Development Application part 7 of 10 Stormwater Management Report - MCU13/0092

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Based on the outputs from DRAINS for Pre development, Post development and Mitigated Flow, the basin are shown
to adequately mitigate post development flows at the site outlet for all cases.


                                 Table 2: Detention Basin 1 Flow Mitigation Table


Event Frequency (years)        Predevelopment Flows           Post Development Flows         Mitigated Flows
                                     (DRAINS)                        (DRAINS)                   (DRAINS)
             1                         0.031 m3/s                    0.081 m3/s                  0.030 m3/s
             2                         0.050 m3/s                    0.104 m3/s                 0.036 m3/s
            10                         0.082 m3/s                    0.144 m3/s                 0.046 m3/s
            50                         0.120 m3/s                    0.187 m3/s                 0.091 m3/s
            100                        0.136 m3/s                    0.207 m3/s                 0.136 m3/s


Inflow/Outflow and Storage data for worst case durations for each event modeled have been included in Appendix D.


                                    Table 3: Detention Basin 2 Flow Mitigation Table


Event Frequency (years)        Predevelopment Flows          Post Development Flows          Mitigated Flows
                                     (DRAINS)                        (DRAINS)                   (DRAINS)
             1                        0.036 m3/s                     0.093 m3/s                 0.036 m3/s
             2                        0.058 m3/s                     0.120 m3/s                 0.044 m3/s
            10                        0.095 m3/s                     0.167 m3/s                 0.055 m3/s
            50                        0.139 m3/s                     0.217 m3/s                 0.097 m3/s
           100                        0.158 m3/s                     0.240 m3/s                 0.154 m3/s


Inflow/Outflow and Storage data for worst case durations for each event modeled have been included in Appendix D.




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