MCU14/0028 Appendix 3 chicken-meat-guidelines

This is less than the actual distance of 900 m (west) and 850 m (south).

The required separation distance from the boundary of the village zone:
 Check S2*S3 - > 0.68
 D = (200000/1000)0.63 * 50 * 0.77 *1.0 = 1084 m

This is less than the actual distance of 1200 m and exceeds the minimum requirement of 300 m.

Example 2
Consider the proposed meat chicken farm development described in the previous example. The
maximum number of birds allowed on the site can be calculated.

The factor values are calculated in the same manner as presented in the previous examples.
Maximum bird numbers require calculation for the distance available for each combination of
receptor class/surface roughness category.

Maximum bird numbers (N) = 1000 * (D / (S1 * S2 * S3))1/0.63 = (D / (S1 * S2 * S3))1.59

   Maximum bird numbers for the site (farmhouse north) N = 1000 * (770 / (30 * 0.85 *1.0)) 1.59 =
    225,487 birds.

   Maximum bird numbers for the site (farmhouse west) N = 1000 * (900 / (30 * 1.0 *1.0))1.59 =
    223,163 birds.

   Maximum bird numbers for the site (farmhouse south) N = 1000 * (850 / (30 * 1.0 *1.0))1.59 =
    203,776 birds.

   Maximum bird numbers for the site (village) N = 1000 * (1200 / (50 * 0.77 *1.0))1.59 = 237,146
    birds.

The maximum number of birds allowed on the proposed site is 203 776, with the limitation being
the distance to the farmhouse to the south.

A 2.5            Multiple odour sources and cumulative impacts

Odours from meat chicken farms are complex mixtures of many odorants. The cumulative and
interactive effects of individual odorants are not well understood but it is generally assumed that
where two or more sources of a complex mixture of odorants are located in proximity, the potential
odour impact on sensitive land uses is the sum of the potential individual impact of all odour
sources. This approach is likely to provide a conservative assessment of the potential cumulative
odour impacts.

The necessity of including other odour sources in odour modelling needs to be judged based on
individual site assessments. The major factors influencing the potential interaction of odour plumes
will be:
 size of each facility
 prevailing meteorological conditions and topography of the area
 design and management of each facility.

A simple method for assessing the need to include other facilities in modelling is to use the S-factor
formula (Section 2.3) to calculate separation distance for each facility. The calculated separation
distances essentially approximate the extent of any potential odour impact. Where the ‘odour


Queensland Guidelines Meat Chicken Farms                                                      53