20210153 - Maple Street SWMP

                      Table 3.2 Existing and proposed mitigated site peak discharge rates

                                                                  Maple Street
                                                                                             Qchange
                                 A.E.P                Qexisting      Qmitigated   Qchange     (%)
                                                      (m³/s)         (m³/s)       (m³/s)
                                   1EY                 0.045          0.038       -0.007      -16%
                                  50%                  0.054          0.045       -0.009      -17%
                                 0.2 EY                0.103           0.09       -0.013      -13%
                                  10%                  0.129          0.116       -0.013      -10%
                                   5%                  0.159           0.14       -0.019      -12%
                                   2%                  0.196          0.167       -0.029      -15%
                                   1%                  0.215          0.184       -0.031      -14%



As the total peak flows are equal to or below the existing site conditions, the proposed OSD area will
provide the mitigation required for the peak flow storm events from the development.

The stormwater pit on Myall Street is proposed as the lawful point of discharge for the development.
As the existing site run-off drains towards Myall Street and is conveyed through the kerb and channel
to the existing kerb inlet pit in Myall Street, the stormwater system capacity of this drainage network
is not considered to be worsened by the development. Peak flows from all storm events are reduced
through the implementation of the stormwater attenuation measures, therefore the proposed
stormwater discharge will reduce the demand on the downstream network.




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Project number 20210153
File RECOR Preliminary Stormwater Management Report - 20210153.docx, 2022-03-31                                     Page 12 of 26
Revision 0

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