Greater Dublin Strategic Drainage Study Final Strategy Report ______
Total Page:16
File Type:pdf, Size:1020Kb
Greater Dublin Strategic Drainage Study Final Strategy Report __________________________________________________________________________________________ Greater Dublin Strategic Drainage Study Final Strategy Report Document Title Final Strategy Report Volume 1 – Main Report Volume 2 – Appendices Document Ref (s): GDSDS/NE02057/035C Date Edition/Rev Status Originator Checked Approved 28/05/04 A Draft N Fleming J Grant M Hand M Edger C O’Keeffe 06/08/2004 B Draft N Fleming J Grant M Hand M Edger C O’Keeffe 27/04/2005 C Final N Fleming J Grant M Hand M Edger C O’Keeffe Contracting Authority (CA) Personnel Council Area Council Name Operations Manager Office Location Project Engineer Name Telephone No. Operations Manager Name Telephone No. This report has been prepared for the Contracting Authority in accordance with the terms and conditions of appointment for the Greater Dublin Strategic Drainage Study dated 23rd May 2001. The McCarthy Hyder MCOS Joint Venture cannot accept any responsibility for any use of or reliance on the contents of this report by any third party. _________________________________________________________________________________________________________________ GDSDS/NEO2057/035C April 2005 Greater Dublin Strategic Drainage Study Final Strategy Report __________________________________________________________________________________________ TABLE OF CONTENTS VOLUME 1 1. EXECUTIVE SUMMARY.................................................................................................................6 1.1 INTRODUCTION ............................................................................................................................................6 1.2 STUDY OBJECTIVES .....................................................................................................................................6 1.3 REGIONAL DRAINAGE POLICIES ....................................................................................................................7 1.4 POPULATION AND LAND USE.........................................................................................................................7 1.5 DATA COLLECTION, PROCESSING AND HYDRAULIC MODELLING.......................................................................8 1.6 SEWERAGE SYSTEMS ..................................................................................................................................8 1.7 WASTEWATER TREATMENT WORKS ..............................................................................................................9 1.8 RIVER AND STORMWATER SYSTEMS .............................................................................................................9 1.9 CRITERIA, STANDARDS AND INFLUENCES ON STRATEGY .................................................................................9 1.10 STRATEGY SCENARIOS AND RESULTING OPTIONS ..........................................................................................9 1.11 PROPOSED WORKS AND COST ESTIMATE ....................................................................................................10 1.12 RECOMMENDED STRATEGY ........................................................................................................................10 1.13 IMPLEMENTATION OF THE STRATEGIC PLAN .................................................................................................11 1.14 SUMMARY AND CONCLUSIONS ....................................................................................................................11 2. INTRODUCTION ...........................................................................................................................12 2.1 OBJECTIVES OF THE STUDY........................................................................................................................12 2.2 BACKGROUND TO THE STUDY .....................................................................................................................13 2.2.1 History of the Study Area.....................................................................................................................13 2.2.2 Need for the Study ..............................................................................................................................14 2.2.3 Overview of the Study .........................................................................................................................14 2.3 SCOPE OF THE STUDY................................................................................................................................15 2.3.1 Recommendation of Policies ...............................................................................................................15 2.3.2 Capture and Analysis of All Data.........................................................................................................15 2.3.3 Construction and Verification of Models of Existing Systems ..............................................................15 2.3.4 Definition of System Loads..................................................................................................................15 2.3.5 Examination of Implementation Options ..............................................................................................16 2.3.6 Assessment of Treatment Capacities ..................................................................................................16 2.3.7 Grand Canal Sewer.............................................................................................................................16 2.3.8 Agreed Scope for the Study ................................................................................................................16 2.4 METHODOLOGY OF THE STUDY ...................................................................................................................16 2.5 CATCHMENT DEFINITION ............................................................................................................................18 2.6 REPORT FORMAT.......................................................................................................................................18 3. THE REGIONAL DRAINAGE POLICIES......................................................................................20 3.1 OVERALL POLICY.......................................................................................................................................20 3.2 NEW DEVELOPMENT POLICY ......................................................................................................................21 3.2.1 Objectives of New Development Policy ...............................................................................................22 3.2.2 Planning Implications ..........................................................................................................................23 3.2.3 Drainage Design..................................................................................................................................24 3.2.4 Specific Recommendations .................................................................................................................24 3.2.5 Further Information..............................................................................................................................25 3.3 ENVIRONMENTAL MANAGEMENT POLICY......................................................................................................25 3.3.1 General Principles ...............................................................................................................................25 3.3.2 Specific Recommendations .................................................................................................................25 3.3.3 Further Information..............................................................................................................................26 3.4 INFLOW, INFILTRATION AND EXFILTRATION POLICY .......................................................................................26 3.4.1 Evidence of Inflow and Infiltration........................................................................................................27 3.4.2 Overall Approach Needed ...................................................................................................................27 3.4.3 General Principles ...............................................................................................................................27 3.4.4 Specific Recommendations .................................................................................................................28 _________________________________________________________________________________________________________________ GDSDS/NEO2057/035C i April 2005 Greater Dublin Strategic Drainage Study Final Strategy Report __________________________________________________________________________________________ 3.4.5 Further Information..............................................................................................................................28 3.5 CLIMATE CHANGE POLICY ..........................................................................................................................28 3.5.1 Climate Change Policy in Ireland.........................................................................................................29 3.6 CLIMATE CHANGE MODEL PREDICTIONS FOR SEA LEVEL AND RAINFALL ........................................................29