Appendix F - SBSMP

5.2.4     Pre- and post-development (with mitigation) peak flow rates comparison
The table below summarises the pre- and post-developed (mitigated) design flow rates off the Development
Area.
Table 4- Comparison of Pre- and Post-Development (Mitigated) Peak Flow Rates

                                    Q1          Q2          Q5          Q10
                                                                                   Q20         Q50         Q100
                        Area       (63%        (50%        (20%        (10%
                                                                                (5% AEP)    (2% AEP)    (1% AEP)
                        (ha)       AEP)        AEP)        AEP)        AEP)
                                                                                  (m3/s)      (m3/s)      (m3/s)
                                  (m3/s)      (m3/s)      (m3/s)      (m3/s)

 Development Area
                        0.415     0.059       0.089       0.115       0.140       0.167       0.198       0.222
  (Pre-Development)

 Development Area
                        0.415     0.057       0.067       0.079       0.087       0.134       0.195       0.222
  (Post-Development)

        Increase                  0.005       -0.022     -0.046      -0.060      -0.038       -0.006      -0.000
                                  (-3%)       (-25%)     (-31%)      (-37%)      (-20%)        (-2%)       (0%)


Results show that after mitigation, compared to existing condition, there is no increase in post-development design
flow rates off the Development Area.




 BR210522_SBSMP_Rev3.docx                                                                                   Page 11 of 25