Noosa Springs SMP_Rev 4 · OPW17/0612

ALTUM CONSTRUCTIONS
PRECINCT F & E2 NOOSA SPRINGS DEVELOPMENT




5.        TREATMENT TRAIN OPER ATION AND MAINTENANCE
          In the context of development sites and associated construction and building works,
          delivering water sensitive urban design (WSUD) devices and establishing vegetation can
          be very challenging. Therefore, WSUD devices require a careful construction and
          establishment approach to ensure the devices establish in accordance with their design
          intent. The followings sections outline a recommended staged construction and
          establishment methodology for bioretention basins and infiltration swales as outlined
          within Healthy Waterways Technical Design Guidelines.

5.1       Construction & Establishment

          The following is a proposed staged construction and establishment method:

5.1.1     Functional Installat ion

          Construction of the functional elements of the basins/swales at the end of civil works
          construction and the installation of temporary protective measures.

          For example, using a temporary arrangement of a suitable geofabric covered with shallow
          topsoil (e.g. 25 mm) and instant turf, in lieu of the final basin planting.

5.1.2     Sediment and Erosi on Control

          The temporary protective measures preserve the functional infrastructure of the basins
          and swales whilst providing temporary erosion and sediment facilities through the building
          phase.

5.1.3     Operational Establi shment

          At completion of the building phase, removal of the temporary protective measures along
          with accumulated sediment and the system planted in accordance with the design planting
          schedule.

          Vegetation establishment will be aided based on the following controls:

          Weed control

          Adopting high planting densities and if necessary, applying a suitable biodegradable
          erosion control matting to the basin batters will help to combat weed invasion and reduce
          labour intensive maintenance requirements. A heavy application of seedless hydro-mulch
          can also provide short term erosion and weed control. No matting or hydro-mulch is to be
          applied to the surface of the bioretention basins or infiltration swales following the
          construction phase, as this will hinder filtration of stormwater through the filter media.




Job No. M7130_001                                                                            Page 13
                                                                              Rev 4 : 7 December 2017