Attachment 3 - Stormwater Management Plan 1856-SBSMP-01 v5 (December 2019) · RAL18/0023

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

 

 

Temporary drainage works PM ee CC Cem LC!
PEL
Cer Mrs PPro meld ey murs
>
Drainage structure 1in 2 year 1in5 year 1in 10 year 3
ARI/39% AEP ARI/18% AEP ARI/10% AEP 2
Where located immediately up-slope of an occupied 1in10 year ARI/10% AEP &

property that would be adversely affected by the
failure or overtopping of the structure

 

Culvert crossing 1in 1 year ARI/63% AEP

 

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

 

Drainage structure PM el CC Cem LC!
PU ne
Re Puc is cer PMC PPP MUO ry
Emergency spillways on temporary sediment basins 1in 10 year 1in 20 year 1in 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