Response to Information Request - MCU12/0184

                                                                                        ~
                                                                                    Callaghan & Toth

The Bioretention Basin provided for Catchment K and N will be 55m2 in area and will be
planted with effective nutrient removal plants. The basin will be 10m long and 5m wide. It
will have an extended detention depth of 0.3m and a filter depth of 0.5m.


Vegetated Buffers are provided for Catchments A, B, D, E, I, L, M, 0, P, Q, R, S, V, W1 and
X. Buffers will be 5m wide for the length of each catchment and flow from the catchments
will be sheet flow into the buffers.


Rainwater Tanks have been provided for the total roof catchments as shown on Plans No
1209-02 to 1209-05. 100% of the new eight sheds roof area of 1.39 hectares will be
connected to thirty two rainwater tanks. Each tank will have a capacity of 50,000 litres.


It is estimated by Inghams Queensland that in summer each shed will require 13,000 litres
for the cool shed pads cells and a average 9,819 litres for drinking water (ROSSTable 7)
i.e., 22,819 litres total daily use for 30,000 chickens (average shed size) therefore allow a
average 22,819 litres per shed per day. It is noted that sheds are not stocked all of the year
as there is a two week cleaning period after 7 weeks growing. As such the sheds are

stocked 71 % of the year.
Therefore Total water requirements are:


      .
           22,819Iitres/shed/day x 8 sheds x 0.71=Total daily use of 130,394Iitres.
      .    Total monthly use of 3,955,293 litres.


3.2.3      Rainfall Data


The meteorological data used for the MUSIC Model was the data for Cooroy from 01/01/92               -




31/12/01. The mean Annual Rainfall for Cooroy                    92   -
                                                                          02 = 1585mm


The MUSIC Modelling Guidelines for South East Queensland           -
                                                                      Version 1 December 2010
details that Cooroy data for 1973 to 1983 should be used. This data has an annual average
Rainfall of 1600mm. It is considered that the 10 year period from 1992         -
                                                                                   2002 has a
relatively close mean annual Rainfall to the recommended 10 year period and as such is
acceptable to use in this case.

3.3        MUSIC Modelling Results


The MUSIC modelling program has been used to investigate the performance of various
treatment options in the treatment train. MUSIC version 5 is capable of incorporating
rainwater re-use in the model. These features have been used in making comparisons
between different stormwater management systems for this report.



3.3.1      Water Quality Objectives


This model meets the pollution load reduction target as detailed in Water by Design Deemed
to Comply Solutions         -
                                Stormwater Quality Management (South East Queensland) version
1.0   -
          Table A-2. The following have been included in Appendix 3.


           .     The treatment train effectiveness for the system.
           .     The MUSIC Version 5 Summary Report.
The information above indicates that the additions to the farm and the proposed stormwater
treatment train will achieve reductions in pollutant loads as detailed in Table 3.2 below.


                                                                                                14
1209 Animal Husbandry   Top Forestry Rd, Ridgewood
                        -
                                                                                        SWQMP
April 2013