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Table 4 Conversion Factors to Obtain the
Predicted Noise Level from the Total
Sound Power Levels at Given Distances
distance
(m)
correction
(dB(A))
distance
(m)
correction
(dB(A))
0
14
17 to 18
1
14
19 to 21
2
16
22 to 23
3
18
24 to 26
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30
31
32
33
4
19
27 to 29
34
5
20
30 to 33
35
6
21
34 to 37
36
7
22
38 to 41
37
8
23
42 to 47
38
9
24
48 to 52
39
10
25
53 to 59
40
11
26
60 to 66
41
12
27
67 to 74
42
13
27
75 to 83
43
14
28
84 to 93
44
15 to 16
29
94 to 100
45
For the purpose of
determining the correction
converting from the total sound power level at the
at the NSR,
to be
used for
source to the PNL
to the NSR shall
of 0.5 or more
the distance from the source position be determined to the nearest whole metre, with values being rounded upwards.
For distances
reverberant
This table is only valid for distances of up to 100 m.
greater than 100 m,
or in particularly confined or
situations in which the correction factors given in the table would
not be appropriate, the Authority shall calculate appropriate correction factors having regard to standard acoustical principles and practices.