1890 Effluent Disposal Review · MCU20/0022

      Recommended horizontal separation distances for protection of water quality

                                                                                   Recommended
                                          Feature
                                                                                Horizontal Separation
          •   Top of bank of permanent water course;                                  Distance
          •   Top of bank of Intermittent water course;
                                                                                “Modified” Advanced
          •   Top of bank of a lake;
                                                                                Secondary effluent: 10 metres
          •   Top water level of a surface water source used for agriculture,
                                                                                (horizontal)
              aquaculture or stock purposes;
          • Easement boundary of unlined open stormwater drainage
            channel or drain.

                                                                                “Modified” Advanced
          Bore or a dam used or likely to be used for human and/or
                                                                                Secondary effluent: 10 metres
          domestic consumption.
                                                                                (horizontal)
                                                                                “Modified” Advanced
          Unsaturated soil depth to a permanent water table.                    Secondary effluent: 0.3
                                                                                metres (vertical)
          Notes:
          The separation distances are recommended and the local government may upon considering the
          public health and environmental risks reduce or increase the distances given.




4     Design Consideration
4.1   Design Parameters (Residence)

             The “design” soil category is based on 5 – light clay.
             The inferred design-loading rate (DIR) for these soil types is 3mm/day
             Wastewater flow allowance for the residence is 120 litres/person/day
             For a five-bedroom residence, we have allowed for 7 persons
             A spa bath is not proposed

              Total loading = 840 litres/day


4.2   Calculated Irrigation Area
      For a design irrigation rate (DIR) of 3mm /day, this results in an irrigation area of
      280m2.


4.3   Noosa Council require a minimum 9 fixed sprinklers per 100m² of effluent application
      area. We propose twenty-five (25) fixed sprinklers.


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