F. Geology & Hydrology ( PDF | 31.0 MB ) - RWE.com

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The maps are based on information provided by the Environment Agency and the British Geological Society. The maps contain three development advice zones which are attributed to different planning actions, see Table F1.1 below. Table F1.1 TAN15 Development Advice Zones Description of Zone Use within the precautionary framework A Considered to be a little or no risk of fluvial or coastal/tidal flooding B Areas known to have been flooded in the past evidenced by sedimentary deposits C Based on Environment Agency extreme flood outline, equal to or greater than 0.1% (river, tidal or coastal) C1 Areas of the floodplain which are developed and serviced by significant infrastructure, including flood defences. C2 Areas of the floodplain without significant flood defence infrastructure. F1.11 THE CIVIL CONTINGENCIES ACT, 2004 AND THE CLIMATE CHANGE ACT 2008 The Civil Contingencies Act 2004 (Contingency Planning) Regulations 2005 affords powers and responsibilities to Category 1 and 2 Responders for significant event situations, which includes flooding in addition to matters such as terrorist threat. Responders have defined responsibilities under the Act, which represent compliance requirements. Requirements concerning adaptation to climate change, including flood risk adaptation, have also been introduced through the Climate Change Act 2008. Requirements for reporting on adaptation risks and capabilities are currently available in consultation draft for defined ‘Reporting Authority’ categories which include public and private bodies. F1.12 DENBIGHSHIRE COUNTY COUNCIL UNITARY DEVELOPMENT PLAN (2002) Development policies of relevance in terms of geology, water resources and flooding are listed below. • ENP 1: Pollution • ENP 3: Water Resources • ENP 4: Foul and Surface Water Drainage • ENP 6: Flooding • ENP 7: Unstable Land • ENP 8: Contaminated Land ENVIRONMENTAL RESOURCES MANAGEMENT RWE NPOWER RENEWABLES LTD F7
F1.13 CLWYD STRUCTURE PLAN SECOND ALTERATION (CONWY VERSION) (1999) Development policies of relevance in terms of geology, water resources and flooding are listed below. • CONS 10: Planning permission will not be granted for development that is likely to have an adverse affect on the nature conservation or other scientific value of sites of special scientific interest. • CONS 18: Development will be allowed in coastal areas or areas adjacent to rivers, subject to other structure plan policies, unless one of the following apply: A. There would be an unacceptable risk to flooding. B. There would an unacceptable increase in the risk of flooding elsewhere. C. The capability of the coast to form a natural sea defence would be prejudiced. D. Additional public finance would be required for coastal or riparian defence works other than that necessary to protect existing investment. E. The development would adversely affect existing or new flood defence operations. F1.14 POLLUTION PREVENTION GUIDELINES Pollution Prevention Guidelines (PPGs) have been jointly produced by the environmental regulatory authorities within the UK. PPGs of relevance to this project are referenced below. • PPG01 General guide to the prevention of water pollution. • PPG05: Works and maintenance in or near water. • PPG06: Working at construction and demolition sites. • PPG20: Dewatering underground ducts and chambers. • PPG21: Pollution incident response planning. ENVIRONMENTAL RESOURCES MANAGEMENT RWE NPOWER RENEWABLES LTD F8
Page 1 and 2: Annex F Geology and Hydrology • F
Page 3 and 4: F1 WATER RESOURCES AND FLOODING - L
Page 5 and 6: After the GQA has been conducted, a
Page 7: Protection Zones (SPZs) across Engl
Page 11 and 12: CONTENTS 1 INTRODUCTION 1 2 ASSESSM
Page 13 and 14: 2 ASSESSMENT METHODOLOGY 2.1 INTROD
Page 15 and 16: • Each peat probing location was
Page 17 and 18: 3 RESULTS 3.1 DESK STUDY RESULTS 3.
Page 19 and 20: lower horizon. From these soil seri
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Page 23 and 24: y their peat-forming vegetation). I
Page 25 and 26: Table 3.2 Peat survey results at pr
Page 27 and 28: BGS superfiical Phase 1 Turbine NSR
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Page 33 and 34: 3.2.4 Peat Loss Calculations Direct
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Page 37 and 38: 4 RECOMMENDED MITIGATION MEASURES 4
Page 39 and 40: Appendix 1 CCW Consultation
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Page 51 and 52: CADEIRYDD/CHAIRMAN: JOHN LLOYD JONE
Page 53 and 54: Peat depth Peat depth is some refec
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It would be useful to define what i
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• If peat is identified through d
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1 PHOTOLOG OF SURVEY LOCATIONS Figu
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Figure 1.5 Turbine 4 Figure 1.6 Tra
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Figure 1.9 Track past Turbine 7 Fig
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Figure 1.13 Turbine 11 - Dense fore
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Figure 1.17 Turbine 13 Figure 1.18
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Figure 1.21 Turbine 19 Figure 1.22
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Figure 1.25 Track past Turbine 25 F
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Appendix 3 Detailed Results Figures
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KEY: 0.15m 0.08m 0.2m 0.28m 0.18m 0
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KEY: Development Area Turbine Sampl
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KEY: TURBINE 4 Development Area Tur
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KEY: Development Area Turbine Sampl
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KEY: TURBINE 22 Development Area Tu
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KEY: TURBINE 26 Development Area Tu
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KEY: 0.2 0.12 Development Area Turb
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National Soil Resources Institute S
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National Soil Resources Institute A
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National Soil Resources Institute 1
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Annex F4 Flood Consequences Assessm
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Flood Consequences Assessment - Clo
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Contents Executive Summary ........
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1 Introduction 1.1 Objectives Walli
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Runoff rates under 100-year storm t
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2 Description of the Site 2.1 Backg
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Steep channel with forest debris cl
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Figure 3 Location of proposed turbi
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2.4 Catchment Delineation An assess
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Outfall grid reference Total catchm
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Tests were attempted at two sites w
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The long term impacts on the surfac
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4 Flood Consequences Assessment 4.1
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4.3 Current Flood Risk In summary,
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Analyses are not presented for the
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WRAP fractional extents of 0.75 WRA
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5.3 Calculation of Existing Greenfi
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Afon Alwen No. 3 Afon Alwen No. 4 R
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1. Do nothing - on the grounds that
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5.6 Construction Appropriate method
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On the basis of a literature review
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Robinson, M. and Dupeyrat, A. 2005.
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Clocaenog Methodology and reasons f
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Clocaenog Methodology for mineral s
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Clocaenog Methodology for mineral s
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1.1 OVERVIEW CLOCEANOG WIND FARM BO
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Table1.1 Forest and Water Guideline
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Table 1.2 Borrow pit search areas S
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Table 1.3 Recommended borrow pit lo
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Name Easting Northing Search Area N
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360000 .000000 359000 .000000 35800
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