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The Munno Para West, Andrews Farm, and Andrews Farm South wetland system are all proposed to operate by gravity. The wetland systems are being planned as part of an urban regeneration program and will also add value to the landscape of the area while producing treated stormwater. To asses ASR potential recent hydrogeological investigations, including drilling, well discharge testing and modelling has demonstrated that:
 

  • the T2 aquifer is homogeneous, with consistent properties
  • the injection capacity per well is expected to range between 20-25L/s.
  • Well connected aquifers showing high transmissivity.

Analytical modelling, taking into account well interference, continuous injection at 25L/s/well over 70
days (conservative), indicates an impress up to approximately 50m above ground level for the schemes with treatment rate less than 100L/s. This results in the system being well suited for storage of treated stormwater, as has been confirmed by numerical modelling.
SMITH CREEKCAPTURE AND TREATMENTSTORAGE
Scheme
 Buffer
storage 		Diversion
pump 		Wetland
size 		Bioretention
size 		Treatment
rate 		Total
treated 		Injection
rate 		ASR wells
 Surface
storage 		Comment
MLL/shahaL/sML/yearL/sWellsML
Andrews Farm 3.2 64 400 20-25 3
Andrews Farm South 2.8 56 500 20-25 3
Blakeview 2 40 308 20-25 2
Evanston South 1.5 44 185 10 5
Munno Para West 7 90 1241 20-25 5
NEXY retarding Basin 2 200 854 20-25 10
Total 3488 28 0