Attachment E - Stormwater Management Report · MCU24/0112

           Issue              Desired Outcomes



                                 hydrological effectiveness) to 50mg/L Total Suspended Solids (TSS) or
                                 less, and pH in the range (6.5–8.5).

 Litter, Hydrocarbons and     1. Remove gross pollutants and litter.
 other contaminants
                              2. Avoid the release of oil or visible sheen to released waters.

                              3. Dispose of waste containing contaminants at authorised facilities.

 Waterway Stability and       1. Where measures are required to meet post-construction waterway
 flood flow management           stability objectives, these are either installed prior to land disturbance
                                 and are integrated with erosion and sediment controls, or equivalent
                                 alternative measures are implemented during construction.
                              2. Earthworks and the implementation of erosion and sediment controls
                                 are undertaken in ways which ensure flooding characteristics
                                 (including stormwater quantity characteristics) external to the
                                 development site are not worsened during construction for all events up
                                 to and including the 1 in 100 year ARI (1% AEP).


Table 5 – SPP Appendix 2: Part 2 Construction Phase – Stormwater Management Design Objectives
for Temporary Drainage Works

 Temporary Drainage Works                         Anticipated Operation Design Life and Minimum
                                                               Design Storm Event


                                                  <12 Months          12-24 Months         >24 Months

 Drainage Structure                               1 in 2 year          1 in 5 year         1 in 10 year
                                                 ARI/39% AEP          ARI/18% AEP         ARI/10% AEP

 Where located immediately up-slope of an                      1 in 10 year ARI/10% AEP
 occupied property that would be adversely
 affected by the failure or overtopping of the
 structure

 Culvert Crossing                                               1 in 1 year ARI/63% AEP




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