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Chapter 15 Road Drainage and the Water

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Chapter 15 Road Drainage and the Water CHAPTER 15 ROAD DRAINAGE AND THE WATER ENVIRONMENT Cross Tay Link Road Revision Date Status Author Technical Checker Approver Number Reviewer P01.1 10.07.19 WORK IN E. REID, J J. PRESTON, R. McLEAN C. CARDNO PROGRESS WALKER J. MOORE P01 15.11.19 S4 FOR E. REID, J J. MOORE R McLEAN D. RITCHIE STAGE WALKER APPROVAL BIM Reference: 119046-SWECO-EWE-000-RP-EN-20016 This document has been prepared on behalf of Perth and Kinross Council by Sweco for the proposed Cross Tay Link Road Project. It is issued for the party which commissioned it and for specific purposes connected with the above-captioned project only. It should not be relied upon by any other party or used for any other purpose. Sweco accepts no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. Prepared for: Prepared by: Perth and Kinross Council Sweco Pullar House Suite 4.2, City Park 35 Kinnoull Street 368 Alexandra Parade Perth Glasgow PH1 5GD G31 3AU CONTENTS 15 ROAD DRAINAGE AND THE WATER ENVIRONMENT ...................................................... 1 15.1 Executive Summary ................................................................................................................ 1 15.2 Introduction ............................................................................................................................. 1 15.3 Scope of Assessment ............................................................................................................. 2 15.4 Methodology ........................................................................................................................... 7 15.5 Baseline Conditions ..............................................................................................................17 15.6 Potential Effects ....................................................................................................................30 15.7 Mitigation and Enhancement ................................................................................................51 15.8 Residual Effects ....................................................................................................................60 15.9 Cumulative Effects ................................................................................................................61 15.10 Summary of Effects ..............................................................................................................62 15.11 Statement of Significance .....................................................................................................76 FIGURES Figure 15.1: Water Environment and Mitigation ....................................................................................... 19 Figure 15.2: 200 year Flood Extents (Baseline) ....................................................................................... 44 Figure 15.3: 200 year Flood Extents (with Scheme) ................................................................................ 57 TABLES Table 15.1: Summary of Consultations and Actions Taken ....................................................................... 3 Table 15.2: Criteria for assessing Baseline Sensitivity .............................................................................. 9 Table 15.3: Criteria for assessing Impact Magnitude ............................................................................... 11 Table 15.4: Criteria for assessing Impact Significance* ........................................................................... 13 Table 15.5: Overview of Watercourses .................................................................................................... 20 Table 15.6: Summary of Watercourse Sensitivity .................................................................................... 22 Table 15.7: Summary of Construction Activities in/near each Watercourse ............................................ 30 Table 15.8: Proposed Drainage Outfall Locations ................................................................................... 47 Table 15.9: Summary of Routine Runoff Assessment (soluble pollutants) .............................................. 48 Table 15.10; Summary of Routine Runoff Assessment (sediment pollutants) ......................................... 50 Table 15.11: Summary of Spillage Risk Assessment .............................................................................. 51 Table 15.12: Indicative Pollutant Reduction Factors used for HAWRAT assessment ............................. 58 Table 15.13: Summary of the Simple Index Approach (CTLR carriageway) ........................................... 59 Table 15.14: Summary of Effects on RDWE sub-topics .......................................................................... 64 APPENDICES Appendix 15.1: Baseline Water Environment Appendix 15.2: Flood Risk Assessment Appendix 15.3: DMRB Routine Runoff / Spillage Risk Assessment Appendix 15.4: Engineering Activities CHAPTER 15 CROSS TAY LINK ROAD ROAD DRAINAGE AND THE WATER EIA REPORT (VOLUME 2) ENVIRONMENT 15 ROAD DRAINAGE AND THE WATER ENVIRONMENT 15.1 EXECUTIVE SUMMARY This chapter provides an assessment of the effects of the proposed Cross Tay Link Road (CTLR) Project on the surface water environment, during both construction and operational phases. The assessment also considers road drainage provision of the operational scheme and potential effects to receiving watercourses. The main watercourse in the study area is the River Tay, which is a designated Special Area of Conservation (SAC) for its populations of Atlantic salmon, lamprey species, freshwater pearl mussel and otter, as well as being a sensitive freshwater habitat. As such it is of very high sensitivity. The baseline conditions and potential effects were assessed by means of desk-based assessment, a river reconnaissance survey and consultations, as well as hydraulic modelling and drainage assessments following DMRB procedures. One of the greatest risks to the water environment and aquatic ecology is of silt-laden and contaminated runoff entering the River Tay SAC directly from works on the banks, as well as the cumulative effects of in-channel works in nearby tributaries during the construction phase. However, these construction works will be subject to a number of control and management measures, and in particular construction site licensing under the Controlled Activities Regulations. Following implementation of best practice and site-specific mitigation measures during construction and operation detailed in this chapter, all residual effects are predicted to reduce to no more than minor magnitude and Slight significance, and therefore not significant in the context of the EIA Regulations. 15.2 INTRODUCTION This chapter provides an assessment of the effects of the proposed CTLR Project on various sub-topics of the surface water environment; namely hydrology and flood risk, fluvial geomorphology, water quality and drainage during both construction and operational phases. These sub-topics can be defined as: • Hydrology and Flood Risk – the flow of water on or near the surface. Flooding has many sources including coastal, river (fluvial), surface water (pluvial), sewer and groundwater. • Fluvial Geomorphology – landforms associated with river channels (channel morphology) and the fluvial and sediment transport processes which form them (fluvial processes and sediment regime). • Water Quality – various attributes of watercourses and water bodies including water quality and supply, biodiversity, dilution and removal of waste products and recreation. • Drainage – a system of collecting overland or underground waters, often by channels, drains and sewers to a point of discharge or treatment. These sub-topics are closely linked and are also linked to ecological receptors (Chapter 9: Biodiversity) and groundwater and contaminated land (Chapter 10: Hydrogeology and Soils). Baseline characteristics and potential effects of the proposed CTLR Project, as well as any associated mitigation, is often applicable to these interrelated topics and cross-referencing has been added throughout this chapter where relevant. November 2019 PAGE 1 OF CHAPTER 15 CHAPTER 15 CROSS TAY LINK ROAD ROAD DRAINAGE AND THE WATER EIA REPORT (VOLUME 2) ENVIRONMENT This chapter is supported by the following figures and appendices: • Figure 15.1: Water Environment and Mitigation; • Figure 15.2: 200 year Flood Extents (Baseline); • Figure 15.3: 200 year Flood Extents (with Scheme); • Appendix 15.1: Water Environment Baseline Conditions. Provides the baseline of the water environment for the proposed CTLR Project • Appendix 15.2: CTLR Flood Risk Assessment Report. A report detailing the flood risk and associated modelling as a result of the proposed CTLR Project • Appendix 15.3: Water Quality Calculations. Provides calculations undertaken with the HAWRAT model to determine the impact of the proposed CTLR Project on the water quality • Appendix 15.4: Engineering in the Water Environment. Provides information on the watercourse crossings (bridges and culverts) that are to be constructed or modified as part of the proposed CTLR Project, including justification for each engineering option and reasons for rejection of alternatives 15.3 SCOPE OF ASSESSMENT 15.3.1 Study Area The general study area for the water quality and geomorphology assessments was up
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