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Technology in Drainage

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					Docklands Park

                     Subsoil Drainage



                 • Karen Hannan
                 • Anton Peiris
                 • Luke Sandri
Docklands Park

                                 Project Goals

                 • Ultimate goal of project
                    – Design and Implement Subsoil Drainage
                      System
                       • Prevent over saturation of soil
                       • Prevent rise in the water table
                       • Reduce mains water requirements
                 • Relationship to other projects
                    – Complementary to storm water drainage
                      system
                    – Ensures adequate drainage around bike
                      path
                    – Drains into wetlands
Docklands Park

                               Challenges



                 •   Contaminated ground water
                 •   Contaminated soil
                 •   Coping with heavy rain
                 •   Maximising efficiency
Docklands Park

                               Description

                 •   Underground drainage system
                 •   Slotted drainpipes
                 •   Water seeps from soil into drainpipes
                 •   Drains gravity feed to pits/wetlands

                                               Typical subsoil
                                               drainage cross
                                               section
Docklands Park

                                  Technology


                 • Standards being adopted
                   – All relevant current SAA standards
                   – Local statutory authority standards
                   – eg.
                      • AS2439.1 Perforated drainage pipe
                      • AS1657 Step iron requirements in pits
                      • EP408.2 Reuse of water from surface runoff
Docklands Park

                            Existing System


                 • Subsoil drains are approx. 200mm
                   wide;
                 • Subsoil drains are 500-1000mm below
                   the surface;
                 • Textile membrane to line drain
                 • Drains will be located at the bottom of
                   slopes;
                 • Water will be gravity fed through pipes
                   to pits and then to wetlands.
Docklands Park
                     Technical Specifications-
                         Existing System

            •    100mm diameter slotted polyethylene pipe
            •    4-7mm aggregate, no fines
            •    95% compacted sand
            •    SL92 Fabric for Pit liner
            •    Terram 1000 textile membrane drain liner
            •    Grated and solid pit covers, varying sizes
Docklands Park

                          Proposed System


                 • Subsoil drains are approx. 100mm
                   wide;
                 • Subsoil drains are 500-1000mm below
                   the surface;
                 • Drains will be located at the bottom of
                   slopes;
                 • Water will be gravity fed through pipes
                   to pits and then to wetlands.
Docklands Park
                  Technical Specifications-
                     Proposed System

           • Megaflow pipe (Manufactured by Geofabrics
             Australia)
           • 4-7mm aggregate, no fines
           • 95% compacted sand
           • SL92 Fabric for Pit Liner
           • Polypropylene Pits 225mmx225mm
           • Glass Fibre Reinforced Concrete Pits (Various
             sizes)

				
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