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Den Brook Amplitude Modulation Condition  

Author:  | Noise, Regulations, U.K.

Den Brook Timeline:

2005  –  RES submit planning application to West Devon Borough Council (WDBC) for nine wind turbines in the Den Brook valley between Bow, Spreyton and North Tawton
2006 Jan  –  WDBC refuses planning permission
2006 May  –  RES file Planning Appeal
2007 Feb  –  Planning Inspector grants planning permission
2007 Mar  –  Mike Hulme lodges Judicial Appeal
2008 Mar  –  Judicial Appeal refused by High Court
2008 Apr  –  Hulme appeals to Court of Appeal
2008 Aug  –  Court of Appeal requires redetermination of Planning Appeal by Inspector
2009 Dec  –  Inspector grants planning permission with conditions
2010 Jan  –  Hulme lodges appeal to Court of Appeal
2011 May  –  Court of Appeal upholds planning permission and conditions
2013 Apr  –  RES applies to amend AM conditions (see 2012 RES presentation on AM, tonality and impulses)
2013 Aug  –  RES withdraws application to amend AM conditions
2014 Feb  –  RES submits scheme for complying with AM conditions
2015 Aug  –  RES begins construction

The “Den Brook Amplitude Modulation Condition”:

Excess amplitude modulation was defined in condition 20 of the December 2009 planning permission as any change, upon complaint, outside the dwelling, in LAeq,125ms of >3 dB in any 2-second period ≥5 times in any minute with LAeq,1min ≥28 dB and such excess occurring in ≥6 minutes in any hour.

“LAeq,125ms” is the equivalent A-weighted continuous sound level (average) over a 125-millisecond period, “LAeq,1min” over a 1-minute period.

In other words, a 125-ms pulse of 3 dBA or greater (3 dB being the difference in noise level detectable by the human ear) can not occur in any 2-second period five or more times in six or more minutes of any hour, when those minute-long average noise levels are 28 dBA or more.

This article is the work of the author(s) indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

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