Noosa Springs SMP_Rev 4 · OPW17/0612

ALTUM CONSTRUCTIONS
PRECINCT F & E2 NOOSA SPRINGS DEVELOPMENT



          each device. Parameters used for the proposed bioretention basins are provided in Table
          4.2.

          Table 4.2 Adopted Bioretention Basin Parameters

            Bioretention Basin                          Extended Detention
                                      Filter Area                             Filter Media Depth
                    ID                                        Depth

                    Basin 1             100 m2

                    Basin 2             42 m2                 0.2 m                 0.4 m

                    Basin 3             40 m2


4.2.2     Infiltration Sw ales

          Infiltration Swales 1, 2 and 3 will only receive inflows from direct runoff of contributing
          catchments. The flows from Swales 2 and 3 will also discharge into Bio-retention Basin 2.

          Infiltration Swale parameters have been adopted using the WSUD Technical Design
          Guidelines for South East Queensland and the Water by Design MUSIC Modelling
          Guidelines for Southeast Queensland, with the exception of the exfiltration rate applied to
          each device. Parameters used for the proposed infiltration swales are provided in Table
          4.3.

          Table 4.3 Adopted Infiltration Swale Parameters

            Infiltration Swale ID      Length           Base Width      Swale Grade     Swale Depth

              Infiltration Swale 1      120 m                                1%

              Infiltration Swale 2      147 m               1m               0.5%           0.3 m

              Infiltration Swale 3      100 m                                0.5%


4.3       Stormw ater Harvesting

          Condition 46 states that roofwater runoff from any new building should be directed to a
          rainwater storage systems or tank. The proposed design incorporates a 60,000L below
          ground tank that has been sized by the landscaper to intermittently supplement irrigation
          requirements with captured stormwater. In extended dry periods the tank will be topped up
          by a water bore. From a stormwater engineering perspective, it is not necessary for all
          new buildings to direct roofwater to storage tanks. The proposed design still complies with
          the broad intent of condition 46 as the volumes of water caught are substantial and
          captured stormwater will be used for irrigation of landscaped areas.



Job No. M7130_001                                                                                           Page 8
                                                                                            Rev 4 : 7 December 2017