson G. Glasgow Belfast 16/09/2016 rpsgroup.com/ireland Copyright Copyright - Office of Public Works. All rights reserved. No part of this report may be copied or reproduced by any means without prior written permission from the Office of Public Works. Legal Disclaimer This report is subject to the limitations and warranties contained in the contract between the commissioning party (Office of Public Works) and RPS Group Ireland rpsgroup.com/ireland Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL TABLE OF CONTENTS 4 HYDRAULIC MODEL DETAILS ................................................................................................ 4 4.5 CAMAC MODEL ................................................................................................................ 4 4.5.1 General Hydraulic Model Information ............................................................... 4 4.5.2 Hydraulic Model Schematisation ...................................................................... 6 4.5.3 Hydraulic Model Construction ........................................................................ 13 4.5.4 Hydraulic Model Calibration and Verification ................................................. 23 4.5.5 Sensitivity Analysis ......................................................................................... 34 4.5.6 Hydraulic Model Assumptions, Limitations and Handover Notes .................. 43 IBE0600Rp00027 3 F01 Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL 4 HYDRAULIC MODEL DETAILS 4.5 CAMAC MODEL 4.5.1 General Hydraulic Model Information (1) Introduction The Eastern CFRAM Flood Risk Review (IBE0600Rp0001_Flood Risk Review) highlighted the Camac catchment as an Area for Further Assessment and a High Priority Watercourse based on a review of historic flooding and the extents of flood risk determined during the PFRA. The Camac system is a significant tributary of the River Liffey which emanates in the foothills of the Wicklow Mountains to the south of Dublin City. The catchment area is 58 km2 and is highly urbanised in the lower reaches (50% of the total catchment). The catchment is also characterised by many sub-catchments or branches many of which represent urban drainage networks. There have been two gauging stations located in the catchment within close proximity to one another in the middle reaches of the main river channel. One was located at Clondalkin (09005 - EPA) which was active from 1976 to 1984. The other is located at Killeen Road (09035 - EPA) and has been active since 1996, more detail on the use of these stations and the hydrology derived from them can be found in Section 4.5 of the HA09 Hydrology Report (IBE0600Rp0016_HA09_Hydrology Report). Historically flooding within the Camac catchment originates mainly from fluvial sources in the upstream portion of the catchment, with the Camac River and its tributaries overflowing its banks at a number of locations during recent times. More specific details of historic flooding in the Camac catchment can be found in Section 4.3.2 of the HA09 Inception Report (IBE0600Rp0008_HA09_Inception Report). Some historic flooding in the mid catchment reaches in the vicinity of the M50 crossing and Nangor road has been attributed to bridge and culvert blockages, with businesses constructing localised defences to reduce flood risk to their properties. Residents in the downstream reaches of the catchment have also reported the under capacity of the drainage network as causing flooding during storm events. The model constructed for the Camac catchment is comprised of 1D channel reaches with associated structures, specific topographical channel and structure survey data was captured for the model construction. The Camac floodplain is entirely represented using a Triangular Flexible 2D mesh defined by LiDAR data with building represented using impermeable porous polygons. The 2D mesh is connected to the 1D channel via bank units, once the bank unit levels are exceeded the water then spills to the 2D mesh floodplain. Residents in the downstream reaches of the catchment have also reported the under capacity of the drainage network as causing flooding during storm events however this model does not include drainage infrastructure. As such only fluvial/coastal flooding originating from the main river channel and tributaries has been investigated as per the CFRAM Studies specification. IBE0600Rp00027 4 F01 Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL (2) Model Reference: HA09_CAMM (3) AFAs included in the model: Dublin (4) Primary Watercourses / Water Bodies (including local names): CAMAC RATHCOOLE SAGGART VERSCHOYLES COOLMINE KILNAMANAGH CITYWEST LINK CRUMLIN FITZMAURICE ALVERNA KINGSWOOD WALKINSTOWN CORKAGH CHEEVERSTOWN BROOKVIEW FORTUNESTOWN TALLAGHT (5) Software Type (and version): InfoWorks ICM v5 (a) 1D Domain: Infoworks ICM (b) 2D Domain: Infoworks ICM - (c) Other model elements: Flexible Mesh n/a IBE0600Rp00027 5 F01 Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL 4.5.2 Hydraulic Model Schematisation (1) Map of Model Extents: Map of Model Extents (Upper Catchment) IBE0600Rp00027 6 F01 Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL Map of Model Extents (Middle Catchment) IBE0600Rp00027 7 F01 Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL Map of Model Extents (Lower Catchment) The Maps of Model Extents above illustrate the extent of the modelled catchment, river centre line, HEP locations and AFA extents as applicable. The Camac catchment has been designated as a high priority IBE0600Rp00027 8 F01 Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL watercourse (HPW) in the Dublin AFA and as such does not have a Distinct AFA Extent. The Camac catchment is bounded by the Griffeen, Poddle and Dodder catchments. The computational modelling predicts that some flood flow will spread to the Griffeen catchment during the 0.1% AEP event. Some of the Camac's natural catchment has also been diverted to the Dodder River at Tallaght. Some minor inflow to the Camac River from the Grand Canal occurs at Lansdowne Valley Park via an overflow weir and fountain. A number of types of hydrological estimation points (HEPs) have been employed throughout the Eastern CFRAM Study, these are described in more detail below. HEP at Upstream Limit of Model The upstream extent of each model requires a HEP at which design flows and hydrographs will be derived primarily from a rainfall runoff model; or flow estimation methods as appropriate (for example in small catchments). Upstream model limits will always be at 1km2 contributing catchment areas or more. HEP where tributaries enter modelled channel Moving downstream along the modelled reach, a HEP is located where tributaries with catchment areas greater than 5km2 enter the channel. The Generic CFRAM Study Brief required these HEPs at tributaries where it was considered that more than 10% of the main channel flow was contributed. However, this application led to an abundance of HEPs at tributary confluences in the upper reaches of catchments, and under representation in the lower reaches. This was discussed with the OPW and it was considered that including all tributaries with catchments greater than 5km2 would ensure a more appropriate distribution of HEPs at tributary confluences throughout the catchment. On High Priority Watercourses it will often be appropriate to include flows from catchments which are much smaller than 5km² and where this is the case the inclusion of tributaries will be considered on an individual basis. HEP at gauging stations on modelled channel At gauging stations along the modelled reaches (for which data is available), a HEP is located. These HEPs serve as check points throughout the modelled catchment, so that flow estimates can be calibrated on a catchment basis ensuring appropriate discharges are modelled for each design event. Intermediate/Reporting HEPs Intermediate/Reporting HEPs have both hydraulic input (top-up) and reporting functions as described below: Hydrology estimations at HEPs will be undertaken to ensure that the total contributing catchment at that point in the model can be checked to ensure that the sum of the model inputs are consistent with the total catchment up to that point in the model. The estimated flows at HEPs will also be used to check against modelled flows at the same location. Where necessary the models may need to be ‘topped up’ by increasing the lateral inflows upstream of these HEPs to ensure all of the contributing catchment is considered IBE0600Rp00027 9 F01 Eastern CFRAM Study HA09 Hydraulics Report – DRAFT FINAL HEPs along main channel with maximum distance of 5km – this is a requirement of the Generic CFRAM Study Brief. HEPs will serve as reporting points where calibrated peak flows for each design event at the end of the hydraulic analysis task and will be reported as a
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