Draft National Wind Farm Development Guidelines - July 2010

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Regression analysis should be carried out for each category (e.g. wind direction, time of day, etc) according to Section 6.3.4 of AS4959–2010. Where the different regression curves are within 1-3dB of the regression curve for all data at each integer wind speed, significant variation in background noise level with wind direction is not considered likely and the noise limits should be determined using all the data. Note: To avoid excessive analysis, the aim should be to determine the worst-case criteria where this is due to a systematic variation on the distribution of background sound level vs. wind speed due the factors mentioned above. Where the variation is greater than 3dB, some variation in background noise level with the selected category is likely and that category should be analysed separately. The same analysis process described above should also be used to establish noise level limits for stakeholder properties with agreed alternative noise level limits. The minimum noise level limit should be corrected as per the agreement with the stakeholder, within the upper bounds discussed in Section B.4.1 Establish noise criteria (page 45). Application of noise level limits in the case of cumulative development is discussed in Section B.5. Undertake a tonality assessment Tonality should be assessed as part of the noise impact assessment, based on tonality tests included in IEC 61400-11: 2006, or other tonality assessment approved by the relevant authority. Undertake noise emission predictions (detailed) As suggested by the flow chart in Appendix A of AS4959–2010, further wind farm noise emission predictions should be carried out once noise level limits have been established at all relevant receivers. • Updating preliminary noise emission predictions The wind farm layout is likely to have changed significantly since the time of the preliminary predictions, and the detailed noise emission predictions can be used to optimise the noise received noise levels and to reflect the final layout • Detailed noise emission predictions Detailed prediction methods should be implemented according to Section 5.3 of AS4959–2010. Predictions should be carried out for each nominal wind speed at intervals of 1m/s between the cut-in wind speed and the rated wind speed. The modelling assumptions should reflect typical (but not extreme) ‘worst case’ meteorological conditions for sound propagation towards the receiver. The relevant authority should be consulted to identify any specific requirements for modelling assumptions. All modelling assumptions should be clearly stated. Where ISO 9613-2 is used, 7 the parameters provided in Table B-3 are likely to provide a generally realistic and conservative assessment of noise emission. It is acceptable to use alternative parameter values. For example, reasonable worst case temperature and humidity levels may be determined from review of annual meteorological data from the Bureau of Meteorology. However, a clear explanation for the reasons for changes in parameters should be provided. The use of a single value to represent air absorption across the entire frequency spectrum is not considered suitable for detailed noise emission prediction unless 7 International Standards Organisation (1996) Acoustics – Attenuation of sound during propagation outdoors Part 2: General method of calculation. ISO 9613-2:1996, Geneva, Switzerland. Page 52 Draft National Wind Farm Development Guidelines – 2 July 2010
predicted levels are significantly below the noise level limits. Octave band or one-third octave band air absorption coefficients are preferred. Draft National Wind Farm Development Guidelines – 2 July 2010 Page 53
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EPHC National Wind Farm Development
Page 5:
Acknowledgements These Guidelines h
Page 8 and 9:
A.6.1 Site selection 28 A.6.2 Proje
Page 10 and 11:
E.7 Technical discussion of key con
Page 12 and 13: The 20/20 target is challenging; ho
Page 14 and 15: Table 1-1 Elements of a ‘wind far
Page 16 and 17: 2 Principles for responsible wind f
Page 18 and 19: 3 Wind Farm Specific Issues The spe
Page 20 and 21: Specific noise limits are not provi
Page 22 and 23: 3.5 Shadow flicker The issue Shadow
Page 24 and 25: Guidance notes Heritage issues are
Page 26 and 27: Table 4-1 Typical decision process
Page 28 and 29: The studies and community consultat
Page 31 and 32: A Community and Stakeholder Consult
Page 33 and 34: • Responsive There is a comm
Page 35 and 36: Figure A-1 IAP2 Public Participatio
Page 37 and 38: Specific components which should be
Page 39 and 40: Figure A-2 Example of Good Practice
Page 41 and 42: Recording the occurrence and outcom
Page 43 and 44: A.6.6 Decommissioning Planning & Co
Page 45 and 46: Potential Stakeholders Consultation
Page 47 and 48: B Noise B.1 Introduction This Appen
Page 49 and 50: the converse. These Guidelines reco
Page 51 and 52: The Standard should form the basis
Page 53 and 54: Stage and methodology Construction
Page 55 and 56: Other noise-sensitive uses such as
Page 57 and 58: Table B-2 Existing state and territ
Page 59 and 60: Establish background noise monitori
Page 61: As noted in Section 6.3.1 of AS4959
Page 65 and 66: Prepare expert evidence (as require
Page 67 and 68: Undertake unattended monitoring to
Page 69 and 70: assessment of wind farm noise emiss
Page 71 and 72: B.4.5 Decommissioning Noise-related
Page 73 and 74: If a significant amount of time has
Page 75 and 76: B.7 Technical discussion of key con
Page 77 and 78: The HGC Engineering report 10 also
Page 79 and 80: C Landscape C.1 Introduction This A
Page 81 and 82: • Cumulative impacts “Cumulativ
Page 83 and 84: C.2 Overview of Methodologies Figur
Page 85 and 86: C.3 Task Methodologies C.3.1 Projec
Page 87 and 88: • State Relevant State herita
Page 89 and 90: The preliminary landscape character
Page 91 and 92: • Identifying and describing (in
Page 93 and 94: Advanced photomontages should also
Page 95 and 96: C.4.2 Visual Impact Assessment The
Page 97 and 98: C.4.2.4 Assessment of cumulative im
Page 99 and 100: the implementation of agreed change
Page 101 and 102: Figure C-2 IBRA mapping of Australi
Page 103 and 104: Table C-4 Mapping of landscape char
Page 105 and 106: C.7.2 Levels of significance What a
Page 107 and 108: Consider ‘Supporting Evidence’
Page 109 and 110: information available for other sit
Page 111 and 112: Figure C-4 Example of viewshed mapp
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Figure C-6 Example of photomontages
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communicate broad-scale ideas and p
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Table C-5 Mapping other wind farms
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C.7.9 Glossary & acronyms Australia
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Viewpoint The point from which a vi
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D.1.2 Underlying approach The under
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All of the above is generally appli
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the operational wind farm is aimed
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D.4 Task methodologies D.4.1 Site S
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area as it was not collected accord
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used throughout these Guidelines as
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wind farms. Such data from existing
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considered acceptable, undesirable,
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construction phase are identified d
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Searches for dead birds and bats ar
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D.5 Cumulative impacts D.5.1 Defini
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in the absence of any turbine colli
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that it was first observed. Where m
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e the case that assessment for bats
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Department of Primary Industries, W
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Percival, S.M. 2003, Birds and wind
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E Shadow Flicker E.1 Introduction T
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• The use of recreational facilit
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• The method is inherently linked
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Table E-1 Recommended exposure limi
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E.4.4 Construction Assessment of th
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E.7 Technical discussion of key con
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Figure E-4 Variation in shading wit
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common practice varies between one
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as the actual limit, rather than th
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likely to be obstructed. Radiocommu
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Licensed radiocommunications servic
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Figure F-1 EMI mitigation methodolo
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F.4 Task methodologies F.4.1 Projec
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Expected timeframe for evaluation r
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The near field zone can be calculat
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Develop mitigation strategy As a st
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aseline RF survey which involves th
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G Wind Farm Development Process G.1
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Project Sub-stages Activities to be
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Preliminary Technical Studies Issue
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Planning application (PA2) The plan
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Develop mitigation strategy Finalis
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Environmental Management Plans Issu
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Monitoring: confirmation (O3) Confi
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Decommissioning (D2) Once a decisio
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Draft National Wind Farm Development Guidelines - July 2010

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