Stormwater management plan 20220156 9 Kauri St SWMP

 Dichelachne crinita                              Long Haired Plume Grass             Tufted                   200       6-8
 Erograstis elongata cv ‘Elvera’                  Elvera                              Tufted                   300       6-8
 Imperata cylindrica                              Blady Grass                         Tufted                   500       4-6
 Lepidosperma laterale                            Variable Sword Sedge                Tufted                   750       8-10
 Lomandra confertifolia                           Matting Lomandra                    Tufted                   300       4-6
 Lomandra confertifolia subs pallida              Mat Rush                            Tufted                  400        4-6
 Lomandra longifolia                              Matt Rush                           Tufted                 1000        4-6
 Lomandra longifolia cv 'Tanika'                  Tanika                              Tufted                   500       4-6
 Poa labillardiere cv ‘Eskdale’                   Eskdale                             Tufted                   450       6-8
 Themeda australis                                Kangaroo Grass                      Tufted                   400       6-8
 Themeda australis cv ‘Mingo                      Mingo                               Tufted                   200       8-10




          4.2.2 MUSIC modelling results
The proposed treatment train for each site can achieve the required water quality improvements as shown below in
Table 4.5 - MUSIC Modelling results. As the pollutant generation is estimated using stochastic generation, the
pollutant loads can vary between runs however the below results are representative of the compliance achieved by
the treatment train.

                                                    Table 4.5 - MUSIC Modelling results

  Pollutant                                   Sources            Residual             Percentage          Percentage               Complies
                                                                 Load                 Target              Reduction

  Total Suspended Solids (kg/yr)                490.944              60.267                 85                     87.72                  Yes

  Total Phosphorus (kg/yr)                        0.979               0.273                 65                     72.13                  Yes

  Total Nitrogen (kg/yr)                          5.493               2.969                 45                     45.95                  Yes

  Gross Pollutants (kg/yr)                       53.402                  0                  90                     100                    Yes



          4.2.3 Maintenance Requirements
Periodic maintenance and monitoring of stormwater infrastructure proposed for this development should be
carried out to ensure they are operating effectively during the post-construction phase. After the on-maintenance
period, the responsibility for these maintenance activities shall be the body corporate for the site who may appoint
a suitably qualified maintenance contractor or caretaker to undertake these activities.

The field inlet grates, pits and underground pipes shall be inspected for blockage or damage at least 6 monthly or
after significant rainfall event. Any blockages shall be cleared from the system, and damage assessed to determine
if it impacts on the function of the system or may pose a hazard that will require repair.

The bioretention areas shall be maintained following a schedule of routine inspections undertaken after every
significant rainfall event (30mm of rainfall in a 24-hour period) or on a three (3) monthly basis within the first twelve
(12) months and on a six (6) monthly basis thereafter. The inspection shall ensure the proper functioning and
condition of the bioretention area and ensure that the planting and vegetation health is suitably maintained. An
inspection checklist from the Healthy Waterways Technical Design Guidelines for Southeast Queensland has been
provided in Appendix Bioretention Garden Inspection Checklist that provides the structure for the inspections to
be undertaken.

In addition to regular inspections, the first 4 months of establishment of the bioretention areas requires a watering
frequency of:

                                                                                 i.        Week 1 - 6 - 5 times per week
Project number 20220156
File RECOR Stormwater Management Report - 20220156.docx, 2022-08-08 Revision 0                                                  Page 16 of 26

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