Guidelines for constructing and maintaining aquaculture ...

Contents
Using these guidelines ................................................................................................................... 3
1. Introduction ............................................................................................................................ 4
1.1 Background .................................................................................................................. 4
1.2 Purpose ....................................................................................................................... 5
1.3 Scope .......................................................................................................................... 5
2. Site related factors to consider in risk assessment ................................................................... 6
2.1 Topography .................................................................................................................. 6
2.2 Geology ....................................................................................................................... 6
2.3 Soils ............................................................................................................................ 6
2.4 Groundwater ................................................................................................................ 6
2.5 Acid sulfate soils .......................................................................................................... 7
2.6 Sensitive environments ................................................................................................ 7
2.7 Local and regional land use .......................................................................................... 8
2.8 Separation distances ................................................................................................... 8
3. Risk assessment ...................................................................................................................... 9
3.1 Risk assessment framework ......................................................................................... 9
3.2 Undertaking the risk assessment.................................................................................10
3.3 Applying the outcomes of the risk assessment ............................................................ 11
4. Detailed site investigation ......................................................................................................12
4.1 Site topographic survey ...............................................................................................12
4.2 Site geology ................................................................................................................12
4.3 Site soil survey ............................................................................................................12
4.3.1 Purpose ................................................................................................................12
4.3.2 Minimum soil testing requirements .......................................................................12
4.3.3 Soil classification ..................................................................................................13
4.4 Groundwater survey ....................................................................................................13
4.5 Site assessment report................................................................................................14
5. Design ..................................................................................................................................15
5.1 Farm layout .................................................................................................................15
5.2 Containment structures ...............................................................................................15
5.2.1 Foundations ..........................................................................................................15
5.2.2 Embankments.......................................................................................................16
5.2.3 Freeboard .............................................................................................................17
5.2.4 Inlet/outlet works .................................................................................................17
5.3 Intake and discharge points ........................................................................................17
5.4 Buffer zones ................................................................................................................17
5.5 Engineering plans and drawings ..................................................................................18
6. Construction ...........................................................................................................................19
6.1 Notification .................................................................................................................19
6.2 Site preparation ..........................................................................................................19
6.3 Material suitability ......................................................................................................19
6.4 Placement of material .................................................................................................19
6.4.1 Earth material lining ..............................................................................................19
6.4.2 Embankments...................................................................................................... 20
6.4.3 Erosion control ..................................................................................................... 20
6.4.4 Pipes, culverts and weirs ..................................................................................... 20
6.5 Correct moisture content ............................................................................................ 20
6.6 Compaction ............................................................................................................... 20
6.7 Documentation ...........................................................................................................21
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