Site Based Stormwater Management Plan

Part 2: Construction phase – stormwater management design objectives for temporary drainage works




                                                                                                                                        Part G
Temporary drainage works                                                     Anticipated operation design life and
                                                                                 minimum design storm event
                                                             < 12 months           12–24 months               > 24 months




                                                                                                                                         Appendices
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 occupied                                  1 in 10 year ARI/10% AEP
property that would be adversely affected by the
failure or overtopping of the structure

Culvert crossing                                                                    1 in 1 year ARI/63% AEP



Part 3: Construction phase – stormwater management design objectives for emergency spillways on
temporary sediment basins

Drainage structure                                                           Anticipated operation design life and
                                                                                 minimum design storm event
                                                             < 3 months            3–12 months                > 12 months

Emergency spillways on temporary sediment basins              1 in 10 year           1 in 20 year             1 in 50 year
                                                             ARI/10% AEP             ARI/5% AEP               ARI/2% AEP


Note: Refer to IECA 2008 Best Practice Erosion and Sediment Control (as amended) for details on the application of the
Construction Phase requirements. Advice should be obtained from a suitably qualified person e.g. Certified Practitioner in
Erosion and Sediment Control, or Registered Professional Engineer Queensland, with appropriate knowledge and experience
in erosion and sediment control design and implementation.




                                                                                                        State Planning Policy page 81