Strategic Flood Risk Assessment of the Kildare County Development Plan 2017-2023

Strategic Flood Risk Assessment of the Kildare County Development Plan 2017-2023 MDW0710Rp0004 September 2016 rpsgroup.com/ireland Strategic Flood Risk Assessment of the Kildare County Development Plan 2017‐2023 Document Control Sheet Client: Kildare County Council Project Title: Strategic Flood Risk Assessment of the Kildare County Development Plan 2017‐2023 Document Title: Strategic Flood Risk Assessment Document No: MDW0710Rp0004 Text Pages: 85 Appendices: 3 Rev. Status Date Author(s) Reviewed By Approved By 19th September F01 Final BT JFH JFH 2016 Copyright RPS Group Limited. All rights reserved. The report has been prepared for the exclusive use of our client and unless otherwise agreed in writing by RPS Group Limited no other party may use, make use of or rely on the contents of this report. The report has been compiled using the resources agreed with the client and in accordance with the scope of work agreed with the client. No liability is accepted by RPS Group Limited for any use of this report, other than the purpose for which it was prepared. RPS Group Limited accepts no responsibility for any documents or information supplied to RPS Group Limited by others and no legal liability arising from the use by others of opinions or data contained in this report. It is expressly stated that no independent verification of any documents or information supplied by others has been made. RPS Group Limited has used reasonable skill, care and diligence in compiling this report and no warranty is provided as to the report’s accuracy. No part of this report may be copied or reproduced, by any means, without the written permission of RPS Group Limited rpsgroup.com/ireland SFRA of the Kildare County Development Plan 2017‐2023 TABLE OF CONTENTS 1 INTRODUCTION ................................................................................................................. 1 1.1 BACKGROUND ................................................................................................................................ 1 1.2 REPORT OBJECTIVES ......................................................................................................................... 1 1.3 DISCLAIMER ................................................................................................................................... 2 1.4 REPORT STRUCTURE ......................................................................................................................... 3 2 STUDY AREA ...................................................................................................................... 4 2.1 INTRODUCTION ............................................................................................................................... 4 2.2 WATERCOURSES ............................................................................................................................. 5 2.3 NON COUNTY DEVELOPMENT PLAN AREAS .......................................................................................... 5 3 THE PLANNING SYSTEM AND FLOOD RISK MANAGEMENT GUIDELINES FOR PLANNING AUTHORITIES ..................................................................................................................... 6 3.1 INTRODUCTION ............................................................................................................................... 6 3.2 FLOOD RISK ASSESSMENT .................................................................................................................. 7 3.2.1 Flood Risk Assessment Approach ...................................................................................... 7 3.2.2 Types of Flooding .............................................................................................................. 7 3.2.3 Flood Risk .......................................................................................................................... 8 3.3 FLOOD ZONES ................................................................................................................................. 8 3.4 CLIMATE CHANGE ............................................................................................................................ 9 3.5 STRATEGIC FLOOD RISK ASSESSMENT ................................................................................................ 10 3.6 SEQUENTIAL APPROACH AND JUSTIFICATION TEST ............................................................................... 10 3.7 DEVELOPMENT PLAN JUSTIFICATION TEST ................................................................................... 12 4 DEVELOPMENT MANAGEMENT AND FLOOD RISK ............................................................. 14 4.1 OVERVIEW ................................................................................................................................... 14 4.2 SURFACE WATER AND DRAINAGE .................................................................................................... 14 4.2.1 Drainage .......................................................................................................................... 15 4.2.2 Storm Water Management ............................................................................................. 15 4.3 RESIDUAL RISK .............................................................................................................................. 16 4.4 DEVELOPMENT PROPOSALS IN FLOOD ZONES .................................................................................... 16 4.4.1 Overview ......................................................................................................................... 16 4.4.2 Assessment of Proposals for Minor Development .......................................................... 17 4.4.3 Assessment of Proposals for Highly Vulnerable Development ....................................... 17 4.4.4 Assessment of Proposals for Less Vulnerable Development .......................................... 17 MDW0710Rp0004F01 i SFRA of the Kildare County Development Plan 2017‐2023 4.4.5 Extension of Duration in Flood Risk Areas ...................................................................... 18 5 FLOOD RISK ...................................................................................................................... 19 5.1 INTRODUCTION ............................................................................................................................. 19 5.2 HISTORICAL FLOODING ................................................................................................................... 19 5.3 CFRAM STUDIES ............................................................................................................................ 20 5.3.1 Background ...................................................................................................................... 20 5.3.2 Flood Risk Management Plans ........................................................................................ 21 5.3.3 CFRAM Fluvial Flood Zone Mapping ................................................................................ 22 5.4 FLOOD DEFENCE WORKS ................................................................................................................. 22 5.4.1 Flood Defence Schemes .................................................................................................. 22 5.4.2 Flood Zone Mapping for Flood Defence Schemes........................................................... 23 5.5 LIFFEY FLOOD CONTROLS ................................................................................................................ 24 5.6 OPW PRELIMINARY FLOOD RISK ASSESSMENT INDICATIVE FLUVIAL FLOOD MAPS ....................................... 24 5.7 INDICATIVE SFRA FLOOD MAPPING .................................................................................................. 25 5.8 FLUVIAL FLOOD ZONE MAPPING REVIEW ......................................................................................... 25 5.9 OTHER SOURCES OF FLOODING ........................................................................................................ 27 5.9.1 Overview ......................................................................................................................... 27 5.9.2 Coastal Flooding .............................................................................................................. 27 5.9.3 Groundwater Flooding .................................................................................................... 27 5.9.4 Pluvial Flooding ............................................................................................................... 27 5.10 CLIMATE CHANGE SENSITIVE AREAS .................................................................................................. 28 5.10.1 Overview ................................................................................................................... 28 5.10.2 Draft CFRAM Flood Extents ....................................................................................... 28 5.10.3 SFRA Indicative Flood Zone Maps ............................................................................. 29 5.10.4 PFRA Indicative Flood Extents ................................................................................... 30 6 DEVELOPMENT PLAN ZONING ........................................................................................... 31 6.1 INTRODUCTION ............................................................................................................................

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