Site and Soil Evaluation

The size of the Land Application Area is calculated as follows: Main House

  Minimum requirement       q          120         litres per person per day        AS 1547 –2012 Appendix H1

      Water Supply                  Tank Water

  Number of persons =                   8                                               AS 1547 Table J1


      Total Volume          Q=        6720        L/week

      Soil Category                     5                                               AS 1547 Table M1

 Indicative permeability            0.06-0.12                                           AS 1547 Table M1

          DIR                          21         mm/week                               AS 1547 Table M1

      Disposal Area         A=         320        m2


The size of the Land Application Area is calculated as follows: Cottage

  Minimum requirement           q        120            litres per person per day      AS 1547 –2012 Appendix H1

      Water Supply                   Tank Water

  Number of persons =                       10                                              AS 1547 Table J1


      Total Volume          Q=          8400        L/week

      Soil Category                         5                                               AS 1547 Table M1

  Indicative permeability             0.06-0.12                                             AS 1547 Table M1

           DIR                              21      mm/week                                 AS 1547 Table M1

                                                       2
      Disposal Area         A=           400        m




WE RECOMMEND THAT A MINIMUM LAND APPLICATION AREA OF 320m2 BE PROVIDED for the Main
dwelling and 400m2 for the workers cottage.

The Irrigation System should be designed in accordance with AS 1547–2012 and comply with all relevant statutory
requirements.


Construction Guidelines for Land Application Areas:

Sub-Surface Drip Irrigation

Consists of a reticulated pressurised irrigation system that uses an arrangement of equally spaced shallow sub-
surface drains to equally distribute the treated effluent across the Land Application Area. This system allows
vegetation within the area to directly benefit from such watering which also assists in disposal of the effluent via
evapo-transpiration. The drains can consist of small diameter poly piping that has pre-drilled holes for drainage of
the effluent. These pipe must be contained within another Agg drain with a geofabric wrapping that inhibits root
growth which could block the system. Other types of drains include pressure compensated dripper lines. A
number of different manufactured systems exist. Points to consider in the construction of the area include the
following:



   AUSTRALIAN SOIL INVESTIGATIONS                                        5                                      ASI Ref: 220144(A)