Distance
(ul)
-
19
-
Table 5
Conversion Factors to Obtain the Predicted Noise Level from Sound
Power Levels at Given Distances
Correction
(dB(A))
Distance
(m)
Correction
(dB(A))
0
8
53 to 59
43
1
8
60 to 66
44
2
14
67 to 74
45
3
18
75 to 83
46
4
20
84 to 93
47
5
22
94 to 105
48
6
24
106 to 118
49
7
25
119 to 132
50
8
26
11
133 to 148
51
9
27
149 to 166
52
10
28
167 to 187
53
11
29
188 to 210
54
12
30
211 to 235
55
13
30
236 to 264
56
14
31
265 to 296
57
15 to 16
32
297 to 333
58
17 to 18
33
||
334 to 373
59
19 to 21
34
374 to 419
60
22 to 23
35
420 to 470
61
24 to 26
36
471 to 527
62
27 to 29
37
11
528 to 592
63
30 to 33
38
593 to 664
64
34 to 37
39
665 to 745
65
38 to 41
40
11
746 to 836
66
42 to 47
41
837 to 938
67
48 to 52
42
939 to 1000
68
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 1 000 m. For
distances greater than 1 000 m the Authority shall calculate appropriate
correction factors having regard to standard acoustical principles and
practices.
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Private notes are available after approval.