1909-13367 SRA referral response approved docs

          Table 6 – Individual mitigated catchment discharge


   AEP                                               Peak Flow Rate (L/s)
  Storm
  Event          Existing      Mitigated           Existing       Mitigated      Existing      Mitigated
               Catchment 1    Catchment 1        Catchment 2     Catchment 2   Catchment 3    Catchment 3

   1EY            1333               1179            432                68        915                374

  0.5EY           1972               1453            579                71        1292               425

  0.2EY           2173               1500            677                74        1471               451



3. 6     Cr iti c al St o rm Du r at i ons

The critical durations for each event (modelled using XPSTORM) for the existing, developed and
mitigated scenarios are presented below in table 6.

          Table 7 – Critical Durations

                                                        Critical Duration
 AEP Storm
   Event
                          Existing                         Developed                     Mitigated

       1EY               30 Minute                         10 Minutes                    30 Minute

       0.5EY             10 Minute                         10 Minutes                    30 Minute

       0.2EY             10 Minute                         10 Minutes                    30 Minute

       10%               10 Minute                         15 Minutes                    30 Minute

        5%               10 Minute                         15 Minutes                    30 Minute

        2%               10 Minute                         10 Minutes                    30 Minute

        1%               10 Minute                         10 Minutes                    30 Minute




                                            Stormwater Management Report                                   12
S19-007                                       122 & 144 Myall St, Cooroy