Attachment B Green Roof Plan

5       Stormwater Quality Considerations




    Rainfall Data
                                                                                                                                                                             Maintenance Impact on Stormwater Management
    The Monthly rainfall is the total of all available Daily rainfall for the month. Observations of Daily rainfall are nominally made at 9 am local clock time and record
    the total for the previous 24 hours. Rainfall data has been collected at the nearest station approximately 2km from the site in Noosaville.                              The maintenance tasks that will impact on stormwater management and water quality are fertilising and pest control. Consideration of timing of
                                                                                                                                                                             applications, frequencies and rates is important to prevent contamination of stormwater runoff that can pollute nearby water resources.

                                                                                                                                                                             Fertilising:
                                                                                                                                                                             Fertilising during the establishment period (2-5 years) should occur prior to the growing seasons and consider months of high rainfall. According to
                                                                                                                                                                             Table 1, Noosaville Monthly Rainfall, the highest rainfall occurs between the months of December and March, during summer.
                                                                                                                                                                             Fertilising should occur bi-annually. One application at the beginning of spring, (Sept) during low rainfall and at the start of the growing season. A
                                                                                                                                                                             second application should be applied approximately 6 months later (March-April) following months of high rainfall to replenish the substrate after
                                                                                                                                                                             probable leaching of nutrients during the wet season. Post establishment, fertilising can be reduced to respond to plant growth and due to careful
                                                                                                                                                                             species selection may not even be required.

                                                                                                                                                                             Use of Pesticides / Herbicides:
                                                                                                                                                                             It is recommended that weeds are removed by hand to avoid the use of herbicides and reduce contamination of stormwater. If adequate plant cover
                                                                                                                                                                             is achieve weeding will be minimal.
                                                                                                                                                                             The use of pesticides should be limited where possible and only organic pesticides used.

                                                                                                                                                                             The impact of maintenance on stormwater can be minimised using plant species endemic to the site. As previously mentioned plant species
                                                                                                                                                                             endemic to the site are stronger and more competitive specimens that will provide greater site coverage and therefore reduce weed infestation.
                                                                                                                                                                             These plant species are also likely to be more resistant to pest and disease reducing the need for the use of chemicals.




    Table 1- Noosaville Monthly Rainfall Data by Australian Government Bureau of Meteorology
    www.bom.gov.au




                                                                                                                                                                                                                                                                                    Green Roof Proposal
                                                                                                                                                                                                                                                                                                       Date : 24.09.2014
                                                                                                                                                                                                                                                               Hasler Residence, Seaview Terrace                                  A