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Den Brook Amplitude Modulation Condition
Author: | Noise, Regulations, U.K.
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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.
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