H - Revised Integrated Water Management Plan by Cardno (inc MUSIC file) (13.09.19)

                                                                                    Integrated Water Management Plan
                                                                            Noosa Marketplace : 2-20 HOFMANN DRIVE



5.3         Model Results
The proposed storage system was incorporated in the XP-RAFTS model which was run for the same events
as discussed previously. The peak discharges from the site for pre-development conditions and for post-
development conditions, with the rainwater storage included are shown in Table 5-3.
Table 5-3     Peak XP-RAFTS Discharge
                                                     Peak Flow Rate
 Event          Pre-Development Peak Discharge (m3/s)          Post-Developed (Mitigated) Peak Discharge (m3/s)
 (AEP)          (Site Only)                                    (Site Only)
      1%                             0.74                                            0.28
      2%                             0.61                                            0.27
      5%                             0.49                                            0.28
      10%                            0.41                                            0.25
      20%                            0.35                                            0.19
      39%                            0.29                                            0.16

As shown above, the proposed tank results in a decrease in peak discharges from the site for all AEP events
modelled in the mitigated developed scenario. Table 5-4 shows the storage volume for each modelled event.
Table 5-4     Tank Storage Volume
 AEP Event         Volume (m3)
 1%                    1341
 2%                    1212
 5%                    1284
 10%                   1116
 20%                    776
 39%                    619




V190428 | 10 September 2019 | Commercial in Confidence                                                           15