Technical Memorandum on Noise from Construction Work Other Than Percussive Piling

Table 5 - Correction Factors to Obtain the Predicted Noise Level (PNL) from Sound Power Level at Given Distances
Distance (m) Correction (dB(A))
0 8
1 8
2 14
3 18
4 20
5 22
6 24
7 25
8 26
9 27
10 28
11 29
12 30
13 30
14 31
15 to 16 32
17 to 18 33
19 to 21 34
22 to 23 35
24 to 26 36
27 to 29 37
30 to 33 38
34 to 37 39
38 to 41 40
42 to 47 41
48 to 52 42
53 to 59 43
60 to 66 44
67 to 74 45
75 to 83 46
84 to 93 47
94 to 105 48
106 to 118 49
119 to 132 50
133 to 148 51
149 to 166 52
167 to 187 53
188 to 210 54
211 to 235 55
236 to 264 56

265 to 300

57

 

For the purpose of determining the correction to be used for converting from sound power level at the source to the PNL at the NSR, the distance from the source position to the NSR shall be determined to the nearest whole metre, with values of 0.5 or more being rounded upwards.

This table is only valid for distances of up to 300 m. For distances greater than 300 m the Authority shall calculate appropriate correction factors having regard to standard acoustical principles and practices.

 

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