MCU14/0106 & OPW15/0001 Compiled Information Request Response

Noosa Civic
Stormwater Management Plan



Table 2-9             C5 Carpark Area Stage-Storage Relationship

     Stage (mAHD)                      Storage (m3)
            8.38                            0
            8.43                           2.55


Table 2-10 presents the resulting pre- and post-developed flows for the range of Average Recurrence
Interval (ARI) flood events. Table 2-11 and Table 2-12 present the maximum discharge from the culverts
crossing beneath Hofmann Drive and the water surface level immediately upstream of these culverts
respectively. Appendix C includes the comparison at various sub-catchments from the site.
Table 2-10 Total Site Discharge

         ARI               Pre-development        Unattenuated            Mitigated        Mitigated
       (Years)                Discharge              Post-                Discharge         Impact
                                                  development
                                (m3/s)                                      (m3/s)           (m3/s)
                                                   Discharge
                                                     (m3/s)
           2                     3.7                     5.0                  3.7             0.0

           5                     4.9                     7.0                  4.3            -0.6

           10                    5.6                     8.0                  5.0            -0.6

           20                    6.5                     9.2                  6.0            -0.5

           50                    7.2                     9.9                  7.2             0.0

          100                    8.2                    10.9                  8.1            -0.1


Table 2-11 Culvert Maximum Discharge Velocity

         ARI               Pre-development            Mitigated           Mitigated        Mitigated
       (Years)                 Velocity                Velocity         Velocity (Low   Velocity (Fauna
                              (Culverts)              (Culverts)         Flow Pipe)         Pass)
                                 (m/s)                  (m/s)               (m/s)            (m/s)
           2                    1.47                    2.09                 1.65            0.00

           5                    1.63                    2.37                 1.79            0.00

           10                   1.78                    2.62                 1.91            0.40

           20                   1.87                    2.77                 1.98            1.41

           50                   1.94                    2.91                 2.05            1.87

          100                   1.96                    3.00                 2.10            2.17




QIC Noosa Civic Pty Ltd                                    Version Final                                  11 May 2015
J13041R2_Final SWMP.docx                               Commercial in Confidence                                Page 6